CN112087048B - A system and method for configuring zero-sequence protection of variable branches for high-voltage plant - Google Patents

A system and method for configuring zero-sequence protection of variable branches for high-voltage plant Download PDF

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CN112087048B
CN112087048B CN202010929883.XA CN202010929883A CN112087048B CN 112087048 B CN112087048 B CN 112087048B CN 202010929883 A CN202010929883 A CN 202010929883A CN 112087048 B CN112087048 B CN 112087048B
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voltage
factory
transformer
zero
busbar
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CN112087048A (en
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周亚群
张钢
赵婷婷
都劲松
曹浩军
吴晋
吕尚霖
刘欢
付东岩
刘瞻
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Xian Thermal Power Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
    • H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars

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  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a high-voltage plant branch zero-sequence protection configuration system and a method, which comprises a high-voltage plant high-voltage side closed bus, a high-voltage plant transformer, a high-voltage plant low-voltage side closed bus, a high-voltage plant bus working incoming line switch lower port CT, a high-voltage plant bus, a high-voltage plant low-voltage side neutral point zero-sequence CT, a high-voltage plant low-voltage side neutral point grounding resistor and a high-voltage plant branch protection device.

Description

一种高压厂用变分支零序保护配置系统及方法A system and method for configuring zero-sequence protection of variable branches for high-voltage plant

技术领域technical field

本发明属于电气保护技术领域，涉及一种高压厂用变分支零序保护配置系统及方法。The invention belongs to the technical field of electrical protection, and relates to a zero-sequence protection configuration system and method for variable branches used in a high-voltage factory.

背景技术Background technique

发电机组正常运行时，可由高压厂用变为发电机组提供厂用电源，同时配置高压备用变作为机组备用电源，两电源之间通过快切装置实现电源切换。When the generator set is in normal operation, the high-voltage plant can be changed into the generator set to provide the plant power supply, and the high-voltage standby transformer is configured as the standby power supply of the generator set.

对于高压厂用变低压侧中性点经小电阻接地系统，高压厂用变分支零序保护采用零序电流原理，零序电流元件通常仅选用高压厂用变低压侧中性点零序电流，零序电流保护分为两时限。根据《DLT1502厂用继电保护整定计算导则》，对于中性点经小电阻接地系统，高压厂用变分支零序保护一时限动作于跳本分支断路器、闭锁备用电源切换，分支零序保护二时限动作于停机、启动备用电源切换，其中分支零序保护一时限按与下一级零序过流保护最长动作时间配合整定，分支零序保护二时限按与分支零序保护一时限时间配合整定。For the low-voltage side neutral point grounding system of high-voltage power plant transformer, the zero-sequence protection of high-voltage power plant transformer branch adopts the principle of zero-sequence current, and the zero-sequence current element usually only uses the zero-sequence current of the neutral point of the low-voltage side of the high-voltage power plant transformer. The zero sequence current protection is divided into two time limits. According to the "DLT1502 Factory Relay Protection Setting Calculation Guide", for the neutral point grounding system with small resistance, the high voltage factory transformer branch zero sequence protection acts for a time limit to trip the branch circuit breaker, block the backup power switch, and the branch zero sequence protection. The second time limit of the protection operates at shutdown and starting the standby power switch. The first time limit of the branch zero-sequence protection is set according to the longest action time of the next-level zero-sequence overcurrent protection, and the second time limit of the branch zero-sequence protection is set according to the first time limit of the branch zero-sequence protection. Time to match.

以上高压厂用变分支零序保护配置方式，当故障点位于分支断路器至高压厂用母线之间时，分支零序保护一时限动作，出口方式为跳本分支断路器、闭锁备用电源切换，故障切除；当故障点位于高压厂用变低压绕组至分支断路器之间时，分支零序保护一时限动作，出口方式为跳本分支断路器、闭锁备用电源切换，一时限动作后，由于分支零序故障依然存在，分支零序保护二时限动作，出口方式为停机、启动备用电源切换，但是由于二时限动作前，分支零序一时限一直处在动作状态，导致二时限动作前备用电源切换为闭锁状态，同时由于快切装置保护闭锁开入消失时，需要手动复归或者快切装置经过10s延时自动复归后，才能再次启动备用电源切换，所以当二时限动作时，启动备用电源切换失败，厂用电源失电。故障点位于高压厂用变低压绕组至分支断路器之间，分支零序保护一、二时限均正确动作，但是二时限动作时，由于快切装置保护闭锁快切未能及时复归，导致启动备用电源切换失败这类案例已在某发电厂发生过。因此，寻找一种高压厂用变分支零序保护配置系统及方法具有重要的意义。The above high-voltage factory variable branch zero-sequence protection configuration mode, when the fault point is between the branch circuit breaker and the high-voltage factory bus, the branch zero-sequence protection will act for a time limit, and the exit mode is to trip the branch circuit breaker and block the backup power switch. Fault removal; when the fault point is located between the high-voltage plant transformer low-voltage winding and the branch circuit breaker, the branch zero-sequence protection acts for a time limit, and the exit method is to trip the branch circuit breaker and block the backup power switch. The zero-sequence fault still exists, the branch zero-sequence protection operates in the second time limit, and the exit method is to stop and start the backup power switch. However, before the two-time limit action, the branch zero-sequence first time limit has been in the active state, resulting in the backup power switch before the second time limit action. It is in the locked state, and when the protective latching opening of the quick-cutting device disappears, it needs to be manually reset or the quick-cutting device will automatically reset after a delay of 10s before the backup power switch can be started again. Therefore, when the second time limit is activated, the start of the backup power switch fails. , the factory power supply is out of power. The fault point is located between the high-voltage utility transformer low-voltage winding and the branch circuit breaker. The first and second time limits of the branch zero-sequence protection operate correctly. However, when the second time limit acts, the fast-cutting device protection blocking and quick-cutting fail to reset in time, resulting in the start-up backup. A case of power switching failure has occurred in a power plant. Therefore, it is of great significance to find a system and method for the zero-sequence protection configuration of the variable branch in the high-voltage plant.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于克服上述现有技术的缺点，提供了一种高压厂用变分支零序保护配置系统及方法，该系统及方法能够判断故障点位置，以选择不同的保护出口方式。The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and to provide a system and method for configuring zero-sequence protection of variable branches for high-voltage plants, the system and method can determine the position of the fault point to select different protection outlet modes.

为达到上述目的，本发明所述的高压厂用变分支零序保护配置系统包括高压厂用变高压侧封闭母线、高压厂用变、高压厂用变低压侧封闭母线、高压厂用母线工作进线开关、高压厂用母线工作进线开关下口CT、高压厂用母线、高压厂用变低压侧中性点零序CT、高压厂用变低压侧中性点接地电阻及高压厂用变保护装置；In order to achieve the above purpose, the high-voltage plant transformer branch zero-sequence protection configuration system according to the present invention includes a high-voltage plant transformer high-voltage side closed bus, a high-voltage plant transformer, a high-voltage plant transformer low-voltage side closed bus, and a high-voltage plant bus working input. Line switch, high-voltage factory busbar working incoming line switch lower port CT, high-voltage factory busbar, high-voltage factory transformer low-voltage side neutral point zero-sequence CT, high-voltage factory transformer low-voltage side neutral point grounding resistance and high-voltage factory transformer protection device;

高压厂用变高压侧封闭母线经高压厂用变、高压厂用变低压侧封闭母线及高压厂用母线工作进线开关与高压厂用母线相连接，高压厂用母线工作进线开关下口CT安装于高压厂用母线工作进线开关与高压厂用母线之间的线路上，高压厂用变的低压侧中性点通过高压厂用变低压侧中性点接地电阻接地，高压厂用变低压侧中性点零序CT安装于高压厂用变的低压侧中性点与高压厂用变低压侧中性点接地电阻之间的线路上，高压厂用变保护装置与高压厂用母线工作进线开关下口CT的二次侧及高压厂用变低压侧中性点零序CT的二次侧相连接。The high-voltage side closed busbar of the high-voltage factory transformer is connected to the high-voltage factory busbar through the high-voltage factory transformer, the low-voltage side closed busbar of the high-voltage factory transformer, and the high-voltage factory busbar working incoming switch. It is installed on the line between the incoming switch of the high-voltage factory busbar and the high-voltage factory busbar. The zero-sequence CT of the side neutral point is installed on the line between the neutral point of the low-voltage side of the high-voltage utility transformer and the grounding resistance of the neutral point of the low-voltage side of the high-voltage utility transformer. The secondary side of the lower port CT of the line switch is connected with the secondary side of the neutral point zero-sequence CT of the low-voltage side of the high-voltage plant.

高压厂用变高压绕组的接线方式为△型接线方式，高压厂用变低压绕组的接线方式为Y型接线方式。The wiring mode of the transformer high-voltage winding used in the high-voltage factory is the △-type wiring mode, and the wiring mode of the transformer low-voltage winding used in the high-voltage factory is the Y-shaped wiring mode.

一种高压厂用变分支零序保护配置方法包括以下步骤：A zero-sequence protection configuration method for a high-voltage factory-use variable branch includes the following steps:

投入高压厂用变分支零序保护，当高压厂用变低压侧中性点零序CT的零序电流大于整定值，高压厂用母线工作进线开关下口CT的自产零序电流小于整定值时，则故障区域在高压厂用变的低压绕组至高压厂用母线工作进线开关之间，经保护一时限出口跳闸，出口方式为停机，同时启动备用电源切换；When the zero-sequence current of the zero-sequence CT of the neutral point zero-sequence CT on the low-voltage side of the high-voltage factory-use transformer is greater than the set value, the self-produced zero-sequence current of the lower port CT of the high-voltage factory busbar working incoming switch is less than the set value. When the value is set, the fault area is between the low-voltage winding of the high-voltage factory transformer and the working incoming switch of the high-voltage factory bus, the outlet is tripped for a time limit after protection, the outlet mode is shutdown, and the standby power switch is started at the same time;

投入高压厂用变分支零序保护，当高压厂用变低压侧中性点零序CT零序电流大于整定值，高压厂用母线工作进线开关下口CT自产零序电流大于整定值时，则故障区域在高压厂用母线工作进线开关至高压厂用母线之间，经保护一时限出口跳闸，出口方式为跳高压厂用母线工作进线开关，同时闭锁备用电源切换。Put into high-voltage factory transformer branch zero-sequence protection, when the zero-sequence current of the neutral point zero-sequence CT on the low-voltage side of the high-voltage factory transformer is greater than the set value, and the self-produced zero-sequence current of the CT at the lower port of the high-voltage factory busbar working incoming switch is greater than the set value , the fault area is between the working incoming switch of the high-voltage factory busbar and the high-voltage factory busbar, and the outlet will trip after a time limit of protection.

本发明具有以下有益效果：The present invention has the following beneficial effects:

本发明所述的高压厂用变分支零序保护配置系统及方法在具体操作时，在高压厂用母线工作进线开关下口安装高压厂用母线工作进线开关下口CT，并将高压厂用母线工作进线开关下口CT自产零序电流引入高压厂用变分支零序保护，作为分支零序保护电流判据之一。以高压厂用母线工作进线开关作为分界点，通过高压厂用母线工作进线开关下口CT自产零序电流，将高压厂用变分支零序保护范围分为两部分，其中，第一部分为高压厂用变低压绕组至高压厂用母线工作进线开关，第二部分为高压厂用母线工作进线开关至高压厂用母线，另外，当故障位于高压厂用变低压绕组至高压厂用母线工作进线开关时，则出口方式为停机，同时启动备用电源切换；当故障位于高压厂用母线工作进线开关至高压厂用母线时，则出口方式为跳高压厂用母线工作进线开关，同时闭锁备用电源切换，通过故障点位置区分，实现不同保护出口方式的选择。In the specific operation of the system and method for the zero-sequence protection configuration system and method for high-voltage factory-use variable branches of the present invention, the lower port of the high-voltage factory-use busbar working incoming line switch is installed at the lower port of the high-voltage factory-use busbar working incoming line switch, and the high-voltage power plant The self-produced zero-sequence current of the lower port of the incoming switch of the busbar is introduced into the zero-sequence protection of the high-voltage factory-use variable branch, as one of the current criteria for the zero-sequence protection of the branch. Taking the high-voltage factory busbar working incoming switch as the dividing point, the zero-sequence current is produced by the lower port CT of the high-voltage factory busbar working incoming switch, and the zero-sequence protection range of the high-voltage factory transformer branch is divided into two parts. The first part It is the incoming switch from the high-voltage factory transformer low-voltage winding to the high-voltage factory busbar. The second part is the high-voltage factory busbar working incoming switch to the high-voltage factory busbar. In addition, when the fault is located in the high-voltage factory. When the busbar working incoming switch is used, the exit mode is to stop, and the standby power switch is started at the same time; when the fault is located at the high-voltage factory busbar working incoming switch to the high-voltage factory busbar, the exit mode is to jump the high-voltage factory busbar working incoming switch , at the same time, the backup power switch is blocked, and the selection of different protection outlet methods can be realized by distinguishing the location of the fault point.

附图说明Description of drawings

图1为本发明的保护配置图；1 is a protection configuration diagram of the present invention;

图2为本发明的保护逻辑图；Fig. 2 is the protection logic diagram of the present invention;

图3为现有技术的保护配置图；3 is a protection configuration diagram of the prior art;

图4为现有技术的保护逻辑图。FIG. 4 is a protection logic diagram of the prior art.

其中，1为高压厂用变高压侧封闭母线、2为高压厂用变、3为高压厂用变低压侧封闭母线、4为高压厂用母线工作进线开关、5为高压厂用母线工作进线开关下口CT、6为高压厂用母线、7为高压厂用变低压侧中性点零序CT、8为高压厂用变低压侧中性点接地电阻、9为高压厂用变保护装置。Among them, 1 is the closed busbar on the high-voltage side of the high-voltage plant, 2 is the high-voltage plant transformer, 3 is the closed busbar on the low-voltage side of the high-voltage plant, 4 is the working incoming switch of the high-voltage plant bus, and 5 is the working input of the high-voltage plant bus. The lower port CT of the line switch, 6 is the high-voltage factory bus, 7 is the neutral point zero sequence CT of the low-voltage side of the high-voltage factory transformer, 8 is the neutral point grounding resistance of the low-voltage side of the high-voltage factory transformer, and 9 is the high-voltage factory transformer protection device .

具体实施方式Detailed ways

下面结合附图对本发明做进一步详细描述：Below in conjunction with accompanying drawing, the present invention is described in further detail:

参考图1，本发明所述的高压厂用变分支零序保护配置系统包括高压厂用变高压侧封闭母线1、高压厂用变2、高压厂用变低压侧封闭母线3、高压厂用母线工作进线开关4、高压厂用母线工作进线开关下口CT5、高压厂用母线6、高压厂用变低压侧中性点零序CT7、高压厂用变低压侧中性点接地电阻8及高压厂用变保护装置9；高压厂用变高压侧封闭母线1经高压厂用变2、高压厂用变低压侧封闭母线3及高压厂用母线工作进线开关4与高压厂用母线6相连接，高压厂用母线工作进线开关下口CT5安装于高压厂用母线工作进线开关4与高压厂用母线6之间的线路上，高压厂用变2的低压侧中性点通过高压厂用变低压侧中性点接地电阻8接地，高压厂用变低压侧中性点零序CT7安装于高压厂用变2的低压侧中性点与高压厂用变低压侧中性点接地电阻8之间的线路上，高压厂用变保护装置9与高压厂用母线工作进线开关下口CT5的二次侧及高压厂用变低压侧中性点零序CT7的二次侧相连接，其中，高压厂用变2高压绕组的接线方式为△型接线方式，高压厂用变2低压绕组的接线方式为Y型接线方式。Referring to FIG. 1, the high-voltage factory-use transformer branch zero-sequence protection configuration system according to the present invention includes a high-voltage factory-use transformer high-voltage side closed bus 1, a high-voltage factory transformer 2, a high-voltage factory transformer low-voltage side closed busbar 3, and a high-voltage factory busbar. Working incoming switch 4, high voltage factory busbar working incoming switch lower port CT5, high voltage factory busbar 6, high voltage factory transformer low voltage side neutral point zero sequence CT7, high voltage factory transformer low voltage side neutral point grounding resistance 8 and High-voltage factory transformer protection device 9; high-voltage factory transformer high-voltage side closed busbar 1 passes through high-voltage factory transformer 2, high-voltage factory transformer low-voltage side closed busbar 3 and high-voltage factory busbar working incoming switch 4 and high-voltage factory busbar 6 phase Connection, the lower port CT5 of the high-voltage factory busbar working incoming switch is installed on the line between the high-voltage factory busbar working incoming switch 4 and the high-voltage factory busbar 6, and the neutral point of the low-voltage side of the high-voltage factory transformer 2 passes through the high-voltage factory. The neutral point grounding resistor 8 on the low voltage side of the transformer is grounded, and the neutral point zero sequence CT7 on the low voltage side of the high voltage factory transformer is installed on the neutral point of the low voltage side of the high voltage factory transformer 2 and the neutral point grounding resistor 8 on the low voltage side of the high voltage factory transformer. On the line between, the high-voltage factory transformer protection device 9 is connected with the secondary side of the lower port CT5 of the high-voltage factory busbar working incoming switch and the secondary side of the neutral point zero-sequence CT7 on the low-voltage side of the high-voltage factory transformer. , The wiring mode of the high-voltage plant transformer 2 high-voltage winding is △-type wiring mode, and the wiring mode of the high-voltage factory transformer 2 low-voltage winding is Y-type wiring mode.

一种高压厂用变分支零序保护配置方法，通过高压厂用母线工作进线开关下口CT5的自产零序电流，判断高压厂用变分支零序保护故障区域，实现不同的出口跳闸方式，保护出口仅为一时限，时限按与下一级零序过流保护最长动作时间配合整定，参考图2，具体包括以下步骤：A high-voltage factory branch zero-sequence protection configuration method, through the self-produced zero-sequence current of the lower port CT5 of the high-voltage factory busbar working incoming switch, to determine the high-voltage factory-use variable branch zero-sequence protection fault area, and realize different outlet tripping methods , the protection outlet is only a time limit, and the time limit is set according to the maximum action time of the next-level zero-sequence overcurrent protection. Refer to Figure 2, which includes the following steps:

投入高压厂用变分支零序保护，当高压厂用变低压侧中性点零序CT7的零序电流大于整定值，高压厂用母线工作进线开关下口CT5的自产零序电流小于整定值时，则故障区域在高压厂用变2的低压绕组至高压厂用母线工作进线开关4之间，经保护一时限出口跳闸，出口方式为停机，同时启动备用电源切换；Put into high-voltage factory transformer branch zero-sequence protection, when the zero-sequence current of the neutral point zero-sequence CT7 on the low-voltage side of the high-voltage factory transformer is greater than the set value, the self-produced zero-sequence current of the lower port CT5 of the high-voltage factory busbar working incoming switch is less than the set value When the value is set, the fault area is between the low-voltage winding of the high-voltage factory transformer 2 and the high-voltage factory busbar working incoming switch 4. After a protection time limit, the outlet trips, the outlet mode is shutdown, and the standby power switch is started at the same time;

投入高压厂用变分支零序保护，当高压厂用变低压侧中性点零序CT7零序电流大于整定值，高压厂用母线工作进线开关下口CT5自产零序电流大于整定值时，则故障区域在高压厂用母线工作进线开关4至高压厂用母线6之间，经保护一时限出口跳闸，出口方式为跳高压厂用母线工作进线开关4，同时闭锁备用电源切换。Put into high-voltage factory transformer branch zero-sequence protection, when the zero-sequence current of the neutral point CT7 on the low-voltage side of the high-voltage factory transformer is greater than the set value, and the self-produced zero-sequence current of CT5 at the lower port of the high-voltage factory busbar working incoming switch is greater than the set value , the fault area is between the high-voltage factory busbar working incoming switch 4 and the high-voltage factory busbar 6, and the outlet trips after a time limit of protection.

图3为常规高压厂用变分支零序保护配置图，逻辑图如图4所示，高压厂用变分支零序保护采用零序电流原理，零序电流元件仅选用高压厂用变低压侧中性点零序电流，零序电流保护分为两时限，其中，一时限按与下一级零序过流保护最长动作时间配合整定，出口方式为跳高压厂用母线工作进线开关，同时闭锁备用电源切换，如果一时限动作后，故障仍然存在，则二时限保护动作，出口方式为停机，同时启动备用电源切换。Figure 3 is the configuration diagram of the zero-sequence protection of the conventional high-voltage factory transformer branch, and the logic diagram is shown in Figure 4. The zero-sequence protection of the high-voltage factory transformer branch adopts the principle of zero-sequence current, and the zero-sequence current element is only selected in the low-voltage side of the high-voltage factory transformer. The zero-sequence current of the neutral point, the zero-sequence current protection is divided into two time limits, of which one time limit is set according to the longest action time of the next-level zero-sequence overcurrent protection. Locking the backup power switch, if the fault still exists after the first time limit action, the second time limit protection action, the exit mode is shutdown, and the backup power switch is started at the same time.

Claims (1)

1.一种高压厂用变分支零序保护配置方法，其特征在于，基于高压厂用变分支零序保护配置系统，所述高压厂用变分支零序保护配置系统包括高压厂用变高压侧封闭母线(1)、高压厂用变(2)、高压厂用变低压侧封闭母线(3)、高压厂用母线工作进线开关(4)、高压厂用母线工作进线开关下口CT(5)、高压厂用母线(6)、高压厂用变低压侧中性点零序CT(7)、高压厂用变低压侧中性点接地电阻(8)及高压厂用变保护装置(9)；1. A high-voltage factory-use variable branch zero-sequence protection configuration method, characterized in that, based on a high-voltage factory-use variable-branch zero-sequence protection configuration system, the high-voltage factory-use variable branch zero-sequence protection configuration system comprises a high-voltage factory-use variable-branch zero-sequence protection configuration system. Closed busbar (1), high-voltage factory transformer (2), low-voltage side closed busbar of high-voltage factory transformer (3), high-voltage factory busbar working incoming switch (4), high-voltage factory busbar working incoming switch lower port CT ( 5), high voltage factory busbar (6), high voltage factory transformer low voltage side neutral point zero sequence CT (7), high voltage factory transformer low voltage side neutral point grounding resistance (8) and high voltage factory transformer protection device (9) ); 高压厂用变高压侧封闭母线(1)经高压厂用变(2)、高压厂用变低压侧封闭母线(3)及高压厂用母线工作进线开关(4)与高压厂用母线(6)相连接，高压厂用母线工作进线开关下口CT(5)安装于高压厂用母线工作进线开关(4)与高压厂用母线(6)之间的线路上，高压厂用变(2)的低压侧中性点通过高压厂用变低压侧中性点接地电阻(8)接地，高压厂用变低压侧中性点零序CT(7)安装于高压厂用变(2)的低压侧中性点与高压厂用变低压侧中性点接地电阻(8)之间的线路上，高压厂用变保护装置(9)与高压厂用母线工作进线开关下口CT(5)的二次侧及高压厂用变低压侧中性点零序CT(7)的二次侧相连接；The high-voltage side closed busbar (1) of the high-voltage factory transformer passes through the high-voltage factory transformer (2), the low-voltage side closed busbar (3) of the high-voltage factory transformer, and the working incoming switch (4) of the high-voltage factory busbar and the high-voltage factory busbar (6) ), the lower port CT (5) of the high-voltage factory busbar working incoming switch is installed on the line between the high-voltage factory busbar working incoming switch (4) and the high-voltage factory busbar (6), and the high-voltage factory transformer ( 2) The neutral point of the low-voltage side of the high-voltage utility transformer is grounded through the grounding resistance (8) of the neutral point of the low-voltage side of the high-voltage utility transformer. The zero-sequence CT (7) of the neutral point of the low-voltage side of the high-voltage utility transformer is installed in the On the line between the neutral point of the low-voltage side and the grounding resistance (8) of the neutral point of the low-voltage side of the high-voltage factory transformer, the high-voltage factory transformer protection device (9) and the lower port CT (5) of the high-voltage factory busbar working incoming switch The secondary side of the transformer is connected with the secondary side of the neutral point zero-sequence CT (7) on the low-voltage side of the high-voltage plant; 高压厂用变(2)高压绕组的接线方式为△型接线方式，高压厂用变(2)低压绕组的接线方式为Y型接线方式；(2) The wiring mode of the high-voltage winding of the high-voltage plant transformer is △-type wiring mode, and the wiring mode of the low-voltage winding of the high-voltage factory transformer (2) is the Y-type wiring mode; 包括以下步骤：Include the following steps: 投入高压厂用变分支零序保护，当高压厂用变低压侧中性点零序CT(7)的零序电流大于整定值，高压厂用母线工作进线开关下口CT(5)的自产零序电流小于整定值时，则故障区域在高压厂用变(2)的低压绕组至高压厂用母线工作进线开关(4)之间，经保护一时限出口跳闸，出口方式为停机，同时启动备用电源切换；When the zero-sequence current of the zero-sequence CT (7) of the neutral point zero-sequence CT (7) on the low-voltage side of the high-voltage factory-use transformer is greater than the set value, the automatic voltage of the lower port CT (5) of the high-voltage factory-use busbar working incoming line switch is switched on. When the zero-sequence current is less than the set value, the fault area is between the low-voltage winding of the high-voltage utility transformer (2) and the working incoming switch (4) of the high-voltage utility bus. At the same time, start the standby power switch; 投入高压厂用变分支零序保护，当高压厂用变低压侧中性点零序CT(7)零序电流大于整定值，高压厂用母线工作进线开关下口CT(5)自产零序电流大于整定值时，则故障区域在高压厂用母线工作进线开关(4)至高压厂用母线(6)之间，经保护一时限出口跳闸，出口方式为跳高压厂用母线工作进线开关(4)，同时闭锁备用电源切换。Put into high-voltage factory transformer branch zero-sequence protection, when the zero-sequence current of the neutral point zero-sequence CT (7) on the low-voltage side of the high-voltage factory transformer is greater than the set value, the lower port CT (5) of the high-voltage factory busbar working incoming switch will produce zero sequence by itself. When the sequence current is greater than the set value, the fault area is between the high-voltage factory busbar working incoming switch (4) and the high-voltage factory busbar (6). Line switch (4), at the same time blocking the backup power switch.
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