Vibration Sensors for Mechanical Fault Monitoring of High Voltage Circuit Breakers

Abstract

The invention discloses a vibration sensor used for monitoring a mechanical fault of a high-voltage circuit breaker, which comprises a vibration sensitive element, a charge amplifier, a sensor shell, a lead and a lead joint, and is characterized in that the sensor is installed at a monitored part of the high-voltage circuit breaker, the vibration sensitive element picks up operating state signals of the high-voltage circuit breaker and differentially outputs the operating state signals to differential input of the charge amplifier, a working power supply and differential output signals of the charge amplifier are connected to a shielded twisted pair through the lead joint and transmitted to a monitoring device, and the vibration sensitive element and the charge amplifier are installed inside a sealed metal cavity formed by the sensor shell and the lead joint. The vibration sensor disclosed by the invention has the beneficial effects that strong electromagnetic interference of an operating condition environment of high-voltage circuit breaker state monitoring can be effective suppressed, and a result of high-voltage circuit breaker operating state monitoring is enabled to be more accurate and more reliable.

Description

technical field [0001] The invention belongs to a vibration monitoring sensor, in particular to a vibration sensor used for mechanical failure monitoring of a high-voltage circuit breaker. Background technique [0002] The high-voltage circuit breaker plays an important role in control and protection in the power system. Its function is equivalent to a switch, which closes the normal circuit and puts it into the grid operation. harm. With the increase of its running time and some environmental factors, high-voltage circuit breakers are accompanied by various failures, among which mechanical failures are the most common and most frequent; in the monitoring of mechanical failures, vibration monitoring is a non-invasive monitoring way, it is easy to implement. The vibration signal of a high-voltage circuit breaker is a superimposed shock wave generated by a series of actions of its internal transmission mechanism, and the vibration signal contains a large amount of rich equip...

AI Technical Summary

Problems solved by technology

[0004] Most of the vibration sensors used in the mechanical fault monitoring of the existing high-voltage circuit breakers come from the vibration monitoring of rotating machinery, and these sensors generally use single-ended output signals, which are difficult to meet the operating conditions of high-voltage circuit breakers. Often due to complex electromagnetic Misdiagnosis and missed diagnosis due to interference, and in severe cases, damage to monitoring devices or sensors

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