Laser detection display for judging actual position of power knife switch

Abstract

The invention relates to a laser detection display for judging the actual position of a power knife switch, which comprises a laser transmitting circuit and a photosensitive receiving circuit, wherein the laser transmitting circuit mainly comprises a 2-hertz frequency oscillator and a plurality of laser tubes; the quantity of photosensitive tubes is identical to that of the laser tubes in the laser transmitting circuit, and each photosensitive tube is connected into a DC power supply loop after being serially connected with a light-emitting tube and a resistor in sequence; and the laser tubesand the photosensitive tubes are equidistantly arranged on the left side and the right side of the movement track of an moving contact insulating porcelain bottle of the power knife switch respectively, and the distance between two adjacent laser tubes and that between two adjacent photosensitive tubes are not greater than the diameter of the moving contact insulating porcelain bottle of the power knife switch. By using the laser detection display provided by the invention, the actual position of the operated knife switch can be effectively judged and displayed, the misoperation accidents of closing energized switch to grounded part or closing grounding switch to energized live part are avoided, and the safety of power equipment running is improved.

Description

technical field [0001] The invention relates to a detection device for closing position of a power switch, in particular to a laser detection display for the actual closing position of a knife switch in a high-voltage switch cabinet. Background technique [0002] High-voltage cabinets are important equipment for power transmission, and safety is the primary issue. Despite repeated orders and repeated warnings, misoperations still occur from time to time. In Tianjin and Meishan, Sichuan in recent years, the closing of the gate with ground knife and the closing of ground knife with electricity are extremely serious vicious accidents. [0003] Investigate the cause - mechanical failure, the opening is not in place, but it is still wrongly indicated, and it is caused by wrong operations such as live closing knife. [0004] Taking the Zhenjiang substation accident in Meishan, Sichuan as an example, we will introduce the specific situation. [0005] A brief description of the ac...

AI Technical Summary

Problems solved by technology

[0007] 1. The drive shaft of the 9611 knife switch of the 10KV capacitor switch cabinet was bent and deformed. The opening of the 9611 knife switch was not in place, and the operation interlock mechanism could not normally lock the grounding knife switch, resulting in the electrified closing of the 96110# grounding knife switch, which was the direct cause of the accident. reason

[0008] 2. The operating personnel on duty violated the switching operation regulations, did not carefully check the actual position of the 9611 knife switch after operation, and only judged the position of the knife switch based on the opening and closing instructions, which was the main cause of the accident

[0009] 3. The 961 switchgear was put into operation in 2007, and there are potential safety hazards such as unreasonable setting of live display devices

For example, Neijiang Electric Power Bureau had two cases where the closing was not in place this year. After testing and analysis, it was also due to the loose arm and lack of strength that the metal head was not pushed into the slot of the static contact. In this way, the contact resistance increased. Large, the temperature rises sharply, and at the same time, it causes three-phase unbalanced and other fault phenomena.

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