Breaker operating mechanism state diagnosis method based on grey relational analysis

Abstract

The invention discloses a breaker operating mechanism state diagnosis method based on grey relational analysis, comprising steps of stimulating a normal operation state and various typical abnormal states according to the breaker operation mechanisms which are identical in modes and manufactured by the same plant, performing breaking and closing operation in every minute, obtaining the closing coil current and the voltage waveform of each time, and the breaking coil current and the voltage waveform of each time, respectively extracting diagnosis characteristic quantity and establishing an operation mechanism state diagnosis model, performing breaking and closing operation on the diagnosis breaker operation mechanism and obtaining the closing coil current, the voltage waveform and the breaking coil current and the voltage waveform, and extracting the diagnosis characteristic quantity input operation mechanism state diagnosis model to obtain the state diagnosis result of the diagnosis breaker operation mechanism. The invention fully considers the working voltage interference of the breaking closing coil, adopts the grey relational analysis diagnosis method applicable to the small sample data, and has advantages of comprehensive in information, small in redundancy, fast in diagnosis, high in accuracy, high in reliability, low in cost and strong in universality.

Description

technical field [0001] The invention relates to a state diagnosis technology of electrical equipment, in particular to a method for diagnosing the state of a circuit breaker operating mechanism based on gray relational degree analysis. Background technique [0002] Circuit breakers are key equipment to ensure the safe and stable operation of the power grid, and their reliability is directly related to the reliability of power supply. From 1971 to 1991, the 13.06 working group of the International Large Power Grid Conference conducted two worldwide surveys on high-voltage circuit breakers. In the first major survey, the faults of the operating mechanism, electrical control and auxiliary circuits accounted for the total faults respectively. 33% and 19% of the total failure rate in the second major survey respectively accounted for 43% and 21% of the total failure rate. The reliability of the circuit breaker depends to a large extent on the reliability of the operating mechani...

AI Technical Summary

Problems solved by technology

However, the existing circuit breaker operating mechanism state / fault diagnosis method / system based on the opening and closing coil current does not consider the influence of the DC power supply voltage. Most of them use expert systems, neural networks, support vector machines, etc. for diagnosis, and the algorithms are complex. Limited by the difficulty of sample collection, the generalization ability needs to be further tested

During the state / fault diagnosis, the common causes affecting the current waveforms of the opening and closing coils were not analyzed, and the position of the state / fault definition was not accurate enough; Problems such as closing time and phase-to-phase synchronization exceeding the standard have not been excavated

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