Circuit breaker test method and system based on vibration signal analysis

Abstract

The invention discloses a circuit breaker test method based on vibration signal analysis, relates to the technical field of circuit breaker automatic test systems, and solves the technical problem that the dissimilarity between a vibration amplitude time curve and a reference curve is difficult to determine. The method comprises the following steps: calculating and analyzing frequency spectrum characteristic vectors of a real-time vibration amplitude time curve and a reference vibration amplitude time curve to obtain a plurality of analysis indexes; and comparing the analysis indexes with setindexes to determine the dissimilarity degree between the effective vibration amplitude time curve and the reference vibration amplitude time curve. The invention further discloses a circuit breaker test system based on vibration signal analysis. The difference of the vibration amplitude time curve at different time points can be automatically found through comparison, and the vibration amplitudetime signal can be filtered. The noise of the vibration amplitude time signal is smaller and is closer to a real vibration condition.

Description

technical field [0001] The present invention relates to the technical field of circuit breaker automatic test system, more specifically, it relates to a circuit breaker test method and system based on vibration signal analysis. Background technique [0002] Circuit breakers are one of the most important protection devices in power systems. When the system fails, it is used to disconnect the fault circuit and protect the subsequent circuit and equipment. Therefore, the safe and reliable operation of circuit breakers is very important to the safety and stability of the power grid. The testing and detection of circuit breakers is one of the main items of power equipment maintenance and testing. At this stage, the test method and evaluation method for circuit breakers are mainly mechanical characteristic tests. That is, by measuring the operating time, operating speed, stroke curve and coil current curve of the circuit breaker to judge whether the mechanical condition of the ...

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Problems solved by technology

[0003] (1) In some working environments, the circuit breaker will be packaged in a confined space, and the mechanical characteristic test cannot be performed directly. At this time, the traditional mechanical characteristic test method cannot be used to evaluate the circuit breaker;

[0004] (2) It is impossible to accurately locate the fault location of the circuit breaker through conventional test methods such as action time, action speed, and stroke curve;

[0005] (3) The stroke and speed sensor installation of the conventional test method is relatively complicated, and the installation positions of the circuit breaker stroke and speed sensor of different manufacturers are different, and the professional requirements for the test personnel are relatively high

However, the current test methods and equipment do not propose an effective method for sampling and automatic comparison of vibration curves

The time curve of vibration amplitude is relatively complex, and it is extremely difficult and unscientific to judge the similarity of the curve manually only in the time domain, and it cannot accurately reflect the real situation of the circuit breaker. Large and highly susceptible to interference

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