CN111366878A - System and method for verifying differential protection polarity of startup and standby variable branch - Google Patents

System and method for verifying differential protection polarity of startup and standby variable branch Download PDF

Info

Publication number
CN111366878A
CN111366878A CN202010324959.6A CN202010324959A CN111366878A CN 111366878 A CN111366878 A CN 111366878A CN 202010324959 A CN202010324959 A CN 202010324959A CN 111366878 A CN111366878 A CN 111366878A
Authority
CN
China
Prior art keywords
transformer
standby
starting
current
voltage side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010324959.6A
Other languages
Chinese (zh)
Other versions
CN111366878B (en
Inventor
牛利涛
何信林
王团结
张钢
谭祥帅
吕健
陈炳宏
雷阳
杨世强
李春丽
张鹏
李强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Thermal Power Research Institute Co Ltd
Original Assignee
Thermal Power Research Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thermal Power Research Institute filed Critical Thermal Power Research Institute
Priority to CN202010324959.6A priority Critical patent/CN111366878B/en
Publication of CN111366878A publication Critical patent/CN111366878A/en
Application granted granted Critical
Publication of CN111366878B publication Critical patent/CN111366878B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

本发明公开了一种校验启备变分支差动保护极性的系统与方法。提出了利用发电机作为电流源,对启备变高压侧和低压侧分别进行短路试验,利用短路电流校验母线差动保护新接入启备变分支的极性和启备变差动保护极性,消除缺陷,确保差动保护运行正常。本方法解决了启备变负荷电流无法校验母线差动保护的难题,无需组织大量负荷,不用租用假负载,可操作性强。可以确保母线差动保护和启备变差动保护极性正确,防止差动保护误动作。

Figure 202010324959

The invention discloses a system and a method for verifying the polarity of the differential protection of the starting-standby variable branch. It is proposed to use the generator as a current source to conduct short-circuit tests on the high-voltage side and low-voltage side of the startup and standby transformers respectively, and use the short-circuit current to verify the polarity of the newly connected busbar differential protection branch and the differential protection poles of the startup and backup transformers. resistance, eliminate defects, and ensure that the differential protection operates properly. The method solves the problem that the starting and standby variable load current cannot verify the bus differential protection, does not need to organize a large number of loads, does not need to rent dummy loads, and has strong operability. It can ensure the correct polarity of the bus differential protection and the differential protection of the starting-standby variable, and prevent the differential protection from malfunctioning.

Figure 202010324959

Description

一种校验启备变分支差动保护极性的系统与方法A system and method for verifying the polarity of differential protection of starting and standby variable branches

技术领域technical field

本发明涉及电力试验技术领域,特别涉及一种校验启备变分支差动保护极性的系统与方法。The invention relates to the technical field of electric power testing, in particular to a system and method for verifying the polarity of a differential protection of a start-up-standby variable branch.

背景技术Background technique

差动保护是电力系统的主保护,差动保护运行的好坏关系到事故情况下故障能否正确切除。差动保护系统由于接线不认真、校核不准确,二次回路多点接地等造成保护误动的事件时有发生。因此在差动保护投入前应该进行极性校验,一方面是消除接线错误等缺陷;另一方面检查设备正常流过负荷电流时,差动保护是否会误动。差动保护极性校验一般通过带负荷试验完成。The differential protection is the main protection of the power system, and the operation of the differential protection is related to whether the fault can be removed correctly in the event of an accident. In the differential protection system, due to inaccurate wiring, inaccurate calibration, and multi-point grounding of the secondary circuit, protection misoperations occur from time to time. Therefore, the polarity check should be carried out before the differential protection is put into operation. On the one hand, it is to eliminate defects such as wiring errors; Differential protection polarity verification is generally completed through a load test.

发电厂扩建工程通常要设置启备变作为启动和备用电源,启备变通常连接在220kV或者500kV母线,因此母线差动保护接入启备变分支后和启备变差动保护投入前需要校验差动保护。对于启备变分支差动保护带负荷校验而言,存在如下两个难点:一是发电厂的负荷设备主要是风机、水泵,建设初期很难组织大的负荷,需要租用假负载作为负荷,成本较高;二是启备变容量有限,通常为30MVA或者50MVA,正常运行时高压侧负荷电流很小,低于母线差动保护的不平衡电流,纯负荷电流无法完成母线差动保护的校验。The power plant expansion project usually sets the starting and standby transformers as the starting and standby power sources. The starting and standby transformers are usually connected to 220kV or 500kV busbars. Therefore, after the bus differential protection is connected to the starting and standby transformer branches and before the starting and standby transformer differential protection is put into operation, it needs to be calibrated. Check differential protection. There are two difficulties for the load verification of the differential protection of the start-to-standby transformer branch: First, the load equipment of the power plant is mainly fans and water pumps. It is difficult to organize a large load in the early stage of construction. The cost is relatively high; second, the capacity of the startup and standby transformer is limited, usually 30MVA or 50MVA. During normal operation, the load current on the high-voltage side is very small, which is lower than the unbalanced current of the bus differential protection, and the pure load current cannot complete the calibration of the bus differential protection. test.

因此需要寻找一种操作方便、准确可靠的启备变分支差动保护极性校验的系统与方法。Therefore, it is necessary to find a convenient, accurate and reliable system and method for the polarity verification of the differential protection of the starting and standby variable branches.

发明内容SUMMARY OF THE INVENTION

为了克服上述现有技术的不足,本发明的目的在于提供一种校验启备变分支差动保护极性的系统与方法,该方法利用发电机作为电流源,对启备变高压侧和低压侧分别进行短路试验,利用短路电流校验母线差动保护新接入启备变分支的极性和启备变差动保护极性,消除缺陷,确保母线差动保护和启备变差动保护运行正常。该方法无需组织大量负荷,不用租用假负载,方法可靠,可操作性强。In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a system and method for verifying the polarity of the differential protection of the starting and standby transformer branches. Conduct short-circuit tests on both sides respectively, and use short-circuit current to verify the polarity of the newly connected start-standby transformer branch and the polarity of the start-standby differential protection of the bus differential protection to eliminate defects and ensure the bus differential protection and the start-standby differential protection. Operating normally. The method does not need to organize a large number of loads, and does not need to rent dummy loads. The method is reliable and has strong operability.

为了实现上述目的,本发明采用的技术方案是:In order to achieve the above object, the technical scheme adopted in the present invention is:

一种校验启备变分支差动保护极性的系统,包括高压母线3,高压母线3与发电机变压器单元2和启备变单元4相连,发电机变压器单元2上连接发电机励磁单元1,启备变单元4上连接启备变一分支单元5和启备变二分支单元6,启备变单元4、启备变一分支单元5和启备变二分支单元6连接启备变差动保护8。A system for verifying the polarity of differential protection of starting and standby transformer branches, comprising a high-voltage bus 3, the high-voltage bus 3 is connected to a generator transformer unit 2 and a starting and standby transformer unit 4, and the generator transformer unit 2 is connected to a generator excitation unit 1 , the startup-standby-transformation unit 4 is connected to the startup-standby-transformation branch unit 5 and the startup-standby-transformation two branch unit 6; Motion protection 8.

所述的发电机励磁单元1包括励磁变压器9,励磁变压器9通过励磁调节器10和灭磁开关11相连。The generator excitation unit 1 includes an excitation transformer 9 , and the excitation transformer 9 is connected with an excitation switch 11 through an excitation regulator 10 .

所述的发电机变压器单元2包括发电机12,发电机12通过发电机出口封闭母线13连接主变压器14,主变压器14通过主变高压侧电流互感器15和主变高压侧断路器16相连,主变高压侧断路器16接高压母线3。The generator-transformer unit 2 includes a generator 12, the generator 12 is connected to the main transformer 14 through the generator outlet closed bus 13, and the main transformer 14 is connected to the main transformer high voltage side circuit breaker 16 through the main transformer high voltage side current transformer 15, The main transformer high voltage side circuit breaker 16 is connected to the high voltage busbar 3 .

所述的启备变单元4包括接高压母线3的启备变高压侧断路器17,启备变高压侧断路器17依次连接启备变高压侧电流互感器一18、启备变高压侧电流互感器二19和启备变高压侧接地刀闸27;The start-up transformer unit 4 includes a start-up transformer high-voltage side circuit breaker 17 connected to the high-voltage bus 3, and the start-up transformer high-voltage side circuit breaker 17 is sequentially connected to the start-up transformer high-voltage side current transformer 1 18, and the activation and backup transformer high-voltage side current. The transformer 2 19 and the grounding switch 27 on the high voltage side of the start-up transformer;

启备变一分支单元5包括启备变一分支短路装置22,启备变一分支短路装置22一次连接启备变一分支电流互感器21、启备变一分支母线23;启备变二分支单元6包括启备变二分支短路装置25,启备变二分支短路装置25依次连接启备变二分支电流互感器24和启备变二分支母线26。The start-up change-one branch unit 5 includes a start-up change-one branch short-circuit device 22, and the start-up change-one branch short-circuit device 22 is connected to the start-up change-one branch current transformer 21 and the start-up change-one branch busbar 23 at one time; The unit 6 includes a two-branch short-circuit device 25 of the start-up transformer and two-branch short-circuit device 25, which is connected to the current transformer 24 and the bus-bar 26 of the start-up transformer and the transformer in sequence.

所述的主变高压侧电流互感器15的二次电流和启备变高压侧电流互感器一18的二次电流送至母线差动保护7构成母线差动保护;The secondary current of the current transformer 15 on the high voltage side of the main transformer and the secondary current of the current transformer 1 18 on the high voltage side of the start-up transformer are sent to the busbar differential protection 7 to form the busbar differential protection;

所述的启备变高压侧电流互感器二19的二次电流、启备变一分支电流互感器21二次电流和启备变二分支电流互感器24二次电流送至启备变差动保护8构成启备变差动保护。The secondary current of the current transformer 2 19 on the high-voltage side of the startup and backup, the secondary current of the current transformer 21 of the first branch of the startup and backup and the secondary current of the current transformer 24 of the second branch of the startup and backup are sent to the differential transformer of the startup and backup. The protection 8 constitutes the differential protection of the start-up variable.

一种校验启备变分支差动保护极性的校验方法,包括以下步骤;A verification method for verifying the polarity of the differential protection of the starting and standby variable branches, comprising the following steps;

1)进行母线差动保护7启备变分支极性校验的准备工作;1) Carry out the preparatory work for the polarity check of the busbar differential protection 7-start standby variable branch;

2)调节发电机12输出,保证启备变高压侧电流互感器一18的启备变高压侧二次电流为1A;2) Adjust the output of the generator 12 to ensure that the secondary current on the high-voltage side of the high-voltage side of the start-up transformer is 1A;

3)测量并记录主变压器高压侧电流互感器15的主变高压侧电流和启备变高压侧电流互感器一18的启备变高压侧电流;3) Measure and record the current on the high-voltage side of the main transformer of the high-voltage side current transformer 15 of the main transformer and the current on the high-voltage side of the transformer on the high-voltage side of the backup transformer 18;

4)检查母线差动保护7差流是否为零,如果母线差动保护7差流为零时,则转至步骤6),当母线差动保护7差流不为零时,则转至步骤5);4) Check whether the differential current of bus differential protection 7 is zero, if the differential current of bus differential protection 7 is zero, go to step 6), when the differential current of bus differential protection 7 is not zero, go to step 5);

5)降启备变高压侧电流为零,检查并消除CT缺陷;5) Drop the current of the high voltage side of the standby transformer to zero, check and eliminate CT defects;

6)进行启备变差动保护8校验准备;6) Prepare for the start-up variable differential protection 8 verification;

7)调节发电机12输出,保证启备变高压侧电流互感器二19的启备变高压侧二次电流为额定电流;7) Adjust the output of the generator 12 to ensure that the secondary current on the high-voltage side of the high-voltage side of the start-up changer is rated current;

8)测量并记录启备变高压侧电流互感器二19的启备变高压侧电流、启备变一分支电流互感器21的启备变一分支电流、启备变二分支电流互感器24的启备变二分支电流;8) Measure and record the high-voltage side current of the high-voltage side current transformer 219 of the high-voltage side, the current of the high-voltage side current transformer 21 of the high-voltage side current transformer 21 and the current of the two-branch current transformer 24 of the two-branch current transformer 24. Start-up transformer two-branch current;

9)检查启备变差动保护8差流是否为零,如果启备变差动保护8差流为零时,则转至步骤11),当启备变差动保护8差流不为零时,则转至步骤10);9) Check whether the differential current of the differential protection 8 is zero, if the differential current of the differential protection 8 is zero, then go to step 11), when the differential current of the differential protection 8 is not zero , then go to step 10);

11)启备变分支差动保护极性校验试验结束。11) The polarity verification test of the differential protection of the start-up transformer branch is completed.

所述的步骤1)的具体操作过程为:The concrete operation process of described step 1) is:

101)检查确认主变高压侧电流互感器15二次回路、启备变高压侧电流互感器一18二次回路接线准确,电流互感器变比选择和定值单一致,二次回路无开路现象;101) Check and confirm that the secondary circuit of the current transformer 15 on the high-voltage side of the main transformer and the secondary circuit of the current transformer-18 on the high-voltage side of the starting and standby transformers are correctly wired, the selection ratio of the current transformer is consistent with the fixed value list, and the secondary circuit has no open circuit phenomenon ;

102)检查确认主变高压侧断路器16、启备变高压侧断路器17处于合闸状态,且控制电源已经退出;102) Check to confirm that the main transformer high-voltage side circuit breaker 16 and the start-up transformer high-voltage side circuit breaker 17 are in the closed state, and the control power supply has been withdrawn;

103)检查确认作为短路装置的启备变高压侧接地刀闸27处于合闸状态,接地刀闸接触良好,A、B、C三相通过接地网构成短路装置;103) Check and confirm that the grounding switch 27 on the high-voltage side of the start-up transformer as a short-circuit device is in the closed state, the grounding switch is in good contact, and the three-phase A, B, and C phases form a short-circuit device through the grounding grid;

104)检查确认励磁变压器已带电,闭合灭磁开关11,调整励磁调节器10工作模式为手动状态,启备变分支具备通流条件。104) Check to confirm that the excitation transformer is charged, close the de-excitation switch 11, adjust the working mode of the excitation regulator 10 to the manual state, and the start-standby sub-branch meets the current-passing condition.

所述的步骤4)包括以下步骤:Described step 4) comprises the following steps:

401)检查主变压器高压侧电流互感器15的主变高压侧电流、启备变高压侧电流互感器一18的启备变高压侧电流和计算值是否一致;401) Check whether the current on the high-voltage side of the main transformer of the high-voltage side current transformer 15 of the main transformer and the current on the high-voltage side of the transformer on the high-voltage side of the backup transformer 18 are consistent with the calculated value;

402)在母线差动保护7读取主变压器高压侧电流互感器15的主变高压侧电流和启备变高压侧电流互感器一18的启备变高压侧电流,并检查是否和测量值一致;402) Read the high-voltage side current of the main transformer of the current transformer 15 on the high-voltage side of the main transformer and the current transformer of the high-voltage side of the backup transformer 18 in the bus differential protection 7, and check whether it is consistent with the measured value. ;

403)检查母线差动保护7差流是否为零,如果为零,则认为新接入的母线差动保护7的启备变高压侧电流互感器一18的启备变分支电流极性正确;如果不为零,则认为启备变单元4接入的二次电流极性不正确。403) Check whether the differential current of bus differential protection 7 is zero, and if it is zero, then it is considered that the current polarity of the starting and standby transformer branch current transformer-18 of the newly connected bus differential protection 7 is correct; If it is not zero, it is considered that the polarity of the secondary current connected to the start-up-standby-transformer unit 4 is incorrect.

所述的步骤5)包括以下步骤:Described step 5) comprises the following steps:

501)降启备变高压侧电流互感器一18的启备变高压侧电流为零,分发电机灭磁开关11,退出灭磁开关11控制电源,断开励磁变压器9电源;501) Drop the current transformer on the high-voltage side of the high-voltage side current transformer-18 to zero, divide the generator de-excitation switch 11, exit the de-excitation switch 11 to control the power supply, and disconnect the excitation transformer 9 power supply;

502)检查母线差动保护7启备变单元4接入的启备变高压侧电流互感器一18的启备变高压侧电流是够存在分流现象,选择的电流互感器变比与设计值是否一致,检查接入的电流极性是否正确,确认后,消除缺陷。502) Check whether the current transformer on the high-voltage side of the high-voltage side of the high-voltage side of the high-voltage side of the high-voltage side of the high-voltage side of the standby-to-standby transformer-18 connected to the differential protection 7 of the busbar differential protection 7 is sufficient to have a shunt phenomenon, and whether the transformation ratio of the selected current transformer and the design value are If it is consistent, check whether the polarity of the connected current is correct. After confirmation, eliminate the defect.

所述的步骤6)包括以下步骤:Described step 6) comprises the following steps:

601)降启备变高压侧电流互感器一18的启备变高压侧电流为零,分发电机灭磁开关11,退出灭磁开关11控制电源,断开励磁变压器9电源;601) Drop the current transformer on the high-voltage side of the high-voltage side of the start-up and standby-change to zero, divide the generator de-excitation switch 11, exit the control power supply of the de-excitation switch 11, and disconnect the power supply of the excitation transformer 9;

602)分开启备变高压侧接地刀闸27,并退出其控制、动力电源;602) Separately open the grounding switch 27 on the high voltage side of the standby transformer, and exit its control and power supply;

603)检查启备变一分支电流互感器21的启备变一分支电流回路、启备变二分支电流互感器24的启备变二分支电流回路接线准确,电流互感器变比选择和定值单一致,二次回路无开路现象;603) Check that the current loop of the current transformer 21, the current loop of the current transformer 21, the current loop of the current transformer 24, and the current loop of the current transformer 24 are accurate, and the current transformer transformation ratio selection and setting value Single consistent, no open circuit phenomenon in the secondary circuit;

604)检查确认启备变一分支短路装置22已经安装完成,接触良好,启备变一分支A、B、C三相通过短路装置短接;检查确认启备变二分支短路装置25已经安装完成,接触良好,启备变二分支A、B、C三相通过短路装置短接;604) Check and confirm that the short-circuit device 22 of the first branch of the start-up changer has been installed, and the contact is good, and the three-phase A, B, and C of the start-up changer branch are short-circuited through the short-circuit device; Check to confirm that the installation of the start-up changer two-branch short-circuit device 25 has been completed. , the contact is good, and the two branches A, B, and C of the start-up transformer are short-circuited through the short-circuit device;

605)励磁变压器9送电,闭合灭磁开关11,调整励磁调节器10工作模式为手动状态,启备变低压侧分支具备通流条件。605) The excitation transformer 9 is powered on, the de-excitation switch 11 is closed, the working mode of the excitation regulator 10 is adjusted to the manual state, and the low-voltage side branch of the startup and standby transformers has the current condition.

所述的步骤9)包括以下步骤:Described step 9) comprises the following steps:

901)检查启备变高压侧电流互感器二19的主变高压侧电流、启备变一分支电流互感器21的启备变一分支电流、启备变二分支电流互感器24的二分支电流和计算值是否一致;901) Check the high-voltage side current of the main transformer of the high-voltage side current transformer 219, the current of the first-branch current of the current transformer 21 of the backup transformer 21, and the current of the second branch of the current transformer 24 of the backup transformer 24 Whether it is consistent with the calculated value;

902)在启备变差动保护读取启备变高压侧电流互感器二19的启备变高压侧电流、启备变一分支电流互感器21启备变一分支电流和启备变二分支电流互感器24启备变二分支电流,并检查是否和测量值一致;902) In the differential protection of the start-up change, read the start-up change high-voltage side current of the high-voltage side current transformer 2 19 of the start-up change, the start-up change of a branch current transformer 21 and the start-up change of the first branch current and the start-up change of the second branch The current transformer 24 is turned on to change the two-branch current, and check whether it is consistent with the measured value;

903)检查启备变差动保护8差流是否为零,如果为零,则认为接入的启备变一分支电流互感器21的启备变一分支电流和启备变二分支电流互感器24的二分支电流极性正确;如果不为零,则认为启备变一分支单元5、启备变二分支单元6接入的二次电流极性不正确。903) Check whether the differential current of the start-up transformer differential protection 8 is zero, if it is zero, it is considered that the start-up transformer-first-branch current transformer 21 and the start-up transformer-two-branch current transformers connected to the transformer 21 The polarity of the two-branch current of 24 is correct; if it is not zero, it is considered that the polarity of the secondary current connected to the first branch unit 5 and the second branch unit 6 of the start-up transformer is incorrect.

所述的步骤10)包括以下步骤:Described step 10) comprises the following steps:

1001)降启备变高压侧电流互感器二19的启备变高压侧电流为零,分发电机灭磁开关11,退出灭磁开关11控制电源,断开励磁变压器9电源;1001) drop the current transformer on the high-voltage side of the high-voltage side current transformer two 19 to zero, divide the generator de-excitation switch 11, exit the control power supply of the de-excitation switch 11, and disconnect the excitation transformer 9 power supply;

1002)检查启备变差动保护8、启备变一分支单元5、启备变二分支单元6接入的启备变低压侧电流是够存在分流现象,选择的电流互感器变比与设计值是否一致,检查接入的电流极性是否正确,确认后,消除缺陷。1002) Check the differential protection of the start-up transformer 8, the first-branch unit 5 of the start-up transformer, and the low-voltage side current of the start-up transformer connected to the second-branch unit 6 of the start-up transformer is enough to have a shunting phenomenon, and the selected current transformer transformation ratio and design If the value is consistent, check whether the polarity of the connected current is correct. After confirmation, eliminate the defect.

本发明的有益效果:Beneficial effects of the present invention:

本发明所述一种校验启备变分支差动保护极性的系统与方法在具体操作时,采用发电机作为电流源,利用短路电流校验母线差动保护新接入启备变分支的极性和启备变差动保护极性,消除缺陷,确保差动保护运行正常。短路电流的大小不受启备变负荷电流大小的限制,该方法解决了启备变负荷电流无法校验母线差动保护的难题,无需组织大量负荷,不用租用假负载,经济性好,可操作性强。本方法适用于不同主接线方式的高压母线,适用于不同接线方式的启备变,便于在现场推广使用,确保母线差动保护和启备变差动保护准确可靠,防止差动保护误动作。The system and method of the present invention for verifying the polarity of the differential protection of the starting-standby sub-branch, in the specific operation, adopts the generator as the current source, and uses the short-circuit current to verify the differential protection of the busbar newly connected to the active-standby sub-branch. Polarity and start-up variable differential protection polarity to eliminate defects and ensure normal operation of differential protection. The size of the short-circuit current is not limited by the magnitude of the load current of the start-up/standby variable load. This method solves the problem that the start-up/standby variable load current cannot verify the differential protection of the busbar. There is no need to organize a large number of loads, and there is no need to rent dummy loads. It is economical and operable. Strong sex. This method is suitable for high-voltage busbars with different main wiring methods, and is suitable for starting and standby transformers with different wiring modes, which is convenient for popularization and application on site, ensures accurate and reliable differential protection of busbars and starting-standby transformers, and prevents misoperation of differential protection.

附图说明Description of drawings

图1为本发明的电路图;1 is a circuit diagram of the present invention;

图2为本发明流程图。Figure 2 is a flow chart of the present invention.

其中,1为发电机励磁单元、2为发电机变压器单元、3为高压母线、4为启备变单元、5为启备变一分支单元、6启备变二分支单元、7为母线差动保护装置、8为启备变差动保护、9为励磁变压器、10为整流柜和励磁调节器、11为灭磁开关、12为发电机、13为发电机封闭母线、14为主变压器、15为主变压器高压侧电流互感器、16为主变压器高压侧断路器、17为启备变高压侧断路器、18、启备变高压侧电流互感器一、19、启备变高压侧电流互感器二、20为启备变、21为启备变一分支电流互感器、22为启备变一分支短路装置、23为启备变一分支母线、24为启备变二分支电流互感器、25为启备变二分支短路装置、26为启备变二分支母线、27为启备变高压侧接地刀闸。Among them, 1 is the generator excitation unit, 2 is the generator transformer unit, 3 is the high-voltage bus, 4 is the starting and standby transformer unit, 5 is the starting and standby transformer branch unit, 6 is the starting and standby transformer two-branch unit, and 7 is the bus differential Protection device, 8 is the start-up variable differential protection, 9 is the excitation transformer, 10 is the rectifier cabinet and excitation regulator, 11 is the de-excitation switch, 12 is the generator, 13 is the generator closed bus, 14 is the main transformer, 15 Main transformer high-voltage side current transformer, 16 main transformer high-voltage side circuit breaker, 17 is the high-voltage side circuit breaker of the starting and standby transformers, 18, the starting and standby transformer high-voltage side current transformers 1, 19, the starting and standby transformer high-voltage side current transformers 2. 20 is the start-up transformer, 21 is the current transformer of the start-up change, 22 is the start-up change-a branch short circuit device, 23 is the start-up change-a branch bus, 24 is the start-up change two-branch current transformer, 25 It is the short-circuit device of the two branches of the starting and standby transformers, 26 is the busbar of the starting and standby transformers, and 27 is the grounding switch on the high-voltage side of the starting and standby transformers.

具体实施方式Detailed ways

下面结合附图对本发明作进一步详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings.

参考图1,本发明一种校验启备变分支差动保护极性的系统包括发电机励磁单元1、发电机变压器单元2、高压母线3、启备变单元4、启备变一分支单元5、启备变二分支单元6、母线差动保护装置7、启备变差动保护8。其中发电机变压器单元2和启备变单元4连接高压母线3;发电机励磁单元1给发电机提供励磁电流;启备变一分支单元5和启备变二分支单元6T结于启备变低压侧。Referring to FIG. 1, a system of the present invention for verifying the polarity of the differential protection of the starting and standby transformer branches includes a generator excitation unit 1, a generator transformer unit 2, a high-voltage bus 3, a starting and standby transformer unit 4, and a starting and standby transformer branch unit. 5. The second branch unit 6 of the startup and standby transformer, the busbar differential protection device 7, and the differential protection 8 of the startup and backup transformer. The generator transformer unit 2 and the start-up transformer unit 4 are connected to the high-voltage bus 3; the generator excitation unit 1 provides excitation current to the generator; side.

所述发电机励磁单元1包括:励磁变压器9、整流装置及励磁调节器10和灭磁开关11;发电机变压器单元2包括:发电机12、发电机出口封闭母线13、主变压器14、主变高压侧电流互感器15和主变高压侧断路器16;启备变单元4包括:启备变高压侧断路器17、启备变高压侧电流互感器一18、启备变高压侧电流互感器二19、启备变高压侧接地刀闸27;启备变一分支单元5包括:启备变一分支短路装置22、启备变一分支电流互感器21、启备变一分支母线23;启备变二分支单元6包括:启备变二分支短路装置25、启备变二分支电流互感器24、启备变二分支母线26。The generator excitation unit 1 includes: an excitation transformer 9, a rectifier device, an excitation regulator 10 and a de-excitation switch 11; the generator transformer unit 2 includes: a generator 12, a generator outlet closed bus 13, a main transformer 14, a main transformer The high-voltage side current transformer 15 and the main transformer high-voltage side circuit breaker 16; the activation and standby transformer unit 4 includes: activation and backup transformer high-voltage side circuit breaker 17, activation and backup transformer high-voltage side current transformer 1 18, activation and backup transformer high-voltage side current transformer 219. The grounding switch 27 on the high voltage side of the start-up transformer; the start-up transformer-a branch unit 5 includes: a start-up transformer-a branch short-circuit device 22, a start-up transformer-a branch current transformer 21, and a start-up transformer-a branch bus 23; The two-branch unit 6 of the standby-transformer includes: a short-circuit device 25 for the two-branch of the standby-transformation, a current transformer 24 for the two-branch of the standby-transformation, and a bus 26 for the two-branch of the standby-transformation.

主变高压侧电流互感器15的二次电流和启备变高压侧电流互感器一18的二次电流送至母线差动保护装置7构成母线差动保护;启备变高压侧电流互感器二19的二次电流、启备变一分支电流互感器21二次电流和启备变二分支电流互感器24二次电流送至启备变差动保护8构成启备变差动保护。The secondary current of the current transformer 15 on the high-voltage side of the main transformer and the secondary current of the current transformer 18 on the high-voltage side of the standby transformer are sent to the busbar differential protection device 7 to form the differential protection of the busbar; The secondary current of 19, the secondary current of the first-branch current transformer 21 and the secondary current of the second-branch current transformer 24 of the starting-standby are sent to the differential protection 8 of the starting-standby to constitute the starting-standby differential protection.

参考图2,Referring to Figure 2,

一种校验启备变分支差动保护极性的校验方法,包括以下步骤;A verification method for verifying the polarity of the differential protection of the starting and standby variable branches, comprising the following steps;

1)进行母线差动保护7启备变分支极性校验的准备工作;1) Carry out the preparatory work for the polarity check of the busbar differential protection 7-start standby variable branch;

2)调节发电机12输出,保证启备变高压侧电流互感器一18的启备变高压侧二次电流为1A;2) Adjust the output of the generator 12 to ensure that the secondary current on the high-voltage side of the high-voltage side of the start-up transformer is 1A;

3)测量并记录主变压器高压侧电流互感器15的主变高压侧电流和启备变高压侧电流互感器一18的启备变高压侧电流;3) Measure and record the current on the high-voltage side of the main transformer of the high-voltage side current transformer 15 of the main transformer and the current on the high-voltage side of the transformer on the high-voltage side of the backup transformer 18;

4)检查母线差动保护7差流是否为零,如果母线差动保护7差流为零时,则转至步骤6),当母线差动保护7差流不为零时,则转至步骤5);4) Check whether the differential current of bus differential protection 7 is zero, if the differential current of bus differential protection 7 is zero, go to step 6), when the differential current of bus differential protection 7 is not zero, go to step 5);

5)降启备变高压侧电流为零,检查并消除CT缺陷;5) Drop the current of the high voltage side of the standby transformer to zero, check and eliminate CT defects;

6)进行启备变差动保护8校验准备;6) Prepare for the start-up variable differential protection 8 verification;

7)调节发电机12输出,保证启备变高压侧电流互感器二19的启备变高压侧二次电流为额定电流;7) Adjust the output of the generator 12 to ensure that the secondary current on the high-voltage side of the high-voltage side of the start-up changer is rated current;

8)测量并记录启备变高压侧电流互感器二19的启备变高压侧电流、启备变一分支电流互感器21的启备变一分支电流、启备变二分支电流互感器24的启备变二分支电流;8) Measure and record the high-voltage side current of the high-voltage side current transformer 219 of the high-voltage side, the current of the high-voltage side current transformer 21 of the high-voltage side current transformer 21 and the current of the two-branch current transformer 24 of the two-branch current transformer 24. Start-up transformer two-branch current;

9)检查启备变差动保护8差流是否为零,如果启备变差动保护8差流为零时,则转至步骤11),当启备变差动保护8差流不为零时,则转至步骤10);9) Check whether the differential current of the differential protection 8 is zero, if the differential current of the differential protection 8 is zero, then go to step 11), when the differential current of the differential protection 8 is not zero , then go to step 10);

11)启备变分支差动保护极性校验试验结束。11) The polarity verification test of the differential protection of the start-up transformer branch is completed.

所述的步骤1)的具体操作过程为:The concrete operation process of described step 1) is:

101)检查确认主变高压侧电流互感器15二次回路、启备变高压侧电流互感器一18二次回路接线准确,电流互感器变比选择和定值单一致,二次回路无开路现象;101) Check and confirm that the secondary circuit of the current transformer 15 on the high-voltage side of the main transformer and the secondary circuit of the current transformer-18 on the high-voltage side of the starting and standby transformers are correctly wired, the selection ratio of the current transformer is consistent with the fixed value list, and the secondary circuit has no open circuit phenomenon ;

102)检查确认主变高压侧断路器16、启备变高压侧断路器17处于合闸状态,且控制电源已经退出;102) Check to confirm that the main transformer high-voltage side circuit breaker 16 and the start-up transformer high-voltage side circuit breaker 17 are in the closed state, and the control power supply has been withdrawn;

103)检查确认作为短路装置的启备变高压侧接地刀闸27处于合闸状态,接地刀闸接触良好,A、B、C三相通过接地网构成短路装置;103) Check and confirm that the grounding switch 27 on the high-voltage side of the start-up transformer as a short-circuit device is in the closed state, the grounding switch is in good contact, and the three-phase A, B, and C phases form a short-circuit device through the grounding grid;

104)检查确认励磁变压器已带电,闭合灭磁开关11,调整励磁调节器10工作模式为手动状态,启备变分支具备通流条件。104) Check to confirm that the excitation transformer is charged, close the de-excitation switch 11, adjust the working mode of the excitation regulator 10 to the manual state, and the start-standby sub-branch meets the current-passing condition.

所述的步骤4)包括以下步骤:Described step 4) comprises the following steps:

401)检查主变压器高压侧电流互感器15的主变高压侧电流、启备变高压侧电流互感器一18的启备变高压侧电流和计算值是否一致;401) Check whether the current on the high-voltage side of the main transformer of the high-voltage side current transformer 15 of the main transformer and the current on the high-voltage side of the transformer on the high-voltage side of the backup transformer 18 are consistent with the calculated value;

402)在母线差动保护7读取主变压器高压侧电流互感器15的主变高压侧电流和启备变高压侧电流互感器一18的启备变高压侧电流,并检查是否和测量值一致;402) Read the high-voltage side current of the main transformer of the current transformer 15 on the high-voltage side of the main transformer and the current transformer of the high-voltage side of the backup transformer 18 in the bus differential protection 7, and check whether it is consistent with the measured value. ;

403)检查母线差动保护7差流是否为零,如果为零,则认为新接入的母线差动保护7的启备变高压侧电流互感器一18的启备变分支电流极性正确;如果不为零,则认为启备变单元4接入的二次电流极性不正确。403) Check whether the differential current of bus differential protection 7 is zero, and if it is zero, then it is considered that the current polarity of the starting and standby transformer branch current transformer-18 of the newly connected bus differential protection 7 is correct; If it is not zero, it is considered that the polarity of the secondary current connected to the start-up-standby-transformer unit 4 is incorrect.

所述的步骤5)包括以下步骤:Described step 5) comprises the following steps:

501)降启备变高压侧电流互感器一18的启备变高压侧电流为零,分发电机灭磁开关11,退出灭磁开关11控制电源,断开励磁变压器9电源;501) Drop the current transformer on the high-voltage side of the high-voltage side current transformer-18 to zero, divide the generator de-excitation switch 11, exit the de-excitation switch 11 to control the power supply, and disconnect the excitation transformer 9 power supply;

502)检查母线差动保护7启备变单元4接入的启备变高压侧电流互感器一18的启备变高压侧电流是够存在分流现象,选择的电流互感器变比与设计值是否一致,检查接入的电流极性是否正确,确认后,消除缺陷。502) Check whether the current transformer on the high-voltage side of the high-voltage side of the high-voltage side of the high-voltage side of the high-voltage side of the high-voltage side of the standby-to-standby transformer-18 connected to the differential protection 7 of the busbar differential protection 7 is sufficient to have a shunt phenomenon, and whether the transformation ratio of the selected current transformer and the design value are If it is consistent, check whether the polarity of the connected current is correct. After confirmation, eliminate the defect.

所述的步骤6)包括以下步骤:Described step 6) comprises the following steps:

601)降启备变高压侧电流互感器一18的启备变高压侧电流为零,分发电机灭磁开关11,退出灭磁开关11控制电源,断开励磁变压器9电源;601) Drop the current transformer on the high-voltage side of the high-voltage side of the start-up and standby-change to zero, divide the generator de-excitation switch 11, exit the control power supply of the de-excitation switch 11, and disconnect the power supply of the excitation transformer 9;

602)分开启备变高压侧接地刀闸27,并退出其控制、动力电源;602) Separately open the grounding switch 27 on the high voltage side of the standby transformer, and exit its control and power supply;

603)检查启备变一分支电流互感器21的启备变一分支电流回路、启备变二分支电流互感器24的启备变二分支电流回路接线准确,电流互感器变比选择和定值单一致,二次回路无开路现象;603) Check that the current loop of the current transformer 21, the current loop of the current transformer 21, the current loop of the current transformer 24, and the current loop of the current transformer 24 are accurate, and the current transformer transformation ratio selection and setting value Single consistent, no open circuit phenomenon in the secondary circuit;

604)检查确认启备变一分支短路装置22已经安装完成,接触良好,启备变一分支A、B、C三相通过短路装置短接;检查确认启备变二分支短路装置25已经安装完成,接触良好,启备变二分支A、B、C三相通过短路装置短接;604) Check and confirm that the short-circuit device 22 of the first branch of the start-up changer has been installed, and the contact is good, and the three-phase A, B, and C of the start-up changer branch are short-circuited through the short-circuit device; Check to confirm that the installation of the start-up changer two-branch short-circuit device 25 has been completed. , the contact is good, and the two branches A, B, and C of the start-up transformer are short-circuited through the short-circuit device;

605)励磁变压器9送电,闭合灭磁开关11,调整励磁调节器10工作模式为手动状态,启备变低压侧分支具备通流条件。605) The excitation transformer 9 is powered on, the de-excitation switch 11 is closed, the working mode of the excitation regulator 10 is adjusted to the manual state, and the low-voltage side branch of the startup and standby transformers has the current condition.

所述的步骤9)包括以下步骤:Described step 9) comprises the following steps:

901)检查启备变高压侧电流互感器二19的主变高压侧电流、启备变一分支电流互感器21的启备变一分支电流、启备变二分支电流互感器24的二分支电流和计算值是否一致;901) Check the high-voltage side current of the main transformer of the high-voltage side current transformer 219, the current of the first-branch current of the current transformer 21 of the backup transformer 21, and the current of the second branch of the current transformer 24 of the backup transformer 24 Whether it is consistent with the calculated value;

902)在启备变差动保护读取启备变高压侧电流互感器二19的启备变高压侧电流、启备变一分支电流互感器21启备变一分支电流和启备变二分支电流互感器24启备变二分支电流,并检查是否和测量值一致;902) In the differential protection of the start-up change, read the start-up change high-voltage side current of the high-voltage side current transformer 2 19 of the start-up change, the start-up change of a branch current transformer 21 and the start-up change of the first branch current and the start-up change of the second branch The current transformer 24 is turned on to change the two-branch current, and check whether it is consistent with the measured value;

903)检查启备变差动保护8差流是否为零,如果为零,则认为接入的启备变一分支电流互感器21的启备变一分支电流和启备变二分支电流互感器24的二分支电流极性正确;如果不为零,则认为启备变一分支单元5、启备变二分支单元6接入的二次电流极性不正确。903) Check whether the differential current of the start-up transformer differential protection 8 is zero, if it is zero, it is considered that the start-up transformer-first-branch current transformer 21 and the start-up transformer-two-branch current transformers connected to the transformer 21 The polarity of the two-branch current of 24 is correct; if it is not zero, it is considered that the polarity of the secondary current connected to the first branch unit 5 and the second branch unit 6 of the start-up transformer is incorrect.

所述的步骤10)包括以下步骤:Described step 10) comprises the following steps:

1001)降启备变高压侧电流互感器二19的启备变高压侧电流为零,分发电机灭磁开关11,退出灭磁开关11控制电源,断开励磁变压器9电源;1001) drop the current transformer on the high-voltage side of the high-voltage side current transformer two 19 to zero, divide the generator de-excitation switch 11, exit the control power supply of the de-excitation switch 11, and disconnect the excitation transformer 9 power supply;

1002)检查启备变差动保护8、启备变一分支单元5、启备变二分支单元6接入的启备变低压侧电流是够存在分流现象,选择的电流互感器变比与设计值是否一致,检查接入的电流极性是否正确,确认后,消除缺陷。1002) Check the differential protection of the start-up transformer 8, the first-branch unit 5 of the start-up transformer, and the low-voltage side current of the start-up transformer connected to the second-branch unit 6 of the start-up transformer is enough to have a shunting phenomenon, and the selected current transformer transformation ratio and design If the value is consistent, check whether the polarity of the connected current is correct. After confirmation, eliminate the defect.

该方法利用发电机作为电流源,对启备变高压侧和低压侧分别进行短路试验,利用短路电流校验母线差动保护新接入启备变分支的极性和启备变差动保护极性,消除缺陷,确保差动保护运行正常。短路电流的大小不受启备变负荷电流大小的限制,该方法解决了启备变负荷电流无法校验母线差动保护的难题,无需组织大量负荷,不用租用假负载,经济性好,可操作性强。本方法适用于不同主接线方式的高压母线,适用于不同接线方式的启备变,便于在现场推广使用,确保母线差动保护和启备变差动保护准确可靠,防止差动保护误动作。This method uses the generator as a current source to conduct short-circuit tests on the high-voltage side and low-voltage side of the startup and standby transformers respectively, and uses the short-circuit current to verify the polarity of the newly connected busbar differential protection branch and the differential protection poles of the startup and backup transformers. resistance, eliminate defects, and ensure that the differential protection operates properly. The size of the short-circuit current is not limited by the magnitude of the load current of the start-up/standby variable load. This method solves the problem that the start-up/standby variable load current cannot verify the differential protection of the busbar. There is no need to organize a large number of loads, and there is no need to rent dummy loads. It is economical and operable. Strong sex. This method is suitable for high-voltage busbars with different main wiring methods, and is suitable for starting and standby transformers with different wiring modes, which is convenient for popularization and application on site, ensures accurate and reliable differential protection of busbars and starting-standby transformers, and prevents misoperation of differential protection.

以上所述,仅是本发明的较佳实施例,并非对本发明作任何限制,凡是根据本发明技术实质对以上实施例所作的任何简单修改、变更以及等效结构变化,均仍属于本发明技术方案的保护范围内。The above are only preferred embodiments of the present invention and do not limit the present invention. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technology of the present invention. within the scope of the program.

Claims (10)

1. The system for verifying the startup and standby variable branch differential protection polarity is characterized by comprising a high-voltage bus (3), wherein the high-voltage bus (3) is connected with a generator transformer unit (2) and a startup and standby variable unit (4), a generator excitation unit (1) is connected to the generator transformer unit (2), a startup and standby variable branch unit (5) and a startup and standby variable branch unit (6) are connected to the startup and standby variable unit (4), and the startup and standby variable unit (4), the startup and standby variable branch unit (5) and the startup and standby variable branch unit (6) are connected with a startup and standby variable differential protection unit (8).
2. A system for verifying the polarity of a backup variable differential protection according to claim 1, wherein the generator excitation unit (1) comprises an excitation transformer (9), the excitation transformer (9) is connected to the field switch (11) through an excitation regulator (10);
the generator transformer unit (2) comprises a generator (12), the generator (12) is connected with a main transformer (14) through a generator outlet closed bus (13), the main transformer (14) is connected with a main transformer high-voltage side circuit breaker (16) through a main transformer high-voltage side current transformer (15), and the main transformer high-voltage side circuit breaker (16) is connected with a high-voltage bus (3);
the starting and standby transformer unit (4) comprises a starting and standby transformer high-voltage side circuit breaker (17) connected with the high-voltage bus (3), and the starting and standby transformer high-voltage side circuit breaker (17) is sequentially connected with a starting and standby high-voltage side current transformer I (18), a starting and standby high-voltage side current transformer II (19) and a starting and standby high-voltage side grounding disconnecting link (27).
3. The system for verifying the differential protection polarity of the starting-standby transformer branch according to claim 1, wherein the starting-standby transformer branch unit (5) comprises a starting-standby transformer branch short-circuit device (22), and the starting-standby transformer branch short-circuit device (22) is connected with the starting-standby transformer branch current transformer (21) and the starting-standby transformer branch bus (23) at a time; the starting-standby transformer secondary branch unit (6) comprises a starting-standby transformer secondary branch short-circuit device (25), and the starting-standby transformer secondary branch short-circuit device (25) is sequentially connected with a starting-standby transformer secondary branch current transformer (24) and a starting-standby transformer secondary branch bus (26);
the secondary current of the main transformer high-voltage side current transformer (15) and the secondary current of the standby high-voltage side current transformer I18 are transmitted to the bus differential protection device (7) to form bus differential protection;
and the secondary current of the second starting-standby high-voltage side current transformer (19), the secondary current of the first starting-standby transformer branch current transformer (21) and the secondary current of the first starting-standby transformer branch current transformer (24) are transmitted to the differential protection (8) to form the differential protection.
4. A method for verifying a system for verifying the polarity of a backup variable differential protection according to claim 1, comprising the steps of;
1) carrying out preparation work of starting up the polarity check of the branch of the bus differential protection (7);
2) adjusting the output of the generator (12) to ensure that the secondary current of the starting and standby high-voltage side of the first starting and standby high-voltage side current transformer (18) is 1A;
3) measuring and recording main transformer high-voltage side current of a main transformer high-voltage side current transformer (15) and standby high-voltage side current of a standby high-voltage side current transformer I (18);
4) checking whether the differential flow of the bus differential protection (7) is zero, if the differential flow of the bus differential protection (7) is zero, turning to the step 6), and if the differential flow of the bus differential protection (7) is not zero, turning to the step 5);
5) reducing the standby high-voltage side current to zero, and checking and eliminating CT defects;
6) carrying out check preparation of the starting-up and standby variable differential protection (8);
7) the output of the generator (12) is regulated, and the secondary current of the starting-standby transformer high-voltage side current transformer II (19) is ensured to be rated current;
8) measuring and recording a starting-up transformer high-voltage side current of a starting-up transformer high-voltage side current transformer II (19), a starting-up transformer branch current of a starting-up transformer branch current transformer (21) and a starting-up transformer branch current of a starting-up transformer branch current transformer 24;
9) checking whether the differential flow of the starting-up variable differential protection (8) is zero, if the differential flow of the starting-up variable differential protection (8) is zero, turning to the step 11), and if the differential flow of the starting-up variable differential protection (8) is not zero, turning to the step 10);
11) and (5) starting the variable branch differential protection polarity verification test and ending the test.
5. The method for verifying the differential protection polarity of the startup variable branch according to claim 4, wherein the specific operation process of the step 1) is as follows:
101) checking and confirming that a secondary circuit of a main transformer high-voltage side current transformer (15) and a secondary circuit of a standby high-voltage side current transformer I (18) are accurately wired, the ratio selection of the current transformers is consistent with a fixed value, and the secondary circuit has no open circuit phenomenon;
102) checking and confirming that a main transformer high-voltage side circuit breaker (16) and a standby transformer high-voltage side circuit breaker (17) are in a closing state and a control power supply is withdrawn;
103) checking and confirming that a starting high-voltage side grounding knife switch 27 serving as a short-circuit device is in a closing state, the grounding knife switch is in good contact, and A, B, C three phases pass through a grounding grid to form the short-circuit device;
104) and checking to confirm that the excitation transformer is electrified, closing a de-excitation switch (11), adjusting the working mode of the excitation regulator (10) to be a manual state, and starting the variable branch to have a through-flow condition.
6. A verification method for verifying the polarity of the differential protection of the startup variable branch according to claim 4, wherein said step 4) comprises the steps of:
401) checking whether main transformer high-voltage side current of a main transformer high-voltage side current transformer (15) and standby high-voltage side current of a standby high-voltage side current transformer I18 are consistent with the calculated value;
402) reading main transformer high-voltage side current of a main transformer high-voltage side current transformer (15) and standby high-voltage side current of a standby high-voltage side current transformer I (18) in a bus differential protection (7), and checking whether the current is consistent with a measured value;
403) checking whether the differential current of the bus differential protection (7) is zero, and if the differential current is zero, determining that the polarity of the standby branch current of the standby high-voltage side current transformer I (18) of the newly-accessed bus differential protection (7) is correct; if the polarity of the secondary current switched in by the starting transformer unit (4) is not correct, the polarity of the secondary current is not zero.
7. A verification method for verifying the polarity of the differential protection of the startup variable branch according to claim 4, wherein said step 5) comprises the steps of:
501) the standby high-voltage side current of the standby high-voltage side current transformer I (18) is reduced to zero, the motor field-suppression switch (11) is distributed, the field-suppression switch (11) is withdrawn to control the power supply, and the power supply of the excitation transformer (9) is disconnected;
502) the method comprises the steps of checking whether the current on the starting and standby high-voltage side of a first starting and standby high-voltage side current transformer (18) accessed by a starting and standby transformer unit (4) of the bus differential protection (7) is enough to have a shunting phenomenon, checking whether the transformation ratio of the selected current transformer is consistent with a design value, checking whether the polarity of the accessed current is correct, and eliminating defects after confirmation.
8. A method for verifying the polarity of differential protection of a startup variable branch according to claim 4, wherein said step 6) comprises the steps of:
601) the standby high-voltage side current of the standby high-voltage side current transformer I (18) is reduced to zero, the motor field-suppression switch (11) is distributed, the field-suppression switch (11) is withdrawn to control the power supply, and the power supply of the excitation transformer (9) is disconnected;
602) separately opening a standby high-voltage side grounding disconnecting link (27) and quitting the control and power supply thereof;
603) checking that a starting-standby one-branch current loop of a starting-standby one-branch current transformer (21) and a starting-standby two-branch current loop of a starting-standby two-branch current transformer (24) are accurately connected, the ratio selection of the current transformers is consistent with the fixed value list, and a secondary loop has no open circuit phenomenon;
604) checking and confirming that the starting-standby branch A, B, C three-phase short circuit is completed by the short circuit device, the contact is good, and the starting-standby branch A, B, C three-phase short circuit is completed; checking and confirming that the starting-up and standby transformer two-branch short-circuit device 25 is installed and well contacted, and the three phases of the starting-up and standby transformer two-branch A, B, C are short-circuited through the short-circuit device;
605) the excitation transformer (9) is powered on, the de-excitation switch (11) is closed, the working mode of the excitation regulator (10) is adjusted to be in a manual state, and the low-voltage side branch of the start-up device has a through-flow condition.
9. A method for verifying the polarity of differential protection of a startup variable branch according to claim 4, wherein said step 9) comprises the steps of:
901) checking whether main transformer high-voltage side current of a starting-standby transformer high-voltage side current transformer II (19), starting-standby transformer branch current of a starting-standby transformer branch current transformer (21) and branch current of a starting-standby transformer branch current transformer (24) are consistent with a calculated value;
902) reading a starting-up transformer high-voltage side current of a starting-up transformer high-voltage side current transformer II (19), a starting-up transformer branch current transformer (21) and a starting-up transformer branch current of a starting-up transformer branch current transformer 24 in the starting-up transformer differential protection, and checking whether the starting-up transformer high-voltage side current and the starting-up transformer branch current are consistent with a measured value;
903) checking whether the differential current of the starting-standby transformer differential protection (8) is zero, and if the differential current is zero, considering that the polarity of the starting-standby transformer branch current of the connected starting-standby transformer branch current transformer (21) and the polarity of the two branch current of the starting-standby transformer branch current transformer (24) are correct; if the polarity is not zero, the polarity of the secondary current switched in by the starting-up branch unit (5) and the starting-up branch unit (6) is not correct.
10. A method for verifying the polarity of differential protection of a startup variable branch according to claim 4, wherein said step 10) comprises the steps of:
1001) reducing the current of the starting-standby transformer high-voltage side of a second current transformer (19) of the starting-standby transformer high-voltage side to zero, distributing a de-excitation switch (11) of the motor, withdrawing the control power supply of the de-excitation switch (11), and disconnecting the power supply of the excitation transformer 9;
1002) and checking whether the current on the low-voltage side of the start-up and standby transformer accessed by the start-up and standby transformer differential protection (8), the start-up and standby transformer one-branch unit (5) and the start-up and standby transformer two-branch unit (6) is enough to have a shunting phenomenon, checking whether the transformation ratio of the selected current transformer is consistent with a design value, checking whether the polarity of the accessed current is correct, and eliminating defects after confirmation.
CN202010324959.6A 2020-04-23 2020-04-23 A system and method for checking the polarity of branch differential protection of standby transformer Active CN111366878B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010324959.6A CN111366878B (en) 2020-04-23 2020-04-23 A system and method for checking the polarity of branch differential protection of standby transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010324959.6A CN111366878B (en) 2020-04-23 2020-04-23 A system and method for checking the polarity of branch differential protection of standby transformer

Publications (2)

Publication Number Publication Date
CN111366878A true CN111366878A (en) 2020-07-03
CN111366878B CN111366878B (en) 2025-01-21

Family

ID=71212177

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010324959.6A Active CN111366878B (en) 2020-04-23 2020-04-23 A system and method for checking the polarity of branch differential protection of standby transformer

Country Status (1)

Country Link
CN (1) CN111366878B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112858958A (en) * 2021-01-05 2021-05-28 中国神华能源股份有限公司国华电力分公司 Method for detecting current wiring polarity of high-backup-power-transformation protection device
CN112965005A (en) * 2021-02-04 2021-06-15 西安热工研究院有限公司 System and method for verifying differential protection polarity by using dummy load
CN113964784A (en) * 2021-10-28 2022-01-21 西安热工研究院有限公司 System and method for correcting polarity and configuration of differential protection for motor single-phase primary current flow
CN114113821A (en) * 2021-09-30 2022-03-01 华能太仓发电有限责任公司 Incoming line current transformer wiring identification method for bus differential protection device
CN114384445A (en) * 2021-12-21 2022-04-22 广州发展电力科技有限公司 Differential protection starting test method and device for 220KV starting-standby transformer
CN115291014A (en) * 2022-08-03 2022-11-04 国能南京电力试验研究有限公司 A new type of high-safety factory system with load test method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2368990C1 (en) * 2008-06-16 2009-09-27 Государственное образовательное учреждение высшего профессионального образования "Карачаево-Черкесская государственная технологическая академия" Electronic device for fast blocking of transformer differential protection
CN103809146A (en) * 2013-12-02 2014-05-21 国家电网公司 Test method of main transformer CT (Current Transformer)
RU2598903C1 (en) * 2012-09-11 2016-10-10 ЭнАр ЭЛЕКТРИК КО., ЛТД Method of differential protection when converting frequency for output transformer system with static frequency converter
CN205941772U (en) * 2016-08-21 2017-02-08 中国电建集团河南工程公司 Wind -powered electricity generation field and photovoltaic power plant circuit and generating line differential circuit polarity checkout system
CN106569075A (en) * 2015-10-10 2017-04-19 宝山钢铁股份有限公司 Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method
CN108181528A (en) * 2017-12-31 2018-06-19 中国能源建设集团华东电力试验研究院有限公司 The high-tension cable differential protection check system of no load condition
CN108494013A (en) * 2018-02-05 2018-09-04 国电南瑞科技股份有限公司 Machine relaying configuration method is opened based on protected object
CN212111751U (en) * 2020-04-23 2020-12-08 西安热工研究院有限公司 A system for verifying the polarity of the differential protection of the starting and standby variable branches

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2368990C1 (en) * 2008-06-16 2009-09-27 Государственное образовательное учреждение высшего профессионального образования "Карачаево-Черкесская государственная технологическая академия" Electronic device for fast blocking of transformer differential protection
RU2598903C1 (en) * 2012-09-11 2016-10-10 ЭнАр ЭЛЕКТРИК КО., ЛТД Method of differential protection when converting frequency for output transformer system with static frequency converter
CN103809146A (en) * 2013-12-02 2014-05-21 国家电网公司 Test method of main transformer CT (Current Transformer)
CN106569075A (en) * 2015-10-10 2017-04-19 宝山钢铁股份有限公司 Main transformer and high voltage side cable zero-sequence differential protection polarity test circuit and method
CN205941772U (en) * 2016-08-21 2017-02-08 中国电建集团河南工程公司 Wind -powered electricity generation field and photovoltaic power plant circuit and generating line differential circuit polarity checkout system
CN108181528A (en) * 2017-12-31 2018-06-19 中国能源建设集团华东电力试验研究院有限公司 The high-tension cable differential protection check system of no load condition
CN108494013A (en) * 2018-02-05 2018-09-04 国电南瑞科技股份有限公司 Machine relaying configuration method is opened based on protected object
CN212111751U (en) * 2020-04-23 2020-12-08 西安热工研究院有限公司 A system for verifying the polarity of the differential protection of the starting and standby variable branches

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
宫平 等: "基于电子式互感器的发电厂启备变差动保护配置方式研究", 《科学技术创新》, 13 November 2018 (2018-11-13) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112858958A (en) * 2021-01-05 2021-05-28 中国神华能源股份有限公司国华电力分公司 Method for detecting current wiring polarity of high-backup-power-transformation protection device
CN112858958B (en) * 2021-01-05 2023-02-28 中国神华能源股份有限公司国华电力分公司 Method for detecting current wiring polarity of high-backup-power-transformation protection device
CN112965005A (en) * 2021-02-04 2021-06-15 西安热工研究院有限公司 System and method for verifying differential protection polarity by using dummy load
CN114113821A (en) * 2021-09-30 2022-03-01 华能太仓发电有限责任公司 Incoming line current transformer wiring identification method for bus differential protection device
CN114113821B (en) * 2021-09-30 2024-02-27 华能太仓发电有限责任公司 Wiring identification method for incoming line current transformer of bus differential protection device
CN113964784A (en) * 2021-10-28 2022-01-21 西安热工研究院有限公司 System and method for correcting polarity and configuration of differential protection for motor single-phase primary current flow
CN114384445A (en) * 2021-12-21 2022-04-22 广州发展电力科技有限公司 Differential protection starting test method and device for 220KV starting-standby transformer
CN114384445B (en) * 2021-12-21 2025-04-18 广州发展电力科技有限公司 A 220KV start-up transformer differential protection start-up test method and device
CN115291014A (en) * 2022-08-03 2022-11-04 国能南京电力试验研究有限公司 A new type of high-safety factory system with load test method

Also Published As

Publication number Publication date
CN111366878B (en) 2025-01-21

Similar Documents

Publication Publication Date Title
CN111366878A (en) System and method for verifying differential protection polarity of startup and standby variable branch
CN102095950B (en) Overall test and construction method of differential protection system of large-scale transformer
CN105785157B (en) Double main transformer longitudinal differential protection cyclization test methods
CN110504712A (en) A gas-fired power plant π-type homologous nuclear phase system and method
CN110854925A (en) One-time voltage-on synchronous nuclear phase inspection system and inspection method for electrical system
CN111007439A (en) Transformer substation bus protection secondary circuit commissioning on-load test method
CN105388385A (en) Bus differential protection vector concentrated test method
CN108614213A (en) The polarity test method of transformer unit differential protection
CN105319466B (en) A kind of middle pressure electric equipment simulation live testing test method
CN111624488A (en) Generator-transformer unit differential protection polarity test system and method
CN112858958A (en) Method for detecting current wiring polarity of high-backup-power-transformation protection device
CN212111751U (en) A system for verifying the polarity of the differential protection of the starting and standby variable branches
CN109683106A (en) Different capabilities surge generator is grid-connected to provide the short-circuit test system of power supply
CN111521860B (en) A system and method for verifying bus differential protection polarity using transformer excitation inrush current
CN114397523A (en) Transformer differential protection stability test method
CN103592552A (en) Instrument and method for testing characteristics of overvoltage protection device
CN112965005B (en) System and method for verifying differential protection polarity by using dummy load
CN114594327A (en) Device and method for automatic detection of AC and DC performance of external power supply monitor
CN104198952A (en) Reliability validation method of 6.6KV mobile emergency power source of nuclear power station
CN115951138A (en) Automatic standby power supply switching device and uninterrupted power supply verification method of outlet loop of automatic standby power supply switching device
CN114362347A (en) A kind of transmission method of uninterrupted backup and automatic switching device
CN117554723B (en) Preventive current rising test method and test device for high-voltage transformer
CN111624523A (en) System and method for verifying differential protection polarity of line of generator-transformer unit wiring mode system
CN117031171B (en) A method for testing relay protection equipment polarity without actual load simulation
CN217385808U (en) A transformer primary current test device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant