A smart substation three-position isolating switch and its control circuit

Abstract

The invention belongs to the technical field of power distribution equipment, and particularly relates to an intelligent substation three-position isolation switch and a control loop thereof. The control loop comprises a main loop which is used for driving motor operation and a control loop which is used for judging whether an intelligent controller operates on a protection, control and measurement integrated device. The main loop comprises a branch circuit which realizes forward rotation of the motor with the intelligent control as the control body with combination of the relay, a branch circuit which realizes reverse rotation of the motor with the intelligent control as the control body with combination of the relay, a loop which realizes blocking of the motor with the intelligent control as the control body with combination of the relay, a branch circuit in which the relay assists the contact to control the motor to perform forward rotation and a branch circuit in which the relay assists the contact to control the motor to perform reverse rotation. The control loop comprises a control branch in which the protection, control and measurement integrated device remotely controls the intelligent controller to output a forward rotation knife closing signal, a control branch which outputs a forward rotation grounding knife separating signal, a control branch which outputs a reverse rotation knife separating signal and a control branch which outputs a reverse grounding knife closing signal.

Description

technical field [0001] The invention belongs to the technical field of power distribution equipment, and in particular relates to a three-position isolation switch of an intelligent substation and a control circuit thereof. Background technique [0002] The State Grid Corporation proposed to build a new generation of intelligent substations with the application of "integrated equipment + integrated business platform + standard distribution construction mode" as the main feature, with small footprint, low cost, high efficiency, and integrated support and regulation. Among them, the use of new compact and integrated primary equipment is the new key point, which is piloted in the 110kV substation. In this new generation of 110kV intelligent substation, the 35kV inflatable switch cabinet is used, and the isolating switch adopts the three-position isolating switch type, which will isolate the The three functions of , closing and grounding are integrated into an integrated micro-d...

AI Technical Summary

Problems solved by technology

The control circuit of the three-position isolating switch, its travel switches S1'-S4', the control switch SB1 and SB2, and the coils and contacts of the contactors KM1-KM4 constitute a control circuit for controlling the action of the moving contact, and its relay auxiliary contact Too many serial connections and parallel connections lead to complex and cumbersome circuits, which can easily lead to secondary circuit hazards, and the control circuits are not clear, and it takes time for operation and maintenance personnel to identify them one by one, and the three-station isolation control in this patent The switch is mainly a conventional method, and the degree of intelligence and integration is not high. In addition, it does not include the background to the control circuit of the measurement and control device and then the operation of the three-position isolating switch.

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