The Simulation Of Large Current Transformer Used In Combined High Voltage And Large Current Power Supply Based On Cable Insulation Technology

With the rapid construction progress of our country power industry, the electrical power industry has obtained a rapid development, power system transmission capacity is expanding, and transmission line has a development trend of high voltage and large current. A lot of electrical power products, which work in high voltage and large current environment, have been put into operation. These equipment need to be tested when they are moved out of the factory. In order to get an accurate result, a real work environment load should be imposed. A test power supply, which can supply high voltage and large current for these equipments, is needed. In addition, the insulation structure of these equipments will face double test, high electric field caused by high voltage and temperature rise caused by large current. Aging and damage will occur inevitably. Therefore, to ensure the reliability of there electric power equipment, their insulation should be detected regularly. If you want to get an accurate result when the insulation structures are tested, the real work conditions should be met as far as possible. Therefore, combined high voltage and large current power supply is an urgent equipment for these test.According to the engineering need and inspired by cable test, a design scheme for combined high voltage and large current power supply, which use cable insulation technology, is put forward. And it is explained in detail. Specific design work of combined high voltage and large current power supply is completed in this paper. Three design schemes for the large current transformer are put forward, and the three design schemes are compared from the consumption of materials as well as engineering feasibility and so on. In final, the design scheme of multiple discrete large current transformers is the selection which is most reasonable in the three design schemes.After the design scheme of multiple discrete large current transformers is selected, the finite element analysis software Ansoft is used to discuss the work loss from three perspectives of different factors. The three factors are the distance between two adjacent small transformer units, the bending radius of cable as well as the concentricity of the two adjacent transformer units. The influence to large current transformer caused by traditional square iron core and annular iron core is also computed and compared in this paper with the help of finite element software. In addition, the temperature field of cable is simulated in this article with the help of finite element software ANSYS. Influence to work loss of combined high voltage and large current power supply caused by different factors as well as the temperature rise characteristics of cable winding is obtained through the software simulation. This can provide basis and guidance for the design and manufacture of large current transformer.