Laser resonance Raman method for extra-high-voltage corona discharge early diagnosis

Abstract

The invention discloses a laser resonance Raman method for extra-high-voltage corona discharge early diagnosis. A diagnosis system adopted in the method is composed of a remote laser resonance Raman testing system (1) and a rotary lifting adjusting support (19). The remote laser resonance Raman testing system is composed of a main control analysis subsystem (10), a visible light imaging system (9), an ultraviolet source subsystem (12), a cassette telescope (21), an ultraviolet spectrograph (4) and an optical accessory. Corona discharge early diagnosis can be achieved by carrying out laser resonance Raman spectrum detection on extremely tiny amounts of ozone, nitrogen oxide and nitric oxide gas molecules produced in the early-stage corona discharge chemical effect. According to the laser resonance Raman method for extra-high-voltage corona discharge early diagnosis, remote visible spectrum detection operation is achieved through the visible light imaging and laser resonance Raman spectrum detection optical path sharing and automatic focusing technology, ozone molecule molecular resonance Raman spectrum detection with extremely high sensitivity is achieved, and nitric oxide and nitrogen dioxide Raman spectra are effectively detected.

Description

[0001] technical field [0002] The invention relates to a laser resonance Raman method for early diagnosis of extra-high voltage corona discharge, which adopts the laser resonance Raman technology and belongs to the technical field of photoelectric testing. Background technique [0003] UHV transmission refers to 1000kV AC voltage and plus or minus 800kV DC voltage transmission engineering and technology. With the gradual completion of the UHV power grid, the security of its operation is very important. In UHV power grid accidents, the frequency of insulation accidents is relatively high, especially under the action of UHV strong electric field, the corona discharge of electrical equipment is a relatively easy accident. Corona discharge is a kind of discharge after gas ionization Form, is a powerful source of electromagnetic interference. Corona discharge can cause power loss, interfere with communication, and shorten the service life of transmission lines. [0004] ...

AI Technical Summary

Problems solved by technology

But for the early corona discharge, its intensity is extremely weak, and the intensity of the radiated ultraviolet rays is very small. For the remote detection ultraviolet imager, it is difficult to judge the corona discharge ultraviolet radiation from the background interference through the difference in the gray level of the ultraviolet image.

Ultrasonic detectors diagnose corona discharge by detecting the ultrasonic part of the corona discharge that generates noise, but remote ultrasonic detection is easily affected by environmental noise. In addition, the early corona discharge intensity is extremely weak, resulting in the noise intensity in the ultrasonic frequency band Very weak, hard to detect

[0006] Publication No. CN102331540 discloses an on-line corona discharge monitoring device and method for UHV transmission lines. It analyzes and judges the ultraviolet light emitted by monitoring the discharge after corona discharge. monitoring, but it cannot detect early corona discharge

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