Switch device and control circuit thereof

Abstract

The invention relates to a switch device and a control circuit thereof, which belong to the technical field of GIS substations. According to the control circuit, the second closing switch is additionally arranged in the closing loop, false closing of the knife switch is prevented, and when the knife switch is in an opening state, even if the positive electrode side of the closing relay coil has a direct current grounding fault, the second closing switch is not triggered, and the positive electrode and the negative electrode of the closing relay coil have no potential difference, therefore, false closing of the knife switch is avoided, and safety accidents are avoided. The second opening switch is additionally arranged in the opening loop to prevent the knife switch from being opened by mistake, and when the knife switch is in a closed state, even if the positive electrode side of the opening relay coil has a direct current grounding fault, the second opening switch is not triggered, and the positive electrode and the negative electrode of the opening relay coil have no potential difference, so that the knife switch cannot be opened by mistake; and the occurrence of line interruption is avoided.

Description

technical field [0001] The invention belongs to the technical field of GIS substations, and in particular relates to a switchgear and a control circuit thereof. Background technique [0002] In the high-voltage switchgear of the prior art, the relay module is often used to control the opening and closing of the switch. When the insulation performance of the cable is reduced and the DC grounding is caused, a large potential difference will be generated at the positive and negative ends of the relay in the module. When the potential difference reaches the operating voltage of the relay, the relay will be activated and the closing circuit or opening circuit in the control circuit will be connected, resulting in false opening of the closing knife, which is a huge hidden danger. [0003] Such as figure 1 The control circuit of the switchgear shown includes a closing circuit and an opening circuit, wherein a closing switch G103 and CS-DS (1,2) are arranged in series in the closin...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a control circuit for switchgear, which is used to solve the problem of false closing of the switchgear when the connection cable between the closing switch and the relay module in the existing control circuit is grounded by DC, and then Problems leading to safety accidents, and when the connecting cable between the opening switch and the relay module in the control circuit is DC grounded, the switch blades of the switchgear are caused to open incorrectly, which in turn leads to power failure accidents

A switchgear is also provided, which solves the problem that when a DC grounding fault occurs in the control circuit of the existing switchgear, the switch blades of the switchgear are mistakenly closed or opened, which leads to power failure or safety accidents

Images