CN107121619B - A kind of electric substation's route protection service without power-off device and repair method - Google Patents
A kind of electric substation's route protection service without power-off device and repair method Download PDFInfo
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Abstract
本发明公开了一种变电所线路保护不停电检修装置及检修方法。该装置包括第二线路保护测控装置、给第二线路保护测控装置供电的电源模块、转换开关QK1和转换开关QK2，转换开关QK1的触点2、触点6、触点10、触点14分别连接有一根第一测试线，转换开关QK1的触点3、触点6、触点9分别与第二线路保护测控装置的三个电流输入端电连接，转换开关QK1的触点16与第二线路保护测控装置的接地端电连接，转换开关QK1的触点1、触点5、触点9、触点13分别连接有一根第二测试线。本发明在对变电所内的线路保护测控装置进行检修时，使用另一个线路保护测控装置代替原有的线路保护测控装置工作，变电所无需断电，不影响用户用电。
The invention discloses an uninterrupted maintenance device and maintenance method for line protection of a substation. The device includes a second line protection measurement and control device, a power supply module for supplying power to the second line protection measurement and control device, a transfer switch QK1 and a transfer switch QK2, and the contact 2, contact 6, contact 10, and contact 14 of the transfer switch QK1 are respectively A first test wire is connected, the contact 3, the contact 6 and the contact 9 of the transfer switch QK1 are respectively electrically connected with the three current input terminals of the second line protection measurement and control device, and the contact 16 of the transfer switch QK1 is electrically connected to the second The ground terminal of the line protection measurement and control device is electrically connected, and the contact 1, the contact 5, the contact 9 and the contact 13 of the transfer switch QK1 are respectively connected with a second test wire. The invention uses another line protection measurement and control device to replace the original line protection measurement and control device when overhauling the line protection measurement and control device in the substation.
Description
技术领域technical field
本发明涉及变电所设备检修技术领域，尤其涉及一种变电所线路保护不停电检修装置及检修方法。The invention relates to the technical field of equipment maintenance of substations, in particular to an uninterrupted maintenance device and maintenance method for line protection of substations.
背景技术Background technique
35KV变电所内设有线路保护测控装置用于监控变电所内的三相电流电压，当三相电流电压异常时控制变电所的断路器断开，保护变电所内的线路。目前，对线路保护测控装置进行检修时，需要将变电所断电，然后对变电所内的线路保护测控装置检修，影响了用户用电。The 35KV substation is equipped with a line protection measurement and control device to monitor the three-phase current and voltage in the substation. When the three-phase current and voltage are abnormal, the circuit breaker of the substation is controlled to be disconnected to protect the lines in the substation. At present, when overhauling the line protection measurement and control device, it is necessary to power off the substation, and then repair the line protection measurement and control device in the substation, which affects the user's electricity consumption.
发明内容SUMMARY OF THE INVENTION
本发明的目的是克服目前对变电所内的线路保护测控装置进行检修时需要对变电所断电，影响用户用电的技术问题，提供了一种变电所线路保护不停电检修装置及检修方法，其在对变电所内的线路保护测控装置进行检修时，使用另一个线路保护测控装置代替原有的线路保护测控装置工作，变电所无需断电，不影响用户用电。The purpose of the present invention is to overcome the technical problem that the current substation needs to be powered off when overhauling the line protection measurement and control device in the substation, which affects the power consumption of users, and provides a substation line protection uninterrupted overhaul device and overhaul The method, when overhauling the line protection measurement and control device in the substation, uses another line protection measurement and control device to replace the original line protection measurement and control device to work, the substation does not need to be powered off, and does not affect the user's electricity consumption.
本发明的一种变电所线路保护不停电检修装置，所述变电所设有第一线路保护测控装置，包括第二线路保护测控装置、给第二线路保护测控装置供电的电源模块、转换开关QK1和转换开关QK2，转换开关QK1的触点2、触点6、触点10、触点14分别连接有一根第一测试线，转换开关QK1的触点3、触点6、触点9分别与第二线路保护测控装置的三个电流输入端电连接，转换开关QK1的触点16与第二线路保护测控装置的接地端电连接，转换开关QK1的触点1、触点5、触点9、触点13分别连接有一根第二测试线，转换开关QK1的触点1与转换开关QK1的触点3及转换开关QK2的触点2、触点4电连接，转换开关QK1的触点5与转换开关QK1的触点7及转换开关QK2的触点6、触点8电连接，转换开关QK1的触点9与转换开关QK1的触点11及转换开关QK2的触点10、触点12电连接，转换开关QK1的触点13与转换开关QK1的触点15及转换开关QK2的触点14、触点16电连接，转换开关QK2的触点1、触点3、触点5、触点7、触点9、触点11、触点13、触点15电连接。The invention provides a non-stop maintenance device for line protection of a substation. The substation is provided with a first line protection measurement and control device, including a second line protection measurement and control device, a power supply module for supplying power to the second line protection measurement and control device, and a conversion device. The switch QK1 and the transfer switch QK2, the contact 2, the contact 6, the contact 10 and the contact 14 of the transfer switch QK1 are respectively connected with a first test line, and the contact 3, the contact 6, the contact 9 of the transfer switch QK1 They are respectively electrically connected with the three current input terminals of the second line protection measurement and control device, the contact 16 of the transfer switch QK1 is electrically connected with the ground terminal of the second line protection measurement and control device, and the contacts 1, 5 and 5 of the transfer switch QK1 are electrically connected. Point 9 and contact 13 are respectively connected with a second test line, the contact 1 of the transfer switch QK1 is electrically connected with the contact 3 of the transfer switch QK1 and the contacts 2 and 4 of the transfer switch QK2, and the contact of the transfer switch QK1 is electrically connected. The point 5 is electrically connected with the contact 7 of the transfer switch QK1 and the contact 6 and the contact 8 of the transfer switch QK2, and the contact 9 of the transfer switch QK1 is electrically connected with the contact 11 of the transfer switch QK1 and the contact 10, the contact The point 12 is electrically connected, the contact 13 of the transfer switch QK1 is electrically connected with the contact 15 of the transfer switch QK1 and the contact 14 and the contact 16 of the transfer switch QK2, and the contact 1, the contact 3 and the contact 5 of the transfer switch QK2 are electrically connected. , Contact 7, Contact 9, Contact 11, Contact 13, Contact 15 are electrically connected.
在本技术方案中，变电所设有第一线路保护测控装置和检测三相电流的三个电流互感器，三个电流互感器的二次侧绕组第一端分别与第一线路保护测控装置的三个电流输入端电连接，电流互感器的二次侧绕组第一端与第一线路保护测控装置的对应电流输入端之间串接有第一电流端子排，电流互感器的二次侧绕组第二端都与地线电连接，第一线路保护测控装置的接地端与地线电连接，第一线路保护测控装置的接地端与地线之间串接有第一电流端子排。In this technical solution, the substation is provided with a first line protection measurement and control device and three current transformers for detecting three-phase currents, and the first ends of the secondary windings of the three current transformers are respectively connected with the first line protection measurement and control device. The three current input terminals of the current transformer are electrically connected, and a first current terminal block is connected in series between the first end of the secondary winding of the current transformer and the corresponding current input terminal of the first line protection measurement and control device, and the secondary side of the current transformer is connected in series. The second end of the winding is electrically connected to the ground wire, the ground terminal of the first line protection measurement and control device is electrically connected to the ground wire, and a first current terminal block is connected in series between the ground end of the first line protection measurement and control device and the ground wire.
要对变电所内的第一线路保护测控装置进行检修时，先将转换开关QK1转动到左边的旁路位置，使得转换开关QK1的触点1、触点2连通，转换开关QK1触点5、触点6连通，转换开关QK1触点9、触点10连通，转换开关QK1触点13、触点14连通；将转换开关QK2转动到中间的退出位置，使得转换开关QK2的触点1、触点2断开，转换开关QK2的触点3、触点4断开，转换开关QK2的触点5、触点6断开，转换开关QK2的触点7、触点8断开，转换开关QK2的触点9、触点10断开，转换开关QK2的触点11、触点12断开，转换开关QK2的触点13、触点14断开，转换开关QK2的触点15、触点16断开；When overhauling the first line protection measurement and control device in the substation, first turn the transfer switch QK1 to the left bypass position, so that the contacts 1 and 2 of the transfer switch QK1 are connected, and the contacts 5 and 5 of the transfer switch QK1 are connected. Contact 6 is connected, contacts 9 and 10 of transfer switch QK1 are connected, and contacts 13 and 14 of transfer switch QK1 are connected; turn transfer switch QK2 to the middle exit position, so that contact 1 and contact of transfer switch QK2 are connected. Point 2 is disconnected, the contacts 3 and 4 of the transfer switch QK2 are disconnected, the contacts 5 and 6 of the transfer switch QK2 are disconnected, the contacts 7 and 8 of the transfer switch QK2 are disconnected, and the transfer switch QK2 The contacts 9 and 10 of the transfer switch are disconnected, the contacts 11 and 12 of the transfer switch QK2 are disconnected, the contacts 13 and 14 of the transfer switch QK2 are disconnected, the contacts 15 and 16 of the transfer switch QK2 disconnect;
接着，将转换开关QK1的触点2连接的第一测试线、触点6连接的第一测试线、触点10连接的第一测试线分别与第一线路保护测控装置的A相电输入端、B相电输入端、C相电输入端电连接，将转换开关QK1的触点1连接的第二测试线、触点5连接的第二测试线、触点9连接的第二测试线分别与三个电流互感器的二次侧绕组第一端电连接，将转换开关QK1的触点14连接的第一测试线与第一线路保护测控装置的接地端电连接，将转换开关QK1的触点13连接的第二测试线与地线电连接；Next, connect the first test line connected to the contact 2 of the transfer switch QK1, the first test line connected to the contact 6, and the first test line connected to the contact 10 to the A-phase electrical input end of the first line protection measurement and control device, respectively. , B-phase electric input terminal, C-phase electric input terminal are electrically connected, and the second test line connected with contact 1 of the transfer switch QK1, the second test line connected with contact 5, and the second test line connected with contact 9 are respectively It is electrically connected to the first ends of the secondary windings of the three current transformers, and the first test wire connected to the contact 14 of the transfer switch QK1 is electrically connected to the ground terminal of the first line protection measurement and control device, and the contact of the transfer switch QK1 is electrically connected. The second test wire connected at point 13 is electrically connected to the ground wire;
然后，将四个第一电流端子排的连接片断开；Then, disconnect the connecting pieces of the four first current terminal rows;
最后，将转换开关QK2转动到左边的短路位置，使得转换开关QK2的触点1、触点2连通，转换开关QK2的触点5、触点6连通，转换开关QK2的触点9、触点10连通，转换开关QK2的触点13、触点14连通；将转换开关QK1转动到右边的工作位置，使得转换开关QK1的触点1、触点2断开，转换开关QK1触点5、触点6断开，转换开关QK1触点9、触点10断开，转换开关QK1触点13、触点14断开，转换开关QK1的触点3、触点4连通，转换开关QK1的触点7、触点8连通，转换开关QK1的触点11、触点12连通，转换开关QK1的触点15、触点16连通，使得第一线路保护测控装置与电流互感器断开，三个电流互感器的二次侧绕组第一端分别与第二线路保护测控装置的三个电流输入端电连接，第二线路保护测控装置代替第一线路保护测控装置监测变电所的三相电流。Finally, turn the transfer switch QK2 to the short-circuit position on the left, so that the contacts 1 and 2 of the transfer switch QK2 are connected, the contacts 5 and 6 of the transfer switch QK2 are connected, and the contacts 9 and 6 of the transfer switch QK2 are connected. 10 is connected, and the contacts 13 and 14 of the transfer switch QK2 are connected; turn the transfer switch QK1 to the right working position, so that the contacts 1 and 2 of the transfer switch QK1 are disconnected, and the contacts 5 and 2 of the transfer switch QK1 are disconnected. Point 6 is disconnected, the contacts 9 and 10 of the transfer switch QK1 are disconnected, the contacts 13 and 14 of the transfer switch QK1 are disconnected, the contacts 3 and 4 of the transfer switch QK1 are connected, and the contacts of the transfer switch QK1 7. The contact 8 is connected, the contacts 11 and 12 of the transfer switch QK1 are connected, and the contacts 15 and 16 of the transfer switch QK1 are connected, so that the first line protection measurement and control device is disconnected from the current transformer, and the three currents are connected. The first ends of the secondary windings of the transformer are respectively electrically connected to the three current input ends of the second line protection measurement and control device, and the second line protection measurement and control device monitors the three-phase current of the substation instead of the first line protection measurement and control device.
此时，第二线路保护测控装置代替第一线路保护测控装置工作，且此时第一线路保护测控装置处于断电状态，工作人员可对第一线路保护测控装置进行检修。At this time, the second line protection measurement and control device works instead of the first line protection measurement and control device, and the first line protection measurement and control device is in a power-off state at this time, and the staff can repair the first line protection measurement and control device.
作为优选，所述一种变电所线路保护不停电检修装置还包括转换开关QK3和转换开关KK，转换开关QK3的触点2、触点6、触点10分别连接有一根第三测试线，转换开关QK3的触点1、触点5、触点9分别连接有一根第四测试线，转换开关QK3的触点2、触点4电连接，转换开关QK3的触点6、触点8电连接，转换开关QK3的触点10、触点12电连接，转换开关QK3的触点3与第二线路保护测控装置的合闸回路输出端电连接，转换开关QK3的触点7与第二线路保护测控装置的分闸回路输出端电连接，转换开关QK3的触点11与第二线路保护测控装置的接地端电连接，转换开关KK的触点1、触点2串接于第二线路保护测控装置的合闸回路中，转换开关KK的触点11、触点12串接于第二线路保护测控装置的分闸回路中。Preferably, the non-stop maintenance device for line protection of a substation further comprises a transfer switch QK3 and a transfer switch KK, and the contact 2, the contact 6 and the contact 10 of the transfer switch QK3 are respectively connected with a third test wire, Contact 1, contact 5, and contact 9 of the transfer switch QK3 are respectively connected with a fourth test wire, the contacts 2 and 4 of the transfer switch QK3 are electrically connected, and the contacts 6 and 8 of the transfer switch QK3 are electrically connected. Connection, the contact 10 and the contact 12 of the transfer switch QK3 are electrically connected, the contact 3 of the transfer switch QK3 is electrically connected to the output end of the closing circuit of the second line protection monitoring and control device, and the contact 7 of the transfer switch QK3 is connected to the second line. The output terminal of the opening circuit of the protection measurement and control device is electrically connected, the contact 11 of the transfer switch QK3 is electrically connected to the ground terminal of the second line protection measurement and control device, and the contact 1 and the contact 2 of the transfer switch KK are connected in series with the second line protection In the closing circuit of the measurement and control device, the contacts 11 and 12 of the transfer switch KK are connected in series in the opening circuit of the second line protection measurement and control device.
第一线路保护测控装置的合闸回路输出端与变电所的断路器的合闸信号输入端电连接，第一线路保护测控装置的分闸回路输出端与变电所的断路器的分闸信号输入端电连接，变电所的断路器的接地端与第一线路保护测控装置的接地端电连接，第一线路保护测控装置的合闸回路输出端与变电所的断路器的合闸信号输入端之间串接有第二电流端子排，第一线路保护测控装置的分闸回路输出端与变电所的断路器的分闸信号输入端之间串接有第二电流端子排，变电所的断路器的接地端与第一线路保护测控装置的接地端之间串接有第二电流端子排。The output terminal of the closing circuit of the first line protection monitoring and control device is electrically connected with the closing signal input terminal of the circuit breaker of the substation, and the output terminal of the opening circuit of the first line protection monitoring and control device is connected to the opening of the circuit breaker of the substation. The signal input terminal is electrically connected, the ground terminal of the circuit breaker of the substation is electrically connected to the ground terminal of the first line protection measurement and control device, and the output terminal of the closing circuit of the first line protection measurement and control device is connected to the closing circuit of the circuit breaker of the substation. A second current terminal block is connected in series between the signal input ends, and a second current terminal block is connected in series between the opening circuit output end of the first line protection monitoring and control device and the opening signal input end of the circuit breaker of the substation. A second current terminal block is connected in series between the grounding end of the circuit breaker of the substation and the grounding end of the first line protection monitoring and control device.
要对变电所内的第一线路保护测控装置进行检修时，还进行下列操作：When overhauling the first line protection measurement and control device in the substation, also perform the following operations:
将转换开关QK3转动到左边的旁路位置，使得转换开关QK3的触点1、触点2连通，转换开关QK3的触点5、触点6连通，转换开关QK3的触点9、触点10连通；Rotate the transfer switch QK3 to the bypass position on the left, so that the contacts 1 and 2 of the transfer switch QK3 are connected, the contacts 5 and 6 of the transfer switch QK3 are connected, and the contacts 9 and 10 of the transfer switch QK3 are connected. connected;
将转换开关QK3的触点2连接的第三测试线与变电所的断路器的合闸信号输入端电连接，将转换开关QK3的触点6连接的第三测试线与变电所的断路器的分闸信号输入端电连接，将转换开关QK3的触点10连接的第三测试线与变电所的断路器的接地端电连接；将转换开关QK3的触点1连接的第四测试线与第一线路保护测控装置的合闸回路输出端电连接，将转换开关QK3的触点5连接的第四测试线与第一线路保护测控装置的分闸回路输出端 电连接，将转换开关QK3的触点9连接的第四测试线与第一线路保护测控装置的接地端电连接；Electrically connect the third test line connected to the contact 2 of the transfer switch QK3 with the closing signal input end of the circuit breaker of the substation, and connect the third test line connected to the contact 6 of the transfer switch QK3 with the open circuit of the substation The opening signal input end of the switch is electrically connected, and the third test line connected to the contact 10 of the transfer switch QK3 is electrically connected to the grounding end of the circuit breaker of the substation; the fourth test is to connect the contact 1 of the transfer switch QK3 The line is electrically connected to the output terminal of the closing circuit of the first line protection measurement and control device, and the fourth test wire connected to the contact 5 of the transfer switch QK3 is electrically connected to the output terminal of the opening circuit of the first line protection measurement and control device, and the transfer switch is electrically connected to the output terminal of the opening circuit. The fourth test line connected to the contact 9 of QK3 is electrically connected to the ground terminal of the first line protection measurement and control device;
将三个第二电流端子排的连接片断开；Disconnect the connecting pieces of the three second current terminal blocks;
将转换开关QK3转动到右边的工作位置，使得转换开关QK3的触点1、触点2断开，转换开关QK3的触点5、触点6断开，转换开关QK3的触点9、触点10断开，转换开关QK3的触点3、触点4连通，转换开关QK3的触点7、触点8连通，转换开关QK3的触点11、触点12连通。Rotate the transfer switch QK3 to the right working position, so that the contacts 1 and 2 of the transfer switch QK3 are disconnected, the contacts 5 and 6 of the transfer switch QK3 are disconnected, and the contacts 9 and 6 of the transfer switch QK3 are disconnected. 10 is disconnected, the contacts 3 and 4 of the transfer switch QK3 are connected, the contacts 7 and 8 of the transfer switch QK3 are connected, and the contacts 11 and 12 of the transfer switch QK3 are connected.
作为优选，所述第二线路保护测控装置为PDS-741A线路保护装置。Preferably, the second line protection measurement and control device is a PDS-741A line protection device.
作为优选，所述一种变电所线路保护不停电检修装置还包括三极双投开关ZK3，三极双投开关ZK3的三个输出端分别与第二线路保护测控装置的三个电压输入端电连接，三极双投开关ZK3的三个输入端分别连接有一根第五测试线，第二线路保护测控装置的中性线端和地线端分别连接有一根第五测试线。检修时，将第二线路保护测控装置的三个电压输入端连接的第五测试线分别与变电所中的三个电压互感器的二次绕组输出端电连接，第二线路保护测控装置的中性线端连接的第五测试线与电压互感器的中性线端电连接，第二线路保护测控装置的地线端连接的第五测试线与电压互感器的地线端电连接。Preferably, the non-stop maintenance device for line protection of a substation further includes a three-pole double-throw switch ZK3, and the three output ends of the three-pole double-throw switch ZK3 are respectively connected with the three voltage input ends of the second line protection measurement and control device. For electrical connection, the three input ends of the three-pole double-throw switch ZK3 are respectively connected with a fifth test line, and the neutral line end and the ground line end of the second line protection monitoring device are respectively connected with a fifth test line. During maintenance, connect the fifth test line connected to the three voltage input terminals of the second line protection measurement and control device to the output terminals of the secondary windings of the three voltage transformers in the substation respectively, and the second line protection measurement and control device. The fifth test wire connected to the neutral wire end is electrically connected to the neutral wire end of the voltage transformer, and the fifth test wire connected to the ground wire end of the second line protection monitoring device is electrically connected to the ground wire end of the voltage transformer.
本发明的一种变电所线路保护不停电检修方法，用于上述的一种变电所线路保护不停电检修装置，所述变电所设有第一线路保护测控装置和检测三相电流的三个电流互感器，三个电流互感器的二次侧绕组第一端分别与第一线路保护测控装置的三个电流输入端电连接，电流互感器的二次侧绕组第一端与第一线路保护测控装置的对应电流输入端之间串接有第一电流端子排，电流互感器的二次侧绕组第二端都与地线电连接，第一线路保护测控装置的接地端与地线电连接，第一线路保护测控装置的接地端与地线之间串接有第一电流端子排，包括以下步骤：An uninterrupted maintenance method for line protection of a substation of the present invention is used for the above-mentioned uninterrupted maintenance device for line protection of a substation. The substation is provided with a first line protection measurement and control device and a three-phase current detection device Three current transformers, the first ends of the secondary windings of the three current transformers are respectively electrically connected with the three current input ends of the first line protection monitoring and control device, and the first ends of the secondary windings of the current transformers are connected to the first A first current terminal block is connected in series between the corresponding current input ends of the line protection measurement and control device, the second end of the secondary winding of the current transformer is electrically connected to the ground wire, and the ground end of the first line protection measurement and control device is connected to the ground wire Electrical connection, a first current terminal block is connected in series between the ground end of the first line protection measurement and control device and the ground wire, including the following steps:
S1：将转换开关QK1转动到左边的旁路位置，使得转换开关QK1的触点1、触点2连通，转换开关QK1触点5、触点6连通，转换开关QK1触点9、触点10连通，转换开关QK1触点13、触点14连通；将转换开关QK2转动到中间的退出位置，使得转换开关QK2的触点1、触点2断开，转换开关QK2的触点3、触点4断开，转换开关QK2的触点5、触点6断开，转换开关QK2的触点7、触点8断开，转换开关QK2的触点9、触点10断开，转换开关QK2的触点11、触点12断开，转换开关QK2的触点13、触点14断开，转换开关QK2的触点15、触点16断开；S1: Rotate the transfer switch QK1 to the left bypass position, so that the contacts 1 and 2 of the transfer switch QK1 are connected, the contacts 5 and 6 of the transfer switch QK1 are connected, and the contacts 9 and 10 of the transfer switch QK1 are connected. Connected, the contact 13 and contact 14 of the transfer switch QK1 are connected; turn the transfer switch QK2 to the middle exit position, so that the contacts 1 and 2 of the transfer switch QK2 are disconnected, and the contacts 3 and 2 of the transfer switch QK2 are connected. 4 is disconnected, the contacts 5 and 6 of the transfer switch QK2 are disconnected, the contacts 7 and 8 of the transfer switch QK2 are disconnected, the contacts 9 and 10 of the transfer switch QK2 are disconnected, and the Contact 11 and contact 12 are disconnected, contacts 13 and 14 of transfer switch QK2 are disconnected, and contacts 15 and 16 of transfer switch QK2 are disconnected;
S2：将转换开关QK1的触点2连接的第一测试线、触点6连接的第一测试线、触点10连接的第一测试线分别与第一线路保护测控装置的A相电输入端、B相电输入端、C相电输入端电连接，将转换开关QK1的触点1连接的第二测试线、触点5连接的第二测试线、触点9连接的第二测试线分别与三个电流互感器的二次侧绕组第一端电连接，将转换开关QK1的触点14连接的第一测试线与第一线路保护测控装置的接地端电连接，将转换开关QK1的触点13连接的第二测试线与地线电连接；S2: Connect the first test line connected to the contact 2 of the transfer switch QK1, the first test line connected to the contact 6, and the first test line connected to the contact 10 to the A-phase electrical input terminal of the first line protection measurement and control device, respectively , B-phase electric input terminal, C-phase electric input terminal are electrically connected, and the second test line connected with contact 1 of the transfer switch QK1, the second test line connected with contact 5, and the second test line connected with contact 9 are respectively It is electrically connected to the first ends of the secondary windings of the three current transformers, and the first test wire connected to the contact 14 of the transfer switch QK1 is electrically connected to the ground terminal of the first line protection measurement and control device, and the contact of the transfer switch QK1 is electrically connected. The second test wire connected at point 13 is electrically connected to the ground wire;
S3：将四个第一电流端子排的连接片断开；S3: Disconnect the connecting pieces of the four first current terminal blocks;
S4：将转换开关QK2转动到左边的短路位置，使得转换开关QK2的触点1、触点2连通，转换开关QK2的触点5、触点6连通，转换开关QK2的触点9、触点10连通，转换开关QK2的触点13、触点14连通；将转换开关QK1转动到右边的工作位置，使得转换开关QK1的触点1、触点2断开，转换开关QK1触点5、触点6断开，转换开关QK1触点9、触点10断开，转换开关QK1触点13、触点14断开，转换开关QK1的触点3、触点4连通，转换开关QK1的触点7、触点8连通，转换开关QK1的触点11、触点12连通，转换开关QK1的触点15、触点16连通，使得第一线路保护测控装置与电流互感器断开，三个电流互感器的二次侧绕组第一端分别与第二线路保护测控装置的三个电流输入端电连接，第二线路保护测控装置代替第一线路保护测控装置监测变电所的三相电流。S4: Rotate the transfer switch QK2 to the short-circuit position on the left, so that the contacts 1 and 2 of the transfer switch QK2 are connected, the contacts 5 and 6 of the transfer switch QK2 are connected, and the contacts 9 and 6 of the transfer switch QK2 are connected. 10 is connected, and the contacts 13 and 14 of the transfer switch QK2 are connected; turn the transfer switch QK1 to the right working position, so that the contacts 1 and 2 of the transfer switch QK1 are disconnected, and the contacts 5 and 2 of the transfer switch QK1 are disconnected. Point 6 is disconnected, the contacts 9 and 10 of the transfer switch QK1 are disconnected, the contacts 13 and 14 of the transfer switch QK1 are disconnected, the contacts 3 and 4 of the transfer switch QK1 are connected, and the contacts of the transfer switch QK1 7. The contact 8 is connected, the contacts 11 and 12 of the transfer switch QK1 are connected, and the contacts 15 and 16 of the transfer switch QK1 are connected, so that the first line protection measurement and control device is disconnected from the current transformer, and the three currents are connected. The first ends of the secondary windings of the transformer are respectively electrically connected to the three current input ends of the second line protection measurement and control device, and the second line protection measurement and control device monitors the three-phase current of the substation instead of the first line protection measurement and control device.
作为优选，第一线路保护测控装置的合闸回路输出端与变电所的断路器的合闸信号输入端电连接，第一线路保护测控装置的分闸回路输出端与变电所的断路器的分闸信号输入端电连接，变电所的断路器的接地端与第一线路保护测控装置的接地端电连接，第一线路保护测控装置的合闸回路输出端与变电所的断路器的合闸信号输入端之间串接有第二电流端子排，第一线路保护测控装置的分闸回路输出端与变电所的断路器的分闸信号输入端之间串接有第二电流端子排，变电所的断路器的接地端与第一线路保护测控装置的接地端之间串接有第二电流端子排，所述一种变电所线路保护不停电检修方法还包括以下步骤：Preferably, the closing circuit output end of the first line protection monitoring and control device is electrically connected to the closing signal input end of the circuit breaker of the substation, and the opening circuit output end of the first line protection monitoring and control device is electrically connected to the circuit breaker of the substation. The input terminal of the opening signal is electrically connected, the ground terminal of the circuit breaker of the substation is electrically connected to the ground terminal of the first line protection measurement and control device, and the output terminal of the closing circuit of the first line protection measurement and control device is electrically connected to the circuit breaker of the substation A second current terminal block is connected in series between the closing signal input ends of the circuit breaker, and a second current is connected in series between the opening circuit output end of the first line protection measurement and control device and the opening signal input end of the circuit breaker of the substation. A terminal block, a second current terminal block is connected in series between the grounding end of the circuit breaker of the substation and the grounding end of the first line protection measurement and control device, and the method for uninterrupted maintenance of the line protection of the substation further comprises the following steps :
S5：将转换开关QK3转动到左边的旁路位置，使得转换开关QK3的触点1、触点2连通，转换开关QK3的触点5、触点6连通，转换开关QK3的触点9、触点10连通；S5: Rotate the transfer switch QK3 to the left bypass position, so that the contacts 1 and 2 of the transfer switch QK3 are connected, the contacts 5 and 6 of the transfer switch QK3 are connected, and the contacts 9 and 6 of the transfer switch QK3 are connected. point 10 connected;
S6：将转换开关QK3的触点2连接的第三测试线与变电所的断路器的合闸信号输入端电连接，将转换开关QK3的触点6连接的第三测试线与变电所的断路器的分闸信号输入端电连接，将转换开关QK3的触点10连接的第三测试线与变电所的断路器的接地端电连接；将转换开关QK3的触点1连接的第四测试线与第一线路保护测控装置的合闸回路输出端电连接，将转换开关QK3的触点5连接的第四测试线与第一线路保护测控装置的分闸回路输出端电连接，将转换开关QK3的触点9连接的第四测试线与第一线路保护测控装置的接地端电连接；S6: Electrically connect the third test line connected to the contact 2 of the transfer switch QK3 with the closing signal input end of the circuit breaker of the substation, and connect the third test line connected to the contact 6 of the transfer switch QK3 with the substation The opening signal input end of the circuit breaker is electrically connected, and the third test line connected to the contact 10 of the transfer switch QK3 is electrically connected to the grounding end of the circuit breaker of the substation; the third test line that connects the contact 1 of the transfer switch QK3 The four test wires are electrically connected to the output terminal of the closing circuit of the first line protection measurement and control device, and the fourth test wire connected to the contact 5 of the transfer switch QK3 is electrically connected to the output terminal of the opening circuit of the first circuit protection measurement and control device, and The fourth test line connected to the contact 9 of the transfer switch QK3 is electrically connected to the ground terminal of the first line protection measurement and control device;
S7：将三个第二电流端子排的连接片断开；S7: Disconnect the connecting pieces of the three second current terminal blocks;
S8：将转换开关QK3转动到右边的工作位置，使得转换开关QK3的触点1、触点2断开，转换开关QK3的触点5、触点6断开，转换开关QK3的触点9、触点10断开，转换开关QK3的触点3、触点4连通，转换开关QK3的触点7、触点8连通，转换开关QK3的触点11、触点12连通。S8: Rotate the transfer switch QK3 to the right working position, so that the contacts 1 and 2 of the transfer switch QK3 are disconnected, the contacts 5 and 6 of the transfer switch QK3 are disconnected, and the contacts 9 and 6 of the transfer switch QK3 are disconnected. Contact 10 is disconnected, contacts 3 and 4 of transfer switch QK3 are connected, contacts 7 and 8 of transfer switch QK3 are connected, and contacts 11 and 12 of transfer switch QK3 are connected.
作为优选，对第一线路保护测控装置检修完成后执行以下步骤：Preferably, the following steps are performed after the maintenance of the first line protection measurement and control device is completed:
M1：将转换开关QK2转动到左边的短路位置，将转换开关QK1转动到左边的旁路位置；M1: Turn the transfer switch QK2 to the short-circuit position on the left, and turn the transfer switch QK1 to the bypass position on the left;
M2：将转换开关QK2转动到中间的退出位置；M2: Turn the transfer switch QK2 to the middle exit position;
M3：将四个第一电流端子排的连接片连通；M3: Connect the connecting pieces of the four first current terminal blocks;
M4：将第一测试线和第二测试线拆除；M4: Remove the first test line and the second test line;
M5：将转换开关QK1转动到中间的退出位置；M5: Turn the transfer switch QK1 to the middle exit position;
M6：将转换开关QK3转动到左边的旁路位置；M6: Turn the transfer switch QK3 to the bypass position on the left;
M7：将三个第二电流端子排的连接片连通；M7: Connect the connecting pieces of the three second current terminal blocks;
M8：将第三测试线和第四测试线拆除；M8: Remove the third test line and the fourth test line;
M9：将转换开关QK3转动到中间的退出位置。M9: Turn the transfer switch QK3 to the middle exit position.
本发明的有益效果是：在对变电所内的线路保护测控装置进行检修时，使用另一个线路保护测控装置代替原有的线路保护测控装置工作，变电所无需断电，不影响用户用电。The beneficial effects of the invention are: when the line protection and measurement and control device in the substation is repaired, another line protection and measurement and control device is used to replace the original line protection and measurement and control device to work, the substation does not need to be powered off, and does not affect the electricity consumption of users .
附图说明Description of drawings
图1是本发明与变电所的电流互感器端连接的一种电路连接图；Fig. 1 is a kind of circuit connection diagram that the present invention is connected with the current transformer end of the substation;
图2是本发明与变电所的断路器端连接的一种电路连接图；Fig. 2 is a circuit connection diagram of the present invention connected with the circuit breaker end of the substation;
图3是电源模块与第二线路保护测控装置连接的一种电路连接图；Fig. 3 is a kind of circuit connection diagram of the connection between the power supply module and the second line protection measurement and control device;
图4是本发明与变电所的电压互感器端连接的一种电路连接图。Fig. 4 is a circuit connection diagram of the present invention connected to the voltage transformer terminal of the substation.
图中：1、第一线路保护测控装置，2、第二线路保护测控装置，3、电源模块，4、电流互感器，5、第一电流端子排，6、断路器，7、第二电流端子排。In the figure: 1, the first line protection measurement and control device, 2, the second line protection measurement and control device, 3, the power module, 4, the current transformer, 5, the first current terminal block, 6, the circuit breaker, 7, the second current Terminal block.
具体实施方式Detailed ways
下面通过实施例，并结合附图，对本发明的技术方案作进一步具体的说明。The technical solutions of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.
实施例：本实施例的一种变电所线路保护不停电检修装置，如图1、图2、图3所示，包括第二线路保护测控装置2、给第二线路保护测控装置2供电的电源模块3、转换开关QK1、转换开关QK2、转换开关QK3和转换开关KK，转换开关QK1的触点2、触点6、触点10、触点14分别连接有一根第一测试线，转换开关QK1的触点3、触点6、触点9分别与第二线路保护测控装置2的三个电流输入端电连接，转换开关QK1的触点16与第二线路保护测控装置2的接地端电连接，转换开关QK1的触点1、触点5、触点9、触点13分别连接有一根第二测试线，转换开关QK1的触点1与转换开关QK1的触点3及转换开关QK2的触点2、触点4电连接，转换开关QK1的触点5与转换开关QK1的触点7及转换开关QK2的触点6、触点8电连接，转换开关QK1的触点9与转换开关QK1的触点11及转换开关QK2的触点10、触点12电连接，转换开关QK1的触点13与转换开关QK1的触点15及转换开关QK2的触点14、触点16电连接，转换开关QK2的触点1、触点3、触点5、触点7、触点9、触点11、触点13、触点15电连接；Example: A non-stop maintenance device for line protection of a substation in this example, as shown in Figure 1, Figure 2, Figure 3, includes a second line protection measurement and control device 2, and a power supply for the second line protection measurement and control device 2. The power module 3, the transfer switch QK1, the transfer switch QK2, the transfer switch QK3 and the transfer switch KK, the contact 2, the contact 6, the contact 10 and the contact 14 of the transfer switch QK1 are respectively connected with a first test line, the transfer switch Contact 3, contact 6, and contact 9 of QK1 are respectively electrically connected to the three current input terminals of the second line protection measurement and control device 2, and the contact 16 of the transfer switch QK1 is electrically connected to the ground terminal of the second line protection measurement and control device 2. Connection, contact 1, contact 5, contact 9, and contact 13 of the transfer switch QK1 are respectively connected with a second test line, the contact 1 of the transfer switch QK1 and the contact 3 of the transfer switch QK1 and the transfer switch QK2. The contacts 2 and 4 are electrically connected, the contact 5 of the transfer switch QK1 is electrically connected with the contact 7 of the transfer switch QK1 and the contacts 6 and 8 of the transfer switch QK2, and the contact 9 of the transfer switch QK1 is electrically connected with the transfer switch Contact 11 of QK1 and contacts 10 and 12 of transfer switch QK2 are electrically connected, and contact 13 of transfer switch QK1 is electrically connected to contact 15 of transfer switch QK1 and contacts 14 and 16 of transfer switch QK2, Contact 1, contact 3, contact 5, contact 7, contact 9, contact 11, contact 13, and contact 15 of the transfer switch QK2 are electrically connected;
转换开关QK3的触点2、触点6、触点10分别连接有一根第三测试线，转换开关QK3的触点1、触点5、触点9分别连接有一根第四测试线，转换开关QK3的触点2、触点4电连接，转换开关QK3的触点6、触点8电连接，转换开关QK3的触点10、触点12电连接，转换开关QK3的触点3与第二线路保护测控装置的合闸回路输出端电连接，转换开关QK3的触点7与第二线路保护测控装置的分闸回路输出端电连接，转换开关QK3的触点11与第二线路保护测控装置的接地端电连接，转换开关KK的触点1、触点2串接于第二线路保护测控装置的合闸回路中，转换开关KK的触点11、触点12串接于第二线路保护测控装置的分闸回路中。Contact 2, contact 6, and contact 10 of transfer switch QK3 are respectively connected with a third test line, and contact 1, contact 5, and contact 9 of transfer switch QK3 are respectively connected with a fourth test line. Contacts 2 and 4 of QK3 are electrically connected, contacts 6 and 8 of transfer switch QK3 are electrically connected, contacts 10 and 12 of transfer switch QK3 are electrically connected, and contacts 3 and 2 of transfer switch QK3 The output terminal of the closing circuit of the line protection measurement and control device is electrically connected, the contact 7 of the transfer switch QK3 is electrically connected to the output terminal of the opening circuit of the second line protection measurement and control device, and the contact 11 of the transfer switch QK3 is connected to the second line protection measurement and control device. The ground terminal of the transfer switch KK is electrically connected, the contact 1 and the contact 2 of the transfer switch KK are connected in series in the closing circuit of the second line protection monitoring and control device, and the contact 11 and the contact 12 of the transfer switch KK are connected in series with the second line protection In the opening circuit of the measurement and control device.
变电所设有第一线路保护测控装置和检测三相电流的三个电流互感器，三个电流互感器的二次侧绕组第一端分别与第一线路保护测控装置的三个电流输入端电连接，电流互感器的二次侧绕组第一端与第一线路保护测控装置的对应电流输入端之间串接有第一电流端子排，电流互感器的二次侧绕组第二端都与地线电连接，第一线路保护测控装置的接地端与地线电连接，第一线路保护测控装置的接地端与地线之间串接有第一电流端子排；第一线路保护测控装置的合闸回路输出端与变电所的断路器的合闸信号输入端电连接，第一线路保护测控装置的分闸回路输出端与变电所的断路器的分闸信号输入端电连接，变电所的断路器的接地端与第一线路保护测控装置的接地端电连接，第一线路保护测控装置的合闸回路输出端与变电所的断路器的合闸信号输入端之间串接有第二电流端子排，第一线路保护测控装置的分闸回路输出端与变电所的断路器的分闸信号输入端之间串接有第二电流端子排，变电所的断路器的接地端与第一线路保护测控装置的接地端之间串接有第二电流端子排。The substation is provided with a first line protection measurement and control device and three current transformers for detecting three-phase currents. The first ends of the secondary windings of the three current transformers are respectively connected with the three current input ends of the first line protection measurement and control device. Electrical connection, a first current terminal block is connected in series between the first end of the secondary winding of the current transformer and the corresponding current input end of the first line protection measurement and control device, and the second end of the secondary winding of the current transformer is connected to The ground wire is electrically connected, the ground terminal of the first line protection measurement and control device is electrically connected to the ground wire, and a first current terminal block is connected in series between the ground terminal of the first line protection measurement and control device and the ground wire; The output end of the closing circuit is electrically connected with the closing signal input end of the circuit breaker of the substation, and the output end of the opening circuit of the first line protection monitoring and control device is electrically connected with the opening signal input end of the circuit breaker of the substation. The grounding end of the circuit breaker of the power station is electrically connected with the grounding end of the first line protection monitoring and control device, and the closing circuit output end of the first line protection monitoring and control device is connected in series with the closing signal input end of the circuit breaker of the substation There is a second current terminal row, a second current terminal row is connected in series between the output terminal of the opening circuit of the first line protection measurement and control device and the opening signal input terminal of the circuit breaker of the substation, and the circuit breaker of the substation is connected in series. A second current terminal block is connected in series between the ground terminal and the ground terminal of the first line protection monitoring and control device.
第二线路保护测控装置2为PDS-741A线路保护装置。The second line protection measurement and control device 2 is a PDS-741A line protection device.
如图4所示，还包括三极双投开关ZK3，三极双投开关ZK3的三个输出端分别与第二线路保护测控装置的三个电压输入端电连接，三极双投开关ZK3的三个输入端分别连接有一根第五测试线，第二线路保护测控装置的中性线端和地线端分别连接有一根第五测试线。检修时，将第二线路保护测控装置的三个电压输入端连接的第五测试线分别与变电所中的三个电压互感器的二次绕组输出端电连接，第二线路保护测控装置的中性线端连接的第五测试线与电压互感器的中性线端电连接，第二线路保护测控装置的地线端连接的第五测试线与电压互感器的地线端电连接。As shown in Figure 4, it also includes a three-pole double-throw switch ZK3, the three output terminals of the three-pole double-throw switch ZK3 are respectively electrically connected with the three voltage input terminals of the second line protection measurement and control device, and the three-pole double-throw switch ZK3 The three input ends are respectively connected with a fifth test line, and the neutral line end and the ground line end of the second line protection and monitoring device are respectively connected with a fifth test line. During maintenance, connect the fifth test line connected to the three voltage input terminals of the second line protection measurement and control device to the output terminals of the secondary windings of the three voltage transformers in the substation respectively, and the second line protection measurement and control device. The fifth test wire connected to the neutral wire end is electrically connected to the neutral wire end of the voltage transformer, and the fifth test wire connected to the ground wire end of the second line protection monitoring device is electrically connected to the ground wire end of the voltage transformer.
本实施例的一种变电所线路保护不停电检修方法，用于上述的一种变电所线路保护不停电检修装置，包括以下步骤：An uninterrupted maintenance method for line protection of a substation of the present embodiment is used for the above-mentioned uninterrupted maintenance device for line protection of a substation, and includes the following steps:
S1：将转换开关QK1转动到左边的旁路位置，使得转换开关QK1的触点1、触点2连通，转换开关QK1触点5、触点6连通，转换开关QK1触点9、触点10连通，转换开关QK1触点13、触点14连通；将转换开关QK2转动到中间的退出位置，使得转换开关QK2的触点1、触点2断开，转换开关QK2的触点3、触点4断开，转换开关QK2的触点5、触点6断开，转换开关QK2的触点7、触点8断开，转换开关QK2的触点9、触点10断开，转换开关QK2的触点11、触点12断开，转换开关QK2的触点13、触点14断开，转换开关QK2的触点15、触点16断开；S1: Rotate the transfer switch QK1 to the left bypass position, so that the contacts 1 and 2 of the transfer switch QK1 are connected, the contacts 5 and 6 of the transfer switch QK1 are connected, and the contacts 9 and 10 of the transfer switch QK1 are connected. Connected, the contact 13 and contact 14 of the transfer switch QK1 are connected; turn the transfer switch QK2 to the middle exit position, so that the contacts 1 and 2 of the transfer switch QK2 are disconnected, and the contacts 3 and 2 of the transfer switch QK2 are connected. 4 is disconnected, the contacts 5 and 6 of the transfer switch QK2 are disconnected, the contacts 7 and 8 of the transfer switch QK2 are disconnected, the contacts 9 and 10 of the transfer switch QK2 are disconnected, and the Contact 11 and contact 12 are disconnected, contacts 13 and 14 of transfer switch QK2 are disconnected, and contacts 15 and 16 of transfer switch QK2 are disconnected;
S2：将转换开关QK1的触点2连接的第一测试线、触点6连接的第一测试线、触点10连接的第一测试线分别与第一线路保护测控装置的A相电输入端、B相电输入端、C相电输入端电连接，将转换开关QK1的触点1连接的第二测试线、触点5连接的第二测试线、触点9连接的第二测试线分别与三个电流互感器的二次侧绕组第一端电连接，将转换开关QK1的触点14连接的第一测试线与第一线路保护测控装置的接地端电连接，将转换开关QK1的触点13连接的第二测试线与地线电连接；S2: Connect the first test line connected to the contact 2 of the transfer switch QK1, the first test line connected to the contact 6, and the first test line connected to the contact 10 to the A-phase electrical input terminal of the first line protection measurement and control device, respectively , B-phase electric input terminal, C-phase electric input terminal are electrically connected, and the second test line connected with contact 1 of the transfer switch QK1, the second test line connected with contact 5, and the second test line connected with contact 9 are respectively It is electrically connected to the first ends of the secondary windings of the three current transformers, and the first test wire connected to the contact 14 of the transfer switch QK1 is electrically connected to the ground terminal of the first line protection measurement and control device, and the contact of the transfer switch QK1 is electrically connected. The second test wire connected at point 13 is electrically connected to the ground wire;
S3：将四个第一电流端子排的连接片断开；S3: Disconnect the connecting pieces of the four first current terminal blocks;
S4：将转换开关QK2转动到左边的短路位置，使得转换开关QK2的触点1、触点2连通，转换开关QK2的触点5、触点6连通，转换开关QK2的触点9、触点10连通，转换开关QK2的触点13、触点14连通；将转换开关QK1转动到右边的工作位置，使得转换开关QK1的触点1、触点2断开，转换开关QK1触点5、触点6断开，转换开关QK1触点9、触点10断开，转换开关QK1触点13、触点14断开，转换开关QK1的触点3、触点4连通，转换开关QK1的触点7、触点8连通，转换开关QK1的触点11、触点12连通，转换开关QK1的触点15、触点16连通，使得第一线路保护测控装置与电流互感器断开，三个电流互感器的二次侧绕组第一端分别与第二线路保护测控装置的三个电流输入端电连接，第二线路保护测控装置代替第一线路保护测控装置监测变电所的三相电流；S4: Rotate the transfer switch QK2 to the short-circuit position on the left, so that the contacts 1 and 2 of the transfer switch QK2 are connected, the contacts 5 and 6 of the transfer switch QK2 are connected, and the contacts 9 and 6 of the transfer switch QK2 are connected. 10 is connected, and the contacts 13 and 14 of the transfer switch QK2 are connected; turn the transfer switch QK1 to the right working position, so that the contacts 1 and 2 of the transfer switch QK1 are disconnected, and the contacts 5 and 2 of the transfer switch QK1 are disconnected. Point 6 is disconnected, the contacts 9 and 10 of the transfer switch QK1 are disconnected, the contacts 13 and 14 of the transfer switch QK1 are disconnected, the contacts 3 and 4 of the transfer switch QK1 are connected, and the contacts of the transfer switch QK1 7. The contact 8 is connected, the contacts 11 and 12 of the transfer switch QK1 are connected, and the contacts 15 and 16 of the transfer switch QK1 are connected, so that the first line protection measurement and control device is disconnected from the current transformer, and the three currents are connected. The first ends of the secondary side windings of the transformer are respectively electrically connected with the three current input ends of the second line protection measurement and control device, and the second line protection measurement and control device monitors the three-phase current of the substation instead of the first line protection measurement and control device;
S5：将转换开关QK3转动到左边的旁路位置，使得转换开关QK3的触点1、触点2连通，转换开关QK3的触点5、触点6连通，转换开关QK3的触点9、触点10连通；S5: Rotate the transfer switch QK3 to the left bypass position, so that the contacts 1 and 2 of the transfer switch QK3 are connected, the contacts 5 and 6 of the transfer switch QK3 are connected, and the contacts 9 and 6 of the transfer switch QK3 are connected. point 10 connected;
S6：将转换开关QK3的触点2连接的第三测试线与变电所的断路器的合闸信号输入端电连接，将转换开关QK3的触点6连接的第三测试线与变电所的断路器的分闸信号输入端电连接，将转换开关QK3的触点10连接的第三测试线与变电所的断路器的接地端电连接；将转换开关QK3的触点1连接的第四测试线与第一线路保护测控装置的合闸回路输出端电连接，将转换开关QK3的触点5连接的第四测试线与第一线路保护测控装置的分闸回路输出端电连接，将转换开关QK3的触点9连接的第四测试线与第一线路保护测控装置的接地端电连接；S6: Electrically connect the third test line connected to the contact 2 of the transfer switch QK3 with the closing signal input end of the circuit breaker of the substation, and connect the third test line connected to the contact 6 of the transfer switch QK3 with the substation The opening signal input end of the circuit breaker is electrically connected, and the third test line connected to the contact 10 of the transfer switch QK3 is electrically connected to the grounding end of the circuit breaker of the substation; the third test line that connects the contact 1 of the transfer switch QK3 The four test wires are electrically connected to the output terminal of the closing circuit of the first line protection measurement and control device, and the fourth test wire connected to the contact 5 of the transfer switch QK3 is electrically connected to the output terminal of the opening circuit of the first circuit protection measurement and control device, and The fourth test line connected to the contact 9 of the transfer switch QK3 is electrically connected to the ground terminal of the first line protection measurement and control device;
S7：将三个第二电流端子排的连接片断开；S7: Disconnect the connecting pieces of the three second current terminal blocks;
S8：将转换开关QK3转动到右边的工作位置，使得转换开关QK3的触点1、触点2断开，转换开关QK3的触点5、触点6断开，转换开关QK3的触点9、触点10断开，转换开关QK3的触点3、触点4连通，转换开关QK3的触点7、触点8连通，转换开关QK3的触点11、触点12连通。S8: Rotate the transfer switch QK3 to the right working position, so that the contacts 1 and 2 of the transfer switch QK3 are disconnected, the contacts 5 and 6 of the transfer switch QK3 are disconnected, and the contacts 9 and 6 of the transfer switch QK3 are disconnected. Contact 10 is disconnected, contacts 3 and 4 of transfer switch QK3 are connected, contacts 7 and 8 of transfer switch QK3 are connected, and contacts 11 and 12 of transfer switch QK3 are connected.
此时，第二线路保护测控装置代替第一线路保护测控装置工作，且此时第一线路保护测控装置处于断电状态，工作人员可对第一线路保护测控装置进行检修。At this time, the second line protection measurement and control device works instead of the first line protection measurement and control device, and the first line protection measurement and control device is in a power-off state at this time, and the staff can repair the first line protection measurement and control device.
对第一线路保护测控装置检修完成后通过以下步骤将检修装置退出：After the maintenance of the first line protection measurement and control device is completed, exit the maintenance device through the following steps:
M1：将转换开关QK2转动到左边的短路位置，将转换开关QK1转动到左边的旁路位置；M1: Turn the transfer switch QK2 to the short-circuit position on the left, and turn the transfer switch QK1 to the bypass position on the left;
M2：将转换开关QK2转动到中间的退出位置；M2: Turn the transfer switch QK2 to the middle exit position;
M3：将四个第一电流端子排的连接片连通；M3: Connect the connecting pieces of the four first current terminal blocks;
M4：将第一测试线和第二测试线拆除；M4: Remove the first test line and the second test line;
M5：将转换开关QK1转动到中间的退出位置；M5: Turn the transfer switch QK1 to the middle exit position;
M6：将转换开关QK3转动到左边的旁路位置；M6: Turn the transfer switch QK3 to the bypass position on the left;
M7：将三个第二电流端子排的连接片连通；M7: Connect the connecting pieces of the three second current terminal blocks;
M8：将第三测试线和第四测试线拆除；M8: Remove the third test line and the fourth test line;
M9：将转换开关QK3转动到中间的退出位置。M9: Turn the transfer switch QK3 to the middle exit position.
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