Totally-enclosed controllable transformer neutral point protection discharge gap

Abstract

The invention provides a totally-enclosed controllable transformer neutral point protection discharge gap, and the gap comprises a shell; the shell is filled with insulating gas, and a first wall bushing and a second wall bushing are respectively arranged at two ends of the shell in a penetrating manner; the first discharge gap piece and the second discharge gap piece are respectively fixed at theend parts of the extending ends of the first wall bushing and the second wall bushing, and a discharge gap is formed between the first discharge gap piece and the second discharge gap piece; the plasma jet generation device is arranged at an air outlet of the fan and is used for generating plasma jet. According to the invention, the plasma jet flow is formed between the discharge gaps, the transformer is subjected to overvoltage, and when high voltage occurs at the two ends of the discharge gaps, the discharge gaps are immediately conducted; the two discharge gap pieces are arranged in the sealed shell structure, breakdown of the discharge gap is not affected by external environmental factors, dispersity of breakdown voltage of the discharge gap is eliminated, and misoperation of the discharge gap under overvoltage and damage to a transformer are avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a fully enclosed controllable transformer neutral point protection discharge gap. Background technique [0002] In 110kV and 220kV voltage level power grids, in order to limit the zero-sequence impedance of the transformer system, the neutral point of some transformers is directly grounded, and the neutral point of some transformers is not grounded; because 110kV and 220kV kV transformers usually adopt graded insulation , when the neutral point is not grounded, in order to protect the neutral point insulation, the neutral point of the transformer is usually connected to the ground in parallel through the protective gap and the arrester; the principle of cooperation between the two is: the arrester bears the lightning overvoltage and the operating overvoltage under normal operating conditions Protection; due to grounding faults forming a local unground...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a fully enclosed controllable transformer neutral point protection discharge gap to solve the problem that the insulating medium of the existing gap structure is air, and the breakdown voltage is greatly affected by the environment , the dispersion is large, and it is easy to cause technical problems such as protection device malfunction or transformer damage

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