Method for detecting electric arc light and detection device therefor

Abstract

The invention provides a method for detecting electric arc light and a detection device therefor. The detecting method is an optical wavelength switching method which switches ultraviolet light in thereceived electric arc light into visible light which is transmitted by an optical fiber and switched to be an electric signal by a photoelectric converter, and the electric signal can be used for cutting off a signal source of current of an electric power system. Correspondingly, the detection device mainly consists of an optical filter, optical wavelength switching material, a visible light bandpass filter, the optical fiber and the photoelectric converter, wherein the optical fiber is arranged between the optical wavelength switching material and the visible light band pass filter or between the visible light band pass filter and the photoelectric converter; and the optical fiber, the optical wavelength switching material and the visible light band pass filter have split type or combined structure. The invention can be used for accurately judging the occurrence of faulted electric arc light in the electric power system, quickly cuts off the current of the faulted system, and shortens the process duration of the electric arc light, thus reducing the equipment damage as well as loss of life and personal injury caused by the electric arc light to the utmost extent.

Description

technical field [0001] The invention relates to the detection technology of the arc light generated when the equipment in the power system fails, in particular to the detection method and the detection device of the arc light. Background technique [0002] Once a power system fails, it is often accompanied by a huge arc. The huge light energy radiation and temperature energy radiation generated when arc light occurs not only has a great destructive effect on the equipment of the power system, but also causes casualties of operators, so it is extremely harmful. The degree of harm of arc light depends on the duration of arc light, so limiting or cutting off the system current quickly and in time is the key to reducing the loss caused by arc light. For this reason, people in the industry have adopted various methods and corresponding devices to reduce the harm of arc light. For example: the maximum current of the system is limited by the current limiting reactor or the huge p...

AI Technical Summary

Problems solved by technology

Visible light emitted by other interfering lights such as fluorescent lamps, xenon lamps, flash lamps, flashlights and sunlight may also be received by arc light probes. Although some interfering lights contain ultraviolet light components, lightning, xenon lamps, and flash lamps are generally not directly irradiated To the probe, it will only be reflected to the probe by other objects, and the surface of the object has a great absorption effect on ultraviolet light, so the light that can be reflected into the probe is mainly visible light rather than ultraviolet light, so the above-mentioned optical fiber sensor It is not possible to distinguish whether the received light is arc light or interference light

Wei Nianrong of Tsinghua University and others have proposed a method of using fluorescent optical fiber to detect partial discharge signals. This method uses the frequency shift characteristics of fluorescent optical fiber to better match the spectral range entering the photoelectric converter with the wavelength response of the photoelectric converter, which can improve The photoelectric efficiency of the detector can not effectively eliminate the influence of various interfering light

So far, the current arc light detection systems at home and abroad cannot effectively distinguish which light is arc light and which light is interference light, so it may cause misoperation of system protection

The loss caused by the misoperation of the protection system in the large power system equipment is also immeasurable

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