Chassis/earthing switch control circuit of medium-voltage switch cabinet

Abstract

The invention relates to a chassis / earthing switch control circuit of a medium-voltage switch cabinet. A main processor circuit is connected with one path of monitoring protection circuit, wherein the monitoring protection circuit comprises an A / D conversion circuit and a current sensor; the current sensor is used for collecting a motor current; the current sensor is connected with the main processor circuit through the A / D conversion circuit; the other path of monitoring protection circuit is also arranged and comprises a logic processing circuit, an isolating circuit and a corresponding detection circuit; the detection circuit is connected with a drive circuit and is used for forming corresponding logic signals according to output of the drive circuit and feeding these logic signals into the logic processing circuit through the isolating circuit; the logic processing circuit carries out judgment according to the input logic signals; and the judgment result is also used for generating a trigger control signal. According to the control circuit provided by the invention, the monitoring protection circuit is divided into two paths; and the motor condition is comprehensively analyzed, so that the reliability is greatly improved.

Description

technical field [0001] The invention relates to a chassis car / grounding knife control circuit of a medium-voltage switch cabinet. Background technique [0002] With the continuous improvement of the intelligence of medium-voltage switchgear, the control of the chassis / grounding knife in the switchgear has gradually changed from manual control to electric control, and various chassis / grounding knife control modules have been derived. [0003] For example, the Chinese patent application of CN204906000U discloses an electric grounding knife control device for an electric chassis vehicle, including a switch drive circuit, a PWM control module, a motor forward and reverse control module, etc., and also includes a sampling module for sampling information and feeding back to total control module. [0004] The above method has the following problems: 1. This solution completely relies on the sampling module, has low reliability, can perform control and simple protection functions, ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a medium-voltage switchgear chassis car / grounding knife control circuit to solve the problem of poor reliability and stability of the control circuit in the prior art; and further solve the problem of slow processing speed and space occupation And the four IGBT switching control motors are easy to cause problems such as short circuit of the power supply

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