Optimizing method for closing circuit of 10kv circuit breaker

Abstract

The invention discloses a method for optimizing the closing circuit of a 10kV line circuit breaker. The invention adjusts the contact pressure of a relay, crimps and deforms the contacted points, increases the contact area of ​​these points, and at the same time makes more points Contact, so that the contact resistance is reduced, so that when the same current flows, the heat of the contact will be greatly reduced, and the current allowed to pass through the contact will be greatly increased, and a new one is installed in the original automatic tripping circuit. The intermediate relay with large contact moving and closing capacity makes the moving and closing contacts of the time-delayed disconnection replace the moving and closing contacts of the time relay to connect to the automatic tripping circuit. In this way, when the contact is not open, under the action of the delay moving contact, the tripping circuit is not disconnected preferentially to ensure that the current of the tripping circuit is cut off, thereby protecting the moving contact from singeing and sticking, and avoiding the occurrence of line accidents .

Description

technical field [0001] The invention belongs to the technical field of high-voltage line detection and maintenance, and in particular relates to an optimization method for a closing circuit of a 10kV line circuit breaker. Background technique [0002] On the 10kV power line, vacuum switches are installed on the line poles in different locations. Its purpose is to pull and close with load to facilitate maintenance; to provide short-circuit protection for a certain section of line; to improve line inspection efficiency and reduce labor intensity. However, at present, the actual operation effect of this line vacuum switch is not ideal. The main reason is that the contacts of the time relay have poor contact and the resistance is too large. If the current is large and the power-on time is long, the temperature may rise to the softening point of the material, causing permanent deformation, causing the singeing of the contacts to stick, and the tripping circuit is always charged,...

AI Technical Summary

Problems solved by technology

However, at present, the actual operation effect of this line vacuum switch is not ideal. The main reason is that the contacts of the time relay have poor contact and the resistance is too large.

If the current is large and the power-on time is long, the temperature may rise to the softening point of the material, causing permanent deformation, causing the singeing of the contacts to stick, and the tripping circuit is always charged, causing the circuit breaker to fail to close when there is no fault. brake

Therefore, such problems have seriously affected the normal and stable operation of 10kV lines

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