Digest report of investigation committee on advanced measurement methods on partial discharges in electrical apparatus

Summary form only given. On-line partial discharge (PD) monitors have been intensively developed and commercially available at present. Generally, newly developed monitors tend to adopt higher frequency in detecting circuits to avoid the noise in lower frequency regions. On the other hand, rotating machines have large inductance and capacitance along windings, which cause the deformation of original wave form of PD pulse during propagation from PD source to detecting couplers. So more discussions and cautions are necessary for practical application of the monitors as CBMtools. Recently IEEE Power Engineering Society has issued a new guide IEEE Std 1434-2000 "IEEE Trial-Use Guide to the Measurement of Partial Discharges in Rotating Machinery". The standard involves important and beneficial information especially for maintenance engineers. Dielectric and Electrical Insulation Technical Committee, IEE Japan has also strong concerns on on-line PD measurements of rotating machines with above-mentioned reasons and started a new investigation committee. The new committee started January 16th, 2001 with 20 members from electric power utilities, universities and manufacturers. Based upon the bibliography of IEEE Std 1434, original papers on PD monitoring including Japanese papers are investigated in detail. Final Technical Report will be issued from IEE Japan in 2003.