CN114243652A

CN114243652A - Terminal constant value remote modification system for 10kV line power distribution switch

Info

Publication number: CN114243652A
Application number: CN202111442403.8A
Authority: CN
Inventors: 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
Original assignee: Yunnan Power Grid Co Ltd
Current assignee: Yunnan Power Grid Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-03-25
Anticipated expiration: 2041-11-30
Also published as: CN114243652B

Abstract

The invention discloses a terminal constant value remote modification system for a 10kV line power distribution switch, which is based on a distribution network OCS system basic platform and comprises an application layer, a calculation service layer and a data buffer layer which are arranged from top to bottom according to a logic architecture, wherein the data buffer layer is arranged at the lower layer of the logic architecture, a visual human-computer interface is arranged at the upper layer of the logic architecture of the application layer and is arranged in a safety I area of the distribution network OCS system basic platform, and data of protection constant value, remote signaling remote measurement, a power grid model, a power grid graph and a real-time state are acquired and stored through the distribution network OCS system basic platform. According to the invention, the workload of calculating and checking the fixed value of the intelligent switch is reduced by 92%, the success rate of remote setting is 98.7%, 1809.6 times of fixed value modification work is saved, more than 67% of switch fixed value modification work of a base layer is reduced, the fixed value setting accuracy is improved from 85.4% of field personnel modification to more than 97% of main station remote modification, and the false alarm and the false operation of the self-switch are reduced by more than 21%.

Description

Terminal constant value remote modification system for 10kV line power distribution switch

Technical Field

The invention relates to the technical field of relay protection, in particular to a terminal constant value remote modification system for a 10kV line power distribution switch.

Background

The 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 calculation and the setting of the relay protection constant value directly determines the correctness of the relay protection action, but the calculation, the checking and the modification of the protection constant value of the current 10kV line switch (comprising a common switch and an intelligent switch) take a lot of manpower, so that not only a lot of time and energy of basic operation and maintenance personnel and relay management personnel are consumed, but also the higher correctness of the checking and the setting cannot be ensured, so that the relay protection constant value becomes one of hidden fault sources, the expansion of an accident can be caused during the fault, the analysis and the processing of the fault by a dispatcher and an operator are not facilitated, and the accident processing and the power restoration of a non-fault section are delayed.

The protection constant value calculation, check, modification and constant value single retrieval of the existing 10kV line switch have the following problems:

and (3) constant value calculation: the calculation work of the protection constant value is completed by the protection personnel related to each county and district office, and the following problems mainly exist: firstly, no corresponding post of part of county and district bureaus is specially used for carrying out protection work, so that the responsibility division is not clear; secondly, with the application and the promotion of distribution network self-healing, the setting of a protection constant value is more complicated; thirdly, the skill level of protection personnel engaged in each district and county bureau is uneven, the overall level is generally not high, and the fixed value setting level is to be improved;

and (3) fixed value checking: the fixed value checking work is carried out by submitting the calculated fixed value to a system relay room by each county and district office for auditing, and the following problems are mainly existed: firstly, because the distribution network equipment is huge in size, the protection fixed value quantity needing to be checked is large, and the fixed value checking needs to consume a large amount of time for relay room service personnel; secondly, the relay room has limited manpower resources, so that the relay room has relatively limited functions as the last defense line for checking the reasonability and correctness of the setting value, and the complete correctness of the setting value is difficult to ensure;

and (3) fixed value modification: the modification of the protection constant value needs to be operated by an operator to the field, and the following problems mainly exist: firstly, the distribution network is huge in size, operation and maintenance personnel undertake constant value modification work and heavy daily inspection, maintenance and other work, and the constant value modification work has a lagging condition; secondly, the geographical positions of operation and maintenance lines of part of county and district offices are remote, so that the transportation is inconvenient and the operation and maintenance difficulty is high; thirdly, the manpower resources of each operation unit are insufficient, and the personnel are difficult to coordinate with the scheduled maintenance, live working, fault emergency repair, daily inspection and other work and fixed value modification; fourthly, the skill level of operators in each unit is insufficient, so that the correctness of the switch constant value modification is difficult to ensure, and the working pressure of the unit constant value modification of each base layer is high;

and (5) setting a value list and reading: when a relay service person, a dispatcher and operation and maintenance personnel check the fixed value list, the fixed value list needs to be downloaded from another system, so that the operation is complex and time-consuming, and the work of related service personnel is inconvenient to develop.

Therefore, it is desirable to provide a corresponding terminal constant value remote modification system for 10kV line distribution switch 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 purpose, the invention adopts the following technical scheme:

the utility model provides a long-range modification system of terminal definite value for 10kV circuit distribution switch, based on join in marriage net OCS system foundation platform, the system is including the application layer, calculation service layer, the data buffer layer that lay according to logical framework top-down, data buffer layer logical framework lower floor is laid, visual man-machine interface is laid to application layer logical framework upper strata, and dispose in joining in marriage safe I district that net OCS system foundation platform, through join in marriage net OCS system foundation platform and acquire and save the data of protection definite value, telesignalling telemetering measurement, electric wire netting model, electric wire netting figure, real-time status, show definite value calculation, check result, supplementary analysis result, the long-range modification result of definite value through visual man-machine interface, the system still includes:

basic parameter data management, namely acquiring a latest SVG single line graph file from a GIS (geographic information System) by the system, acquiring relevant equipment parameters of a distribution network from the latest SVG single line graph file in combination with distribution network OCS (online charging system) system data, wherein the relevant equipment parameters comprise basic parameter data of cables, overhead lines, total line lengths, transformers, circuit breakers and other relevant distribution network equipment of the 10kV line and supplied lines, storing the basic parameter data into a system database, and deriving the basic data of single or multiple pieces of equipment;

managing system equivalent impedance, namely importing basic data to the system equivalent impedance of 10kV lines of a 110kV transformer substation, a 35kV transformer substation and a 10kV switch station, and providing basic operations such as addition, modification, deletion and the like of corresponding data;

matching relationship topological association management, realizing intelligent analysis of matching relationship, acquiring corresponding equipment parameter data, realizing intelligent generation of a simplified diagram of simple equipment connection relationship according to a single line diagram, supporting editing operation of the corresponding topological relationship diagram, respectively calculating impedance parameters of the electrical elements according to the topological relationship diagram and equipment parameter information, and generating a topological network model;

the constant value check rule library is used for managing the constant value check rules, and can perform addition, modification and deletion operations on the constant value rules;

performing fixed value intelligent setting calculation, and performing intelligent automatic setting analysis on the protection equipment according to the existing fixed value setting principle according to the topological network model and the impedance parameters of each electrical element;

and automatically generating a fixed value list, combining the fixed value calculated by the fixed value intelligent setting calculation module, selecting a corresponding fixed value list template according to the model and the manufacturer of the protection device and the position type of the circuit breaker and the existing setting rule, and automatically generating the fixed value list.

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 carrying out fixed value intelligent check, checking an operation fixed value according to the current operation mode of a power grid, checking the matching of switches at all levels, namely checking the protection matching rationality of a to-be-checked protection type circuit breaker and a superior circuit breaker, and checking a single switch by checking the to-be-checked circuit breaker and the single consistency of a set fixed value required in a system;

and (4) managing the fixed value historical data, wherein the fixed value modification is forced to generate a corresponding operation record so as to inquire the fixed value modification record, so that the fixed value modification record can be conveniently traced in later period, and after each modification, the fixed value list is filed and stored in the system to form a fixed value list historical database.

As a further description of the above technical solution:

the automatic constant value list generating module executes the following steps:

firstly, automatically acquiring a 10kV line latest drawing model and related equipment parameters according to an SVG single-line drawing file and a distribution network OCS system, wherein the latest drawing model and the related equipment parameters comprise equipment information of a line and a substitute line such as cable length, cable model, overhead line length, overhead line model, total line length, transformer capacity, self-circuit breaker model, self-circuit breaker CT (computed tomography) and PT (potential transformer) transformation ratio, and associating corresponding equipment with various parameters of various primary equipment such as overhead conductors, cables and transformers to form an equipment parameter database of the line;

step two, generating an equipment topology network model according to the connection relation between the equipment and the equipment parameters of the line in the equipment parameter database;

and thirdly, according to a topological network model and according to the existing fixed value setting calculation principle, setting the reclosing time limit of the reclosing function according to the quick-breaking fixed value, the quick-breaking time limit, the time-limited quick-breaking fixed value, the overcurrent fixed value, the zero-sequence fixed value I, the zero-sequence time limit I, the zero-sequence overcurrent fixed value II and the zero-sequence overcurrent time limit II, and correspondingly generating a protection fixed value list to be set and matched with the automatic circuit breaker according to the type of the circuit breaker.

As a further description of the above technical solution:

the system also comprises a voltage-time type circuit setting principle and a current step difference type circuit setting principle.

As a further description of the above technical solution:

in the system equivalent impedance management, basic data are imported through a data interface, an Excel and PDF import mode and an artificial page record mode.

As a further description of the above technical solution:

and automatically analyzing the stage number of the off-station circuit breaker in the intelligent setting calculation of the fixed value, and performing multi-stage matching calculation.

As a further description of the above technical solution:

and the operation fixed value is checked in the fixed value intelligent checking, wherein the checking comprises matching checking of switches at all levels and checking of a single switch.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

in the invention, the terminal constant value remote modification system comprises an application layer, a calculation service layer and a data buffer layer which are arranged from top to bottom according to a logic architecture, wherein a distribution network OCS system basic platform is arranged at the lower layer of the logic architecture of the data buffer layer, a visual human-computer interface is arranged at the upper layer of the logic architecture of the application layer, the subsystem is deployed in a safety I area of a distribution network OCS system basic platform, and acquires and stores data of a protection constant value, remote signaling and remote measuring, a power grid model, a power grid graph and a real-time state through the distribution network OCS system basic platform, constant value calculation, checking results, auxiliary analysis results and constant value remote modification results are displayed through a visual human-computer interface, through the realization of the functions of constant value calculation and check of the distribution automation main station, the workload of calculating and checking the constant value of the intelligent switch is reduced by 92 percent, the success rate of remote setting is 98.7 percent, 1809.6 people constant value modification work is saved, and more than 67 percent of switch constant value modification work of a basic level is reduced. In addition, the accuracy of setting the fixed value is improved from 85.4% of modification of field personnel to more than 97% of remote modification of the main station, and false alarm and misoperation of the self-switch are reduced by more than 21%.

Drawings

FIG. 1 is a diagram of a terminal-valued remote modification system architecture according to the present invention;

FIG. 2 is a functional block diagram of the system of the present invention;

FIG. 3 is a timing diagram of the main line voltage versus the timing of the time-based switch in accordance with the present invention;

FIG. 4 is a block diagram of an automatic constant value list generation module system according to the present invention;

fig. 5 is a distribution diagram of the 10kV line distribution self-breaker in the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1-4, a terminal constant value remote modification system for a 10kV line power distribution switch is based on a distribution network OCS system base platform, and the system includes an application layer, a computation service layer and a data buffer layer which are arranged from top to bottom according to a logic architecture, the data buffer layer is arranged on the lower layer of the logic architecture, a visual human-computer interface is arranged on the upper layer of the logic architecture of the application layer and is arranged in a security i area of the distribution network OCS system base platform, the fixed value, the remote signaling and remote measuring, a power grid model, a power grid graph and real-time data are acquired and stored through the distribution network OCS system base platform, and the fixed value computation, the check result, the auxiliary analysis result and the fixed value remote modification result are displayed through the visual human-computer interface, and the system further includes:

managing system equivalent impedance, namely importing basic data for the system equivalent impedance of 10kV lines of a 110kV transformer substation, a 35kV transformer substation and a 10kV switch station, providing basic operations such as addition, modification and deletion of corresponding data, and importing the basic data through a data interface, an Excel, PDF import mode and a manual page record mode;

the method comprises the steps of fixed value intelligent setting calculation, wherein intelligent and automatic setting analysis is carried out on protection equipment according to a topological network model and impedance parameters of each electrical element and the existing fixed value setting principle, and meanwhile, the off-station circuit breaker is automatically analyzed for the number of stages to carry out multi-stage matching calculation;

And the fixed value is remotely modified, the remote modification of the fixed value of the terminal protection 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 by issuing an instruction through the master station in a power distribution automation master station system. Drawing the operation graph of the relay protection device into a corresponding circuit breaker interval graph, and entering a constant value modification editing page to modify a constant value by clicking a graphic element of the protection device:

1. after logging in the distribution automation master station system, related workers inquire a single line diagram of a line to which the circuit breaker to be modified belongs, enter the interval diagram of the circuit breaker to be modified through the single line diagram, and find out the modified primitive of the protection device.

2. When the related staff of the dispatching master station enters the fixed value remote modification editing page, identity authentication is needed again, whether the staff has the operation authority or not is confirmed by verifying the user name and the password, and the staff can enter the fixed value modification detail page after having the operation authority.

3. The constant value modification supports automatic identification and filling of a constant value single constant value (PDF and Excel formats) into a constant value modification frame, and also supports manual entry item by item.

3. After confirming that the fixed value is correctly input and the check is finished without errors, the operator conducts fixed value remote modification operation application submission, the operator needs to input the user name, the password and the circuit breaker code to be modified again for operation confirmation, the operation confirmation is conducted after the verification is passed, the verification is sent to the guardian for verification, the guardian needs to input the user name, the password and the circuit breaker code to be modified, the verification is passed after the verification is passed, and the operator can conduct remote modification presetting.

3.1 long-range modification is preset, distribution automation main website issues the definite value modification instruction to the terminal of treating the modification promptly, after the terminal received the main website instruction, the analysis, check behind the data, will issue the definite value modification district that the definite value was put into the terminal, the terminal sends the main website after packing the definite value data in current definite value modification district, encrypt, the main website is analyzed, verify the data received, compare with the definite value list that the main website was assigned, confirm that terminal definite value modification district definite value data is unanimous after, feedback check result: if the presetting is successful, the modification can be cancelled. Otherwise, feeding back: the presetting fails;

3.2 after confirming that the presetting is successful, the operator clicks to execute, the automatic master station is matched to issue an execution command, the circuit breaker terminal to be modified receives the command of the master station, the fixed value of the fixed value modification area is led into the fixed value operation area, the protection function of the device is quitted in short time in the period, the protection outlet is blocked, and after the fixed value of the fixed value modification area is successful, the new fixed value is restarted, and the protection outlet is unblocked. The terminal feeds back a modification result to the master station: the execution is successful;

if the operation constant value solidification fails, the device alarms and locks, and feeds back a modification result to the main station: the execution fails;

after the execution of the fixed value fails, the specific instruction can be issued by the main station to reset the terminal, namely, the device is restarted to recover the fixed value.

The method comprises the steps of carrying out fixed value intelligent check, checking an operation fixed value according to the current operation mode of a power grid, checking the matching of switches at all levels, namely checking the protection matching rationality of a protection type circuit breaker to be checked and a superior circuit breaker, checking a single switch, namely checking the single consistency of a circuit breaker to be checked and a fixed value required to be set in a system, and checking the operation fixed value, wherein the checking of the switch at all levels comprises the matching check of the switches at all levels and the check of the single switch;

and (3) matching and checking of each stage of switches: for the branch line level difference protection type circuit breaker, a first-level circuit breaker at the upstream of a circuit breaker to be checked is determined according to the double names of the circuit breakers, a constant value list of the first-level circuit breaker is obtained, the constant value list is analyzed, various set protection constant values are captured, the constant value list and the constant value list are compared, the abnormal setting items matched with the circuit breaker to be checked are reminded by combining the existing constant value setting rule, the checking result is output, and the analysis document derivation function is supported, so that the relay protection personnel can analyze the abnormal setting items manually.

As shown in fig. 5, a 10kV first line is provided with 6 sets of self-breakers, which are respectively FA1, FA2, FA3, FA4, FA5 and FA6, wherein FA1, FA2 and FA3 are voltage time type section switches, FA4 and FA6 are branch line level difference protection switches, FA5 is a tie switch (non-throw function), a 10kV second line is provided with 4 sets of self-breakers, which are respectively FA1, FA2, FA3 and FA4, wherein FA1 and FA2 are voltage time type section switches, and FA3 and FA4 are branch line level difference protection switches. Due to the adjustment of the operation mode, the 10kV first line is provided with a 10kV second line FA4 switch rear-section line, the protection fixed value of the 10kV first line FA4 and the 10kV second line FA4 level difference protection type automatic switch may not meet the current operation mode, the fixed values of the 10kV first line FA4 switch and the CB1 switch are required to be verified, and the fixed values of the 10kV second line FA4 switch and the 10kV first line FA4 switch and the CB1 switch are verified, wherein the eight fixed values of 'overcurrent I section fixed value', 'overcurrent I section time', 'overcurrent III section fixed value', 'zero-sequence overcurrent I section time', 'zero-sequence overcurrent II section fixed value', 'zero-sequence overcurrent II section time' are subjected to fixed value matching verification according to the XX power supply local fixed value setting principle, a verification result is output, an abnormal item is subjected to alarm prompting, and a reasonable matching fixed value is provided.

The CT transformation ratio of the 10kV A-line CB1 circuit breaker is 600/5, the circuit breaker is provided with two-section phase current protection (a quick-break definite value of 3000A, a quick-break time limit of 0.2 s; an overcurrent definite value of 840A, an overcurrent time limit of 1s) and a zero-sequence current protection (a zero-sequence I definite value of 100A, a zero-sequence I time limit of 1s), the original definite value of the 10kV A-line FA4 circuit breaker has a matching relation with the CB1, the circuit breaker is provided with two-section phase current protection (a quick-break definite value of 2000A, a quick-break time limit of 0 s; an overcurrent definite value of 500A, an overcurrent time limit of 0.7s) and a zero-sequence protection (a zero-sequence I definite value of 45A, a zero-sequence I time limit of 0.7s) and the original definite value of the 10kV B-line FA4 circuit breaker is provided with two-section phase current protection (a quick-break definite value of 2000A, a quick-break time limit of 0 s; an overcurrent definite value of 500A, an overcurrent time limit of 0.7s) and a zero-sequence I time limit of 45A, a zero-sequence FA definite value of 4, when the 10kV A-line FA4 circuit breaker is unreasonable in cooperation with the FA definite value of 4, the checking result shows that the original set value of the 10kV B-line FA4 breaker is provided with two-stage phase current protection (quick-break set value 2000A, quick-break time limit 0 s; overcurrent set value 500A, overcurrent time limit 0.7s) to be abnormal, and the set value of the 10kV B-line FA4 breaker is recommended to be changed into: the quick-break constant value is 1800A, the quick-break time limit is 0s, the overcurrent constant value is 300A, the overcurrent time limit is 0.6s, the zero-sequence I section constant value is 40A, and the zero-sequence I section time limit is 0.6 s.

Checking a single switch: the single switch check is that the current operation fixed value and the fixed value to be set are checked in a single consistency mode, due to the fact that the operation environment of the protection device is complex, the operation fixed value of the protection device can be caused to jump under certain environments, the operation fixed value is inconsistent with one or more fixed values of the set fixed value issuing list, a recall instruction is issued regularly through a main station, the current operation fixed value of the circuit breaker is collected, encrypted and packaged and then sent to the main station, the main station obtains the current real-time operation fixed value to be checked and distributed from the circuit breaker through remote measurement and remote communication, the distribution network OCS system fixed value check module compares the operation fixed value with each fixed value of the set fixed value issuing list one by one, abnormal items (inconsistent items) are found to give an alarm, relay protection personnel can find problems quickly, the abnormal item fixed values are reset in time, and reliable operation of the protection device is guaranteed.

A fixed value list management system is established in the power distribution automation master station system, and information such as the fixed value list version number and setting time is stored, so that staff can conveniently read and check the information. And forcibly generating a corresponding operation record for the constant value modification operation so as to inquire the constant value modification record and facilitate the later tracing. The current operation constant value of this circuit breaker can be looked over to accessible circuit breaker interval diagram, and the constant value of this circuit breaker is looked over fast to operating personnel, protection personnel and dispatcher of being convenient for.

The system also comprises a voltage-time type circuit setting principle and a current step difference type circuit setting principle, wherein the voltage-time type circuit setting principle comprises a main line voltage-time type setting principle and a branch line current step difference type protection setting principle, and the main line voltage-time type setting principle, the branch line current step difference type protection setting principle and the current step difference type circuit setting principle comprise quick-break protection, overcurrent protection and zero-sequence overcurrent protection.

A main line voltage-time type setting principle: the voltage-time type switch time delay is set and set according to a unified principle, the first stage switch time delay of the voltage-time type logic of the station external outgoing line input in the normal operation mode is set according to X time limit 42 seconds, Y time limit 5 seconds and Z time limit 0.8 seconds, and later stages are set according to X time limit 7 seconds, Y time limit 5 seconds and Z time limit 0.8 seconds, as shown in fig. 3 specifically:

1.1.1X time limit, the time delay (X time) for switching on the incoming call of a first-stage switch with voltage-time type logic is set according to 42 seconds, and the circuit breakers at later stages are set according to 7 seconds;

1.1.2Y time limit, and the closing confirmation time (Y time) of each stage of switch is 5 seconds;

1.1.3Z time limit, setting the power-off brake-off delay time (Z time) of 10kV outgoing line of a 110kV (35kV) transformer substation to 0.8 second;

1.1.4 if the branch adopts the voltage time type sectional breaker, the main line after the branch can not adopt the voltage time type breaker, otherwise, the mismatch of the branch breaker and the main line breaker after the branch can be caused. If only the first branch circuit breaker adopts a voltage time type, the trunk line at the rear section of the branch line still adopts the voltage time type, and the incoming call closing time of the branch circuit breaker needs to be increased;

1.1.5 closing the zero-voltage brake-separating function, uniformly taking a secondary value of 15V for the zero-sequence voltage fixed value, and taking time of 0.3 s;

the 1.1.6 voltage time type circuit breaker has the function of logic accelerated tripping, and the function of logic acceleration, and the current constant value is matched with the side quick-break protection or overcurrent protection of the transformer substation. Generally, if the three-phase short-circuit current calculated by the installation point is larger than the fixed value of the quick-break current of the transformer substation side (or the switch station), if the quick-break is 3000A, the three-phase short-circuit current can be set according to 2400A, if the quick-break is smaller than 3000A, the small value of the quick-break fixed value/1.1 and 0.9 time of the two-phase short-circuit current of the installation point can be set, and if the three-phase short-circuit current calculated by the installation point is smaller than the fixed value of the quick-break current of the transformer substation side (or the switch station), the fixed value can be set according to (overcurrent fixed value/1.2) or set according to the load of a rear section, and the time limit is set to (the overcurrent time of the transformer substation side-0.1 or 0.2) s;

1.1.7 voltage time type circuit breaker has the function of switching on and switching off zero-current, and is switched on and switching off zero-sequence overcurrent, the zero-sequence overcurrent constant value is matched with zero-sequence overcurrent protection at the side of a transformer substation, the station is recommended to be set to be 50A in a low-resistance grounding mode, and the time limit is 0.7 s; the small-current line selection station can be generally set to be 3A and 2.5s, but the zero-sequence current fixed value needs to be properly adjusted by combining the lengths of the line cable and the overhead line;

1.1.8 reclosing function quit.

1.2 Branch line Current level difference type 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 considering factors such as power supply, actual load, a fuse and the like. The zero sequence protection is set according to the difference between a small resistance grounding station and a small current route selection station.

Outgoing line of 110kV transformer substation

The protection fixed value of the 10kV outgoing line external circuit breaker of the 110kV transformer substation is set according to the following principle:

(1) quick-break protection

The quick-break protection mainly and comprehensively considers that the circuit breaker installed at the position has a certain protection range, the circuit breaker is ensured not to step over to a transformer substation under the condition of line fault, and the setting value of the quick-break protection is related to the bus impedance of the transformer substation. Aiming at the condition that a part of large-capacity transformers or large-scale power supply cells exist and are close to a transformer substation, the action value can be properly improved by the quick-break current protection in order to avoid branch line faults with more large-capacity transformers, but the fixed value is not larger than 2700A at most, and the quick-break current protection needs to be put on record and adjusted in other special conditions.

The specific setting timing needs to be set according to the following principle:

1) and the quick-break protection constant value is matched and set with the quick-break protection constant value of the line protection at the transformer substation side. The branch circuit breaker of the outgoing line of the 110kV transformer substation does not exceed 2400A under the general condition. This principle must be satisfied for all branch breakers.

2) And a certain protection range is set under the condition of fault current calculation according to the installation position. Under the condition of meeting the requirement of being matched with a transformer substation, the method is generally used for calculating for accurately playing a protection role. The general principle is that the system takes equivalent impedance in a normal operation mode, three-phase and two-phase short-circuit currents of the position of the breaker are calculated by the overhead line of the line according to 0.4 omega/kilometer, and under the condition of the two-phase short-circuit currents, a fixed value has a protection range for 15-25 pole faults behind the breaker. Generally, the two-phase fault current can be directly subtracted by about 200A in 2400-2000A, directly subtracted by about 150A in 2000-1500A, directly subtracted by about 100A in 1500-1000A, and multiplied by 0.9 in 1000A or below.

3) The fault setting of the low-voltage side of the maximum transformer which is supplied is avoided (the avoiding coefficient is at least 1.3 multiplied by 1.1), the low-voltage side is ensured not to trip out step by step when the fault occurs, namely, the fault of the low-voltage side of a client is not caused to go out of the door, and the branch circuit breaker is prevented from playing the role of a lightning arrester.

4) The lower-level fuse is considered to be capable of achieving fault isolation setting. The lower stage fuse can typically blow at around 40ms in the event of a 1000A fault current, so the constant value can be set to 1200-1000A.

All the above principles must satisfy the condition that the number of items 1 and 2 is small (i.e. the minimum value of the constant values obtained by items not more than 1 and 2 is satisfied), and then items 3 to 4) can be considered.

If the time of the quick-break protection is 0.1s, the first branch line level is set according to 0s, the transformer substation is 0.2s, and the first branch line level 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 is less than 2000A, the three-phase short-circuit current can be set according to 0.2s, and the longest short-circuit current should not exceed 0.3 s.

(2) Overcurrent protection

1) and the overcurrent protection constant value is matched and set with the overcurrent protection constant value of the line protection at the side of the transformer substation. The branch circuit breaker of the outgoing line of the 110kV transformer substation does not exceed 600A under the general condition, and can not exceed 720A under the special condition. This principle must be satisfied for all branch breakers.

2) Calculated according to the load supplied after the installation position. If 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 1.2, under the condition of 2-5 transformers, the reliability coefficient can be 1.3-1.5, under the condition of single transformer, the reliability coefficient can be 2, and a branch line specially used for pumping water or having a larger motor for starting can be considered according to 4 times of capacity.

3) And the transfer load setting is satisfied according to the consideration. When the transfer line is generally considered to meet the load requirement of the transfer line, the fixed value/1.2 of the side of the transformer substation can be taken, and if the load of the transfer line is determined to be low, the fixed value can be properly reduced.

4) The lower-level fuse is considered to be capable of achieving fault isolation setting. The lower stage fuse can typically blow at around 0.3s in the event of a 300A fault current, so the constant value can be set to 240-360A.

5) Generally, the over-current fixed value is not lower than 60A, and is preferably 120A or more. Overcurrent protection generally takes into account a certain margin to meet the demand for subsequent load increases.

All the above principles must be satisfied in the first case, so that the bars 2) to 5) can be considered.

(3) Zero sequence overcurrent protection

Zero-sequence overcurrent protection is required to be configured on the circuit post breakers of 10kV outgoing lines, the zero-sequence overcurrent protection is mainly considered to be matched with the zero-sequence overcurrent protection of a superior transformer substation, and typical constant values of the outgoing lines of the small-resistance grounding transformer substation are shown in the following table.

A10 kV branch line (or a terminal current-throwing type protection) of a low-current grounding station is adopted in a 110kV transformer substation, zero-sequence overcurrent protection is considered to be thrown to reduce side line selection tripping of the transformer substation and permanent fault full-line power loss or partial main line power loss, a pure overhead line branch line is set according to a reference fixed value of the following table, and an overhead cable mixed branch line needs to consider the influence of capacitance current of a cable line and appropriately increase the fixed value. Zero sequence protection can not guarantee to be capable of acting, and is only an attempt means of the current Kunming power grid.

1) when the branch line is communicated with other lines, the fault operation does not occur when the other 10kV outgoing lines of the transformer substation are grounded under the condition that the branch line is supplied to other lines. At the moment, 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, generally the branch line which does not exceed 20km can adopt a first value of 2A, and the zero sequence current must be special zero sequence CT.

And in zero sequence current protection time, the final station of the main line is used for 2.5s, the first stage of the branch line is used for 2s, and then 0.2s step difference coordination is adopted step by step.

1.2.235 kV substation outlet line

The protection constant value of the 10kV outgoing line external circuit breaker of the 35kV transformer substation is set according to the following principle.

(1) Quick-break protection

1) and in cooperation with the quick-break protection fixed value of the line protection at the transformer substation side, the branch circuit breaker of the outgoing line of the 35kV transformer substation cannot exceed the transformer substation fixed value I dZ 1/1.1. This principle must be satisfied for all branch breakers.

2) There is a certain protection range under the condition of fault current calculation according to the installation position. Under the condition of meeting the requirement of being matched with a transformer substation, the method is generally used for calculating for accurately playing a protection role. The general principle is that the system takes equivalent impedance in a normal operation mode, three-phase and two-phase short-circuit currents of the position of the breaker are calculated by the overhead line of the line according to 0.4 omega/kilometer, and under the condition of the two-phase short-circuit currents, a fixed value has a protection range for 15-25 pole faults behind the breaker. Generally, the two-phase fault current can be directly subtracted by about 200A in 2400-2000A, directly subtracted by about 150A in 2000-1500A, directly subtracted by about 100A in 1500-1000A, and multiplied by 0.9 in 1000A or below.

3) The fault setting of the low-voltage side of the maximum transformer which is supplied is considered to be avoided (the avoiding coefficient is at least 1.3 multiplied by 1.1), the condition that the low-voltage side does not trip step by step when the fault occurs is ensured, namely, the fault of a client is caused to go out of the door, and the branch circuit breaker is prevented from playing the role of a lightning arrester.

4) Consider that the subordinate fuse can play a role in isolating faults. The lower stage fuse can typically blow at around 40ms in the event of a 1000A fault current, so the constant value can be set to 1200-1000A. All the above principles must satisfy the condition that the number of items 1 and 2 is small (i.e. the minimum value of the constant values obtained by items not more than 1 and 2 is satisfied), and then items 3 to 4) can be considered.

For branch lines or trunk line end stations far away from the transformer substation, if the three-phase short-circuit current at the installation position is less than 0.8 time of the quick-break fixed value of the transformer substation, the three-phase short-circuit current can be set according to 0.2s, and the longest short-circuit current is not more than 0.3 s.

(2) Overcurrent protection

1) and in coordination with the overcurrent protection constant value of the line protection at the transformer substation side, the branch circuit breaker of the outgoing line of the 35kV transformer substation cannot exceed the transformer substation constant value I dZ 2/1.2. This principle must be satisfied for all branch breakers.

3) When the line is transferred, the load requirement is generally considered to be met, and the fixed value/1.2 of the side of the transformer station can be generally taken.

4) Consider that the subordinate fuse can play a role in isolating faults. The lower stage fuse can typically blow at around 0.3s in the event of a 300A fault current, so the constant value can be set to 240-360A.

5) Generally, the over-current fixed value is not lower than 60A, and 120A is recommended to be achieved as much as possible. Overcurrent protection generally takes into account a certain margin to meet the demand for increased load in the following years. The time is matched step by step, and the minimum matching time can be 0.1 s. All the above principles must be satisfied in the first case, so that the bars 2) to 5) can be considered.

(3) Zero sequence overcurrent protection

Zero-sequence overcurrent protection is required to be configured on the circuit post breakers of the 10kV outgoing lines, the zero-sequence overcurrent protection is mainly considered to be matched with the zero-sequence overcurrent protection of the upper-level transformer substation, and the outgoing line typical constant values of the small-resistance grounding substation are shown in a table 3. Typical fixed value of zero sequence protection of outlet wire of small resistance grounding station

A10 kV branch line of a small-current grounding station is adopted, and zero-sequence overcurrent protection is considered to be put into use so as to reduce line selection tripping on the side of a transformer substation and permanent fault power loss of a whole line or part of a main line. The pure overhead line branch line is set according to the following fixed value, and the overhead cable hybrid branch line needs to consider the influence of capacitance and current of a cable line and increase the fixed value properly. Zero sequence protection can not guarantee to be capable of acting, and is only an attempt means of the current Kunming power grid.

1) for the branch line and other line circuits, no misoperation occurs when the other outgoing lines of the 10kV transformer substation are grounded under the condition that the branch line supplies other lines. At the moment, 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 does not exceed 20km can adopt a primary value of 2A. (must be the special zero sequence CT) the trunk line end platform uses 2.5s, the branch line first grade is 2s, cooperate with each other step by step, cooperate with the step difference to use 0.3 s.

1.2.3 reclosing

The first overhead line branch line or overhead cable mixed branch line is suitable for being switched into reclosing, and reclosing time is uniformly set for 2 seconds. The guard recovery time was set to 30 s.

The reclosing time of the second-stage circuit breaker of the branch line needs to be prolonged and is generally set to be 40s, the protection resetting time is set to be 60s, and the fault can still be isolated through the cooperation of the reclosing time of the upper stage and the lower stage when the rear-stage fault of the second circuit breaker jumps to the first circuit breaker in a secondary mode.

The branch line third-level and above circuit breakers can still be considered to be switched in, and the time is set according to the reclosing time of the second-level circuit breaker. Under the condition, the upper and lower stages can be improperly matched to trip, but the power supply reliability can still be improved by switching in the reclosure in consideration of more transient faults.

The reclosing of the branch line boundary circuit breaker of the customer is generally set according to the exit, the conditions of part of branch lines of the customer, more power supply equipment and the like are considered, the reclosing of the branch line boundary circuit breaker is really set according to the following principle by considering the improvement of the power supply reliability: the direct connection of the user branch line to the trunk line can be set according to 2 seconds, and the indirect connection to the trunk line can be set according to 60 seconds.

Cable run branch reclosing must withdraw from, reclosing withdraws in other cases.

2. Current step type line setting principle

2.110 kV outgoing line current step difference type circuit setting principle

(1) Quick-break protection

The quick-break protection mainly and comprehensively considers that the circuit breaker installed at the position has a certain protection range, the circuit breaker is ensured not to step over to a transformer substation under the condition of line fault, and the setting value of the quick-break protection is related to the bus impedance of the transformer substation. The first branch circuit breaker of the first main line and the first branch circuit breaker in front of the first main line are set according to the following principle.

1) And in cooperation with the quick-break protection fixed value of the line protection at the side of the transformer substation, the branch circuit breaker of the outgoing line of the 110kV transformer substation does not exceed 2400A under the general condition, and the branch circuit breaker of the outgoing line of the 35kV transformer substation cannot exceed the fixed value IdZ1/1.1 of the transformer substation. This principle must be satisfied for all branch breakers.

3) The fault setting of the low-voltage side of the maximum transformer which is supplied is considered to be avoided (the avoiding coefficient is at least 1.3), the condition that the low-voltage side is tripped without exceeding the grade when the fault occurs is ensured, namely, the fault of a customer is caused to go out, and the branch circuit breaker is prevented from playing the role of a lightning arrester.

4) Consider that the subordinate fuse can play a role in isolating faults. The lower stage fuse can typically blow at around 40ms in the event of a 1000A fault current, so the constant value can be set to 1200-1000A. If the time of the transformer station side is 0.3s, the time can be set according to 0.2s, 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 only be set according to 0 s. I.e. the step difference can be set in 0.1 s.

The other circuit breaker quick-break protection is set according to the upper and lower level matching and a certain protection range under the fault current of the fault point. Values are taken according to 2-4) and ensure the cooperation with the upper level.

(2) Overcurrent protection

1) the overcurrent protection constant value of the line protection at the side of the transformer substation is matched, a branch breaker leading out from a 110kV transformer substation is not more than 600A under the general condition, is not more than 700A under the special condition, and a branch breaker leading out from a 35kV transformer substation cannot exceed the transformer substation constant value IdZ 2/1.2. This principle must be satisfied for all branch breakers.

5) Generally, the over-current fixed value is not lower than 60A, and 120A is recommended to be achieved as much as possible. Overcurrent protection generally takes into account a certain margin to meet the demand for increased load in the following years. The time is matched and set with the circuit breaker with the recent overcurrent protection, and the time step difference can be set to be 0.1 s.

(3) Zero sequence overcurrent protection

When the 110kV station and the 35kV station are grounded by small resistors, the circuit breakers on the line posts of the 10kV outgoing lines are provided 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 transformer substation,

typical values are shown in the following table.

When 110kV and 35kV stations are low-current grounding line selection, zero-sequence overcurrent protection is considered to be put into operation so as to reduce the line selection tripping at the side of the transformer station and permanent fault total line power loss or partial main line power loss. The pure overhead line branch line is set according to the following fixed value, and the overhead cable hybrid branch line needs to consider the influence of capacitance and current of a cable line and increase the fixed value properly. Zero sequence protection can not guarantee to be capable of acting, and is only an attempt means of the current Kunming power grid.

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 does not exceed 20km can adopt a primary value of 2A. (must be special zero sequence CT)

The first level of the main line is 2.6s, the second level is 2.4s, the third level of the main line is 2.2s, the first level of the branch line is 2s, the branch lines are matched step by step, and the matching level difference is 0.2 s.

2.2 reclosing setting principle

The first main circuit breaker and the first branch empty cable mixed branch in front of the first main circuit breaker are suitable for being switched into reclosing, and the reclosing time is uniformly set to be 2 seconds. The guard recovery time was set to 30 s.

The reclosing time of the first branch circuit breaker and the first branch circuit breaker before the first non-main circuit breaker needs to be prolonged and is generally set to 40s, the protection resetting time is set to 60s, and the fault can still be isolated through the cooperation of the reclosing time of the upper stage and the lower stage when the rear-stage fault of the second circuit breaker jumps to the first circuit breaker.

And the reclosing of the third-stage and above circuit breakers can still be considered to be input, and the time is set according to the reclosing time of the second-stage circuit breaker. Under the condition, the upper and lower stages can be improperly matched to trip, but the power supply reliability can still be improved by switching in the reclosure in consideration of more transient faults.

10kV outgoing line setting principle of 2.310 kV switching station

The principle is the same as the current level difference type setting principle of a 10kV first main line breaker.

Table 1: beijing Kerui manufacturer type circuit breaker fixed value single template

Table 2: fixed value single template for oriental electronic manufacturer type circuit breaker

Table 3: 10kV large-capacity line 58.1+1 pole A01 circuit breaker protection constant value sheet

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a long-range system of revising of terminal definite value for 10kV circuit distribution switch, based on joining in marriage net OCS system foundation platform, a serial communication port, the system is including the application layer, calculation service layer, the data buffer layer that lay according to logical framework top-down, data buffer layer logical framework lower floor is laid, visual man-machine interface is laid to application layer logical framework upper strata, and dispose in joining in marriage net OCS system foundation platform's safe I district, obtain and save protection definite value, telesignalling telemetering measurement, electric wire netting model, electric wire netting figure, real-time state's data through joining in marriage net OCS system foundation platform, demonstrate definite value calculation, check result, supplementary analysis result, the long-range result of revising of definite value through visual man-machine interface, the system still includes:

the fixed value list is automatically generated, and a corresponding fixed value list template is selected according to the model of the protection device, the manufacturer and the position type of the circuit breaker by combining the fixed value calculated by the fixed value intelligent setting calculation module and the existing setting rule, so that the fixed value list is automatically generated;

2. A system for remote terminal rating modification for 10kV line distribution switches according to claim 1, wherein the rating list automatic generation module performs the following steps:

3. The system of claim 1, further comprising a voltage-time line setting principle and a current step-difference line setting principle.

4. The system of claim 1, wherein basic data is imported in the system equivalent impedance management through a data interface, an Excel, a PDF import mode and a manual page record mode.

5. The system of claim 1, wherein the system is configured to perform multi-stage coordination calculation by automatically analyzing the number of stages of the off-site circuit breaker during the intelligent setting calculation of the fixed value.

6. The system of claim 1, wherein the checking of the operating fixed values in the intelligent fixed value checking comprises switch cooperation checking at each stage and single switch checking.