Oil immersed transformer classification and Protection

According to the number of single-phase transformer to distinguish, it can be divided into three-phase transformers and single phase transformer. In a three-phase power system, the general application of the three-phase transformer, when the oversized transport conditions and subject to three phase pad mounted transformer system can also be applied consisting of three single phase pole mounted transformers group. According to the number of windings can be divided into two-winding transformer and three-winding transformers. The transformers are usually two-winding transformer, namely on the core has two windings, one for the primary winding, one for the secondary winding. Three-winding transformer larger capacity transformer (5600 kVA or more) to connect the three different voltage power lines. In special circumstances, also applied more windings.
According to the structure in the form of classification, it can be divided into core type transformers and transformer steel. As compared with the winding package in the core periphery core type transformer; as the core periphery was wrapped in winding transformer steel. But both are slightly different in structure, there is no essential difference in principle. Power transformers are all core type.