Title :
Waveform analysis of partial discharge current in liquid nitrogen immersed insulation
Author :
Kanegami, Hl ; Hozumi, N. ; Suzuki, H. ; Okamoto, T.
Author_Institution :
Central Res. Inst. of Electr. Power Ind., Yokosuka, Japan
Abstract :
This paper deals with the partial discharge characteristic in liquid nitrogen immersed insulation using a high frequency detection system. AC voltages of 3-6 kV were applied on a needle-plane electrode system in which a polyethylene terephthalate film was inserted. Partial discharge detection was carried out using a wide band current detection system that has a frequency range up to 250 MHz. Frequency analysis was performed in both the low and high frequency bands. It was found that the signal component within the 150-250 MHz range correlated with the discharge mode, whereas that within the 1-1O MHz range correlated with PD charge magnitude. The results suggest that partial discharge measurement in the high frequency range is an effective method for monitoring discharge mode
Keywords :
electric breakdown; electric current measurement; insulation testing; partial discharges; polyethylene insulation; polymer films; waveform analysis; 1 to 250 MHz; 3 to 6 kV; AC voltages; PD charge magnitude; PD pulse current measurement; discharge mode; frequency analysis; high frequency detection system; liquid N2 immersed insulation; needle-plane electrode system; partial discharge current; partial discharge detection; polyethylene terephthalate film; waveform analysis; wide band current detection system; Dielectric liquids; Electrodes; Frequency; Insulation; Nitrogen; Partial discharges; Plastic films; Polyethylene; Voltage; Wideband;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on
Conference_Location :
Millbrae, CA
Print_ISBN :
0-7803-3580-5
DOI :
10.1109/CEIDP.1996.564526
