Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage
With the increase in the voltage and capacitance of gas-insulated transmission lines (GILs), the insulation failure of GIL has attracted more and more attention. Further understanding of the partial discharge (PD) and flashover characteristics of metal particles on the insulator surface, as well as...
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doaj-c7ba5fc2c63f45688edb0eac4e792b752021-04-02T11:47:44ZengWileyHigh Voltage2397-72642020-01-0110.1049/hve.2019.0222HVE.2019.0222Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltageLi Xing0Liu Weidong1Liu Weidong2Xu Yuan3Chen Weijiang4Bi Jiangang5Tsinghua UniversityTsinghua UniversityTsinghua UniversityChina Electric Power Research InstituteState Grid Corporation of ChinaChina Electric Power Research InstituteWith the increase in the voltage and capacitance of gas-insulated transmission lines (GILs), the insulation failure of GIL has attracted more and more attention. Further understanding of the partial discharge (PD) and flashover characteristics of metal particles on the insulator surface, as well as the flashover mechanism, is necessary to reduce the failure rate and improve the reliability of the equipment. In this study, an ultra-high voltage (UHV) AC insulator PD test and measurement system based on the cross-reference pulse current (PC) and ultra-high frequency (UHF) methods were established. The PD development and flashover characteristics of 5 mm-long metal particles at different positions on the surface of a UHV AC insulator, as well as the surface charge accumulation, were studied. The results show that the discharge of millimetre-scale metal particles on the insulator surface under PD test conditions is relatively low (generally lower than 2PC), and it is difficult to be detected by the conventional PC and UHF methods due to their insufficient sensitivity. Moreover, it is found that the weak PDs of the millimetre-scale metal particles will result in a charge accumulation on the insulator surface under AC voltage, which eventually will lead to the insulator flashover. The PDs of the UHV AC insulator before flashover are generally small, which will make it difficult for online monitoring systems to give an effective alarm before flashover.https://digital-library.theiet.org/content/journals/10.1049/hve.2019.0222surface charginggas insulated transmission linespartial dischargesflashoverinsulator testingmillimetre-scale metal particlesinsulator surfaceac voltageinsulator flashoveruhv ac insulatorsurface charge accumulationpre-flashover characteristicsgilgas-insulated transmission linespartial dischargeflashover mechanismmeasurement systemmetal particlesvoltage 1100.0 kv |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Li Xing Liu Weidong Liu Weidong Xu Yuan Chen Weijiang Bi Jiangang |
spellingShingle |
Li Xing Liu Weidong Liu Weidong Xu Yuan Chen Weijiang Bi Jiangang Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage High Voltage surface charging gas insulated transmission lines partial discharges flashover insulator testing millimetre-scale metal particles insulator surface ac voltage insulator flashover uhv ac insulator surface charge accumulation pre-flashover characteristics gil gas-insulated transmission lines partial discharge flashover mechanism measurement system metal particles voltage 1100.0 kv |
author_facet |
Li Xing Liu Weidong Liu Weidong Xu Yuan Chen Weijiang Bi Jiangang |
author_sort |
Li Xing |
title |
Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage |
title_short |
Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage |
title_full |
Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage |
title_fullStr |
Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage |
title_full_unstemmed |
Surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kV GILs under AC voltage |
title_sort |
surface charge accumulation and pre-flashover characteristics induced by metal particles on the insulator surfaces of 1100 kv gils under ac voltage |
publisher |
Wiley |
series |
High Voltage |
issn |
2397-7264 |
publishDate |
2020-01-01 |
description |
With the increase in the voltage and capacitance of gas-insulated transmission lines (GILs), the insulation failure of GIL has attracted more and more attention. Further understanding of the partial discharge (PD) and flashover characteristics of metal particles on the insulator surface, as well as the flashover mechanism, is necessary to reduce the failure rate and improve the reliability of the equipment. In this study, an ultra-high voltage (UHV) AC insulator PD test and measurement system based on the cross-reference pulse current (PC) and ultra-high frequency (UHF) methods were established. The PD development and flashover characteristics of 5 mm-long metal particles at different positions on the surface of a UHV AC insulator, as well as the surface charge accumulation, were studied. The results show that the discharge of millimetre-scale metal particles on the insulator surface under PD test conditions is relatively low (generally lower than 2PC), and it is difficult to be detected by the conventional PC and UHF methods due to their insufficient sensitivity. Moreover, it is found that the weak PDs of the millimetre-scale metal particles will result in a charge accumulation on the insulator surface under AC voltage, which eventually will lead to the insulator flashover. The PDs of the UHV AC insulator before flashover are generally small, which will make it difficult for online monitoring systems to give an effective alarm before flashover. |
topic |
surface charging gas insulated transmission lines partial discharges flashover insulator testing millimetre-scale metal particles insulator surface ac voltage insulator flashover uhv ac insulator surface charge accumulation pre-flashover characteristics gil gas-insulated transmission lines partial discharge flashover mechanism measurement system metal particles voltage 1100.0 kv |
url |
https://digital-library.theiet.org/content/journals/10.1049/hve.2019.0222 |
work_keys_str_mv |
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