Modular operation loop

Abstract

The invention relates to the technical field of power system protection devices, in particular to a modular operation loop which comprises a tripping loop and a closing loop. The tripping loop comprises a tripping trigger module and a tripping power electronic module which are connected in series, the tripping power electronic module is connected with a tripping coil of an external switch, and thetripping trigger module is connected with the tripping coil of the external switch. The closing loop comprises a closing trigger module and a closing power electronic module which are connected in series, the closing power electronic module is connected with a closing coil of an external switch, and the tripping loop and the closing loop are respectively connected to the positive electrode and the negative electrode of an operating power supply. The action time of the switch tripping and closing coil of the modular operation loop is at the nanosecond level, high voltage resistance and large current resistance are achieved, and the integrated installation size is greatly reduced compared with that of a conventional operation loop.

Description

technical field [0001] The invention relates to the technical field of power system protection devices, in particular to a modular operation circuit. Background technique [0002] In order to ensure the reliability of the protection action, the power system protection device is equipped with an operation circuit. The operation circuit mainly has three functions: a) Increase the contact capacity. If the contact of the protection element directly turns on and off the circuit of the switch, it is easy to cause The outlet contact is burnt, so it is reset by the large-capacity intermediate relay of the operation circuit; b) Increase the number of contacts, such as the number of contacts such as TWJ and HWJ that the switch body can provide. Logical functions such as indication, control circuit monitoring, non-corresponding start reclosing; c) function of preventing switch jumping. [0003] The conventional operation circuit is a relay operation circuit, which is composed of a tri...

AI Technical Summary

Problems solved by technology

After the protection CPU of the relay-type operation circuit issues a trip command, it takes 8ms to start the trip relay, and the action time of the trip relay TBJ and the closing relay HBJ takes 10ms. The protection action time is long and the sensitivity is low; the current required for the normal operation of the relay contacts is small. , and the large current generated when the switch trips will burn the relay contacts; the conventional relay type operation circuit adopts the electromagnetic principle, the coil volume is large, and the circuit area is large

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