Photoelectric sensor for discharge detection and discharge detection alarm method

Abstract

A photoelectric sensor for discharge detection disclosed by the present invention comprises a sensor housing, a window, a secondary window sheet, an ultraviolet photosensitive element and a signal processing circuit, the ultraviolet photosensitive element and the signal processing circuit are arranged in the sensor housing, and the sensor housing is provided with the window. The window is provided with a secondary window sheet used for closing the window and introducing an ultraviolet light signal. The ultraviolet photosensitive element comprises an element shell, a sensing unit and a primary window sheet, the sensing unit is located in the element shell, the primary window sheet is located right above the sensing unit, the secondary window sheet is located right above the sensing unit and the primary window sheet, and the ultraviolet photosensitive element is connected with the signal processing circuit; the secondary window sheet can penetrate ultraviolet light with the wavelength of 280 nm or below, the secondary window sheet is hard plate glass or one of a hard convex lens, a Fresnel lens and an aspherical lens, surface cleaning can be conducted in the using process of the secondary window sheet, the core photosensitive element is not damaged, the service life is long, and the using cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a photoelectric sensor for discharge detection and a discharge detection and alarm method. Background technique [0002] In the power field, 10kV, 35kV and other medium-voltage switchgears, ring main unit, box-type transformer (installed in the cabinet) and dry-type transformer (installed in the cabinet) are currently commonly used high-voltage equipment. These high-voltage equipment often discharge due to problems such as high humidity or condensation in the cabinet, and the discharge will cause a short circuit to the ground, and even cause a combustion explosion in severe cases. In order to ensure the safe use of these high-voltage equipment, it is necessary to detect the discharge phenomenon of these high-voltage equipment. [0003] During the discharge process, ultraviolet light with a waveband of 80-280nm is usually generated, and the ultraviolet light in th...

AI Technical Summary

Problems solved by technology

The primary window is a layer of glass medium close to the sensitive unit of the core detector. It is packaged together with the photosensitive element as a whole. Once a problem occurs, the photosensitive element and the primary window need to be replaced as a whole, and the replacement cost is high.

In addition, the high-voltage equipment will continue to run for several years before being repaired. After a long period of continuous operation, the probability of dust accumulation and condensation on the surface of the component is very high. Since the ultraviolet photosensitive component is a relatively fragile, sensitive and expensive optical component, when After its surface is heavily polluted, it will affect the detection sensitivity

If you use wiping or other methods to clean the dirt on the surface during maintenance, it is very easy to scratch or even damage the precious photosensitive element. If you directly replace the photosensitive element, the cost is very high

In addition, the existing discharge ultraviolet detection technology does not clearly stipulate the alarm standard, which brings troubles to the operation and maintenance personnel of high-voltage equipment

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