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Transformer leakage is divided into oil side leakage and gas side leakage.

1. Oil side leakage is commonly referred to as “leakage oil”. It mainly occurs in the joint surface of the transformer, welds, sand holes, butterfly valves, heat sinks, porcelain bottles, bushings, bolts and other parts. In fact, for oil leakage on the oil side, when the oil pressure at the oil leakage point is less than or equal to the osmotic pressure of the oil solution (contaminated oil), the mutual penetration between molecules occurs, and the moisture and gas in the atmosphere will also invade the interior of the fuel tank. It is also an interpenetrating process.

2. Gas side leakage means that the gas part in the transformer is connected to the atmosphere. For example, there are gas parts at the upper end of the cable duct of the transformer bushing, the upper part of the oil chamber of the oil conservator, the upper part of the oil-carrying transformer, and the upper part of the bushing oil conservator. Oil. The characteristic of gas-side leakage is that due to the thermal expansion and contraction of the gas, breathing is formed at the oil seepage. Inhaling moisture and gases from the atmosphere, especially in rainy and foggy weather, may absorb a large amount of moisture at one time. The inhaled moisture will seriously damp the local insulation, which is enough to cause insulation accidents under normal operating voltage. Gas-side leakage does not leave traces like oil leakage, and it is not easy to be detected, so it is easy to cause accidents; and once an accident occurs, it is a transformer or bushing burning accident, which is particularly harmful.

For more information about transformer, you can check this article: The danger of transformer oil leakage