Insulation test rod and method for measuring protective gap distance of transformer neutral point

Abstract

The invention discloses an insulation test rod and method for measuring the protective gap distance of a transformer neutral point, and the test rod comprises two insulation rods which are equal in length, the insulation rods are telescopic, and the length of each section is fixed; the bottoms of the two insulating rods are fixed together through a bottom fixing device, and the two insulating rods can rotate freely. A rotatable insulating plate is arranged at the top of the insulating rod and is in contact with the protective gap; the lower parts of the insulating rods are provided with scales, the distance between the lower parts of the insulating rods is measured through the scales, and the transformer neutral point protection gap distance can be calculated. The distance of the insulation test rod is adjusted, the upper measuring plate of the insulation test rod is placed in the middle of the gap, the gap distance can be converted by reading the scale, and the purpose of measuring the actual distance of the gap is achieved. According to the invention, live-line measurement of the transformer neutral point protection gap distance is realized, and the distance between live-line equipment of other substations can be measured at the same time. The invention provides an effective method for conveniently and quickly measuring the distance between the live-line equipment of the transformer substation.

Description

technical field [0001] The invention belongs to the field of substation live operation, and in particular relates to an insulation test rod and a method for measuring the distance of a transformer neutral point protection gap. Background technique [0002] For the distance of the neutral point protection gap of substation transformers, the regulations stipulate that the neutral point gap distance of 110 kV transformers is 95mm-150mm, and the neutral point gap distance of 220 kV transformers is 250mm-385mm. Specific adjustments are required. There is no effective measurement method yet, and it can only be measured visually or after a power outage. However, with the requirement of power supply reliability, it is more and more difficult to apply for a transformer power outage, resulting in an uncontrollable state in the distance measurement of the transformer neutral point protection gap. When the protection gap distance is not adjusted properly, once lightning or operating o...

AI Technical Summary

Problems solved by technology

However, with the requirement of power supply reliability, it is more and more difficult to apply for transformer power failure, which makes the distance measurement of transformer neutral point protection gap in an uncontrollable state

When the protection gap distance is not adjusted properly, once lightning or operating overvoltage occurs in the system, the gap may malfunction or not move, and it will not be able to protect the neutral point insulation of the transformer.

There is also no good measure of the distance between other live equipment in substations

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