Title :
The comparison of sensitivity between the UHF and ultrasonic methods for partial discharge detecting in GIS
Author :
Geng, Bibo ; Li, Chengrong ; Qi, Bo ; Yu, Le ; Gao, Jixin
Author_Institution :
High Voltage & EMC Beijing Area Major Lab., North China Electr. Power Univ. Beijing, Beijing, China
Abstract :
In order to compare the sensitivity between the UHF and ultrasonic methods for partial discharge detecting in GIS, a 252kV GIS experimental platform was established. Four typical defect models are taken into consideration, including metal particle stuck on the insulator surface; free metal particle on the insulator surface; ground electrode defect and poor contact of high voltage electrode. Through the PD inception voltage and the PRPD (phase resolved partial discharge) spectrogram of UHF and ultrasonic signals, the sensitivity and feature of UHF and ultrasonic methods could be compared. The results indicate that: 1) Compared to the ultrasonic method, the UHF method could detect all four defects mentioned above with high sensitivity. 2) The ultrasonic method could only detect some models with high sensitivity.
Keywords :
UHF detectors; earth electrodes; gas insulated substations; insulators; partial discharges; sensitivity; ultrasonic applications; GIS experimental platform; PD inception voltage; PRPD spectrogram; UHF methods sensitivity; UHF signals; defect models; free metal particle; gas insulated substation; ground electrode defect; high voltage electrode; insulator surface; partial discharge detection; phase resolved partial discharge; ultrasonic methods sensitivity; ultrasonic signals; voltage 252 kV; Acoustics; Discharges; Electrodes; Gas insulation; Insulators; Partial discharges; Sensitivity; GIS; Partial discharge; UHF; Ultrasonic; comparison; sensitivity;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2011 Annual Report Conference on
Conference_Location :
Cancun
Print_ISBN :
978-1-4577-0985-2
DOI :
10.1109/CEIDP.2011.6232696