The Study Of Leakage Magnetic And Temperature Field In Dry-Type Transformer

With the city's power grid increased, City Network Substation become more and more in the urban and residential areas. Dry-type transformers will be a wide range of applications. In constant demand, Dry-type transformer itself also obtained huge development. Because of dry-type transformer has many advantages, such as: it meet high filthy, hot and humid environment, having anti-burns, bears burns, maintenance and a series of advantages. Therefore more and more is applied to high-rise building and the business center, the petroleum and chemical industries where have higher requirements to fire safety and security. So analyse the leakage magnetic field and temperature field of dry-type transformer is important.The design of transformer electromagnetic and the leakage magnetic field are related closely. The larger transformer capability is ,the greater the leakage magnetic and the loss will be. If the transformer is not designed properly, the partial overheating caused by the loss in the transformer may destroy the thermal properties of the transformer and at last lead to aging and breakdown the insulation material. When the electrical power system occur short circuit, the leakage magnetic field caused by the short current may generate great mechanical power, making a great threat to the insulation and mechanical structure of the transformer. In order to alleviate the influences caused by the above two aspects ,it is very important to fully analyze the leakage of the dry-type transformer.According to the principle of electromagnetic field, with the Finite method, the two dimensional finite element models of Dry-type transformer are established. The fields are analyzed with the MAXWELL software of the ANSOFT company. From these analysis we got the leakage magnetic field in the high-voltage winding, Low-voltage winding and between them. This plays a fundamental role in research of temperature rising, eddy current loss, sudden-short-circuit and other electro-magnetic parameters in Dry type transformer.Based on the total losses in the transformer, according to the principle of the thermodynamics and hydrodynamics, the finite element models of temperature field and flow field of dry-type transformer are established. The fields are analyzed with the solid-flow coupling modules in ANSYS software.