More details https://globecore.com. We present to your attention power transformer drying technology by hot oil spraying and equipment.

GlobeCore professionals have developed a hot oil spraying technology, which is implemented by means of CMMRM hot oil sprayer with a throughput of 30 m3/h.

Transformer drying with the use of CMMRM hot oil sprayer begins with almost complete draining of oil from the transformer tank. GlobeCore recommends that not more than 10% of the initial volume be allowed to remain in the tank. Next, the hot oil sprayer is installed above the transformer’s active part in combination with a manifold. The manifold consists of attachment flanges and pipes joined by welding and is used to attach the sprayers to the transformer tank. After that, the oil from the transformer tank bottom is fed through a filter into the heater, where it is heated and sprayed onto the transformer windings under the pressure of 2.5 bar, thereby ensuring that the windings are flushed and evenly warmed up. As a result, moisture begins to exude even from the deepest layers of insulation. Upon completion of the windings warmup stage, oil feed is stopped, and transformer tank vacuuming begins and lasts а few hours.

Transformer oil heating and circulation, as well as transformer tank vacuuming are performed by a CMM plant equipped with a heater, transfer pumps, and a twostage vacuum system capable of developing a high vacuum. This cycle — heating with hot oil and vacuuming — is repeated several times until the moisture content of the solid insulation is not more than 0.5% by mass for new transformers and not more than 1.5% by mass for transformers in operation.

The tanks of some older transformers may not withstand a full vacuum. In this case, it is recommended to either reinforce the tank before vacuuming, or to extract the windings from the transformer and dry them in a US vacuum oven, and then insert them back into the transformer.

Timely drying by hot oil spraying and vacuuming increases the dielectric strength and extends the service life of transformer’s solid insulation by at least 10 years, and more often than not — by a longer period.

For more information:

https://globecore.com
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