Commissioning of a noise free PD measurement lab — A stepwise approach

摘要

Partial discharge (PD) characterization is one of the key diagnostic tool while designing insulation system for high voltage (HV) apparatus or development of novel insulating material. This acts as a fingerprint for its performance during its life cycle. That is why HV lab has immense importance in terms of characterizing novel insulating material, HV insulators and condition monitoring PD sensors. Modern HV apparatus demands for a stringent limit for PD magnitude. The allowable limits are almost comparable with the basic electrical noise level present in any power system. On the other hand, more and more usage of power electronic devices, wireless gadgets increases conductive noises and radioactive noise, concurrently. Setting up a PD measurement lab in an industrial environment is a challenging task. High voltage lab of Raychem innovation center is situated very close to the manufacturing plant and surround by high power equipment of power electronics and material processing laboratory. A case study has been presented in this paper and step by step procedure has been given how the PD noise level has been brought down to less than 2pC level from an initial value of more than 500pC.