Method for calculating switching-off and switching-on time of breaker and stroke of moving contact of breaker

Abstract

The invention discloses a method for calculating the switching-off and switching-on time of a breaker and the stroke of a moving contact of the breaker. According to the method, first, a switching-on operating coil starts to be powered on after the breaker receives a switching-on instruction, the coil generates sufficient electromagnetic force to push an iron core to move along with increasing of current so that an energy storage mechanism can be started to release energy to generate acting force for driving the moving contact to move, then, the moving contact can make contact with a fixed contact and arrive at a position where switching-off is just achieved at the moment, and the stoke of the moving contact is called as idle stroke before; second, the moving contact continues moving on to arrive at the switching-on position and keeps a switching-on state with a mechanism, and the process is called as over-stroke; the stroke distance of the moving contact is the sum of the idle stroke distance and the over-stroke distance; in the switching-off process, the first step and the second step are repeated in the same way. The method is simple in algorithm, easy to realize in an embedded system, capable of lowering cost effectively and beneficial to miniaturization of the system. The moment when the moving contact of the breaker starts to move and the moment when the moving contact of the breaker stops moving can be accurately acquired.

Description

technical field [0001] The invention relates to a method for calculating the opening and closing time of a circuit breaker and the stroke of a moving contact. Background technique [0002] As an important switchgear in the power system, the circuit breaker is responsible for the dual tasks of control and protection. Its performance is one of the important factors that determine whether the power system can provide safe and reliable power supply. The operating mechanism is an important part of the circuit breaker, and its reliability and durability will directly affect the evaluation of the performance and quality of the circuit breaker. The reliability analysis of circuit breakers released by the Reliability Management Center of China Electricity Council pointed out that in the past 10 years, the main faulty component that caused the unplanned outage of circuit breakers in my country is the operating mechanism, and the failure of the operating mechanism accounts for all the ...

AI Technical Summary

Problems solved by technology

[0003] At present, the real-time detection of moving contacts of circuit breakers mainly includes methods based on wavelet singularity detection and radial basis function network theory. These methods have high requirements on hardware resources and cannot be miniaturized and low-cost.

At present, the real-time detection of moving contacts of circuit breakers mainly includes methods based on wavelet singularity detection and radial basis function network theory. These methods have high requirements on hardware resources and cannot be miniaturized and low-cost. It is also inconvenient; in summary, the existing methods for implementing state diagnosis or real-time online monitoring and storage of circuit breakers obviously have inconvenience and defects, so it is necessary to improve

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