Protection device of closing coil

Abstract

The invention discloses a protection device of a closing coil. The device comprises a normally closed contact of a relay JD1 which is in series with a closing coil HD in a divide-shut circuit of a switch, and partial pressure sampling circuits, inverse circuits and a controlling protection circuit which are in series connection to control the on-off of the normally closed contact point of the relay JD1. wherein one of the two partial pressure sampling circuits is connected with the closing coil HD in the divide-shut circuit of the switch, the other is connected with an opening coil TQ in a closing circuit; the two inverse circuits are respectively connected with the two partial pressure sampling circuits and are used to transfer the output voltage of the closing circuit into the voltage capable of being received by the controlling protection circuit; the controlling protection circuit is used to control the on and off of the relay JD1 according to the collected voltage and preset time of the two partial pressure sampling circuits. The protection device of the closing coil is based on the principle of collecting voltage changes of the before and after patch of switch controlling closing loop and can timely control the disconnection of the circuit of the closing coil when the closing is not successful, thereby reliably avoiding the phenomenon that the closing coil is burned.

Description

technical field [0001] The invention relates to a power system protection device, in particular to a closing coil protection device. Background technique [0002] At present, unattended substations have been popularized, and the opening and closing operations of switches are mostly carried out from remote places or monitoring devices. However, because the switching quality of 35kV and below substations cannot strictly meet the requirements of the harsh operating environment on site, the closing coil often burns out after a period of operation. In the daily defect handling work, the replacement of the closing coil takes up a considerable amount of work. [0003] When the switch needs to change from the open state to the closed state, after the closing signal is sent, due to the existence of the closing holding circuit, the closing coil will always be charged until the switch is successfully closed. In the actual process, there are mainly three kinds of faults that lead to f...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a closing coil protection device to solve the problem that the current closing switch control is unstable and unreliable, and the coil is easily burned due to unsuccessful closing

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