On-line monitoring system for high-voltage breaker based on vibration characteristics

Abstract

The invention discloses an on-line monitoring system for a high-voltage breaker based on vibration characteristics. The on-line monitoring system comprises a vibration sensor arranged on a mechanical shell of a breaker, a signal processing circuit, a wireless data receiving and sending module, a vibration measuring plate and a lower computer, wherein the vibration sensor is used for collecting mechanical vibration response signals of a breaker switch; after the mechanical vibration response signals are subjected to signal pre-treatment by the signal processing circuit, short-range wireless receiving and sending can be performed by the wireless data receiving and sending module; the vibration measuring plate is used for collecting the wirelessly transmitted vibration signals and sending the signals to the lower computer; and the vibration signals are sequentially compared with a characteristic waveform 'fingerprint' at a moveably switching moment of the normal breaker stored in the lower computer, so as to judge whether the breaker is in mechanical fault. The on-line monitoring system has the advantages that the method is simple, the mounting and maintenance are convenient, and the sensor need not be placed in the breaker, and the like, so that the danger of mounting personnel is greatly reduced.

Description

technical field [0001] The invention relates to the application fields of power equipment, signal processing, sensor network and the like, in particular to an on-line monitoring system of a high-voltage circuit breaker based on vibration characteristics. Background technique [0002] The high-voltage circuit breaker can not only cut off or close the no-load current and load current in the high-voltage circuit, but also cut off the overload current and short-circuit current through the function of the relay protection device when the system fails. It has a fairly complete arc-extinguishing structure and Sufficient breaking capacity can be divided into: oil circuit breaker (more oil circuit breaker, less oil circuit breaker), sulfur hexafluoride circuit breaker (SF6 circuit breaker), vacuum circuit breaker, compressed air circuit breaker, etc. According to national standards, high-voltage circuit breakers refer to circuit breakers with a working voltage higher than 6KV. [00...

AI Technical Summary

Problems solved by technology

[0004] The traditional on-line monitoring method of high-voltage circuit breaker mainly monitors the number of mechanical operations of the circuit breaker, the cumulative running time of the switch, the contact switching time of closing and opening coil loops, the current and voltage of closing and opening coils, the stroke of the moving contact of the circuit breaker, the circuit breaker Contact speed, closing spring status, etc. This method is simple to monitor and easy to standardize, but there are some problems and deficiencies, mainly in the serious electromagnetic interference, the sensor must be connected to the inside of the circuit breaker, poor safety, and unstable performance , Inconvenient disassembly, poor anti-interference ability, and low accuracy of measured data

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