Dry-type transformer manufacturers introduce how to select transformers

Dry-type transformer manufacturer introduction There are many transformer manufacturers on the market, and the products they produce are many models and of varying quality. When we choose a dry-type transformer, what aspects should we use to measure the quality of a dry-type transformer?

Temperature control system for dry-type transformers. The safe operation and service life of dry-type transformers largely depend on the safety and reliability of the transformer winding insulation. When the winding temperature exceeds the insulation withstand temperature, causing insulation damage, it is one of the main reasons why the transformer cannot work normally. Therefore, monitoring the operating temperature of the transformer and its alarm control are very important. Dry-type transformer protection methods. Depending on the operating environment characteristics and protection requirements, different shells can be selected for dry-type transformers. IP20 protective shells are usually used to prevent solid foreign objects with a diameter greater than 12mm and small animals such as rats, snakes, cats, and finches from entering, causing short circuits and power outages and other vicious failures, and provide a safety barrier for live parts. If the transformer needs to be installed outdoors, an IP23 protective enclosure can be used. In addition to the above-mentioned IP20 protection function, it can also prevent water dripping within an angle of 60° from the vertical line. Dry-type transformer cooling method. Dry-type transformer cooling methods are divided into natural air cooling and forced air cooling. When naturally air-cooled, the transformer can operate continuously for a long time at rated capacity. When forced air cooling, the output capacity of the transformer can be increased by 50%, which is suitable for intermittent overload operation or emergency overload operation; due to the large increase in load loss and impedance voltage during overload, it is in a non-economic operating state, so it should not Keep it in continuous overload operation for a long time. Overload capacity of dry-type transformers. The overload capacity of a dry-type transformer is related to the ambient temperature, the load condition before overload (initial load), the insulation heat dissipation condition of the transformer and the heating time constant. If necessary, the overload curve of the dry-type transformer can be obtained from the manufacturer.