IEEE 1291-1993 (R2005) pdf free.IEEE Guide for Partial Discharge Measurement in Power Switchgear.
IEEE 1291 Partial discharge measurement in switchgear equipment can be made on the basis of measurement of the apparentcharge.Relevant measuring systems are classified as narrow-band or wide-band systems. Both systems are recognizedand widely used.General principles of partial discharge measurement，including both broad and narrow-bandmethods, are covered in IEEE Std C57.113-1991 and IEC 270 (1981).1
The use of partial discharge testing as a tool to assess the integrity of insulation systems requires a great deal ofjudgment. It should not be used as a general, all inclusive test such as the 60 Hz and impulse dielectric tests. Althoughit may be appropriate to perform a partial discharge test on an entire device for some types of equipment, practice tendsto indicate that it should be used to evaluate component parts of apparatus. If partial discharges on apparatus areassociated with self-restoring insulation, such as air, and do not affect nearby non-self-restoring insulation materials,then relatively high levels of partial discharge may be acceptable if the resultant radio influence voltage (RIV) leveland the audible discharge noise level is acceptable, see NEMA 107-1987.It may be necessary to temporarily isolateareas of high partial discharge so that other more critical areas involving non-self-restoring insulations may be morecarefully evaluated.Immersing components in oil or SF, gas is an accepted means of isolating noncritical areas so thatcritical areas can be tested. Thus, partial discharge testing is used more effectively to evaluate isolated areas of highdielectric stress that are judged to have the probability of deterioration of their non-self-restoring insulation.
acceptable terminal partial discharge level: The specified maximum terminal partial discharge level for whichmeasured terminal partial discharge values exceeding this value are considered unacceptable. This level may bedefined by the appropriate apparatus test standard or may be a level agreed to by the user and manufacturer. Themethod of measurement and the test voltage for a given test object must be specified with respect to the acceptableterminal partial discharge level.IEEE 1291 pdf download.