Device and method for detecting three-dimensional space electromagnetic field distribution of hydraulic power plant

Abstract

The invention discloses a device and a method for detecting three-dimensional space electromagnetic field distribution of a hydraulic power plant. The device comprises an electromagnetic field antenna-probe, a conditioning circuit, a microprocessor and a man-machine interface module which are sequentially connected, wherein the electromagnetic field antenna-probe comprises a three-dimensional magnetic field induction antenna and a three-dimensional electric field measuring probe; the conditioning circuit is a dual-channel signal processing circuit which is used for respectively processing signals outputted by the three-dimensional magnetic field induction antenna and signals outputted by the three-dimensional electric field measuring probe, and each channel of the signal processing circuit comprises a forestage isolation circuit and a filtering and amplification circuit; and the microprocessor or the conditioning circuit is integrated with an A / D converter which carries out analog-to-digital conversion on signals outputted by the filtering and amplification circuit. The device and the method for detecting three-dimensional space electromagnetic field distribution of the hydraulic power plant are easy to implement, and can accurately detect three-dimensional space electromagnetic field distribution conditions of the hydraulic power plant.

Description

technical field [0001] The invention relates to a three-dimensional space electromagnetic field distribution detection device and method of a hydroelectric power plant, which is mainly used to measure the electromagnetic field strength and distribution law in a hydropower plant building. Background technique [0002] With the improvement of automation level, the current hydropower plants are basically designed and operated according to the mode of "unattended and few people on duty", and a large number of automatic control devices such as computer monitoring system, governor control unit, excitation adjustment device, vibration swing monitoring system, etc. Commonly installed in the hydropower plant, the control cables and power supply cables connected to the control equipment are usually buried in the building. In addition, the hydropower plant itself has transient transients caused by lightning overvoltage electromagnetic fields and three-phase / two-phase short circuits. El...

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Problems solved by technology

[0002] With the improvement of automation level, the current hydropower plants are basically designed and operated according to the mode of "unattended and few people on duty", and a large number of automatic control devices such as computer monitoring system, governor control unit, excitation adjustment device, vibration swing monitoring system, etc. Commonly installed in the hydropower plant, the control cables and power supply cables connected to the control equipment are usually buried in the building. In addition, the hydropower plant itself has transient transients caused by lightning overvoltage electromagnetic fields and three-phase / two-phase short circuits. Electromagnetic fields, high-frequency electromagnetic radiation generated by corona discharge, power frequency magnetic fields and other factors will occur on the surface of high-voltage transmission lines, so there are complex electromagnetic field interference sources in hydropower plants

Although each power plant takes technical measures such as isolation, improving hardware anti-interference ability, improving software reliability and anti-interference ability in the design stage to reduce the influence of electromagnetic interference in hydropower plants and improve the reliability of equipment operation, engineering practice shows that due to space The electromagnetic field causes the accidental shutdown of the water machine to happen from time to time

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