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Partial discharge in mass-impregnated, lapped PPLP cables

Partial discharge in mass-impregnated, lapped PPLP cables
Partial discharge in mass-impregnated, lapped PPLP cables
The work presented here tackles three key objectives: Firstly, a method of producing realistic models of lapped HVDC cables is devised and implemented. Secondly, the properties of poly propylene laminated paper (PPLP) as used in mass impregnated (MI), HVDC cables are investigated. Finally, partial discharge (PD) measurements are made under DC conditions in order to assess the suitability of this method for online condition monitoring of HVDC assets. In-house fabrication of model HVDC cables makes it possible to deliberately insert defects into the samples during manufacture. The PD behavior of mass impregnated samples is thereby compared with dry lapped ones and it is shown that dry samples (or dry regions within a cable) exhibit higher rates of PD but with decreased average PD charge. In addition, DC PD is measured for specimens that are subjected to bending. In this study no clear change in DC PD is observed due to bending (even up to the point of failure due to breakdown). Dissection of a sample that has broken down reveals the extensive damage caused by the bending. It is concluded that DC PD tests are relatively insensitive to cable bending defects and that fluid impregnant may further mask these. DC PD is, however, quite sensitive to incomplete impregnation and may be well suited to continuous monitoring where large data sets are available.
HVDC, PPLP, PD, MI, Cable
2576-6791
403-406
IEEE
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Lewin, Paul
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Praeger, Matthew, Xu, Zhiqiang, Lewin, Paul and Chen, Guanghui (2018) Partial discharge in mass-impregnated, lapped PPLP cables. In 2018 IEEE Electrical Insulation Conference (EIC). IEEE. pp. 403-406 . (doi:10.1109/EIC.2018.8481074).

Record type: Conference or Workshop Item (Paper)

Abstract

The work presented here tackles three key objectives: Firstly, a method of producing realistic models of lapped HVDC cables is devised and implemented. Secondly, the properties of poly propylene laminated paper (PPLP) as used in mass impregnated (MI), HVDC cables are investigated. Finally, partial discharge (PD) measurements are made under DC conditions in order to assess the suitability of this method for online condition monitoring of HVDC assets. In-house fabrication of model HVDC cables makes it possible to deliberately insert defects into the samples during manufacture. The PD behavior of mass impregnated samples is thereby compared with dry lapped ones and it is shown that dry samples (or dry regions within a cable) exhibit higher rates of PD but with decreased average PD charge. In addition, DC PD is measured for specimens that are subjected to bending. In this study no clear change in DC PD is observed due to bending (even up to the point of failure due to breakdown). Dissection of a sample that has broken down reveals the extensive damage caused by the bending. It is concluded that DC PD tests are relatively insensitive to cable bending defects and that fluid impregnant may further mask these. DC PD is, however, quite sensitive to incomplete impregnation and may be well suited to continuous monitoring where large data sets are available.

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More information

Submitted date: 24 January 2018
e-pub ahead of print date: 4 October 2018
Venue - Dates: 2018 IEEE Electrical Insulation Conference, Hyatt Regency Hotel San Antonio Riverwalk, United States, 2018-06-17 - 2018-06-20
Keywords: HVDC, PPLP, PD, MI, Cable

Identifiers

Local EPrints ID: 418675
URI: http://eprints.soton.ac.uk/id/eprint/418675
ISSN: 2576-6791
PURE UUID: c4e3c51c-a373-4015-9e29-6be1c1ffc163
ORCID for Matthew Praeger: ORCID iD orcid.org/0000-0002-5814-6155
ORCID for Zhiqiang Xu: ORCID iD orcid.org/0000-0002-6640-7335

Catalogue record

Date deposited: 16 Mar 2018 17:30
Last modified: 18 Feb 2021 17:14

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Contributors

Author: Matthew Praeger ORCID iD
Author: Zhiqiang Xu ORCID iD
Author: Paul Lewin
Author: Guanghui Chen

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