CN106950459B - Distributed single-phase earth fault judgment method - Google Patents
Distributed single-phase earth fault judgment method Download PDFInfo
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- CN106950459B CN106950459B CN201710228222.2A CN201710228222A CN106950459B CN 106950459 B CN106950459 B CN 106950459B CN 201710228222 A CN201710228222 A CN 201710228222A CN 106950459 B CN106950459 B CN 106950459B
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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
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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Abstract
The invention discloses a distributed single-phase earth fault judging method, which comprises the steps of firstly obtaining electric quantity fault recording data when a single-phase earth fault occurs, calculating a zero-sequence transient power direction and a zero-sequence current amplitude, then calling historical fault recording data and the electric quantity fault recording data when the single-phase earth fault occurs to compare the transient power direction and the zero-sequence current amplitude, and finally logically judging whether the fault line is a fault line. The invention provides a method for independently judging whether a single-phase earth fault occurs by using a distributed terminal, aiming at the problem that a complex multi-branch line power distribution network carries out single-phase earth fault line selection and fault branch search, and the method adopts a new measure for judging whether the monitored line or line branch has the single-phase earth fault by using the distributed terminal, so that the efficiency of automatically judging, searching and removing the fault branch of the single-phase earth fault is greatly improved.
Description
Technical Field
The invention relates to a single-phase earth fault line selection method, in particular to a distributed single-phase earth fault judgment method, and belongs to the technical field of relay protection of power systems.
Background
A single-phase grounding fault in a 6-35 kV medium-voltage power distribution network is the fault type which occurs most frequently. After the single-phase earth fault, the system is allowed to be operated for no more than 2 hours at maximum, and the fault operation can be carried out to improve the power supply reliability. The common practice of users is to perform sequential open circuit on the bus outgoing line with a fault, and judge whether the open circuit is correct by detecting whether the bus zero sequence voltage disappears. However, the power failure phenomenon of a non-fault line is often short-time, which is not beneficial to ensuring the power supply reliability. Therefore, most transformer substations are designed and provided with special low-current line selection devices for fault line selection, and the dispatching end performs route pulling according to reported line selection results.
The existing line selection device mostly adopts a centralized design, and the line selection method is also applied on the basis. In a conventional line selection method, zero-sequence voltage signals and zero-sequence current signals in the same time period are collected in a centralized mode after a fault occurs, and logical judgment of amplitude comparison, phase comparison or power direction is performed. But the method is not suitable for the line selection based on the centralized design for the independent distributed terminals. Although the low-current ground fault line selection function of the comprehensive protection device for the line of the transformer substation is independent judgment, the reliability of the low-current ground fault line selection cannot be ensured in the aspects of sampling frequency, line selection algorithm and the like because the hardware architecture of the comprehensive protection device is specially designed for line protection.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a distributed single-phase earth fault judgment method, which solves the problem that the traditional technology can not utilize mutually independent distributed terminals to carry out small-current earth fault line selection.
The technical scheme adopted by the invention for solving the technical problems is as follows:
The invention provides a distributed single-phase earth fault judging method which realizes the logical judgment of whether a single-phase earth fault line occurs in the line by analyzing and comparing the current fault data and the historical fault record data of the single line.
Further, the current fault data and the historical fault record data comprise electrical quantity fault recording data and remote communication quantity data.
Further, the logic judgment process of whether the line has the single-phase earth fault line is as follows: calculating a zero sequence transient power direction and a zero sequence current amplitude according to single line electric quantity fault recording data when a single-phase earth fault occurs, simultaneously calling historical fault recording data of the line to compare the transient power direction with the zero sequence current amplitude, and if the calculated zero sequence transient power direction is the same as the transient zero sequence reactive power direction when the line is a fault line in the historical fault recording data and is opposite to the transient zero sequence reactive power direction when the line is a non-fault line, and the calculated zero sequence current amplitude is larger than the average value of the zero sequence current transient amplitudes when the line is a non-fault line, judging that the line is a fault line.
The invention provides another distributed single-phase earth fault judging method, which comprises the steps of firstly obtaining electric quantity fault recording data when a single-phase earth fault occurs, calculating a zero-sequence transient power direction and a zero-sequence current amplitude, then calling historical fault recording data and the electric quantity fault recording data when the single-phase earth fault occurs to compare the transient power direction with the zero-sequence current amplitude, and finally logically judging whether a line (namely a line or a line branch monitored by a current distributed terminal) is a fault line.
Further, the process of logically judging whether the line is a fault line comprises the following steps:
Step 1, acquiring and storing single-phase earth fault recording data of the line at time t 0;
Step 2, calculating a transient zero-sequence reactive power direction Di and a transient amplitude Ai of zero-sequence current according to the single-phase earth fault recording data of the line stored at the moment t 0;
Step 3, a transient zero-sequence reactive power direction array D [ i-1] and a zero-sequence current transient amplitude array A [ i-1] in the historical fault record data of the line are called, and if the k-th-order line is a fault line, the j-th-order line is a non-fault line, and k + j is i-1;
Step 4, if the direction Di of the transient zero-sequence reactive power of the current time is the same as the direction of the transient zero-sequence reactive power of k faults of the current time in a transient zero-sequence reactive power direction array D [ i-1], the direction of the transient zero-sequence reactive power of j non-fault lines is opposite, and the transient amplitude Ai of the zero-sequence current is larger than the average value of the transient amplitudes of the non-fault lines of the j non-fault lines, judging the current fault line as the current line;
And 5, if the direction Di of the transient zero-sequence reactive power of the current time is opposite to the direction of the transient zero-sequence reactive power of k faults of the current time in the transient zero-sequence reactive power direction array D [ i-1], the directions of the transient zero-sequence reactive powers of j non-local fault lines are the same, and the transient amplitude Ai of the zero-sequence current is smaller than the average value of the transient amplitudes of the zero-sequence current of k fault lines, judging the current fault line as a non-local line.
Further, when i is equal to 1, the ground fault occurs for the first time, and if the transient zero-sequence reactive power direction Di is greater than 0, the line is determined to be a fault line; and if the transient zero-sequence reactive power direction Di is less than 0, judging that the line is a non-fault line.
Further, the zero sequence current transient amplitude is the maximum value of the accumulated values of all sampling points with 5ms as a time window in a time period from 20ms before the occurrence of the ground fault to 100ms after the occurrence of the ground fault.
The invention has the beneficial effects that: the invention provides a method for selecting a low-current ground fault line by using mutually independent distributed terminals, which can independently analyze, compare and logically judge whether a line (namely the line or the line branch monitored by the distributed terminals) has a single-phase ground fault by using acquired current grounding fault data and historical fault record data when the distributed terminals independently operate and monitor a single line or a single branch of the line.
The invention provides a method for independently judging whether a single-phase earth fault occurs by using a distributed terminal, aiming at the problem that a complex multi-branch line power distribution network carries out single-phase earth fault line selection and fault branch search, and the method adopts a new measure for judging whether the monitored line or line branch has the single-phase earth fault by using the distributed terminal, so that the efficiency of automatically judging, searching and removing the fault branch of the single-phase earth fault is greatly improved.
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FIG. 1 is a flow chart of a method of the present invention;
Fig. 2 is a detailed flow chart of a distributed single-phase ground fault logic determination according to the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Example 1
As shown in fig. 1, the distributed single-phase ground fault determining method of the present invention implements logical determination of whether a single-phase ground fault occurs in a single line by analyzing and comparing current fault data of the line with historical fault record data.
Further, the current fault data and the historical fault record data comprise electrical quantity fault recording data and remote communication quantity data.
Further, the logic judgment process of whether the line has the single-phase earth fault line is as follows: calculating a zero sequence transient power direction and a zero sequence current amplitude according to single line electric quantity fault recording data when a single-phase earth fault occurs, simultaneously calling historical fault recording data of the line to compare the transient power direction with the zero sequence current amplitude, and if the calculated zero sequence transient power direction is the same as the transient zero sequence reactive power direction when the line is a fault line in the historical fault recording data and is opposite to the transient zero sequence reactive power direction when the line is a non-fault line, and the calculated zero sequence current amplitude is larger than the average value of the zero sequence current transient amplitudes when the line is a non-fault line, judging that the line is a fault line. When the distributed terminal operates and monitors a single line or a single branch line of the line independently, the distributed single-phase ground fault determining method of embodiment 1 is used to process the acquired current ground fault data and the historical fault record data, so that the distributed single-phase ground fault determining method can independently perform analysis, comparison and logic determination to determine whether the line (i.e., the line or the line branch monitored by the distributed terminal operating independently) has a single-phase ground fault.
Example 2
As shown in fig. 1, another distributed single-phase earth fault determining method of the present invention first obtains electrical quantity fault recording data when a single-phase earth fault occurs and calculates a zero-sequence transient power direction and a zero-sequence current amplitude, then retrieves historical fault recording data and electrical quantity fault recording data when a single-phase earth fault occurs to compare the transient power direction and the zero-sequence current amplitude, and finally logically determines whether the line is a fault line.
Further, as shown in fig. 2, the specific process of logically determining whether the local line is a faulty line includes the following steps:
Step 1, acquiring and storing single-phase earth fault recording data of the line at time t 0;
Step 2, calculating a transient zero-sequence reactive power direction Di and a transient amplitude Ai of zero-sequence current according to the single-phase earth fault recording data of the line stored at the moment t 0;
Step 3, a transient zero-sequence reactive power direction array D [ i-1] and a zero-sequence current transient amplitude array A [ i-1] in the historical fault record data of the line are called, and if the k-th-order line is a fault line, the j-th-order line is a non-fault line, and k + j is i-1;
Step 4, if the direction Di of the transient zero-sequence reactive power of the current time is the same as the direction of the transient zero-sequence reactive power of k faults of the current time in a transient zero-sequence reactive power direction array D [ i-1], the direction of the transient zero-sequence reactive power of j non-fault lines is opposite, and the transient amplitude Ai of the zero-sequence current is larger than the average value of the transient amplitudes of the non-fault lines of the j non-fault lines, judging the current fault line as the current line;
And 5, if the direction Di of the transient zero-sequence reactive power of the current time is opposite to the direction of the transient zero-sequence reactive power of k faults of the current time in the transient zero-sequence reactive power direction array D [ i-1], the directions of the transient zero-sequence reactive powers of j non-local fault lines are the same, and the transient amplitude Ai of the zero-sequence current is smaller than the average value of the transient amplitudes of the zero-sequence current of k fault lines, judging the current fault line as a non-local line.
Further, when i is equal to 1, the ground fault occurs for the first time, and if the transient zero-sequence reactive power direction Di is greater than 0, the line is determined to be a fault line; and if the transient zero-sequence reactive power direction Di is less than 0, judging that the line is a non-fault line.
Further, the zero sequence current transient amplitude is the maximum value of the accumulated values of all sampling points with 5ms as a time window in a time period from 20ms before the occurrence of the ground fault to 100ms after the occurrence of the ground fault.
For the problem of single-phase ground fault line selection and fault branch search in a complex multi-branch line power distribution network, embodiment 2 provides a new technology for performing low-current ground fault line selection by using mutually independent distributed terminals, and when a single line or a single branch line of the line is monitored by independently operating the distributed terminals, the obtained current ground fault data and historical fault record data are used to independently perform analysis, comparison and logic judgment on whether the line has a single-phase ground fault or not. The invention relates to a method for independently judging whether a single-phase earth fault occurs by using a distributed terminal, which is a new measure for judging whether a line or a line branch monitored by the distributed terminal has the single-phase earth fault, thereby greatly improving the efficiency of automatically judging, searching and removing the single-phase earth fault.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (4)
1. A distributed single-phase earth fault judging method is characterized in that current fault data and historical fault record data of a single line are analyzed and compared through a distributed terminal which operates and monitors independently to realize logic judgment of whether the line has a single-phase earth fault;
The logic judgment process of whether the line has the single-phase earth fault is as follows: calculating a zero sequence transient power direction and a zero sequence current amplitude according to single line electric quantity fault recording data when a single-phase earth fault occurs, simultaneously calling historical fault record data of the line to compare the zero sequence transient power direction with the zero sequence current amplitude, and if the calculated zero sequence transient power direction is the same as the zero sequence transient reactive power direction when the line is a fault line in the historical fault record data and is opposite to the zero sequence transient reactive power direction when the line is a non-fault line, and the calculated zero sequence current amplitude is larger than the average value of the zero sequence current amplitudes when the line is a non-fault line, judging that the line is a fault line;
The current fault data and historical fault log data also include teletraffic data.
2. A distributed single-phase earth fault judging method is characterized in that a distributed terminal operates independently, firstly, electric quantity fault wave recording data when a single-phase earth fault occurs are obtained, a zero-sequence transient power direction and a zero-sequence current amplitude value are calculated, then historical fault record data are obtained, the electric quantity fault wave recording data when the single-phase earth fault occurs are adjusted, the transient power direction and the zero-sequence current amplitude value are compared, and finally, whether a line is a fault line or not is judged logically;
The process of logically judging whether the line is a fault line comprises the following steps:
Step 1, acquiring and storing single-phase grounding electric quantity fault recording data of the line at a time t 0;
Step 2, calculating a zero-sequence transient reactive power direction Di and a zero-sequence current amplitude Ai according to the single-phase grounding electric quantity fault recording data of the line stored at the time t 0;
Step 3, a zero sequence transient state reactive power direction array D [ i-1] and a zero sequence current amplitude array A [ i-1] in the historical fault record data of the line are called, and if the k-th-order line is a fault line, the j-th-order line is a non-fault line, and k + j is i-1;
Step 4, if the direction Di of the current zero-sequence transient reactive power is the same as the zero-sequence transient reactive power direction of k faults of the current line in a zero-sequence transient reactive power direction array D [ i-1], the direction of the j non-fault line zero-sequence transient reactive power is opposite, and the amplitude Ai of the zero-sequence current is larger than the average value of the amplitude of the j non-fault line zero-sequence current, judging the current fault line as the current line;
And 5, if the direction Di of the current zero-sequence transient reactive power is opposite to the direction of the zero-sequence transient reactive power of k line faults in the zero-sequence transient reactive power direction array D [ i-1], the direction of the zero-sequence transient reactive power of j non-line faults is the same, and the zero-sequence current amplitude Ai is smaller than the zero-sequence current amplitude average value of k line faults, judging the current line fault as a non-line fault.
3. The distributed single-phase earth fault judgment method of claim 2, wherein when i is 1, an earth fault occurs for the first time, and if the zero-sequence transient reactive power direction Di is greater than 0, the line is judged to be a fault line; and if the zero sequence transient state reactive power direction Di is less than 0, judging that the line is a non-fault line.
4. The distributed single-phase ground fault determination method according to claim 2, wherein the zero-sequence current amplitude is a maximum value of an accumulated value of all sampling points within a time period from 20ms before the occurrence of the ground fault to 100ms after the occurrence of the ground fault and with 5ms as a time window.
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| CN108287286B (en) * | 2018-01-16 | 2023-03-14 | 济南置真电气有限公司 | Polarity verification method based on single-phase earth fault recording data |
| CN109406953A (en) * | 2018-12-29 | 2019-03-01 | 山东科汇电力自动化股份有限公司 | One kind is suitable for containing with bus loop power distribution network earth fault line selection method |
| CN110488154B (en) * | 2019-08-28 | 2021-06-22 | 国网四川省电力公司成都供电公司 | Low-current grounding line selection method for dispatching master station end |
| CN110632440A (en) * | 2019-09-29 | 2019-12-31 | 上海思源弘瑞自动化有限公司 | Transformer fault judgment method and device based on zero and negative sequence power directions |
| CN112649694B (en) * | 2019-10-12 | 2023-11-17 | 南京南瑞继保电气有限公司 | Method for judging single-phase grounding fault of low-current grounding system |
| CN111044935B (en) * | 2019-12-31 | 2022-06-21 | 苏州华电电气股份有限公司 | Multipoint grounding live detection device for transformer core |
| CN111426915B (en) * | 2020-05-11 | 2022-06-07 | 云南电网有限责任公司电力科学研究院 | Distributed small current ground fault positioning method |
| CN114019312A (en) * | 2021-11-10 | 2022-02-08 | 国网山东省电力公司临沂供电公司 | Decentralized small-current grounding line selection device and method |
| CN114325467B (en) * | 2021-11-29 | 2024-03-29 | 南京海兴电网技术有限公司 | Composite high-precision detection and judgment method for single-phase ground fault |
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