Title :
PD patterns and PD current shapes of LDPE specimen with a void
Author :
Nakao, Kaori ; Suzuoki, Yasuo ; Mizutani, Teruyoshi
Author_Institution :
Nagoya Univ., Japan
Abstract :
The PD pattern and PD current shape changed with time, and were related to each other. The combination of current shape change with PD patterns is expected to improve the reliability of insulation degradation. The first PD in the “rabbit-like” pattern was streamer-like and different from the others. This suggests that the first PD takes place under a large overvoltage and its mechanism is different from the others even at the same degradation stage. The PD current shape and magnitude depended on void size, which suggests the possibility of diagnosis of void size and shape. Further study on PD pattern and PD current shape is required to clarify the relationship between the degradation and PD characteristics and realize reliable insulation diagnosis
Keywords :
insulation testing; partial discharge measurement; polyethylene insulation; voids (solid); LDPE specimen; PD current shapes; PD patterns; insulation degradation reliability; insulator/air gap/insulator structure; large overvoltage; rabbit-like pattern; reliable insulation diagnosis; streamer-like pattern; void shape; void size; Current measurement; Degradation; Electrodes; Insulation; Partial discharges; Phase change materials; Phase measurement; Resistors; Shape measurement; Voltage;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on
Conference_Location :
Vasteras
Print_ISBN :
0-7803-4237-2
DOI :
10.1109/ICSD.1998.709249
