Matters related to Power Current Transformer failure

1) The insulation of the Power Current Transformer is thick, some of the insulation wraps are slack, and the insulating virtual beam has wrinkles. In addition, the vacuum pump is not well solved, and the pre-impregnation is not complete, forming a gas-containing cavity, which is easy to cause some discharge defects.

2) The limit and placement of the capacitive screen do not conform to the overall planning regulations, but at least the capacitive screen is discharged, and the capacitor pole pieces are uneven and flat, or even displaced or ruptured, which destroys the voltage equalization characteristics. Therefore, when the field strength of a part of the solid insulation along the surface reaches a certain standard value, it will form a part of the discharge. Leakage Power Current Transformer The immediate result of the partial discharge is that the insulating oil is cracked, the insulating virtual beam is converted into a lot of x-wax, and the dielectric loss is expanded. This type of discharge has cumulative effect, and if left unchecked, the gas in oil analysis may have the characteristics of electric solitary discharge.

3) Because the insulating material is not cleaned or has high moisture content, creeping discharge may be caused on its surface. This type of situation is common when the primary terminal wire discharges along the surface of the protective layer pad.

4) Some loose joints or floating of potential difference of metal products will cause flame discharge, such as the looseness of the nut at the support point of the primary winding, forming a primary winding to shield the floating of the potential difference of aluminum and platinum, the contact of the final screen wire or the poor welding of electric welding or even Disconnection will cause such disadvantages.