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Capacitive Insulation Structure Current Transformer
May 30, 2018

The main insulation of the positive capacitor type insulation structure is all wrapped on the primary winding. If it is an inverted vertical structure, the main insulation is all wrapped on the two winding. The primary winding of the main structure is usually U shape and inverted structure. The two winding often adopts the hanging ring.

In order to make full use of the insulating property of the material, the capacitor has a conductive or semi conductive screen in the insulation, which divides the oil paper insulation into many insulating layers. Each pair of electric screens and the insulating layer is a capacitor. In order to ensure that the voltage is evenly distributed between the screens, the capacitance of each pair of electric screens should be basically the same, usually according to the same amount. The principle of thick insulation is designed, that is, the thickness of the adjacent electrical screens is equal to each other. Under the same voltage, the total thickness of capacitive insulation is thinner than that of chain type insulation, which can save materials and is widely used in 110kV and above current transformers. These screens are also called the main screen, and the inner layer of the screen is connected to each other as an electrical connection, called the zero screen, and the outer layer of the electrical screen is called the terminal screen or the ground screen. The inverted structure is connected with high voltage on the external electric screen and grounded on the innermost screen. In order to improve the distribution of the electric field, a few short end screens (also called auxiliary screens) are set at the end of the two main screen to reduce the thickness of the end insulation screen.


Add: No.38 South Taoyuan Road, Yaozhuang Town,Jiashan County, Jiaxing City, Zhejiang Province, China
Contact person: Elva Zhuang&Sunny Ni
Tel:+86-573-84775555
Fax:+86-573-84776699
Phone:+86-13732570078
E-mail:sales9@great-relay.com
       sunny.ni@great-relay.com