Basic working principle of gas protection for hydraulic transformer

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The protection of gas quantity and velocity is called gas protection when fault occurs. The internal fault of the transformer shows that the local high temperature of the fault point causes the transformer oil temperature to rise, the volume expansion, and the air inside the oil is discharged to form an ascending gas. When arcing occurs at the fault point, a large amount of gas will be separated from the transformer oil and insulating material and flow from the tank to the oil conservator.

The more serious the fault is, the more gas will produce, and the faster the oil flow will flow to the oil conservator. Because the gas quantity and oil flow velocity can directly reflect the nature and severity of transformer fault, the light gas acts on the signal when a small amount of gas is produced and the air flow velocity is small; the fault is serious, and the heavy gas protection instantaneous action on the trip when the oil flow rate is high.

Gas relay is the main component of gas protection. It is installed in the middle of the connecting tube between the tank and the conservator, so that the gas inside the tank must pass through the gas relay to flow into the oil conservator. In order to make the gas flow smoothly to the oil tank, the old transformer requires the tank and the coupling to have a certain degree of inclination, in which the tank requires 1%-1.5%, the pipe required 2%-4% tilt.

The new transformer is equipped with gas collecting in the place where the gas is easy to gather (such as the bushing rising seat), and all the gas collecting units are connected to the gas collecting main pipe, and then the gas collecting main pipe is connected to the connecting pipe of the front end of the gas relay. In this way, as long as the gas collector and the tube have a certain inclination, gas can flow into the oil conservator, so the tank has no inclination requirements.