N2 Gas Sealed Transformers
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Description
In the early period of sealed tank transformer for incoming moisture and air protection transformer development, to seal the transformer, the transformer tank is higher than normal and oil are filled to cover the active parts. The space above the active parts is filled with "Dry air" or "Inert Gas" such as Nitrogen Gas to help the expansion of the oil. This is why we called this type of transformers, "N2 Gas Sealed Transformers". When the temperature of the oil is increased, the volume is also increased. The space above the oil will be decreased and consequently, the pressure of the tank will be increased. For N2 gas sealed type, the advantage points of this type of transformers are, sealed , easy to manufacture without any high technology. The tank is a "Fix Tank", meaning, it will not expand or contract as the changing of pressure. The disadvantage points are, the tank will take high pressure, the life of gaskets around the cover and the bushings will be short, since there is no cooling from the oil. This type of transformers can be designed in such a way to reduce the pressure of the tank. They must be of low losses transformers or low temperature rise transformers. These transformers will be more expensive, and larger size. To overcome the short life of the gaskets, the bushings can be placed on the side of the tank, and the cover can be welded. But the maintenance of such transformers are very difficult. This case will be done only when customers are insisted. Pressure Gauge is often placed on the N2 Gas Sealed Transformer, for the operator to record and notice the pressure of the transformer. If leakage happens, maintenance can be done in time.
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N2 Gas Sealed Transformers
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