Cable specimen length effects on the response of corona pulse detectors

An extensive study has been carried out on the response characteristics of RCL-type corona detectors as a function of cable length, using terminated and unterminated XLPE insulated distribution power-cable specimens. The corona detection circuit response was examined both in the time and frequency domains, utilizing calibration pulse rise times between 0.1 and 20 µs. Particular attention was given to errors arising with unterminated cable specimens and the techniques on how these may be eliminated with suitable high voltage terminations. The transition between lumped circuit and distribution parameter or transmission line behavior was also considered.