CN114243652B - Terminal fixed value remote modification system for 10kV line distribution switch - Google Patents

Terminal fixed value remote modification system for 10kV line distribution switch Download PDF

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Publication number
CN114243652B
CN114243652B CN202111442403.8A CN202111442403A CN114243652B CN 114243652 B CN114243652 B CN 114243652B CN 202111442403 A CN202111442403 A CN 202111442403A CN 114243652 B CN114243652 B CN 114243652B
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fixed value
line
protection
modification
value
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CN114243652A (en
Inventor
马杰
严思齐
陈蒙
张腊
周艳平
刘磊
王英子
何静
杨凡奇
赵忠媛
杨威
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Yunnan Power Grid Co Ltd
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Yunnan Power Grid Co Ltd
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    • 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
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
    • 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
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a terminal fixed value remote modification system for a 10kV line distribution switch, which is based on an OCS system basic platform of a distribution network, and comprises an application layer, a calculation service layer and a data buffer layer which are distributed from top to bottom according to a logic architecture, wherein the data buffer layer is distributed in a logic architecture lower layer, a visual man-machine interface is distributed in an application layer logic architecture upper layer, the visual man-machine interface is deployed in a safe I area of the OCS system basic platform of the distribution network, and data of protection fixed values, remote signaling telemetry, a power grid model, power grid graphics and real-time states are acquired and stored through the OCS system basic platform of the distribution network. According to the invention, 92% of workload of intelligent switching constant value calculation and check is reduced, the success rate of remote placement is 98.7%, 1809.6 repeated constant value modification work is saved, more than 67% of switching constant value modification work of a base layer is reduced, the constant value setting accuracy is improved from 85.4% of field personnel modification to more than 97% of remote modification of a main station, and the false alarm and false action of self-configuration switching are reduced by more than 21%.

Description

Terminal fixed value remote modification system for 10kV line distribution switch
Technical Field
The invention relates to the technical field of relay protection, in particular to a terminal fixed value remote modification system for a 10kV line distribution switch.
Background
Relay protection is an important component of a power system, and is an important technical means for ensuring safe and stable operation of a power grid. The correctness of the relay protection action is directly determined by whether the relay protection fixed value is calculated and set or not, and the current 10kV line switch (comprising a common switch and an intelligent switch) is calculated, checked and modified by spending a great deal of labor, so that not only is a great deal of time and energy spent by basic operation and maintenance personnel and relay management personnel spent, but also higher checking and setting accuracy cannot be ensured, thereby the relay protection fixed value becomes one of hidden fault sources, the accident can be enlarged during the fault, the analysis and the treatment of the faults by a dispatcher and an operator are not facilitated, and the accident treatment and the recovery of a non-fault section are delayed.
The protection fixed value calculation, checking, modification and fixed value single retrieval of the current 10kV line switch have the following problems:
and (3) constant value calculation: the calculation work of the protection fixed value is completed by relevant protection personnel of each county and regional bureau, and the following problems mainly exist: firstly, part of county and district offices do not have corresponding posts to specially accept protection work, so that responsibility division is ambiguous; secondly, with the application and the promotion of the self-healing of the distribution network, the setting of the protection fixed value is more complex; thirdly, the skill level of the personnel engaged in protection by each county office is uneven, the overall level is generally not high, and the fixed value setting level needs to be improved;
Checking fixed values: the fixed value checking work submits the calculated fixed value to a relay room of a system part for checking by each county and district bureau, and the following problems mainly exist: firstly, because the distribution network equipment is huge in volume, the protection fixed value quantity to be checked is large, and a great amount of time is consumed for relay room operators in checking the fixed value; secondly, the manpower resources of the relay chamber are limited, so that the relay chamber is used as the last defense line for checking the rationality and the correctness of the fixed value, plays a relatively limited role, and is difficult to ensure the complete correctness of the fixed value;
and (5) constant value modification: the modification of the protection fixed value needs to be carried out on site by operators, and mainly has the following problems: firstly, the network distribution body is huge, and operation and maintenance personnel can bear the constant value modification work and also have heavy daily inspection, maintenance and other works, and the constant value modification work has hysteresis condition; secondly, the operation and maintenance lines of the local county and the district are located in remote geographic positions, so that the traffic is inconvenient and the operation and maintenance difficulty is high; thirdly, the manpower resources of each operation unit are insufficient, and the work and fixed value modification such as scheduled maintenance, live working, fault rush repair and daily inspection are difficult to coordinate; fourth, the skill level of operators of each unit is insufficient, so that the correctness of the fixed value modification of the switch is difficult to ensure, and the fixed value modification working pressure of each base unit is high;
And (5) retrieving a fixed value list: when a relay service person, a dispatcher and operation maintenance personnel check the fixed value list, the fixed value list needs to be downloaded from another system, the operation is tedious and time-consuming, and the work of related service personnel is inconvenient to develop.
Therefore, a corresponding terminal fixed value remote modification system for a 10kV line distribution switch needs to be proposed to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems, and provides a terminal fixed value remote modification system for a 10kV line distribution switch.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a terminal fixed value remote modification system for a 10kV line distribution switch is based on an OCS system basic platform of a distribution network, the system comprises an application layer, a calculation service layer and a data buffer layer which are distributed from top to bottom according to a logic architecture, wherein the data buffer layer is distributed at a logic architecture lower layer, a visual man-machine interface is distributed at an application layer logic architecture upper layer, the visual man-machine interface is deployed in a safe I area of the OCS system basic platform of the distribution network, data of protection fixed values, remote signaling telemetry, a power grid model, power grid graphics and real-time states are acquired and stored through the OCS system basic platform of the distribution network, and fixed value calculation, checking results, auxiliary analysis results and fixed value remote modification results are displayed through the visual man-machine interface, and the system further comprises:
Basic parameter data management, wherein the system acquires the latest SVG single line drawing file from a GIS system, combines the distribution network OCS system data, acquires equipment parameters related to the distribution network from the latest SVG single line drawing file, comprises basic parameter data of related distribution network equipment such as cables, overhead lines, total line lengths, transformers, circuit breakers and the like of the 10kV lines and the supplied lines, and stores the basic parameter data into a system database so as to derive basic data of single or multiple equipment;
system equivalent impedance management, namely importing basic data to the system equivalent impedance of a 10kV line of a 110kV transformer substation, a 35kV transformer substation and a 10kV switch station, and providing basic operations such as adding, modifying and deleting corresponding data;
matching relationship topology association management is realized, intelligent analysis of matching relationship is realized, corresponding equipment parameter data is obtained, a simplified diagram of simple equipment connection relationship is intelligently generated according to a single line diagram, editing operation of the corresponding topology relationship diagram is supported, impedance parameters of electric elements are calculated respectively according to the topology relationship diagram and equipment parameter information, and a topology network model is generated;
the fixed value checking rule base management is used for managing fixed value checking rules and can perform addition, modification and deletion operations on the fixed value rules;
The fixed value intelligent setting calculation is carried out, and intelligent automatic setting analysis is carried out on the protection equipment according to the topology network model and the impedance parameters of all the electrical elements and the existing fixed value setting principle;
and automatically generating a fixed value sheet, combining the fixed value calculated by the fixed value intelligent setting calculation module, selecting a corresponding fixed value sheet template according to the model of the protection device, the manufacturer and the position type of the circuit breaker and the existing setting rule, and automatically generating the fixed value sheet.
The fixed value is remotely modified, and the remote modification of the terminal protection fixed value is realized from the power distribution automation master station through the functional module;
the method comprises the steps of intelligently checking fixed values, checking the running fixed values according to the current running mode of a power grid, wherein the matching check of each level of switches refers to the protection matching rationality check of a to-be-checked protection type circuit breaker and an upper level circuit breaker, and the check of a single switch refers to the single consistency check of the to-be-checked circuit breaker and the required setting value in a system;
and managing the fixed value historical data, and forcedly generating a corresponding operation record for fixed value modification so as to inquire the fixed value modification record and facilitate later responsibility following, and archiving and storing the fixed value list in a system after each modification to form a fixed value list historical database.
As a further description of the above technical solution:
the automatic generation module of the fixed value list executes the following steps:
step one, automatically acquiring a 10kV line latest pattern and related equipment parameters according to SVG single line pattern files and an OCS (distribution network) system, wherein the parameters comprise equipment information such as cable length, cable model, overhead line length, overhead line model, line total length, transformer capacity, self-distribution breaker model, self-distribution breaker CT, PT transformation ratio and the like of the line and a substitute line, and associating corresponding equipment with each parameter of each primary equipment such as overhead wires, cables and transformers to form an equipment parameter database of the line;
step two, generating a device topology network model according to the connection relation among devices and the device parameters of the line in the device parameter database;
according to the topology network model, according to the existing fixed value setting calculation principle, setting the reclosing time limit according to the type of the breaker, and correspondingly generating a protection fixed value list to be set self-configured to the breaker.
As a further description of the above technical solution:
the system also comprises a voltage-time circuit setting principle and a current level difference circuit setting principle.
As a further description of the above technical solution:
in the system equivalent impedance management, basic data is imported through a data interface, excel, PDF importing modes and manual page recording modes.
As a further description of the above technical solution:
and in the intelligent setting calculation of the fixed value, the off-station breaker is automatically analyzed for the number of stages, and multistage cooperation calculation is carried out.
As a further description of the above technical solution:
and the checking of the operation fixed value in the fixed value intelligent checking comprises the matching check of all levels of switches and the check of a single switch.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the terminal fixed value remote modification system comprises an application layer, a calculation service layer and a data buffer layer which are distributed from top to bottom according to a logic architecture, wherein a distribution network OCS system basic platform is distributed at the lower layer of the logic architecture of the data buffer layer, a visual man-machine interface is distributed at the upper layer of the logic architecture of the application layer, the subsystem is deployed in a safe I area of the distribution network OCS system basic platform, data of a protection fixed value, remote signaling telemetry, a power grid model, a power grid graph and a real-time state are obtained and stored through the distribution network OCS system basic platform, fixed value calculation, checking results, auxiliary analysis results and fixed value remote modification results are displayed through the visual man-machine interface, the fixed value calculation and checking functions of a power distribution automation master station are realized, the workload of intelligent switch fixed value calculation and checking is reduced, the remote placement success rate is 98.7%, the fixed value modification work of 1809.6 times is saved, and the switch fixed value modification work of a base layer is reduced by more than 67%. In addition, the setting accuracy of the fixed value is improved from 85.4% modified by field personnel to more than 97% modified remotely by a main station, and the false alarm and false action of the self-configuration switch are reduced by more than 21%.
Drawings
FIG. 1 is a diagram of a system architecture for remote modification of terminal settings in the present invention;
FIG. 2 is a functional block diagram of the system of the present invention;
FIG. 3 is a graph showing the timing of the main voltage versus time switch according to the present invention;
FIG. 4 is a system block diagram of an automatic generation module of a fixed value sheet in the invention;
fig. 5 is a diagram showing a 10kV line self-circuit breaker distribution diagram in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
referring to fig. 1-4, a terminal fixed value remote modification system for a 10kV line distribution switch is disclosed, based on an OCS system base platform of a distribution network, the system includes an application layer, a calculation service layer, a data buffer layer, and a data buffer layer, which are distributed from top to bottom according to a logic architecture, a visual man-machine interface is distributed on an upper layer of the application layer logic architecture, and the system is deployed in a safe i area of the OCS system base platform of the distribution network, and obtains and stores data of protection fixed value, remote signaling telemetry, power grid model, power grid graph, real-time status through the OCS system base platform of the distribution network, and displays fixed value calculation, checking result, auxiliary analysis result, and fixed value remote modification result through the visual man-machine interface, and the system further includes:
Basic parameter data management, wherein the system acquires the latest SVG single line drawing file from a GIS system, combines the distribution network OCS system data, acquires equipment parameters related to the distribution network from the latest SVG single line drawing file, comprises basic parameter data of related distribution network equipment such as cables, overhead lines, total line lengths, transformers, circuit breakers and the like of the 10kV lines and the supplied lines, and stores the basic parameter data into a system database so as to derive basic data of single or multiple equipment;
the system equivalent impedance management is used for importing basic data to the system equivalent impedance of the 10kV line of the 110kV transformer substation, the 35kV transformer substation and the 10kV switch station, providing basic operations such as adding, modifying and deleting corresponding data, and importing the basic data through a data interface, an Excel, a PDF importing mode and a manual page recording mode;
matching relationship topology association management is realized, intelligent analysis of matching relationship is realized, corresponding equipment parameter data is obtained, a simplified diagram of simple equipment connection relationship is intelligently generated according to a single line diagram, editing operation of the corresponding topology relationship diagram is supported, impedance parameters of electric elements are calculated respectively according to the topology relationship diagram and equipment parameter information, and a topology network model is generated;
The fixed value checking rule base management is used for managing fixed value checking rules and can perform addition, modification and deletion operations on the fixed value rules;
the fixed value intelligent setting calculation is carried out, intelligent automatic setting analysis is carried out on the protection equipment according to the topology network model and impedance parameters of all the electrical elements and the existing fixed value setting principle, and meanwhile, the automatic analysis series of the off-station circuit breaker is carried out, and multistage cooperation calculation is carried out;
and automatically generating a fixed value sheet, combining the fixed value calculated by the fixed value intelligent setting calculation module, selecting a corresponding fixed value sheet template according to the model of the protection device, the manufacturer and the position type of the circuit breaker and the existing setting rule, and automatically generating the fixed value sheet.
The remote modification of the fixed value is realized from the power distribution automation master station through the functional module, and the remote modification of the fixed value of the terminal is realized through issuing a command through the master station in the power distribution automation master station system. Drawing an operation graph of the relay protection device into a corresponding interval graph of the circuit breaker, and performing value modification operation by clicking a protection device primitive to enter a value modification editing page:
1. after logging in the distribution automation master station system, relevant staff inquires a circuit single line diagram of the circuit breaker to be modified, enters the interval diagram of the circuit breaker to be modified through the single line diagram, and finds out the modification primitive of the protection device.
2. When the related staff at the dispatching master station end enters the fixed value remote modification editing page, identity authentication is needed again, whether the staff has the operation authority is confirmed by verifying the user name and the password, and the staff can enter the fixed value modification detail page after the staff has the operation authority.
3. The fixed value modification supports automatic identification and filling of fixed value single fixed value (PDF, excel format) into a fixed value modification frame, and also supports manual entry by entry.
3. And after the operator confirms that the fixed value is correctly input and the checking is completed, submitting a fixed value remote modification operation application, inputting a user name, a password and a breaker code to be modified again by the operator to confirm the operation, transmitting the confirmed result to a guardian for checking, inputting the user name, the password and the breaker code to be modified by the guardian, checking and passing after confirming the correctness, and remotely modifying and presetting by the operator.
3.1 remote modification presetting, namely, a power distribution automation master station issues a fixed value modification instruction to a terminal to be modified, after the terminal receives the master station instruction, analyzes and checks data, places the issued fixed value into a fixed value modification area of the terminal, packages and encrypts fixed value data of the current fixed value modification area, sends the fixed value data to the master station, analyzes and verifies the received data, compares the received data with a fixed value list issued by the master station, and feeds back a check result after confirming that the fixed value data of the fixed value modification area of the terminal is consistent: the presetting is successful and the modification can be cancelled. Otherwise, feedback: the presetting fails;
And 3.2, after confirming that the presetting is successful, an operator clicks and executes the operation, and the automatic master station issues an execution instruction, the breaker terminal to be modified receives the instruction of the master station, and then the fixed value of the fixed value modifying region is imported into the operation fixed value region, during the period, the protection function of the device is withdrawn for a short time, the protection outlet is blocked, and after the fixed value of the fixed value region to be modified is successful, a new fixed value is re-started, and the protection outlet is unblocked. The terminal feeds back the modification result to the main station: successful execution;
if the operation fixed value is failed to solidify, the device alarms and locks, and the modified result is fed back to the master station: failure of execution;
after the fixed value execution fails, the terminal can be reset through a specific instruction issued by the main station, namely the device is restarted, and the fixed value is recovered.
The method comprises the steps of intelligently checking fixed values, checking the operation fixed values according to the current operation mode of a power grid, wherein the check of each level of switch cooperation refers to check of the protection cooperation rationality of a to-be-checked protection type circuit breaker and an upper level circuit breaker, and the check of a single switch is to check the single consistency of the to-be-checked circuit breaker and the required setting fixed values in a system, and the check of the operation fixed values comprises the check of each level of switch cooperation and the check of the single switch;
and (3) matching and checking all levels of switches: for the branch line differential protection type circuit breaker, determining an upstream primary circuit breaker of the circuit breaker to be checked according to the double names of the circuit breakers, acquiring a fixed value list of the circuit breaker, analyzing the fixed value list, capturing the protection fixed values of all settings, comparing the fixed value list with the fixed value list, combining the existing fixed value setting rules, reminding setting abnormal items of the circuit breaker to be checked, outputting a checking result, and supporting an analysis document derivation function so as to facilitate manual analysis of relay protection personnel.
Under normal mode and under special operation mode, as shown in fig. 5, the 10kV a line is provided with 6 self-configured circuit breakers, namely FA1, FA2, FA3, FA4, FA5 and FA6, wherein FA1, FA2 and FA3 are voltage time type sectionalizing switches, FA4 and FA6 are branch line level difference protection type switches, FA5 is a tie switch (non-throwing function), the 10kV b line is provided with 4 self-configured circuit breakers, namely FA1, FA2, FA3 and FA4, wherein FA1 and FA2 are voltage time type sectionalizing switches, and FA3 and FA4 are branch line level difference protection type switches. Due to the adjustment of the operation mode, the 10kV A line is provided for a 10kV B line FA4 switch back-end line, the 10kV A line FA4 and 10kV B line FA4 level difference protection type self-switching protection fixed value may not meet the current operation mode, the 10kV A line FA4 switch and the CB1 switch fixed value are required to be checked, the 10kV B line FA4 switch and the 10kV A line FA4 switch fixed value and the CB1 switch fixed value are required to be checked, the method comprises the steps of checking the over-current I section fixed value, the over-current I section time, the over-current III section fixed value, the over-current III section time, the zero-sequence over-current I section fixed value, the zero-sequence over-current I section time, the zero-sequence over-current II section fixed value and the zero-sequence over-current II section time according to the XX power supply fixed value setting principle, and outputting a checking result, alarming and prompting abnormal items and providing reasonable matching fixed values.
The CT ratio of the 10kV A line CB1 breaker is 600/5, two-phase current protection (a quick break fixed value 3000A, a quick break fixed value 0.2s; an overcurrent fixed value 840A, an overcurrent fixed value 1 s) and one-phase zero-sequence current protection (a zero-sequence I fixed value 100A, a zero-sequence I fixed value 1 s) are provided, the original fixed value of the 10kV A line FA4 breaker is in matching relation with CB1, two-phase current protection (a quick break fixed value 2000A, a quick break fixed value 0s; an overcurrent fixed value 500A, an overcurrent fixed value 0.7 s) and one-phase protection (a zero-sequence I fixed value 45A, a zero-sequence I fixed value 0.7 s) are provided, the original fixed value of the 10kV B line FA4 breaker is provided with two-phase current protection (a quick break fixed value 2000A, a zero-sequence I fixed value 0s; an overcurrent fixed value 500A, an overcurrent fixed value 0.7 s) and one-phase protection (a zero-sequence I fixed value 45A, a zero-sequence I fixed value 0.7 s; an overcurrent fixed value 500A, an overcurrent fixed value 4A, a value 4A and an overcurrent fixed value 4A) are provided, and an abnormal value is provided, and the two-phase current protection is provided by the two-phase current protection (a fixed value 4A, the three-phase current protection is provided with the three-phase current protection (0.7A, the zero-phase current protection and the current protection is provided with the phase current protection). The quick break fixed value 1800A, the quick break time limit 0s, the overcurrent fixed value 300A, the overcurrent fixed value 0.6s, the zero sequence I section fixed value 40A and the zero sequence I section fixed value 0.6s.
Single switch check: the single switch check is to check the consistency of the current operation fixed value and the single fixed value to be checked, because the operation environment of the protection device is complex, under certain environments, jump of the operation fixed value of the protection device can be caused, the operation fixed value is inconsistent with one or more fixed values of the single fixed value to be checked, a recall command is issued regularly through a master station, the current operation fixed value of the circuit breaker is collected, encrypted and packaged and then sent to the master station, the master station acquires the current real-time operation fixed value of the circuit breaker to be checked through remote sensing and remote signaling, the operation fixed value is compared with each fixed value of the single fixed value to be checked by an OCS fixed value check module of the distribution network, and an alarm is given out to find out an abnormal item (inconsistent item), so that relay protection personnel can find out a problem quickly, reset the abnormal item fixed value in time and ensure the reliable operation of the protection device.
And managing the fixed value historical data, and forcedly generating a corresponding operation record for fixed value modification so as to inquire the fixed value modification record and facilitate later responsibility following, and archiving and storing the fixed value list in a system after each modification to form a fixed value list historical database.
And a fixed value list management system is established in the power distribution automation master station system, and information such as fixed value list version numbers, setting time and the like is stored, so that staff can conveniently review and check the fixed value list. And the fixed value modification operation is forcedly generated into a corresponding operation record so as to inquire the fixed value modification record and facilitate later-stage responsibility following. The current operation fixed value of the circuit breaker can be checked through the circuit breaker interval diagram, so that operators, protectors and dispatchers can quickly check the fixed value of the circuit breaker.
The automatic generation module of the fixed value list executes the following steps:
step one, automatically acquiring a 10kV line latest pattern and related equipment parameters according to SVG single line pattern files and an OCS (distribution network) system, wherein the parameters comprise equipment information such as cable length, cable model, overhead line length, overhead line model, line total length, transformer capacity, self-distribution breaker model, self-distribution breaker CT, PT transformation ratio and the like of the line and a substitute line, and associating corresponding equipment with each parameter of each primary equipment such as overhead wires, cables and transformers to form an equipment parameter database of the line;
step two, generating a device topology network model according to the connection relation among devices and the device parameters of the line in the device parameter database;
according to the topology network model, according to the existing fixed value setting calculation principle, setting the reclosing time limit according to the type of the breaker, and correspondingly generating a protection fixed value list to be set self-configured to the breaker.
The system also comprises a voltage-time circuit tuning principle and a current level difference circuit tuning principle, wherein the voltage-time circuit tuning principle comprises a main line voltage-time tuning principle and a branch line current level difference type protection tuning principle, and the main line voltage-time tuning principle, the branch line current level difference type protection tuning principle and the current level difference type circuit tuning principle comprise quick break protection, overcurrent protection and zero sequence overcurrent protection.
Main line voltage-time setting principle: the voltage-time type switch time delay is set according to a unified principle, the first stage switch time delay of the outbound input voltage-time type logic is set according to X time limit 42 seconds, Y time limit 5 seconds and Z time limit 0.8 seconds in a normal operation mode, and each stage is set according to X time limit 7 seconds, Y time limit 5 seconds and Z time limit 0.8 seconds afterwards, as shown in figure 3:
1.1.1X, the delay time (X time) of the first-stage switch input voltage-time logic is set at 42 seconds, and the circuit breakers at the later stages are set at 7 seconds;
1.1.2Y, the closing confirmation time (Y time) of each stage of switch is 5 seconds;
1.1.3Z, setting the power-off switching-off delay time (Z time) of a 10kV outlet wire of a 110kV (35 kV) transformer substation to be 0.8 second;
1.1.4 if the branch adopts a voltage time type sectionalizer, then the trunk after the branch must not adopt a voltage time type breaker, otherwise the branch breaker will be mismatched with the trunk circuit breaker after the branch. If only the first circuit breaker of the branch adopts a voltage time type, the trunk line of the rear section of the branch still adopts the voltage time type, and the incoming closing time of the circuit breaker needs to be increased;
1.1.5 is put into zero-voltage switching-off function, the constant value of zero-sequence voltage uniformly takes a secondary value of 15V, and the time is 0.3s;
the 1.1.6 voltage time type circuit breaker has the function of switching on and switching off the logic acceleration trip, and the current fixed value is matched with the side quick-break protection or the overcurrent protection of the transformer substation. In general, if the three-phase short-circuit current calculated by the installation point is larger than the fixed value of the quick-break current at the side (or a switch station) of the transformer substation, if the quick-break is 3000A, the three-phase short-circuit current can be set according to 2400A, the quick-break is smaller than 3000A, the small value in the two-phase short-circuit current of the installation point can be set according to the quick-break value/1.1 and 0.9 times, the time limit is 0s, if the three-phase short-circuit current calculated by the installation point is smaller than the fixed value of the quick-break current at the side (or the switch station), the fixed value can be set according to the over-current acceleration value/1.2, the fixed value can be set according to the load at the back stage of the short-circuit, and the time limit is set to be (the over-current time at the side of the transformer substation-0.1 or 0.2) s;
1.1.7 voltage time type circuit breaker has the function of switching on and off in zero current, put into switching on and off in zero sequence overcurrent, zero sequence overcurrent fixed value cooperate with side zero sequence overcurrent protection of the transformer substation, the station proposal of the small-resistance grounding mode sets 50A, time limit 0.7s; the low-current line selection station can be generally set to 3A and 2.5s, but the zero-sequence current fixed value needs to be properly adjusted by combining the lengths of line cables and overhead lines;
1.1.8 reclosing function exits.
1.2 branch line current level differential protection setting principle
The quick break fixed value is set according to the short-circuit current condition of a specific fault point, and the overcurrent protection is set by taking the factors of power supply conversion, actual load, fuses and the like into consideration. The zero sequence protection is set according to the difference of the small-resistance grounding station and the small-current line selection station.
110kV transformer substation outgoing line
The protection fixed value of the 10kV outgoing line breaker of the 110kV transformer substation is set according to the following principle:
(1) Quick break protection
The quick-break protection mainly comprehensively considers that the breaker installed at the position has a certain protection range, ensures that the circuit is not over-level to the transformer substation under the condition of line fault, and the setting value of the quick-break protection is related to the magnitude of the bus impedance of the transformer substation. Aiming at the condition that part of large-capacity transformers or large-scale power supply cells exist and are closer to a transformer substation, the rapid breaking current protection can properly improve the action value in order to avoid the branch line faults with more large-capacity transformers, but the fixed value is not larger than 2700A at maximum, and the rapid breaking current protection needs to be adjusted if other special conditions exist.
The specific setting time is set according to the following principle:
1) And matching and setting the quick-break protection fixed value of the side line protection of the transformer substation. The branch circuit breaker of 110kV transformer substation outgoing line is generally not more than 2400A. The principle is satisfied for all branch breakers.
2) And setting a certain protection range according to the fault current calculation condition of the installation position. Under the condition of meeting the requirement of matching with a transformer substation, the calculation should be generally adopted for accurately playing a role in protection. The general principle is that the system takes equivalent impedance under the normal operation mode, the line overhead line calculates three-phase and two-phase short-circuit current of the position of the circuit breaker according to 0.4 ohm/km, and under the condition of the two-phase short-circuit current, a fixed value is used for setting the protection range of 15-25 bar faults behind the circuit breaker. In general, the two-phase fault current can be simplified to be about 200A directly subtracted when 2400-2000A is adopted, 150A directly subtracted when 2000-1500A is adopted, about 100A directly subtracted when 1500-1000A is adopted, and the multiple is 0.9 times when 1000A is adopted.
3) And the fault setting of the low-voltage side of the maximum supplied transformer is avoided (the coefficient of avoidance is at least 1.3 multiplied by 1.1), so that the fault of the low-voltage side is ensured not to trip out of order, namely the fault of the low-voltage side of a customer is not caused to go out of the door, and the branch circuit breaker is prevented from functioning as a lightning arrester.
4) Consider that the lower level fuses can function to isolate the fault settings. The lower level fuse can be blown at around 40ms under 1000A fault current conditions, so the value can be set to 1200-1000A.
All the above principles must be satisfied in cases where the 1 st and 2 nd values are small (i.e., the minimum value of the constant values obtained in 1 st and 2 nd) are satisfied, then 3) -4) can be considered.
If the time of quick break protection is 0.1s for a transformer substation, the branch line first stage is set according to 0s, the transformer substation is 0.2s, and the branch line first stage can be set according to 0s or 0.1 s.
For branch or trunk terminals farther from the substation, such as three-phase short-circuit currents of less than 2000A, the current can be set for 0.2s, and the maximum length should not exceed 0.3s.
(2) Overcurrent protection
The specific setting time is set according to the following principle:
1) And matching and setting the overcurrent protection fixed value of the transformer substation side line protection. The branch circuit breaker of 110kV transformer substation outgoing line is not more than 600A in general, and 720A in special cases. The principle is satisfied for all branch breakers.
2) Calculated according to the load supplied after the installation position. Under the condition that the number of the transformers is more than 10, the reliability coefficient can be 1. Under the condition of more than 5 transformers, the reliability coefficient can be taken to be 1.3-1.5 under the condition of 1.2,2-5 transformers, 2 under the condition of single transformer, and the special supply for pumping water or the branch line with a larger motor start can be considered according to 4 times of capacity.
3) And setting according to the consideration of the satisfaction of the transfer load. When the transfer line is in a transfer state, the transfer load requirement is generally considered to be met, and a fixed value/1.2 at the side of the transformer substation can be taken, for example, the fixed value can be properly reduced when the load of the transfer line is determined to be low.
4) Consider that the lower level fuses can function to isolate the fault settings. The lower level fuse can be blown at about 0.3s under 300A fault current conditions, so the constant value can be set to 240-360A.
5) In general, the value of the overcurrent constant should not be lower than 60A, and it is recommended that the value be as high as 120A or more. Over-current protection generally takes into account a margin to meet the demand for subsequent load increases.
All the above principles have to be satisfied in the first case in order to consider 2) -5).
(3) Zero sequence overcurrent protection
The circuit breakers on the line column of the 10kV outgoing line are all configured with zero-sequence overcurrent protection, and the zero-sequence overcurrent protection is mainly considered to be matched with the zero-sequence overcurrent protection of the upper-level substation, and the typical fixed value of the outgoing line of the small-resistance grounding station is shown in the following table.
Figure BDA0003383166720000111
Figure BDA0003383166720000121
The 110kV transformer substation adopts a 10kV branch line (or end-station current-throwing protection) of a low-current grounding station, the zero-sequence overcurrent protection is considered to reduce the side line selection tripping and permanent fault full line power failure or partial main line power failure of the transformer substation, the pure overhead line branch line is set according to the reference fixed value of the following table, and the overhead cable mixed branch line needs to consider the capacitance and current influence of the cable line and properly increase the fixed value. Zero sequence protection cannot guarantee that the system can act, and is only one attempt means of the current Kunming power grid.
Figure BDA0003383166720000122
The specific setting time is set according to the following principle:
1) The branch line is connected with other lines, and the situation that the branch line is used for grounding other 10kV outgoing lines of the transformer substation under the condition of other lines is considered to avoid misoperation. At this time, the zero sequence current is 1.5-2 times of the sum of the branch line capacitance current and the capacitance current of the transferred line.
2) When the branch line is not connected with other lines, only the capacitance current of the branch line is considered to be avoided, and the branch line which is not more than 20km generally can adopt a primary value of 2A, and the zero sequence current must be a special zero sequence CT.
The zero sequence current protection time is 2.5s for the end station of the main line, 2s for the first stage of the branch line, and then 0.2s level difference matching is adopted step by step.
1.2.2 Outlet line of 35kV transformer substation
The protection fixed value of the 10kV outgoing line breaker of the 35kV transformer substation is set according to the following principle.
(1) Quick break protection
The specific setting time is set according to the following principle:
1) And the branch circuit breaker of the outlet line of the 35kV transformer substation cannot exceed a transformer substation constant value I dZ1/1.1 in cooperation with the quick-break protection constant value of the transformer substation side line protection. The principle is satisfied for all branch breakers.
2) The fault current calculation condition according to the installation position has a certain protection range. Under the condition of meeting the requirement of matching with a transformer substation, the calculation should be generally adopted for accurately playing a role in protection. The general principle is that the system takes equivalent impedance under the normal operation mode, the line overhead line calculates three-phase and two-phase short-circuit current of the position of the circuit breaker according to 0.4 ohm/km, and under the condition of the two-phase short-circuit current, a fixed value is used for setting the protection range of 15-25 bar faults behind the circuit breaker. In general, the two-phase fault current can be simplified to be about 200A directly subtracted when 2400-2000A is adopted, 150A directly subtracted when 2000-1500A is adopted, about 100A directly subtracted when 1500-1000A is adopted, and the multiple is 0.9 times when 1000A is adopted.
3) And the fault setting of the low-voltage side of the maximum supplied transformer is avoided (the coefficient of avoidance is at least 1.3 multiplied by 1.1), so that the fault of the low-voltage side is ensured not to trip out of order, namely the customer fault is caused to go out of the door, and the branch breaker is prevented from playing the role of a lightning arrester.
4) Consider that a lower level fuse can function to isolate a fault. The lower level fuse can be blown at around 40ms under 1000A fault current conditions, so the value can be set to 1200-1000A. All the above principles must be satisfied in cases where the 1 st and 2 nd values are small (i.e., the minimum value of the constant values obtained in 1 st and 2 nd) are satisfied, then 3) -4) can be considered.
If the time of quick break protection is 0.1s for a transformer substation, the branch line first stage is set according to 0s, the transformer substation is 0.2s, and the branch line first stage can be set according to 0s or 0.1 s.
For branch lines or trunk line end stations far away from the transformer substation, if the three-phase short-circuit current of the installation position is smaller than 0.8 times of the speed-break value of the transformer substation, the current can be set according to 0.2s, and the longest current should not exceed 0.3s.
(2) Overcurrent protection
The specific setting time is set according to the following principle:
1) And the branch circuit breaker of the outlet line of the 35kV transformer substation cannot exceed the transformer substation fixed value IdZ 2/1.2 in cooperation with the overcurrent protection fixed value of the transformer substation side line protection. The principle is satisfied for all branch breakers.
2) Calculated according to the load supplied after the installation position. Under the condition that the number of the transformers is more than 10, the reliability coefficient can be 1. Under the condition of more than 5 transformers, the reliability coefficient can be taken to be 1.3-1.5 under the condition of 1.2,2-5 transformers, 2 under the condition of single transformer, and the special supply for pumping water or the branch line with a larger motor start can be considered according to 4 times of capacity.
3) When a line is transferred, the requirement of transferring load needs to be met, and a transformer substation side fixed value/1.2 is generally adopted.
4) Consider that a lower level fuse can function to isolate a fault. The lower level fuse can be blown at about 0.3s under 300A fault current conditions, so the constant value can be set to 240-360A.
5) In general, the value of the overcurrent constant should not be lower than 60A, and it is recommended to take the value to 120A as much as possible. Over-current protection generally takes into account a margin to meet the need for increased load for the next few years. The time is matched step by step, and the minimum matching time is 0.1s. All the above principles have to be satisfied in the first case in order to consider 2) -5).
(3) Zero sequence overcurrent protection
The circuit breakers on the line column of the 10kV outgoing line are all configured with zero-sequence overcurrent protection, the zero-sequence overcurrent protection is mainly considered to be matched with the zero-sequence overcurrent protection of the upper-level substation, and the typical fixed value of the outgoing line of the small-resistance grounding station is shown in a table 3. Small-resistance grounding station outgoing line zero sequence protection typical fixed value
Figure BDA0003383166720000131
Figure BDA0003383166720000141
The 10kV branch circuit of the low-current grounding station is adopted, and zero-sequence overcurrent protection is considered to be put into consideration so as to reduce the tripping of the side line selection of the transformer substation and the total line loss of permanent faults or the loss of partial trunk lines. The pure overhead line branch line is set according to the following table, and the overhead cable mixing branch line needs to consider the influence of the capacitance current of the cable line and properly increase the fixed value. Zero sequence protection cannot guarantee that the system can act, and is only one attempt means of the current Kunming power grid.
Figure BDA0003383166720000142
The specific setting time is set according to the following principle:
1) The branch line and other lines need to be considered, and when the branch line is used for other lines, misoperation does not occur when other outgoing lines of the 10kV transformer substation are grounded. At this time, the zero sequence current is 1.5-2 times of the sum of the branch line capacitance current and the capacitance current of the transferred line.
2) When the branch line is not connected with other lines, only the capacitance current of the branch line is considered to be avoided, and the branch line which is not more than 20km generally can take a value of 2A once. The end station of the main line (which is a special zero sequence CT) is 2.5s, the first stage of the branch line is 2s, the two stages are matched step by step, and the matched stage difference is 0.3s.
1.2.3 reclosure
The empty line branch line or the overhead cable mixed branch line of the first rack is suitable for being put into reclosing, and the reclosing time is uniformly set for 2 seconds. The guard return time was set to 30s.
The reclosing time of the second-stage circuit breaker of the branch line is prolonged and is generally set to 40s, and the protection reset time is set to 60s, so that the fault can be isolated through the matching of the reclosing time of the upper stage and the lower stage when the fault of the rear stage of the second circuit breaker is jumped to the first circuit breaker.
And the circuit breakers of the third stage and above of the branch line can still consider investment, and the reclosing time is set according to the reclosing time of the circuit breakers of the second stage. Under the condition, improper tripping of upper and lower level matching can be caused, but in consideration of the fact that transient faults are most, the reliability of power supply can be improved after reclosing is put into operation.
The reclosing of the client branch line demarcation circuit breaker is generally set according to the withdrawal, and the reclosing is indeed set according to the following principle by considering the conditions of long branch lines of partial users, more power supply equipment and the like and considering the improvement of the power supply reliability: the user branch line is directly connected with the trunk line and can be set according to 2 seconds, and the non-direct connection trunk line is set according to 60 seconds.
The reclosing of the branch line of the cable line needs to be withdrawn, and the reclosing of other conditions is withdrawn.
2. Current level differential circuit setting principle
2.1 10kV outgoing line current level difference circuit setting principle
(1) Quick break protection
The quick-break protection mainly comprehensively considers that the breaker installed at the position has a certain protection range, ensures that the circuit is not over-level to the transformer substation under the condition of line fault, and the setting value of the quick-break protection is related to the magnitude of the bus impedance of the transformer substation. The branch head circuit breaker in front of the trunk line first station is set according to the following principle.
1) And the branch circuit breaker of the 110kV transformer substation outgoing line is not more than 2400A under the general condition and the branch circuit breaker of the 35kV transformer substation outgoing line cannot be more than the transformer substation constant value IdZ1/1.1 in cooperation with the quick-break protection constant value of the transformer substation side line protection. The principle is satisfied for all branch breakers.
2) The fault current calculation condition according to the installation position has a certain protection range. Under the condition of meeting the requirement of matching with a transformer substation, the calculation should be generally adopted for accurately playing a role in protection. The general principle is that the system takes equivalent impedance under the normal operation mode, the line overhead line calculates three-phase and two-phase short-circuit current of the position of the circuit breaker according to 0.4 ohm/km, and under the condition of the two-phase short-circuit current, a fixed value is used for setting the protection range of 15-25 bar faults behind the circuit breaker. In general, the two-phase fault current can be simplified to be about 200A directly subtracted when 2400-2000A is adopted, 150A directly subtracted when 2000-1500A is adopted, about 100A directly subtracted when 1500-1000A is adopted, and the multiple is 0.9 times when 1000A is adopted.
3) And the fault setting of the low-voltage side of the maximum transformer is avoided (the coefficient of avoiding is at least 1.3), so that the fault of the low-voltage side is ensured not to trip out of order, namely the customer is caused to go out of the door, and the branch breaker is prevented from playing the role of a lightning arrester.
4) Consider that a lower level fuse can function to isolate a fault. The lower level fuse can be blown at around 40ms under 1000A fault current conditions, so the value can be set to 1200-1000A. If the time at the side of the transformer substation is 0.3s, the time can be set according to 0.2s, and if the time is 0.2s, the time can be set according to 0.1s, and if the time is 0.1s, the time can be set according to 0 s. I.e. the step difference can be set at 0.1 s.
All the above principles must be satisfied in cases where the 1 st and 2 nd values are small (i.e., the minimum value of the constant values obtained in 1 st and 2 nd) are satisfied, then 3) -4) can be considered.
The quick-break protection of other circuit breakers is set according to a certain protection range under the fault current of upper and lower levels of coordination and fault points. Take 2-4 values) and ensure the matching with the upper level.
(2) Overcurrent protection
The specific setting time is set according to the following principle:
1) The branch circuit breaker of 110kV transformer substation outgoing line is matched with the overcurrent protection fixed value of the transformer substation side line protection, and is not more than 600A under the general condition, and is not more than 700A under the special condition, and the branch circuit breaker of 35kV transformer substation outgoing line cannot exceed the transformer substation fixed value IdZ2/1.2. The principle is satisfied for all branch breakers.
2) Calculated according to the load supplied after the installation position. Under the condition that the number of the transformers is more than 10, the reliability coefficient can be 1. Under the condition of more than 5 transformers, the reliability coefficient can be taken to be 1.3-1.5 under the condition of 1.2,2-5 transformers, 2 under the condition of single transformer, and the special supply for pumping water or the branch line with a larger motor start can be considered according to 4 times of capacity.
3) When a line is transferred, the requirement of transferring load needs to be met, and a transformer substation side fixed value/1.2 is generally adopted.
4) Consider that a lower level fuse can function to isolate a fault. The lower level fuse can be blown at about 0.3s under 300A fault current conditions, so the constant value can be set to 240-360A.
5) In general, the value of the overcurrent constant should not be lower than 60A, and it is recommended to take the value to 120A as much as possible. Over-current protection generally takes into account a margin to meet the need for increased load for the next few years. The time is adjusted according to the matching of the circuit breaker with the current overcurrent protection, and the time level difference can be 0.1s.
All the above principles have to be satisfied in the first case in order to consider 2) -5).
(3) Zero sequence overcurrent protection
When the 110kV station and the 35kV station are grounded with small resistance, the circuit breakers on the line column of the 10kV outgoing line should be configured with zero sequence overcurrent protection, the zero sequence overcurrent protection is mainly considered to be matched with the zero sequence overcurrent protection of the upper-level substation,
typical constants are shown in the following table.
Figure BDA0003383166720000161
When 110kV station and 35kV station are small current grounding line selection, zero sequence overcurrent protection is considered to reduce transformer station side line selection tripping and permanent fault full line power failure or partial main line power failure. The pure overhead line branch line is set by referring to the table set value below, and the overhead cable mixed branch line needs to consider the influence of capacitance and current of the cable line and properly increase the set value. Zero sequence protection cannot guarantee that the system can act, and is only one attempt means of the current Kunming power grid.
Figure BDA0003383166720000162
The specific setting time is set according to the following principle:
1) The branch line and other lines need to be considered, and when the branch line is used for other lines, misoperation does not occur when other outgoing lines of the 10kV transformer substation are grounded. At this time, the zero sequence current is 1.5-2 times of the sum of the branch line capacitance current and the capacitance current of the transferred line.
2) When the branch line is not connected with other lines, only the capacitance current of the branch line is considered to be avoided, and the branch line which is not more than 20km generally can take a value of 2A once. (must be a dedicated zero sequence CT)
The first stage of the trunk line adopts 2.6s, the second stage adopts 2.4s, the third stage of the trunk line adopts 2.2s, the first stage of the branch line adopts 2s, the first stage of the branch line is matched step by step, and the matched level difference adopts 0.2s.
2.2 reclosing setting principle
The main line breaker and the empty cable mixing branch line of the front branch main line are suitable for switching on and switching off, and the reclosing time is uniformly set for 2 seconds. The guard return time was set to 30s.
The reclosing time of the non-main trunk circuit breaker and the branch head station in front of the non-main trunk circuit breaker is prolonged, and is generally set to 40s, and the protection and restoration time is set to 60s, so that the fault can be isolated by matching the upper and lower reclosing time when the fault of the rear section of the second circuit breaker is jumped to the first circuit breaker in an override mode.
And the circuit breakers of the third stage and above can still consider investment, and the reclosing time is set according to the reclosing time of the circuit breakers of the second stage. Under the condition, improper tripping of upper and lower level matching can be caused, but in consideration of the fact that transient faults are most, the reliability of power supply can be improved after reclosing is put into operation.
The reclosing of the client branch line demarcation circuit breaker is generally set according to the withdrawal, and the reclosing is indeed set according to the following principle by considering the conditions of long branch lines of partial users, more power supply equipment and the like and considering the improvement of the power supply reliability: the user branch line is directly connected with the trunk line and can be set according to 2 seconds, and the non-direct connection trunk line is set according to 60 seconds.
The reclosing of the branch line of the cable line needs to be withdrawn, and the reclosing of other conditions is withdrawn.
2.3 10kV outgoing line setting principle of 10kV switching station
The current level difference setting principle is the same as that of a 10kV head trunk circuit breaker.
Table 1: fixed value single template of Beijing family sharp manufacturer type circuit breaker
Figure BDA0003383166720000171
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Figure BDA0003383166720000181
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Figure BDA0003383166720000191
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Figure BDA0003383166720000201
Table 2: fixed value single template for eastern electronic manufacturer type circuit breaker
Figure BDA0003383166720000202
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Figure BDA0003383166720000211
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Figure BDA0003383166720000221
Table 3: protection constant value sheet for 10kV large-cable 58.1+1 rod A01 circuit breaker
Figure BDA0003383166720000222
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Figure BDA0003383166720000231
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Figure BDA0003383166720000241
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (4)

1. The utility model provides a terminal fixed value remote modification system for 10kV circuit distribution switch, is based on distribution network OCS system basic platform, its characterized in that, terminal fixed value remote modification system is including application layer, calculation service layer, the data buffer layer that lays according to logical framework top-down, data buffer layer logical framework lower floor lays, application layer logical framework upper strata lays visual man-machine interface, and disposes in distribution network OCS system basic platform's safe I district, acquires and stores protection fixed value, remote signaling telemetering, electric wire netting model, electric wire netting figure, real-time status's data through distribution network OCS system basic platform, demonstrates fixed value calculation, check result, auxiliary analysis result, fixed value remote modification result through visual man-machine interface, terminal fixed value remote modification system still includes:
the terminal fixed value remote modification system acquires the latest SVG single line drawing file from the GIS system, combines the data of the base platform of the distribution network OCS system, acquires the equipment parameters related to the distribution network from the latest SVG single line drawing file, and the equipment parameters comprise the basic parameter data of the 10kV line, the cable of the supplied line, the overhead line, the total length of the line, the transformer and the circuit breaker related distribution network equipment, and stores the basic parameter data into the terminal fixed value remote modification system database to derive the basic parameter data of single or multiple equipment;
And (3) managing the equivalent impedance of the system: the method comprises the steps of importing basic parameter data to system equivalent impedance of 10kV lines of a 110kV transformer substation, a 35kV transformer substation and a 10kV switch station, and providing basic operations of adding, modifying and deleting corresponding basic parameter data;
matching relationship topology association management: realizing intelligent analysis of the coordination relationship, acquiring corresponding equipment parameter data, realizing intelligent generation of a simplified diagram of a simple equipment connection relationship according to a single line diagram, supporting editing operation of a corresponding topological relationship diagram, respectively calculating impedance parameters of an electric element according to the topological relationship diagram and equipment basic parameter information, and generating a topological network model;
and (3) managing a fixed value checking rule base: the fixed value checking rules are managed, and the fixed value rules can be added, modified and deleted;
and (3) setting value intelligent setting calculation: according to the topological network model and impedance parameters of all the electrical elements, intelligent automatic setting analysis is carried out on the protection equipment according to the existing setting value setting principle, and meanwhile, the number of stages of the off-station circuit breaker is automatically analyzed to carry out multistage coordination calculation;
the automatic generation module of the fixed value list: combining the fixed value calculated by the fixed value intelligent setting calculation module, selecting a corresponding fixed value single template according to the model of the protection device, the manufacturer and the position type of the circuit breaker and the existing setting rule, and automatically generating a fixed value single;
Fixed value remote modification function module: through the constant value remote modification function module, remote modification of the terminal protection constant value is realized from the power distribution automation master station;
and (3) fixed value intelligent checking: checking the operation fixed value according to the current operation mode of the power grid, wherein the matching check of each level of switch refers to the checking of the rationality of the protection matching of the protection type circuit breaker to be checked and the superior circuit breaker, and the check of the single switch refers to the checking of the consistency of the setting value required to be set in a remote modification system of the protection type circuit breaker to be checked and the terminal fixed value; the operation fixed value checking comprises the steps of matching check of all levels of switches and single switch check;
the fixed value history data management, namely forcibly generating a corresponding operation record for fixed value modification so as to inquire the fixed value modification record and facilitate later responsibility following, and archiving and storing the fixed value list in a terminal fixed value remote modification system after each modification to form a fixed value list history database;
the automatic generation module of the fixed value list executes the following steps:
step one, automatically acquiring a latest pattern of a 10kV line and relevant equipment parameters according to SVG single line pattern files and an OCS system foundation platform of a distribution network, wherein the latest pattern of the 10kV line and the relevant equipment parameters comprise the cable length, the cable model, the overhead line length, the overhead line model, the line total length, the transformer capacity, the distribution circuit breaker model, the distribution circuit breaker CT and PT transformation ratio equipment information, and associating corresponding equipment with each parameter of an overhead conductor, a cable and a transformer to form an equipment foundation parameter database of the 10kV line;
Step two, generating an equipment topology network model according to the connection relation among the equipment and the equipment basic parameters of the 10kV line in the equipment basic parameter database;
setting the reclosing time limit according to the existing fixed value setting calculation principle, namely setting the 'quick breaking value', 'quick breaking time limit', 'time limit quick breaking value', 'time limit quick breaking time limit', 'overcurrent value', 'overcurrent time limit', 'zero sequence I section constant value', 'zero sequence I section time limit', 'zero sequence overcurrent II section fixed value', 'zero sequence overcurrent II section time limit' for the reclosing function, and correspondingly generating a protection fixed value list to be set from the breaker according to the type of the breaker;
the remote modification of the terminal protection fixed value from the power distribution automation master station through the fixed value remote modification functional module specifically comprises the following steps: in a power distribution automation master station system, remote modification of terminal fixed values is realized through a master station issuing instruction, a relay protection device operation graph is drawn into a corresponding breaker interval graph, and the fixed value is modified by clicking a relay protection device graphic element to enter a fixed value remote modification editing page, wherein the method comprises the following steps of:
After logging in a distribution automation master station system, related staff inquires a circuit single line diagram of a circuit to be modified, enters a circuit interval diagram of the circuit to be modified through the single line diagram, and finds a protection device modification primitive;
step two, identity authentication is needed again when a relevant staff at the dispatching master station end enters a fixed-value remote modification editing page, whether the staff has operation authority is confirmed by verifying a user name and a password, and the staff can enter the fixed-value remote modification detail page after the staff has the operation authority;
step three, the constant value remote modification supports automatic identification of a constant value single value and filling into a constant value modification frame, or supports manual entry by entry;
step four, after confirming that the fixed value input is correct and checking is completed, submitting a fixed value remote modification operation application, wherein the operator needs to input a user name, a password and a breaker code to be modified again to confirm the operation, transmitting the confirmed result to a guardian for checking, and the guardian needs to input the user name, the password and the breaker code to be modified of the guardian, and checking the checking result after confirming that the fixed value is correct, so that the operator can remotely modify and preset the fixed value; the terminal fixed value remote modification system also comprises a voltage-time type circuit setting principle and a current level difference type circuit setting principle.
2. The remote terminal setpoint modification system for a 10kV line distribution switch of claim 1, wherein the voltage-time line tuning principle comprises a main line voltage-time tuning principle and a branch line current level differential protection tuning principle.
3. The system for remotely modifying the terminal constant value of a 10kV line distribution switch according to claim 2, wherein the main line voltage-time type setting principle, the branch line current level differential protection setting principle and the current level differential line setting principle comprise quick break protection, overcurrent protection and zero sequence overcurrent protection.
4. The system for remotely modifying the terminal constant value of a 10kV line distribution switch according to claim 1, wherein the system equivalent impedance management is to import basic data through a data interface, an Excel, a PDF import mode and a manual page record mode.
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