Dry-type transformer basic operation

Under normal circumstances, the dry-type transformer load should be maintained at about 85% of rated capacity is better. substations and transformers in overload operation, we must pay attention to monitor its operating temperature: If the temperature rises to 155 ℃ (with alarm issued) that should be taken to reduce load measures (minus some of the secondary load), to ensure that dry-type transformers insulation is not influences. Dry-type transformers should be rated capacity, without affecting its life under the circumstances allows overload operation in a short time, for indoor transformers, the overload value should not exceed 20%. Winding temperature exceeds the insulation temperature of the insulation aging, thus affecting its service life is one of the main reasons leading to not work properly, so the on load tap changer transformer operating temperature monitoring and alarm control is very important. Dry-type transformer safe operation and service life, largely depends on the transformer winding insulation is safe and reliable. Despite the better moisture, but the air will be adsorbed on the insulation surface of the dust, so that along the flashover voltage decreases, the dust in the wet weather, there will be pollution flash phenomenon. Therefore, the dust should be regularly checked and check whether the discharge signs. Dry-type transformers in operation, but also pay attention to check whether the differences in sound, bus connection cable with or without abnormalities, abnormal phenomena found in time to avoid accidents. As the operating temperature is directly related to the service life of dry-type transformers, so the distribution of operational personnel should focus on inspection and maintenance of fan automatic control system, over-temperature alarm, trip system and temperature display system.