Switchgear partial discharge detecting system based on ultrasonic signal

Abstract

The invention provides a switchgear partial discharge detecting system based on an ultrasonic signal. The switchgear partial discharge detecting system comprises the components of a power supply module, a sensor module, a signal processing module, an AD conversion module, a single-chip microcomputer module, a communication module and an upper computer. The sensor module comprises an ultrasonic sensor and a preamplifier circuit and is used for acquiring an ultrasonic signal in an air medium. The signal processing module comprises an impedance matching circuit, a main amplifier circuit and an optoelectric coupler. The signal processing module realizes filtering, amplification and detection on the ultrasonic signal. The single-chip microcomputer module performs calculation on data and transmits the calculated data through a serial-port module. An MAX232 chip is utilized in the communication module. Ultrasonic data are finally transmitted to the upper computer by a communication circuit through a serial-port-to-USB line. The upper computer receives the signal which is transmitted from the single-chip microcomputer and performs empirical mode decomposition (EMD), thereby obtaining an intrinsic mode function. Then Hilbert transform is performed. A partial discharge signal is detected through analyzing a Hilbert spectrum.

Description

technical field [0001] The invention belongs to the technical field of electrical detection, and specifically designs a partial discharge detection system of a switch cabinet based on an ultrasonic signal. Background technique [0002] High-voltage switchgear is one of the key components of the power system. With the gradual improvement of power system reliability requirements for power supply, the importance of electrical equipment condition monitoring has become increasingly prominent, and high-voltage switchgear is no exception. There are a large number of insulating support parts inside the high-voltage switchgear. The value of these insulating parts is low. If they are monitored one by one, it will not only greatly increase the complexity and cost of the equipment, but also increase the failure rate of the equipment. [0003] Due to partial discharge of electrical insulation, fault signals such as sound, light, electricity, and magnetism will be generated. In the initia...

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Problems solved by technology

There are a large number of insulating support parts inside the high-voltage switchgear. The value of these insulating parts is low. If they are monitored one by one, it will not only greatly increase the complexity and cost of the equipment, but also increase the failure rate of the equipment.

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