Partial discharge measurements of streamers in liquid nitrogen under AC voltages using UHF sensor
Partial discharge measurements of streamers in liquid nitrogen under AC voltages using UHF sensor
The pre-breakdown phenomena, have been studied with the aim to further understand the use of liquid nitrogen as a part of insulation system in High Temperature Superconducting (HTS) devices. Previous studies have shown that streamer discharges in liquid dielectrics can appear in the form of pulse trains which are thought to be the results of density-change channels expanding and collapsing. This behavior cannot be observed by the conventional partial discharge (PD) measurement method due to its narrow bandwidth (less than 600 kHz). Instead, a slowly damped pulse is recorded, which shows the integration of many faster pulses. The application of ultra high frequency (UHF) sensor with the bandwidth up to 3 GHz can provide further details of discharge events during streamer initiation and propagation in LN2. An experiment has been designed to measure discharges using narrow and wideband sensors simultaneously. The conventional method following IEC 60270 standards allow measuring the apparent charge at the terminals while UHF sensor details individual events. In addition, discharge signals can be time correlated to images of density-change streamer captured by high speed digital imaging with stroboscopic backlighting. Analysis of obtained results reinforces the proposed mechanism for the characteristics of streamer production in LN2
978-1-4673-1252-3
68-71
Truong, L.H.
9aaef951-d28e-4f6a-b5a2-669b92a426c0
Lewin, P.L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Judd, M.D.
eeb7c68c-cf27-4778-a60a-38cea485f0a4
14 October 2012
Truong, L.H.
9aaef951-d28e-4f6a-b5a2-669b92a426c0
Lewin, P.L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Judd, M.D.
eeb7c68c-cf27-4778-a60a-38cea485f0a4
Truong, L.H., Lewin, P.L. and Judd, M.D.
(2012)
Partial discharge measurements of streamers in liquid nitrogen under AC voltages using UHF sensor.
2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Montreal, Canada.
14 - 17 Oct 2012.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
The pre-breakdown phenomena, have been studied with the aim to further understand the use of liquid nitrogen as a part of insulation system in High Temperature Superconducting (HTS) devices. Previous studies have shown that streamer discharges in liquid dielectrics can appear in the form of pulse trains which are thought to be the results of density-change channels expanding and collapsing. This behavior cannot be observed by the conventional partial discharge (PD) measurement method due to its narrow bandwidth (less than 600 kHz). Instead, a slowly damped pulse is recorded, which shows the integration of many faster pulses. The application of ultra high frequency (UHF) sensor with the bandwidth up to 3 GHz can provide further details of discharge events during streamer initiation and propagation in LN2. An experiment has been designed to measure discharges using narrow and wideband sensors simultaneously. The conventional method following IEC 60270 standards allow measuring the apparent charge at the terminals while UHF sensor details individual events. In addition, discharge signals can be time correlated to images of density-change streamer captured by high speed digital imaging with stroboscopic backlighting. Analysis of obtained results reinforces the proposed mechanism for the characteristics of streamer production in LN2
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Published date: 14 October 2012
Venue - Dates:
2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Montreal, Canada, 2012-10-14 - 2012-10-17
Organisations:
EEE
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Local EPrints ID: 344284
URI: http://eprints.soton.ac.uk/id/eprint/344284
ISBN: 978-1-4673-1252-3
PURE UUID: ef4b96e6-4aee-4a72-9d7e-9e478bfb81e1
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Date deposited: 17 Oct 2012 14:00
Last modified: 15 Mar 2024 02:43
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Author:
L.H. Truong
Author:
P.L. Lewin
Author:
M.D. Judd
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