Understanding surface discharge activity in copper sulphide diffused oil impregnated pressboard under AC voltages
作者： R. Sarathi , I. Merin Sheema , J. Rajan
关键词: Pressboard 、 Rise time 、 Chemistry 、 Surface charge 、 Energy-dispersive X-ray spectroscopy 、 Transformer oil 、 Partial discharge 、 Current (fluid) 、 Copper 、 Analytical chemistry
摘要: The surface discharge injected current were measured by using High Frequency Current Transformer (HFCT). It is observed that the rise time of pulse about 800ps. In addition, pulses has not altered in copper sulphide (CuS) diffused Oil Impregnated Pressboard (OIP) material, but width signal increased with increase amount diffusion into pressboard. confirmed radiates Ultra (UHF) and dominant frequency UHF formed due to 0.9 GHz. characteristic contents activity same virgin pressboard material. inception voltage high specimen compared oil impregnated paper insulating material irrespective it. Phase Resolved Partial Discharge (PRPD) analysis indicates at point inception, occurs peak applied AC when magnitude increased, rising portion voltage. characteristics discharges are noticed ageing time, a reduction partial observed. Attenuated total reflectance Fourier transform infra-red spectroscopy (ATR-FTIR) was carried out understand changes occur degraded zone discharges. measurement charge increases accumulation. Energy Dispersive Spectroscopy (EDS) confirms presence sulphur aged Atomic Absorption (AAS) results indicate content have time.
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