17/5000 Wiring principle and application of high voltage circuit breaker anti-trip circuit

Circuit breaker is the main primary equipment in power system. Now there are many domestic manufacturers, and its arc extinguishing principle, operating organization and control loop are also diverse, with their own characteristics, especially the planning of anti-jump loop is very different. How to combine the control loop and the anti-jump loop well is the most concerned question of engineering skills personnel. Based on years of field experience and application practice, this article analyzes the current popular anti-jump loop wiring and principles as follows:

1. The role of anti-jump loop

a1 Avoid the failure of the closing contact of the control switch or automatic equipment to return in time (such as the operator does not release the handle, the closing contact of the automatic equipment is glued) and just close on the faulty line and equipment, forming a circuit breaker connection and cutting scene.

b1 There is another main function of the electrical anti-jump circuit of the current starting and voltage sticking type, that is, to avoid the improper adjustment of the auxiliary contact of the circuit breaker of the trip circuit (too slow), forming the scene of the maintenance outlet contact breaking arc first and burning. This scene is not tolerable for microcomputer maintenance equipment, and this is often ignored by everyone.

2. Typical cables for the anti-jump loop

Common anti-jump loop has series anti-jump loop, parallel anti-jump loop, spring energy storage anti-jump loop, tripping coil auxiliary contact type anti-jump loop, etc. Domestic circuit breakers use series anti-jump circuit breakers use parallel anti-jump circuit breakers. Among them, the series anti-jump loop is the most reasonable and the most widely used, in addition to its anti-jump function, it also has the advantage of avoiding the maintenance of the exit contact breaking arc and burning, which is also the use of microcomputer maintenance equipment is not a lack of skill conditions.