Application Research of Frequency Domain Dielectric Response Measuring Technology in Damp Evaluation of Oil-Paper Insulated Capacitive Equipment

Moisture is one of the main factors affecting the insulation performance of oil-paper insulated capacitive equipment. Accurately assessing the insulation condition of wet oil-paper capacitive equipment is the focus of preventive testing of electrical equipment. In this paper, the application of frequency domain dielectric spectroscopy based on dielectric response principle in moisture evaluation of oil-paper insulated capacitor bushing is studied. The testing principle of FDS and PDC and the time-frequency domain dielectric response conversion based on extended Debye model are explained. Through setting up test bushing testing platform and testing analysis of 500kV damp bushing, it is confirmed that the low-frequency dielectric loss value of the FDS test curve can be used as an effective criterion for the insulation of the oil-paper bushing insulation. The frequency domain dielectric response technology is used to evaluate the moisture content of the oil-paper capacitor type bushing. The research results are of great significance to ensure the safe operation of the case.