Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit

Abstract

The invention discloses multipoint earthing trouble shooting equipment for a substation voltage transformer secondary circuit. The multipoint earthing trouble shooting equipment comprises a processor, a display module and at least one pincerlike current transformer. The output end of the pincerlike current transformer is sequentially connected with a signal processing circuit and an analog-digital converter, the output end of the analog-digital converter is connected with a first input end of the processor, and a first output end of the processor is connected with the input end of the display module. According to the multipoint earthing trouble shooting equipment, specific positions where multipoint earthing faults occur in the substation voltage transformer secondary circuit can be quickly and accurately found out, thus a safe and effective finding means for multipoint earthing faults in the voltage transformer secondary circuit can be provided for multiple power generation and power supply enterprises, and safety and stability of an electric system are greatly improved. The multipoint earthing trouble shooting equipment is widely used for the field of fault detection of direct current systems.

Description

technical field [0001] The invention relates to the field of fault detection of a DC system, in particular to a fault finding device for multi-point grounding of a secondary circuit of a voltage transformer of a substation. Background technique [0002] According to the "Key Points of Anti-accident Measures for Relay Protection and Safety Automatic Devices of Electric Power System", it can be known that the secondary circuits of several groups of voltage transformers connected through the zero-phase small busbar (N600) in the control room should only be grounded at one point of N600 in the control room If there are two or more grounding points in the secondary circuit of the voltage transformer, the measured voltage will be affected, and in severe cases, the metering and measurement will be inaccurate, causing the protection device to malfunction. Therefore, people should develop a search device that can quickly determine whether there is a multi-point ground fault in the se...

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Problems solved by technology

[0002] According to the "Key Points of Anti-accident Measures for Relay Protection and Safety Automatic Devices of Electric Power System", it can be known that the secondary circuits of several groups of voltage transformers connected through the zero-phase small busbar (N600) in the control room should only be grounded at one point of N600 in the control room , if there are two or more grounding points in the secondary circuit of the voltage transformer, the measured voltage will be affected, and in severe cases, the metering and measurement will be inaccurate, causing the protection device to malfunction

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