How To Operate And Maintain Insulators - Electric Field Distribution Method

There are many interfaces in composite composite suspension insulator. It is currently believed that due to poor sealing at the metal end of composite polymer suspension insulator, moisture enters the interior, resulting in the development of electro-induced carbon traces along the interface between the core rod and the sheath or the internal defects of the core rod, which is the most likely and most dangerous fault of composite suspension type insulator. Steep wave test can detect the internal insulation defects of composite composite tension insulator, but this method cannot realize on-site online detection.

The electric field distribution method can detect the internal insulation defects of composite high voltage transmission line insulatorsonline, and the instrument used in this method is relatively simple, and the requirements for external environment such as weather are very low. In the running composite overhead power line insulators, the change curve of electric field strength and potential along the axial direction of the insulation is smooth under normal conditions. When there is a conductivity defect in tension insulator, the potential at this place becomes a constant, so its electric field strength will suddenly decrease, and the electric field distribution curve will no longer be smooth, but will be distorted at the corresponding position, with a depression in the middle and an increase at both ends. Therefore, measuring the axial electric field distribution of the composite dead end insulators string can find the internal insulation conductivity fault of dead end suspension insulators.