A gas relay for transformer

Abstract

The invention relates to the field of transformer safety technology, and discloses a gas relay for transformers, which includes a housing, an open cup, a magnet, a light gas reed contact, a gas plug, a gas release port, a pull rod device, a roller travel switch, wires, One-way air release valve and position sensor, the opening cup is movably installed on the top of the inner cavity of the housing, the magnet is fixedly installed on the right side of the opening cup, the light gas reed contact is movably installed inside the housing and Located at a distance h below the magnet. Through the setting of the pull rod device, the roller type limit switch, the wire and the one-way air release valve, the process of lowering the open cup is further distinguished, that is, the gas can be automatically discharged before the light gas signal is triggered, and the oil level in the gas relay can be restored. , reduce the number of times the operator is on duty, reduce the labor cost, and avoid the frequent triggering of the light gas signal at the same time, increase the operator's accurate judgment of the transformer situation, and improve the operation safety of the transformer.

Description

technical field [0001] The invention relates to the technical field of transformer safety, in particular to a gas relay for a transformer. Background technique [0002] The gas relay is the most important protection device for large power transformers. When a slight fault occurs inside the transformer, if the attached figure 1 , the gas produced by the decomposition of oil gradually accumulates on the upper part of the gas relay, and when it reaches a certain amount, the open cup is lowered by a certain distance h, and the magnet on the open cup is attracted to the light gas reed contact to send out a light gas signal, and then the operating The personnel open the air plug to discharge the gas from the air outlet. When the oil level drops for some reason, the light gas protection can also be activated to send a signal. When a serious fault occurs inside the transformer, the insulating oil is quickly and massively decomposed. The pressure in the fuel tank rises sharply, and ...

AI Technical Summary

Problems solved by technology

[0003] First, there are many different situations in the gas relay to trigger the light gas alarm. For example, the transformer oil decomposes to generate gas, which makes the open cup fall, makes the magnet contact with the light gas reed contact, and triggers the light gas signal. At the same time, the gas relay floats. The falling off of the rotating shaft, oil leakage at the joint, and incomplete air intake or exhaust in the negative pressure area are likely to cause frequent actions of light gas protection. If the operator cannot make timely and correct judgments, it may cause missed judgments for fast-growing faults and cause major accidents. disaster, and these situations are easy to paralyze people. If other faults occur, it is easy to miss a judgment, and it is impossible to accurately handle the faults that occur

[0004] Second, the existing technology judges the operation of the transformer after the action of the light gas signal, which cannot be monitored in real time, and there is a certain hysteresis. huge damage and loss

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