CN112034396A - Method for determining turn-to-turn fault protection of series transformer by using voltage and current - Google Patents

Method for determining turn-to-turn fault protection of series transformer by using voltage and current Download PDF

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Publication number
CN112034396A
CN112034396A CN202010692266.2A CN202010692266A CN112034396A CN 112034396 A CN112034396 A CN 112034396A CN 202010692266 A CN202010692266 A CN 202010692266A CN 112034396 A CN112034396 A CN 112034396A
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turn
criterion
current
series transformer
fault
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CN112034396B (en
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曹虹
李天华
周泽昕
王兴国
杜丁香
吕鹏飞
刘宇
阮思烨
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shandong Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/72—Testing of electric windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The application discloses a series transformer turn-to-turn fault protection method utilizing voltage and current. Wherein, the method comprises the following steps: determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer; determining a logical relation of turn-to-turn fault identification criteria; determining the logic relation of the fault positioning criterion at the network valve side; and determining the category of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault location, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the category of the turn-to-turn faults of the series transformer, wherein the category of the turn-to-turn faults of the series transformer is divided into network side turn-to-turn faults and valve side turn-to-turn faults.

Description

Method for determining turn-to-turn fault protection of series transformer by using voltage and current
Technical Field
The present application relates to power systems, and more particularly to a method for determining turn-to-turn fault protection for a series transformer using voltage and current.
Background
With the saturation of power transmission corridors of power systems, it is more and more difficult to increase transmission capacity by building new power transmission lines, and the requirements of a large-scale interconnection network for improving the transmission power of a power grid, reducing loss and the like become difficult problems which need to be solved urgently. The Unified Power Flow Controller (UPFC) is a new generation flexible alternating current transmission equipment with the most comprehensive functions so far, can respectively or simultaneously realize multiple basic functions such as parallel compensation, series compensation, phase shift, terminal voltage regulation and the like, and has obvious technical advantages and wide application prospect in practical engineering.
The series transformer is an important component of a UPFC system, a valve side winding of the series transformer is connected with a converter valve, a grid side winding of the series transformer is directly connected into a power transmission line in series, and voltage vectors with controllable amplitude values and phase angles are injected into the power transmission line, so that a power regulation function is realized. The particularity of the operation mode of the series transformer determines that the structure and the characteristics of the series transformer are greatly different from those of the traditional transformer.
The sensitivity of the traditional transformer protection is insufficient when the turn-to-turn fault of the winding of the series transformer occurs, and in order to quickly isolate the turn-to-turn fault of the winding, avoid the fault development and damage to the winding and ensure the safe operation of the series transformer, the turn-to-turn fault protection of the winding must be configured for supplement. At present, a series transformer is configured with longitudinal differential protection to isolate turn-to-turn faults, and when the sum of the phasor of a network side current and a valve side current converted to the network side is greater than a starting threshold and meets the action characteristic, the protection immediately acts an outlet, and switches on the network side and the valve side of the series transformer are closed. But when a small turn-to-turn fault occurs, the longitudinal differential protection refuses to act. The turn-to-turn fault protection of the winding belongs to main protection, and when the turn-to-turn fault of the winding is small, the turn-to-turn fault protection can accurately and quickly act, so that the sensitivity is good. Therefore, how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage to a winding and ensure safe operation of the series transformer becomes necessary.
Aiming at the technical problem that how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage of a winding and ensure safe operation of the series transformer in the prior art is necessary, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the disclosure provides a series transformer turn-to-turn fault protection method using voltage and current, so as to solve at least a technical problem that how to quickly determine the turn-to-turn fault protection of a series transformer in the prior art, avoid the fault development from damaging a winding and ensure the safe operation of the series transformer becomes necessary.
According to an aspect of the embodiments of the present disclosure, there is provided a method for determining turn-to-turn fault protection of a series transformer by using voltage and current, including: determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer; determining a logical relationship of turn-to-turn fault identification criteria according to a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion and a second balanced winding circulating current criterion; determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
According to another aspect of the embodiments of the present disclosure, there is also provided a storage medium including a stored program, wherein the method of any one of the above is performed by a processor when the program is executed.
According to another aspect of the embodiments of the present disclosure, there is also provided an apparatus for turn-to-turn fault protection of a series transformer, including: the determination criterion module is used for determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer; the device comprises a first logic relation determining module, a second logic relation determining module and a fault judging module, wherein the first logic relation determining module is used for determining the logic relation of turn-to-turn fault identification criteria according to a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion and a second balanced winding circulating current criterion; the second logic relation determining module is used for determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and the judging module is used for judging the category of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the category of the turn-to-turn faults of the series transformer, wherein the category of the turn-to-turn faults of the series transformer is divided into network side turn-to-turn faults and valve side turn-to-turn faults.
According to another aspect of the embodiments of the present disclosure, there is also provided an apparatus for turn-to-turn fault protection of a series transformer, including: a processor; and a memory coupled to the processor for providing instructions to the processor for processing the following processing steps: determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer; determining a logical relationship of turn-to-turn fault identification criteria according to a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion and a second balanced winding circulating current criterion; determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
In the embodiment of the disclosure, according to pre-collected parameters of inter-turn faults of the series transformer, a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion are determined, and a logical relationship of inter-turn fault identification criteria and a logical relationship of network valve side fault positioning criteria are determined. And finally, judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Therefore, turn-to-turn faults of the series transformer are identified, and reliable protection actions of the turn-to-turn faults of the series transformer are determined according to the specific faults of the turn-to-turn faults of the series transformer. Therefore, the problem of insufficient sensitivity during turn-to-turn faults of the windings of the series transformer is solved, and the safe operation of the series transformer is ensured. Therefore, the technical problem that how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage of a winding and ensure safe operation of the series transformer in the prior art is necessary is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 is a hardware block diagram of a computing device for implementing the method according to embodiment 1 of the present disclosure;
fig. 2 is a schematic flow chart of a method for determining turn-to-turn fault protection of a series transformer by using voltage and current according to a first aspect of embodiment 1 of the present disclosure;
fig. 3 is a circuit diagram of series transformer turn-to-turn fault protection according to a first aspect of an embodiment of the present disclosure;
fig. 4 is a block diagram of a UPFC series transformer according to a first aspect of an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an apparatus for determining turn-to-turn fault protection of a series transformer using voltage and current according to embodiment 2 of the present disclosure; and
fig. 6 is a schematic diagram of an apparatus for determining turn-to-turn fault protection of a series transformer by using voltage and current according to embodiment 3 of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. It is to be understood that the described embodiments are merely exemplary of some, and not all, of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the disclosure described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
According to the present embodiment, there is also provided an embodiment of a method for determining turn-to-turn fault protection of a series transformer using voltage and current, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
The method embodiments provided by the present embodiment may be executed in a server or similar computing device. Fig. 1 illustrates a hardware block diagram of a computing device for implementing a method for determining series transformer turn-to-turn fault protection using voltage current. As shown in fig. 1, the computing device may include one or more processors (which may include, but are not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory for storing data, and a transmission device for communication functions. Besides, the method can also comprise the following steps: a display, an input/output interface (I/O interface), a Universal Serial Bus (USB) port (which may be included as one of the ports of the I/O interface), a network interface, a power source, and/or a camera. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration and is not intended to limit the structure of the electronic device. For example, the computing device may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.
It should be noted that the one or more processors and/or other data processing circuitry described above may be referred to generally herein as "data processing circuitry". The data processing circuitry may be embodied in whole or in part in software, hardware, firmware, or any combination thereof. Further, the data processing circuitry may be a single, stand-alone processing module, or incorporated in whole or in part into any of the other elements in the computing device. As referred to in the disclosed embodiments, the data processing circuit acts as a processor control (e.g., selection of a variable resistance termination path connected to the interface).
The memory may be used to store software programs and modules of application software, such as program instructions/data storage devices corresponding to the method for determining turn-to-turn fault protection of a series transformer by using voltage and current in the embodiments of the present disclosure, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, implementing the method for determining turn-to-turn fault protection of a series transformer by using voltage and current of the application program. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory located remotely from the processor, which may be connected to the computing device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device is used for receiving or transmitting data via a network. Specific examples of such networks may include wireless networks provided by communication providers of the computing devices. In one example, the transmission device includes a Network adapter (NIC) that can be connected to other Network devices through a base station to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.
The display may be, for example, a touch screen type Liquid Crystal Display (LCD) that may enable a user to interact with a user interface of the computing device.
It should be noted here that in some alternative embodiments, the computing device shown in fig. 1 described above may include hardware elements (including circuitry), software elements (including computer code stored on a computer-readable medium), or a combination of both hardware and software elements. It should be noted that FIG. 1 is only one example of a particular specific example and is intended to illustrate the types of components that may be present in a computing device as described above.
According to a first aspect of the present embodiment, a method for determining turn-to-turn fault protection of a series transformer using voltage current is provided. Fig. 2 shows a flow diagram of the method, which, with reference to fig. 2, comprises:
s202: determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer;
s204: determining a logical relationship of turn-to-turn fault identification criteria according to a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion and a second balanced winding circulating current criterion;
s206: determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and
s208: judging the category of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the category of the turn-to-turn faults of the series transformer, wherein the categories of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Specifically, referring to fig. 3, in the present embodiment, first, a first start criterion, a second start criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion, and a zero-sequence voltage ratio criterion are determined according to pre-collected parameters of the inter-turn fault of the series transformer.
And further, determining the logic relation of turn-to-turn fault identification criteria according to the first starting criterion, the second starting criterion, the current auxiliary criterion, the longitudinal zero-sequence impedance criterion, the voltage auxiliary criterion, the harmonic ratio criterion, the first balanced winding circulating current criterion and the second balanced winding circulating current criterion. And determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion.
And finally, judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable action of turn-to-turn fault protection of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the reliability in the reliable action represents the reliability, the action represents that the logic relationship is 1, the action is opposite to the non-action, and the non-action represents that the logic relationship is 0. The classification of the turn-to-turn fault of the series transformer is divided into a network side turn-to-turn fault and a valve side turn-to-turn fault.
Referring to fig. 4, the grid side, valve side and balance windings of the series transformer are respectively in type III, Y and delta connections. A grid side winding of the series transformer is connected in series with the head end of the line PN; the valve side winding is directly connected with the series converter, and a neutral point of the valve side winding is grounded through a large resistor R; the balance winding is unloaded.
Figure BDA0002589714820000071
Is the line equivalent impedance. QF1 and QF3 respectively denote circuit breakers on both sides of the line PN. QF2, QF4 are series transformer net-side winding and valve-side winding bypass breakers, respectively. TA1 and TA2 are current transformers. TV1, TV2, and TV3 are voltage transformers. The method comprises the following specific steps:
(1) firstly, three-phase voltage sampling values of voltage transformers TV1, TV2 and TV3 and three-phase current sampling values of current transformers TA1 and TA2 are collected, and sampling values of voltage grounding of valve side windings of TV3 are taken as uvA、uvB、uvCCalculation of the sampled value u of the voltage to ground on the grid side winding of TV1, taken from TV1HA、uHB、uHCAnd calculating a voltage sampling value u of the other end of the grid side winding of the TV2 to the ground voltageEA、uEB、uECCalculating effective value of net side current fundamental wave phasor of TA1
Figure BDA0002589714820000072
Calculating fundamental phasor of voltage at one end of grid side winding of TV1 to earth voltage
Figure BDA0002589714820000073
Calculating fundamental phasor of voltage at the other end of grid side winding of TV2 to ground voltage
Figure BDA0002589714820000074
The sampled value of the balanced winding current taken from TA2 is itCalculating the amplitude I of the DC component of the balanced winding current of TA2tdcCalculating fundamental component of current of balance winding
Figure BDA0002589714820000075
Calculating fundamental component of zero-sequence current of balance winding
Figure BDA0002589714820000076
(2) Comparison itAnd istart0If i ist＞istart0If so, meeting the first starting criterion and entering the step (4); otherwise, go to step (3).
(3) If uHA-uEA+uHB-uEB+uHC-uEC＞ustartIf so, meeting a second starting criterion and entering the step (4); otherwise, the protection returns.
(4) Compare separately
Figure BDA0002589714820000077
And IsetSize of (1), if
Figure BDA0002589714820000078
If the current amplitude criterion is met, entering the step (5); otherwise, the protection returns.
(5) Computing
Figure BDA0002589714820000079
If it is
Figure BDA00025897148200000710
The longitudinal zero sequence impedance criterion is met, and the step (6) is carried out; otherwise, the protection returns.
(6) Computing
Figure BDA0002589714820000081
If it is
Figure BDA0002589714820000082
If the voltage auxiliary criterion is met, entering the step (8); otherwise, go to step (7).
(7) Computing
Figure BDA0002589714820000083
If it is
Figure BDA0002589714820000084
If the harmonic ratio criterion is met, entering the step (8); otherwise, the protection returns.
(8) Computing
Figure BDA0002589714820000085
If it is
Figure BDA0002589714820000086
The first balance winding circulation criterion is met, and an outlet is protected; otherwise, go to step (9).
(9) Computing
Figure BDA0002589714820000087
If it is
Figure BDA0002589714820000088
If the second balance winding circulation criterion is met, entering the step (10); otherwise, the protection returns.
(10) Computing
Figure BDA0002589714820000089
If it is
Figure BDA00025897148200000810
Then the zero sequence current ratio criterion is met, and the network side inter-turn fault is judged; otherwise, go to step (11).
(11) If it is
Figure BDA00025897148200000811
Meeting the harmonic ratio criterion and judging the fault as a network side turn-to-turn fault; otherwise step (12) is entered.
(12) Computing
Figure BDA00025897148200000812
If it is
Figure BDA00025897148200000813
Then the zero sequence voltage ratio criterion is met, and the network side turn-to-turn fault is judged; otherwise, it is judged as valve side interturn faultAnd (4) a barrier.
Therefore, when a metallic grounding fault occurs on the network side, the current auxiliary criterion is reliable and does not act, the turn-to-turn fault protection identification criterion is reliable and does not act wrongly, and the whole protection scheme is reliable and does not act wrongly. When a high-resistance grounding fault occurs on the network side, the longitudinal zero-sequence impedance criterion is reliable and does not act, the turn-to-turn fault protection identification criterion is reliable and does not act wrongly, and the whole protection scheme is reliable and does not act wrongly. When the valve side lead has short-circuit fault, the voltage auxiliary criterion and the harmonic ratio criterion are reliable and do not act, the turn-to-turn fault protection identification criterion is reliable and does not act wrongly, and the whole protection scheme is reliable and does not act wrongly. When a single-pole or double-pole ground fault occurs on the valve side direct current lead, the first balance winding circulation criterion and the second balance winding circulation criterion are reliable and do not act, the turn-to-turn fault protection identification criterion is reliable and does not act wrongly, and the whole protection scheme is reliable and does not act wrongly. When the inter-turn fault occurs on the network side, the inter-turn fault protection identification criterion reliably acts, and at least one of the zero-sequence current ratio criterion, the harmonic ratio criterion and the zero-sequence voltage ratio criterion is satisfied, so that the inter-turn fault on the network side is reliably judged. When the turn-to-turn fault occurs on the valve side, the turn-to-turn fault protection identification criterion reliably acts, and the zero-sequence current ratio criterion, the harmonic ratio criterion and the zero-sequence voltage ratio criterion are not satisfied and are reliably judged as the turn-to-turn fault on the valve side.
Therefore, in this embodiment, according to the pre-collected parameters of the turn-to-turn fault of the series transformer, a first start criterion, a second start criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion, and a zero-sequence voltage ratio criterion are determined, and a logical relationship of the turn-to-turn fault identification criterion and a logical relationship of the network valve side fault positioning criterion are determined. And finally, judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Therefore, turn-to-turn faults of the series transformer are identified, and reliable protection actions of the turn-to-turn faults of the series transformer are determined according to the specific faults of the turn-to-turn faults of the series transformer. Therefore, the problem of insufficient sensitivity during turn-to-turn faults of the windings of the series transformer is solved, and the safe operation of the series transformer is ensured. Therefore, the technical problem that how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage of a winding and ensure safe operation of the series transformer in the prior art is necessary is solved.
Optionally, the operation of determining the first start criterion and the second start criterion according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, determining a first starting criterion as it＞istart0Wherein i istTo balance the winding current sample values, istart0Starting a constant value for the current; and determining a second starting criterion as u according to pre-acquired parameters of turn-to-turn faults of the series transformerHA-uEA+uHB-uEB+uHC-uEC＞ustartWherein u isHASampling value u of voltage to ground at one end of A-phase network side windingEASampling value u of the other end of the A-phase network side winding to the ground voltageHBSampling a voltage to ground voltage value u of one end of a B-phase network side windingEBSampling value u of the other end of the B-phase network side winding to the ground voltageHCSampling value u of voltage to ground at one end of C-phase network side windingECSampling value u for the other end of the C-phase network side winding to the ground voltagestartA fixed value is initiated for the voltage.
Specifically, according to pre-collected parameters of turn-to-turn faults of the series transformer, a first starting criterion is determined to be it＞istart0Wherein i istTo balance the winding current sample values, istart0Starting a constant value for the current; and determining a second starting criterion as u according to pre-acquired parameters of turn-to-turn faults of the series transformerHA-uEA+uHB-uEB+uHC-uEC＞ustartWherein, I "0setFor third zero-sequence circulating current, I "tsetAnd the third harmonic ratio is fixed. Alpha is a fixed value of the zero sequence voltage ratio.
Figure BDA0002589714820000091
For the zero sequence voltage difference on the network side,
Figure BDA0002589714820000092
fundamental phasor for voltage to ground at one end of the a-phase grid side winding, taken from TV1 in fig. 4,
Figure BDA0002589714820000093
obtaining a fundamental phasor of the voltage at the other end of the A-phase network side winding to the ground voltage from a TV2 in the graph of FIG. 4;
Figure BDA0002589714820000101
fundamental phasor for voltage to ground at one end of the B-phase grid side winding, taken from TV1 in fig. 4,
Figure BDA0002589714820000102
obtaining a fundamental phasor of the voltage at the other end of the winding on the side of the B-phase network to the ground voltage from a TV2 in the diagram of FIG. 4;
Figure BDA0002589714820000103
fundamental phasor to ground voltage at one end of the C-phase grid side winding, taken from TV1 in fig. 4,
Figure BDA0002589714820000104
the fundamental phasor for the other end of the C-phase grid side winding to ground voltage is obtained from TV2 in fig. 4. 3 delta U0MAXAnd the maximum value of the zero sequence voltage difference of the network side in the N sampling points is obtained. Thereby determining a first start criterion and a second start criterion.
Optionally, the operation of determining the current auxiliary criterion and the voltage auxiliary criterion according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, the current auxiliary criterion is determined as
Figure BDA0002589714820000105
Wherein the content of the first and second substances,
Figure BDA0002589714820000106
is the effective value of the fundamental wave phasor of the A-phase network side current,
Figure BDA0002589714820000107
the effective value of the current fundamental wave phasor at the side of the B-phase network,
Figure BDA0002589714820000108
is the effective value of the C-phase network side current fundamental wave phasor, IsetThe current auxiliary constant value is set; and determining the auxiliary voltage criterion as
Figure BDA0002589714820000109
Wherein u isvASampling value u of the ground voltage for A-phase valve side winding setvBSampling value u of ground voltage for B-phase valve side winding setvCAnd N is a first number for the sampling value of the ground voltage of the C-phase valve side winding set.
Specifically, according to the pre-collected parameters of turn-to-turn faults of the series transformer, the current auxiliary criterion is determined to be
Figure BDA00025897148200001010
Wherein the content of the first and second substances,
Figure BDA00025897148200001011
is the effective value of the fundamental wave phasor of the A-phase network side current,
Figure BDA00025897148200001012
the effective value of the current fundamental wave phasor at the side of the B-phase network,
Figure BDA00025897148200001013
the effective value of the current fundamental wave phasor at the C-phase network side; these three currents are obtained from TA1 of fig. 4. I issetThe current is assisted in setting. And determining the auxiliary voltage criterion as
Figure BDA00025897148200001014
Wherein u isvASampling value u of the ground voltage for A-phase valve side winding setvBSampling value u of ground voltage for B-phase valve side winding setvCThese three voltages are taken from TV3 of fig. 4 for the C-phase valve side winding to ground voltage samples. u. ofsetIs a voltage auxiliary constant value. N is a first number. Thereby determining a current assist criterion as well as a voltage assist criterion.
Optionally, the operation of determining the longitudinal zero-sequence impedance criterion and the harmonic ratio according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, the longitudinal zero-sequence impedance criterion is determined to be
Figure BDA00025897148200001015
Wherein Z issetSetting the impedance value; and determining the harmonic ratio criterion as
Figure BDA00025897148200001016
Wherein, I'0setIs a second zero sequence circulating current definite value, I'tsetThe second harmonic ratio is fixed.
Specifically, according to the pre-collected parameters of turn-to-turn faults of the series transformer, the longitudinal zero-sequence impedance criterion is determined to be
Figure BDA0002589714820000111
Wherein Z issetSetting the impedance value; and determining the harmonic ratio criterion as
Figure BDA0002589714820000112
Wherein, I'0setIs a second zero sequence circulating current definite value, I'tsetThe second harmonic ratio is fixed. Thereby determining the longitudinal zero sequence impedance criterion and the harmonic ratio.
Optionally, the first balance winding circulating current criterion and the second balance winding circulating current criterion are determined according to pre-collected parameters of turn-to-turn faults of the series transformerThe operation of the constant winding circulating current criterion comprises the following steps: according to the pre-collected parameters of turn-to-turn faults of the series transformer, determining a first balance winding circulation criterion as
Figure BDA0002589714820000113
Wherein itset2For sampling the first circulating current by a constant value, Itset2At a first constant value of circulation, N1A first number; and determining a second balance winding circulation criterion as
Figure BDA0002589714820000114
Wherein, I'tset3Is a single constant value for the second circulation, Itset3Is the second loop flow fixed value.
Specifically, according to the pre-collected parameters of turn-to-turn faults of the series transformer, a first balance winding circulating current criterion is determined to be
Figure BDA0002589714820000115
Wherein itset2For sampling the first circulating current by a constant value, ItsetAnd 2 is the first circulation setting. According to the pre-collected parameters of turn-to-turn faults of the series transformer, the second balance winding circulation criterion is determined as
Figure BDA0002589714820000116
Wherein, I'tset3Is a single constant value for the second circulation, Itset3Is the second loop flow fixed value. Thereby determining a first balance winding circulating current criterion and a second balance winding circulating current criterion.
Optionally, the operation of determining the zero-sequence current ratio criterion and the zero-sequence voltage ratio criterion according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, the zero-sequence current ratio criterion is determined as
Figure BDA0002589714820000117
Wherein the content of the first and second substances,
Figure BDA0002589714820000118
to balance the fundamental component of zero-sequence current of the winding, ItdcTo balance the magnitude of the dc component of the winding current,
Figure BDA0002589714820000119
to balance the fundamental component of the winding current, the balance winding current is taken from TA2,
Figure BDA00025897148200001110
for the fundamental component of the zero-sequence current of the grid-side winding, taken from TA1, I0setFor the first zero-sequence circulating current constant, ItsetIs a first harmonic ratio fixed value, and gamma is a zero-sequence current ratio fixed value; and determining zero sequence voltage ratio criterion as
Figure BDA00025897148200001111
Wherein, I "0setFor third zero-sequence circulating current, I "tsetIs a third harmonic ratio fixed value, alpha is a zero sequence voltage ratio fixed value,
Figure BDA00025897148200001112
for the zero sequence voltage difference on the network side,
Figure BDA00025897148200001113
one end of the A-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001114
the other end of the A-phase net side winding is connected with the ground voltage fundamental phasor,
Figure BDA00025897148200001115
one end of the B-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA0002589714820000121
the other end of the B-phase network side winding is connected with the ground voltage fundamental phasor,
Figure BDA0002589714820000122
is a C-phase network side winding oneThe fundamental phasor of the voltage to ground,
Figure BDA0002589714820000123
the other end of the side winding of the C-phase network is grounded voltage fundamental phasor, 3 delta U0MAXAnd the maximum value of the zero sequence voltage difference of the network side in the N sampling points is obtained.
Specifically, according to the pre-collected parameters of turn-to-turn faults of the series transformer, the zero-sequence current ratio criterion is determined as
Figure BDA0002589714820000124
Wherein the content of the first and second substances,
Figure BDA0002589714820000125
to balance the fundamental component of zero-sequence current of the winding, ItdcTo balance the magnitude of the dc component of the winding current,
Figure BDA0002589714820000126
to balance the fundamental component of the winding current, the balanced winding current is taken from TA 2.
Figure BDA0002589714820000127
The fundamental component of zero-sequence current of the grid-side winding is obtained from TA 1. I is0setFor the first zero-sequence circulating current constant, ItsetIs a first harmonic ratio fixed value, and gamma is a zero-sequence current ratio fixed value; and determining zero sequence voltage ratio criterion as
Figure BDA0002589714820000128
Wherein, I "0setFor third zero-sequence circulating current, I "tsetAnd the third harmonic ratio is fixed. Alpha is a fixed value of the zero sequence voltage ratio.
Figure BDA0002589714820000129
For the zero sequence voltage difference on the network side,
Figure BDA00025897148200001210
fundamental phasor for voltage to ground at one end of the a-phase grid side winding, taken from TV1 in fig. 4,
Figure BDA00025897148200001211
obtaining a fundamental phasor of the voltage at the other end of the A-phase network side winding to the ground voltage from a TV2 in the graph of FIG. 4;
Figure BDA00025897148200001212
fundamental phasor for voltage to ground at one end of the B-phase grid side winding, taken from TV1 in fig. 4,
Figure BDA00025897148200001213
obtaining a fundamental phasor of the voltage at the other end of the winding on the side of the B-phase network to the ground voltage from a TV2 in the diagram of FIG. 4;
Figure BDA00025897148200001214
fundamental phasor to ground voltage at one end of the C-phase grid side winding, taken from TV1 in fig. 4,
Figure BDA00025897148200001215
the fundamental phasor for the other end of the C-phase grid side winding to ground voltage is obtained from TV2 in fig. 4. 3 delta U0MAXAnd the maximum value of the zero sequence voltage difference of the network side in the N sampling points is obtained. Thus, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion are determined.
Optionally, determining a logical relationship of the turn-to-turn fault identification criterion according to a first start criterion, a second start criterion, a current assist criterion, a longitudinal zero-sequence impedance criterion, a voltage assist criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, and a second balanced winding circulating current criterion, includes: the voltage auxiliary criterion and the harmonic ratio criterion adopt a first OR gate logic; the first balanced winding circulation criterion and the second balanced winding circulation criterion adopt second OR gate logic; and determining turn-to-turn fault identification criteria by using gate logic results of the first OR gate logic and the second OR gate logic, the current auxiliary criteria, the longitudinal zero-sequence impedance criteria, the first starting criteria and the second starting criteria through AND gate logic.
Specifically, referring to FIG. 3, the voltage assist criterion and the harmonic ratio criterion employ first OR gate logic; the first balanced winding circulation criterion and the second balanced winding circulation criterion adopt second OR gate logic; and the gate logic results of the first OR gate logic and the second OR gate logic and the current auxiliary criterion, the longitudinal zero sequence impedance criterion, the first starting criterion and the second starting criterion are subjected to AND gate logic, so that turn-to-turn fault identification criterion is determined, and the type of turn-to-turn faults of the series transformer is judged subsequently.
Optionally, determining a logical relationship of the network valve side fault location criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion, and the zero sequence voltage ratio criterion includes: and determining the fault positioning criterion of the grid valve side by adopting OR gate logic according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion.
Specifically, referring to fig. 3, the zero-sequence current ratio criterion, the harmonic ratio criterion, and the zero-sequence voltage ratio criterion are implemented by using or gate logic, so as to determine a network valve side fault location criterion for subsequent determination of the inter-turn fault category of the series transformer.
Optionally, determining the category of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault location, including: under the condition that the turn-to-turn fault identification criterion and the network valve side fault positioning criterion pass through an AND gate logic outlet, judging that the turn-to-turn fault of the series transformer is a network side turn-to-turn fault; and after the network valve side fault positioning criterion is subjected to NOT gate logic, and then the network valve side fault positioning criterion and the turn-to-turn fault identification criterion are subjected to AND gate logic outlet, and the turn-to-turn fault of the series transformer is judged to be a valve side turn-to-turn fault.
Specifically, under the condition that the turn-to-turn fault identification criterion and the network valve side fault positioning criterion are exported through an AND gate logic, the turn-to-turn fault of the series transformer is judged to be a network side turn-to-turn fault; and after the network valve side fault positioning criterion is subjected to NOT gate logic, and then the network valve side fault positioning criterion and the turn-to-turn fault identification criterion are subjected to AND gate logic outlet, and the turn-to-turn fault of the series transformer is judged to be a valve side turn-to-turn fault. And determining whether the turn-to-turn fault of the series transformer is a network side turn-to-turn fault or a valve side turn-to-turn fault.
Further, referring to fig. 1, according to a second aspect of the present embodiment, there is provided a storage medium. The storage medium comprises a stored program, wherein the method of any of the above is performed by a processor when the program is run.
Thus, according to the present embodiment, according to the pre-collected parameters of the inter-turn fault of the series transformer, the first start criterion, the second start criterion, the current auxiliary criterion, the longitudinal zero-sequence impedance criterion, the voltage auxiliary criterion, the harmonic ratio criterion, the first balanced winding circulating current criterion, the second balanced winding circulating current criterion, the zero-sequence current ratio criterion, and the zero-sequence voltage ratio criterion are determined, and the logical relationship of the inter-turn fault identification criterion and the logical relationship of the network valve side fault location criterion are determined. And finally, judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Therefore, turn-to-turn faults of the series transformer are identified, and reliable protection actions of the turn-to-turn faults of the series transformer are determined according to the specific faults of the turn-to-turn faults of the series transformer. Therefore, the problem of insufficient sensitivity during turn-to-turn faults of the windings of the series transformer is solved, and the safe operation of the series transformer is ensured. Therefore, the technical problem that how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage of a winding and ensure safe operation of the series transformer in the prior art is necessary is solved.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the order of acts, as some steps may occur in other orders or concurrently in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 2
Fig. 5 shows an arrangement 500 for turn-to-turn fault protection of a series transformer according to the present embodiment, which arrangement 500 corresponds to the method according to the first aspect of embodiment 1. Referring to fig. 5, the apparatus 500 includes: a determination criterion module 510, configured to determine a first start criterion, a second start criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion, and a zero-sequence voltage ratio criterion according to pre-collected parameters of inter-turn faults of the series transformer; a determine first logical relationship module 520 for determining a logical relationship of the turn-to-turn fault identification criteria based on the first start criterion, the second start criterion, the current assist criterion, the longitudinal zero-sequence impedance criterion, the voltage assist criterion, the harmonic ratio criterion, the first balanced winding circulating current criterion, and the second balanced winding circulating current criterion; a determine second logical relationship module 530, configured to determine a logical relationship of the grid valve side fault location criterion according to the zero-sequence current ratio criterion, the harmonic ratio criterion, and the zero-sequence voltage ratio criterion; and the judging module 540 is configured to judge the category of the turn-to-turn fault of the series transformer according to the logic relationship of the turn-to-turn fault identification and the logic relationship of the network valve side fault location, and determine a reliable action of the turn-to-turn fault protection of the series transformer after judging the category of the turn-to-turn fault of the series transformer, where reliability in the reliable action indicates reliability, the action indicates logic of 1, and the category of the turn-to-turn fault of the series transformer is divided into a network side turn-to-turn fault and a valve side turn-to-turn fault.
Optionally, the determining criteria module 510 includes: a submodule for determining a first start criterion, configured to determine, according to a parameter of a pre-acquired turn-to-turn fault of the series transformer, that the first start criterion is it＞istart0Wherein i istTo balance the winding current sample values, istart0Starting a constant value for the current; and a submodule for determining a second start criterion, which is used for determining the second start criterion as u according to the pre-collected parameters of turn-to-turn faults of the series transformerHA-uEA+uHB-uEB+uHC-uEC＞ustartWherein u isHASampling value u of voltage to ground at one end of A-phase network side windingEASampling value u of the other end of the A-phase network side winding to the ground voltageHBSampling a voltage to ground voltage value u of one end of a B-phase network side windingEBSampling value u of the other end of the B-phase network side winding to the ground voltageHCSampling value u of voltage to ground at one end of C-phase network side windingECSampling value u for the other end of the C-phase network side winding to the ground voltagestartA fixed value is initiated for the voltage.
Optionally, the determining criteria module 510 includes: a current auxiliary criterion determining submodule for determining the current auxiliary criterion as
Figure BDA0002589714820000151
Wherein the content of the first and second substances,
Figure BDA0002589714820000152
is the effective value of the fundamental wave phasor of the A-phase network side current,
Figure BDA0002589714820000153
the effective value of the current fundamental wave phasor at the side of the B-phase network,
Figure BDA0002589714820000154
is the effective value of the C-phase network side current fundamental wave phasor, IsetThe current auxiliary constant value is set; and determining a voltage assistance criterionA submodule for determining a voltage auxiliary criterion as
Figure BDA0002589714820000155
Wherein u isvASampling value u of the ground voltage for A-phase valve side winding setvBSampling value u of ground voltage for B-phase valve side winding setvCAnd N is a first number for the sampling value of the ground voltage of the C-phase valve side winding set.
Optionally, the determining criteria module 510 includes: a longitudinal zero sequence impedance criterion determining submodule for determining the longitudinal zero sequence impedance criterion as
Figure BDA0002589714820000156
Wherein Z issetSetting the impedance value; and a harmonic ratio determining submodule for determining the harmonic ratio criterion as
Figure BDA0002589714820000157
Wherein, I'0setIs a second zero sequence circulating current definite value, I'tsetThe second harmonic ratio is fixed.
Optionally, the determining criteria module 510 includes: a submodule for determining a first balance winding circulation criterion, which is used for determining the first balance winding circulation criterion as
Figure BDA0002589714820000161
Wherein itset2For sampling the first circulating current by a constant value, Itset2At a first constant value of circulation, N1A first number; and a submodule for determining a second balance winding circulation criterion, which is used for determining the second balance winding circulation criterion as
Figure BDA0002589714820000162
Wherein, I'tset3Is a single constant value for the second circulation, Itset3Is the second loop flow fixed value.
Optionally, the determining module 510 determines a zero-sequence current ratio criterion submodule, configured to determine the zero-sequence current ratio criterion as the zero-sequence current ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer
Figure BDA0002589714820000163
Wherein the content of the first and second substances,
Figure BDA0002589714820000164
to balance the fundamental component of zero-sequence current of the winding, ItdcTo balance the magnitude of the dc component of the winding current,
Figure BDA0002589714820000165
to balance the fundamental component of the winding current, the balance winding current is taken from TA2,
Figure BDA0002589714820000166
for the fundamental component of the zero-sequence current of the grid-side winding, taken from TA1, I0setFor the first zero-sequence circulating current constant, ItsetIs a first harmonic ratio fixed value, and gamma is a zero-sequence current ratio fixed value; and a zero sequence voltage ratio determination submodule for determining the zero sequence voltage ratio as
Figure BDA0002589714820000167
Wherein, I "0setFor third zero-sequence circulating current, I "tsetIs a third harmonic ratio fixed value, alpha is a zero sequence voltage ratio fixed value,
Figure BDA0002589714820000168
for the zero sequence voltage difference on the network side,
Figure BDA0002589714820000169
one end of the A-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001610
the other end of the A-phase net side winding is connected with the ground voltage fundamental phasor,
Figure BDA00025897148200001611
one end of the B-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001612
the other end of the B-phase network side winding is connected with the ground voltage fundamental phasor,
Figure BDA00025897148200001613
one end of the C-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001614
the other end of the side winding of the C-phase network is grounded voltage fundamental phasor, 3 delta U0MAXAnd the maximum value of the zero sequence voltage difference of the network side in the N sampling points is obtained.
Optionally, the determining a first logical relationship module 520 includes: the first OR gate logic submodule is used for adopting first OR gate logic for the voltage auxiliary criterion and the harmonic ratio criterion; the second OR gate logic submodule is used for adopting second OR gate logic for the first balanced winding circulating current criterion and the second balanced winding circulating current criterion; and the turn-to-turn fault determining submodule is used for determining a turn-to-turn fault identification criterion by using the gate logic result of the first OR gate logic and the second OR gate logic, the current auxiliary criterion, the longitudinal zero-sequence impedance criterion, the first starting criterion and the second starting criterion through AND gate logic.
Optionally, the determine second logical relationship module 530 includes: and determining a grid valve side fault submodule, and determining a grid valve side fault positioning criterion by adopting OR gate logic for the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion.
Optionally, the determining module 540 includes: the network side inter-turn fault judgment submodule is used for judging the inter-turn fault of the series transformer to be the network side inter-turn fault under the condition that the inter-turn fault identification criterion and the network valve side fault positioning criterion pass through an AND gate logic outlet; and the sub-module for judging the turn-to-turn fault of the valve side is used for judging the turn-to-turn fault of the series transformer to be the turn-to-turn fault of the valve side after the fault positioning criterion of the network valve side passes through the NOT gate logic and then passes through the AND gate logic outlet together with the turn-to-turn fault identification criterion.
Thus, according to the present embodiment, with the apparatus 500 for series transformer turn-to-turn fault protection, according to the pre-collected parameters of the series transformer turn-to-turn fault, the first start criterion, the second start criterion, the current auxiliary criterion, the longitudinal zero-sequence impedance criterion, the voltage auxiliary criterion, the harmonic ratio criterion, the first balanced winding circulating current criterion, the second balanced winding circulating current criterion, the zero-sequence current ratio criterion, and the zero-sequence voltage ratio criterion are determined, and the logical relationship of the turn-to-turn fault identification criterion and the logical relationship of the network valve side fault location criterion are determined. And finally, judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Therefore, turn-to-turn faults of the series transformer are identified, and reliable protection actions of the turn-to-turn faults of the series transformer are determined according to the specific faults of the turn-to-turn faults of the series transformer. Therefore, the problem of insufficient sensitivity during turn-to-turn faults of the windings of the series transformer is solved, and the safe operation of the series transformer is ensured. Therefore, the technical problem that how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage of a winding and ensure safe operation of the series transformer in the prior art is necessary is solved.
Example 3
Fig. 6 shows an arrangement 600 for turn-to-turn fault protection of a series transformer according to the present embodiment, which arrangement 600 corresponds to the method according to the first aspect of embodiment 1. Referring to fig. 6, the apparatus 600 includes: a processor 610; and a memory 620 coupled to the processor 610 for providing instructions to the processor 610 to process the following processing steps: determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer; determining a logical relationship of turn-to-turn fault identification criteria according to a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion and a second balanced winding circulating current criterion; determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Optionally, the operation of determining the first start criterion and the second start criterion according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, determining a first starting criterion as it＞istart0Wherein i istTo balance the winding current sample values, istart0Starting a constant value for the current; and determining a second starting criterion as u according to pre-acquired parameters of turn-to-turn faults of the series transformerHA-uEA+uHB-uEB+uHC-uEC＞ustartWherein u isHASampling value u of voltage to ground at one end of A-phase network side windingEASampling value u of the other end of the A-phase network side winding to the ground voltageHBSampling a voltage to ground voltage value u of one end of a B-phase network side windingEBSampling value u of the other end of the B-phase network side winding to the ground voltageHCSampling value u of voltage to ground at one end of C-phase network side windingECSampling value u for the other end of the C-phase network side winding to the ground voltagestartA fixed value is initiated for the voltage.
Optionally, the current auxiliary criterion and the voltage are determined according to pre-acquired parameters of turn-to-turn faults of the series transformerThe operation of the auxiliary criterion comprises: according to the pre-collected parameters of turn-to-turn faults of the series transformer, the current auxiliary criterion is determined as
Figure BDA0002589714820000181
Wherein the content of the first and second substances,
Figure BDA0002589714820000182
is the effective value of the fundamental wave phasor of the A-phase network side current,
Figure BDA0002589714820000183
the effective value of the current fundamental wave phasor at the side of the B-phase network,
Figure BDA0002589714820000184
is the effective value of the C-phase network side current fundamental wave phasor, IsetThe current auxiliary constant value is set; and determining the auxiliary voltage criterion as
Figure BDA0002589714820000185
Wherein u isvASampling value u of the ground voltage for A-phase valve side winding setvBSampling value u of ground voltage for B-phase valve side winding setvCAnd N is a first number for the sampling value of the ground voltage of the C-phase valve side winding set.
Optionally, the operation of determining the longitudinal zero-sequence impedance criterion and the harmonic ratio according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, the longitudinal zero-sequence impedance criterion is determined to be
Figure BDA0002589714820000186
Wherein Z issetSetting the impedance value; and determining the harmonic ratio criterion as
Figure BDA0002589714820000187
Wherein, I'0setIs a second zero sequence circulating current definite value, I'tsetThe second harmonic ratio is fixed.
Optionally, the operation of determining the first balanced winding circulating current criterion and the second balanced winding circulating current criterion according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, determining a first balance winding circulation criterion as
Figure BDA0002589714820000191
Wherein itset2 is the first circulating current sample constant, Itset2At a first constant value of circulation, N1A first number; and determining a second balance winding circulation criterion as
Figure BDA0002589714820000192
Wherein, I'tset3Is a single constant value for the second circulation, Itset3Is the second loop flow fixed value.
Optionally, the operation of determining the zero-sequence current ratio criterion and the zero-sequence voltage ratio criterion according to the pre-collected parameters of the turn-to-turn fault of the series transformer includes: according to the pre-collected parameters of turn-to-turn faults of the series transformer, the zero-sequence current ratio criterion is determined as
Figure BDA0002589714820000193
Wherein the content of the first and second substances,
Figure BDA0002589714820000194
to balance the fundamental component of zero-sequence current of the winding, ItdcTo balance the magnitude of the dc component of the winding current,
Figure BDA0002589714820000195
to balance the fundamental component of the winding current, the balance winding current is taken from TA2,
Figure BDA0002589714820000196
for the fundamental component of the zero-sequence current of the grid-side winding, taken from TA1, I0setFor the first zero-sequence circulating current constant, ItsetIs a first harmonic ratio fixed value, and gamma is a zero-sequence current ratio fixed value; and according to a pre-collected concatenationThe parameter of turn-to-turn fault of the transformer determines the zero sequence voltage ratio criterion as
Figure BDA0002589714820000197
Wherein, I "0setFor third zero-sequence circulating current, I "tsetIs a third harmonic ratio fixed value, alpha is a zero sequence voltage ratio fixed value,
Figure BDA0002589714820000198
for the zero sequence voltage difference on the network side,
Figure BDA0002589714820000199
one end of the A-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001910
the other end of the A-phase net side winding is connected with the ground voltage fundamental phasor,
Figure BDA00025897148200001911
one end of the B-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001912
the other end of the B-phase network side winding is connected with the ground voltage fundamental phasor,
Figure BDA00025897148200001913
one end of the C-phase network side winding is a fundamental phasor to the ground voltage,
Figure BDA00025897148200001914
the other end of the side winding of the C-phase network is grounded voltage fundamental phasor, 3 delta U0MAXAnd the maximum value of the zero sequence voltage difference of the network side in the N sampling points is obtained.
Optionally, determining a logical relationship of the turn-to-turn fault identification criterion according to a first start criterion, a second start criterion, a current assist criterion, a longitudinal zero-sequence impedance criterion, a voltage assist criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, and a second balanced winding circulating current criterion, includes: the voltage auxiliary criterion and the harmonic ratio criterion adopt a first OR gate logic; the first balanced winding circulation criterion and the second balanced winding circulation criterion adopt second OR gate logic; and determining turn-to-turn fault identification criteria by using gate logic results of the first OR gate logic and the second OR gate logic, the current auxiliary criteria, the longitudinal zero-sequence impedance criteria, the first starting criteria and the second starting criteria through AND gate logic.
Optionally, determining a logical relationship of the network valve side fault location criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion, and the zero sequence voltage ratio criterion includes: and determining the fault positioning criterion of the grid valve side by adopting OR gate logic according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion.
Optionally, determining the category of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault location, including: under the condition that the turn-to-turn fault identification criterion and the network valve side fault positioning criterion pass through an AND gate logic outlet, judging that the turn-to-turn fault of the series transformer is a network side turn-to-turn fault; and after the network valve side fault positioning criterion is subjected to NOT gate logic, and then the network valve side fault positioning criterion and the turn-to-turn fault identification criterion are subjected to AND gate logic outlet, and the turn-to-turn fault of the series transformer is judged to be a valve side turn-to-turn fault.
Thus, according to the present embodiment, with the apparatus 600 for series transformer turn-to-turn fault protection, according to the pre-collected parameters of the series transformer turn-to-turn fault, a first start criterion, a second start criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion, and a zero-sequence voltage ratio criterion are determined, and a logical relationship of the turn-to-turn fault identification criterion and a logical relationship of the network valve side fault location criterion are determined. And finally, judging the type of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the type of the turn-to-turn faults of the series transformer, wherein the types of the turn-to-turn faults of the series transformer are divided into network side turn-to-turn faults and valve side turn-to-turn faults.
Therefore, turn-to-turn faults of the series transformer are identified, and reliable protection actions of the turn-to-turn faults of the series transformer are determined according to the specific faults of the turn-to-turn faults of the series transformer. Therefore, the problem of insufficient sensitivity during turn-to-turn faults of the windings of the series transformer is solved, and the safe operation of the series transformer is ensured. Therefore, the technical problem that how to quickly determine turn-to-turn fault protection of the series transformer, avoid fault development and damage of a winding and ensure safe operation of the series transformer in the prior art is necessary is solved.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (12)

1. A method for determining turn-to-turn fault protection for a series transformer using voltage and current, comprising:
determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer;
determining a logical relationship of inter-turn fault identification criteria based on the first start criterion, the second start criterion, the current assist criterion, the longitudinal zero-sequence impedance criterion, the voltage assist criterion, the harmonic ratio criterion, the first balanced winding circulating current criterion, and the second balanced winding circulating current criterion;
determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and
and judging the type of the turn-to-turn fault of the series transformer according to the logic relationship of the turn-to-turn fault identification and the logic relationship of the network valve side fault location, and determining the reliable protection action of the turn-to-turn fault of the series transformer after judging the type of the turn-to-turn fault of the series transformer, wherein the types of the turn-to-turn fault of the series transformer are divided into a network side turn-to-turn fault and a valve side turn-to-turn fault.
2. The method of claim 1, wherein determining the first start-up criterion and the second start-up criterion based on pre-collected parameters of series transformer turn-to-turn faults comprises:
according to pre-acquired parameters of turn-to-turn faults of the series transformer, determining that the first starting criterion is it＞istart0Wherein i istTo balance the winding current sample values, istart0Starting a constant value for the current; and
according to pre-acquired parameters of turn-to-turn faults of the series transformer, the second starting criterion is determined to be uHA-uEA+uHB-uEB+uHC-uEC＞ustartWherein u isHASampling value u of voltage to ground at one end of A-phase network side windingEASampling value u of the other end of the A-phase network side winding to the ground voltageHBSampling a voltage to ground voltage value u of one end of a B-phase network side windingEBSampling value u of the other end of the B-phase network side winding to the ground voltageHCSampling value u of voltage to ground at one end of C-phase network side windingECSampling value u for the other end of the C-phase network side winding to the ground voltagestartA fixed value is initiated for the voltage.
3. The method of claim 2, comprising: determining the current assist criterion and the voltage assist criterion based on pre-collected parameters of turn-to-turn faults of the series transformer, comprising:
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the current auxiliary criterion is determined to be
Figure FDA0002589714810000021
Wherein the content of the first and second substances,
Figure FDA0002589714810000022
is the effective value of the fundamental wave phasor of the A-phase network side current,
Figure FDA0002589714810000023
the effective value of the current fundamental wave phasor at the side of the B-phase network,
Figure FDA0002589714810000024
is the effective value of the C-phase network side current fundamental wave phasor, IsetThe current auxiliary constant value is set; and
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the voltage auxiliary criterion is determined to be
Figure FDA0002589714810000025
Wherein u isvASampling value u of the ground voltage for A-phase valve side winding setvBSampling value u of ground voltage for B-phase valve side winding setvCAnd N is a first number for the sampling value of the ground voltage of the C-phase valve side winding set.
4. The method according to claim 2, wherein the operation of determining the longitudinal zero sequence impedance criterion and the harmonic ratio value according to pre-collected parameters of turn-to-turn faults of the series transformer comprises:
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the longitudinal zero-sequence impedance criterion is determined to be
Figure FDA0002589714810000026
Wherein Z issetSetting the impedance value; and
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the harmonic ratio criterion is determined to be
Figure FDA0002589714810000027
Wherein, I'0setIs a second zero sequence circulating current definite value, I'tsetThe second harmonic ratio is fixed.
5. The method of claim 2, wherein determining the first balanced winding circulating current criterion and the second balanced winding circulating current criterion based on pre-collected parameters of a series transformer turn-to-turn fault comprises:
according to the pre-collected parameters of turn-to-turn faults of the series transformer, determining the first balance winding circulation criterion as
Figure FDA0002589714810000028
Wherein itset2For sampling the first circulating current by a constant value, Itset2At a first constant value of circulation, N1A first number; and
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the second balance winding circulation criterion is determined to be
Figure FDA0002589714810000029
Wherein, I'tset3Is a single constant value for the second circulation, Itset3Is the second loop flow fixed value.
6. The method of claim 2, wherein the operation of determining the zero-sequence current ratio criterion and the zero-sequence voltage ratio criterion based on pre-collected parameters of series transformer turn-to-turn faults comprises:
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the zero-sequence current ratio criterion is determined to be
Figure FDA0002589714810000031
Wherein the content of the first and second substances,
Figure FDA0002589714810000032
to balance the fundamental component of zero-sequence current of the winding, ItdcTo balance the magnitude of the dc component of the winding current,
Figure FDA0002589714810000033
to balance the fundamental component of the winding current, the balance winding current is taken from TA2,
Figure FDA0002589714810000034
for the fundamental component of the zero-sequence current of the grid-side winding, taken from TA1, I0setFor the first zero-sequence circulating current constant, ItsetIs a first harmonic ratio fixed value, and gamma is a zero-sequence current ratio fixed value; and
according to the pre-collected parameters of turn-to-turn faults of the series transformer, the zero-sequence voltage ratio criterion is determined to be
Figure FDA0002589714810000035
Wherein, I "0setFor third zero-sequence circulating current, I "tsetIs a third harmonic ratio fixed value, alpha is a zero sequence voltage ratio fixed value,
Figure FDA0002589714810000036
for the zero sequence voltage difference on the network side,
Figure FDA0002589714810000037
Figure FDA0002589714810000038
one end of the A-phase network side winding is a fundamental phasor to the ground voltage,
Figure FDA0002589714810000039
the other end of the A-phase net side winding is connected with the ground voltage fundamental phasor,
Figure FDA00025897148100000310
one end of the B-phase network side winding is a fundamental phasor to the ground voltage,
Figure FDA00025897148100000311
the other end of the B-phase network side winding is connected with the ground voltage fundamental phasor,
Figure FDA00025897148100000312
one end of the C-phase network side winding is a fundamental phasor to the ground voltage,
Figure FDA00025897148100000313
the other end of the side winding of the C-phase network is grounded voltage fundamental phasor, 3 delta U0MAXAnd the maximum value of the zero sequence voltage difference of the network side in the N sampling points is obtained.
7. The method of claim 1, wherein determining a logical relationship for an inter-turn fault identification criterion based on a first start criterion, a second start criterion, a current assist criterion, a longitudinal zero sequence impedance criterion, a voltage assist criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, and a second balanced winding circulating current criterion comprises:
the voltage assist criterion and the harmonic ratio criterion employ a first OR logic;
the first balanced winding circulating current criterion and the second balanced winding circulating current criterion adopt second OR gate logic;
and determining the turn-to-turn fault identification criterion by using the gate logic result of the first or gate logic and the second or gate logic, the current auxiliary criterion, the longitudinal zero-sequence impedance criterion, the first starting criterion and the second starting criterion through AND gate logic.
8. The method of claim 1, wherein determining a logical relationship of a grid valve side fault location criterion based on the zero sequence current ratio criterion, the harmonic ratio criterion, and the zero sequence voltage ratio criterion comprises:
and determining a fault positioning criterion of the grid valve side by adopting OR gate logic according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion.
9. The method of claim 1, wherein determining the category of the series transformer inter-turn faults from the logical relationship of inter-turn fault identification and the logical relationship of grid valve side fault location comprises:
under the condition that the turn-to-turn fault identification criterion and the network valve side fault positioning criterion are exported through an AND gate logic, the turn-to-turn fault of the series transformer is judged to be a network side turn-to-turn fault; and
and after the network valve side fault positioning criterion is subjected to NOT gate logic, and then the network valve side fault positioning criterion and the turn-to-turn fault identification criterion are subjected to AND gate logic outlet, and the turn-to-turn fault of the series transformer is judged to be a valve side turn-to-turn fault.
10. A storage medium comprising a stored program, wherein the method of any one of claims 1 to 9 is performed by a processor when the program is run.
11. An apparatus for determining turn-to-turn fault protection for a series transformer using voltage and current, comprising:
the determination criterion module is used for determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer;
the device comprises a first logic relation determining module, a second logic relation determining module and a fault judging module, wherein the first logic relation determining module is used for determining the logic relation of turn-to-turn fault identification criteria according to a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion and a second balanced winding circulating current criterion;
the second logic relation determining module is used for determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and
and the judging module is used for judging the category of turn-to-turn faults of the series transformer according to the logic relationship of turn-to-turn fault identification and the logic relationship of network valve side fault positioning, and determining the reliable protection action of the turn-to-turn faults of the series transformer after judging the category of the turn-to-turn faults of the series transformer, wherein the category of the turn-to-turn faults of the series transformer is divided into network side turn-to-turn faults and valve side turn-to-turn faults.
12. An apparatus for determining turn-to-turn fault protection for a series transformer using voltage and current, comprising:
a processor; and
a memory coupled to the processor for providing instructions to the processor for processing the following processing steps:
determining a first starting criterion, a second starting criterion, a current auxiliary criterion, a longitudinal zero-sequence impedance criterion, a voltage auxiliary criterion, a harmonic ratio criterion, a first balanced winding circulating current criterion, a second balanced winding circulating current criterion, a zero-sequence current ratio criterion and a zero-sequence voltage ratio criterion according to pre-collected parameters of turn-to-turn faults of the series transformer;
determining a logical relationship of inter-turn fault identification criteria based on the first start criterion, the second start criterion, the current assist criterion, the longitudinal zero-sequence impedance criterion, the voltage assist criterion, the harmonic ratio criterion, the first balanced winding circulating current criterion, and the second balanced winding circulating current criterion;
determining the logic relation of the network valve side fault positioning criterion according to the zero sequence current ratio criterion, the harmonic ratio criterion and the zero sequence voltage ratio criterion; and
and judging the type of the turn-to-turn fault of the series transformer according to the logic relationship of the turn-to-turn fault identification and the logic relationship of the network valve side fault location, and determining the reliable protection action of the turn-to-turn fault of the series transformer after judging the type of the turn-to-turn fault of the series transformer, wherein the types of the turn-to-turn fault of the series transformer are divided into a network side turn-to-turn fault and a valve side turn-to-turn fault.
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