Switch cabinet closing lockout circuit

Abstract

The invention discloses a switch cabinet closing lockout circuit. The circuit comprises a handcart working position auxiliary contact normally-closed junction S9, a handcart testing position auxiliarycontact normally-closed junction S8, a closing lockout electromagnet Y1, a closing lockout electromagnet auxiliary contact normally-closed junction S2 and a closing release Y3, wherein the handcart working position auxiliary contact normally-closed junction S9 is connected with the handcart testing position auxiliary contact normally-closed junction S8 in series and then is connected with the closing lockout electromagnet Y1 through a rectifying element V1, the closing lockout electromagnet Y1 controls opening and closing of the closing lockout electromagnet auxiliary contact normally-closedjunction S2, and the closing lockout electromagnet auxiliary contact normally-closed junction S2 is connected with the closing release Y3 in series. A normally-closed junction of a Y1 relay is connected with a closing circuit in series; in the handcart hand-cranking process, the relay is electrified, and the closing circuit is switched off; and when the handcart is at a working position or a testing position, the relay is not electrified, and the circuit is switched on.

Description

Technical field [0001] The invention belongs to the field of circuit design, and specifically relates to a switch cabinet closing and locking circuit. [0002] Background technique: [0003] When the handcart in the current switchgear closing and locking circuit is in the test position or working position, the closing and locking relays in the closing circuit are all energized, and the switch can be opened and closed normally; but the capacitor interval circuit breaker in the system usually takes a long time In the hot standby state, the relay is always in the energized state and is easily damaged. Once damaged, the opening and closing circuit will be disconnected, and the opening and closing circuit cannot be normally opened and closed. In general, 220kV substations are unattended substations with long distances. Once the closing circuit fails, the system safety will be affected. Summary of the invention [0004] The purpose of the present invention is to provide a switching cabin...

AI Technical Summary

Problems solved by technology

[0003] When the handcart is in the test position or working position in the current switch cabinet closing and locking circuit, the closing and locking relays in the closing circuit are all energized, and the switch can be opened and closed normally; If it is in the hot standby state, the relay is always in the energized state and is easy to be damaged. Once damaged, the opening and closing circuit will be disconnected, and the switch cannot be opened and closed normally.

Under normal circumstances, 220kV substations are unattended substations, and the road is far away. Once the closing circuit fails, it will affect the safety of the system.

Images