Transformer substation circuit breaker tripping and closing loop accurate monitoring device and method

Abstract

The invention provides a transformer substation tripping and closing loop accurate monitoring device and method. The device comprises a tripping and closing loop, a test loop, a linear power amplifier, a DA module, an FPGA, a power resistor, a first path signal amplification module, a first path AD acquisition module, a Hall sensor, a second path signal amplification module, a second path AD acquisition module, a temperature and humidity sensor and an input module. According to the invention, the tripping and closing loop current of the transformer substation is accurately monitored, the tripping and closing states can be recognized, the situation that the tripping and closing loop current is abnormally increased due to line aging and other reasons possibly occurring in long-term operationof the transformer substation can be monitored, fault points are rapidly positioned, and safe operation of a power grid is effectively guaranteed.

Description

technical field [0001] The invention relates to the field of secondary circuits of power system substations, in particular to a precise monitoring device and method for circuit breaker tripping and closing circuits in substations. Background technique [0002] The tripping and closing circuit of the high-voltage circuit breaker is the final protection circuit in the power system control, so the monitoring of the tripping and closing circuit is very important. At present, there are roughly four monitoring methods for circuit breaker tripping and closing circuits at home and abroad: direct monitoring of the simple and intuitive traffic light circuit; indirect monitoring of the central signal starting in series with the normally closed contacts of the tripping and closing position relay; The integrity signal light monitoring of the tripping and closing circuit; the indirect monitoring by connecting a high internal resistance relay in series with the tripping circuit. [0003] ...

AI Technical Summary

Problems solved by technology

[0003] However, the above four methods can only monitor the on-off state of the circuit breaker tripping and closing circuit, and cannot monitor the circuit current in real time.

Therefore, when the cable fault causes the current of the tripping circuit to be abnormal, there is no early warning, and the fault point cannot be located, so that the operation and maintenance personnel cannot be reminded to take remedial measures.

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