Transformer neutral point knife switch remote integrated control circuit

Abstract

A transformer neutral point switch remote comprehensive control circuit belongs to the technical field of a switch control circuit. A normally open contact of a remote control power supply relay is connected to both ends of an air switch in parallel. After a branch of a change-over switch is serially connected to a normally open contact of a remote control switching-on relay, the branch of the change-over switch and the normally open contact of the remote control switching-on relay are connected to both ends of a normally open contact of a switching-on contactor. After the other branch of the change-over switch is serially connected to a switching-on button, the other branch of the change-over switch and the switching-on button are also connected to the both ends of the normally open contact of the switching-on contactor. One end of a switching-off button is connected between the change-over switch and the switching-on button, and the other end of the switching-off button is connected between a normally open contact of a switching-off contactor and a coil of the switching-off contactor. One end of a normally open contact of a remote control switching-off relay is connected between the normally open contact of the remote control switching-on relay and the change-over switch, and the other end of the normally open contact of the remote control switching-off relay is connected between the normally open contact of the switching-off contactor and the coil of the switching-off contactor. The legal, fast and reliable switch remote control operation is realized, and the advantage of remote operation at a distant place is fully played.

Description

technical field [0001] The invention belongs to the technical field of switch control circuits and relates to a remote integrated control circuit for a neutral point switch of a transformer. Background technique [0002] In the large-scale operation mode, it has become normal for the supervisor of the control center to complete the power-off and power-off operation of the transformer in the remote remote operation mode, and it is increasingly playing an important role, but there are still the following difficulties and deficiencies: [0003] ① Operation and maintenance personnel are required to come to the station to cooperate with the operation, and the advantages of remote control operation cannot be fully utilized: "Hebei Electric Power Company Transformation Operation Regulations" stipulates that "when switching on and off 110kV and above transformers, the neutral point should be grounded first, and then switched on It is also stipulated that "after the operation of the ...

AI Technical Summary

Problems solved by technology

[0003] ① Operation and maintenance personnel are required to come to the station to cooperate with the operation, and the advantages of remote control operation cannot be fully utilized: "Hebei Electric Power Company Transformation Operation Regulations" stipulates that "when switching on and off 110kV and above transformers, the neutral point should be grounded first, and then switched on It is also stipulated that "after the operation of the isolating switch of the electric mechanism (the isolating switch of non-GIS equipment) is completed, the motor power supply of the isolating switch should be disconnected". Therefore, under normal circumstances, the neutral point switch of each substation transformer (hereinafter referred to as The motor power supply of the "knife switch") is in the disconnected position and does not have the conditions for remote control operation. Therefore, when performing the remote control shutdown and power transmission operation of the transformer, the operation and maintenance personnel need to go to the station to cooperate with the switching operation of the switch motor power supply, which makes the remote control operation advantageous. nothing left;

[0004] ②During emergency response to accidents, there are technical and management difficulties in the remote operation of transformers: if the remote control operation is performed after closing the knife switch according to the requirements of the regulations, it is necessary to wait for the operation and maintenance personnel to arrive at the station before operating, which will cause delays in the accident handling work , resulting in serious damage to the equipment or the inability to quickly restore power supply, which is obviously not realistic; if the requirements of the regulations are not considered, and the switch is not closed, that is, the neutral point is not grounded, the remote control of the transformer to stop the power transmission operation will be unrealistic. In the process of remote control operation, the transformer may be damaged or its life shortened due to the generation of operating overvoltage, resulting in man-made accidents. Therefore, how to ensure the safe, standardized and efficient operation of remote control transformer power-off and transmission has become a difficult problem.

Images