Product Categories

Contact Us

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

Exhibition

Home > Exhibition > Content
Common faults of current transformer
Oct 26, 2017

Common faults of current transformer

The common faults of current transformer are often related to manufacturing defects:

1) insulated current transformer is very thick, some wrapping insulation loose, insulating layer between the fold, and the vacuum impregnation is not completely bad, caused by the gas cavity, thereby causing partial discharge fault.

2) the size and arrangement of the capacitor screen do not meet the design requirements, and even less capacitive screen, the capacitor plate is not smooth, even dislocation or fracture, so that the pressure sharing characteristics are destroyed. Therefore, when the local solid insulation along the surface of the field intensity reaches a certain value, it will cause partial discharge.

The direct consequence of the partial discharge is that the insulating oil is cracked and a large amount of X wax is generated between the insulating layers, and the dielectric loss is increased. This discharge has a cumulative effect, allowing it to develop, the analysis of gas in oil will be possible to arc discharge characteristics.

3) surface discharge may occur on the surface of the insulating material due to its poor cleanliness or high humidity. This situation is often seen in the discharge of a terminal lead along the surface of the pad.

4) some loose connections or metal potential suspension will cause spark discharge, such as a winding support nut loose, causing a potential suspension winding shielding foil, lead to bad welding end screen contact or even disconnection, can cause such failures.

5) the secondary connection plate, bolt, nut loose, the end screen nut loose, screw nut loosening, etc., may cause contact resistance to increase, leading to local overheating fault. In addition, improper on-site maintenance management should also pay attention to. For example, the transformer water wetting, although it may be related to the sealing structure and sealing materials of the manufacturer, but there are also maintenance and management issues. Generally speaking, the vacuum degassing is not sufficient or vacuum drying is not performed during the overhaul, which makes the dissolved gas in oil easy to saturate or the residual bubbles and moisture content in oil paper insulation are higher. All of this will leave the device with security risks.

  

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