Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil

M.P. Wilson, M.J. Given, I. Timoshkin, S.J. MacGregor, M.A. Sinclair, K.J. Thomas

Research output: Contribution to conferencePaper

Abstract

Surface flashover of dielectric components chosen to insulate high-voltage, pulsed-power machines is a limiting factor in the attainment of stable operation of such machines, and selection procedures for materials to be used under conditions with impulse rise-times in the nanosecond regime and associated high rates-of-change of electrical field are not well defined. The focus of the present work was therefore an experimental comparison of the flashover performance of four different polymeric dielectric materials, immersed in insulating oil, when subjected to fast-rising ( 100 ns) impulse voltages. The time to breakdown/ breakdown voltage of samples of: polypropylene; low-density polyethylene; ultra-high molecular weight polyethylene; and Rexolite; was analysed in both non-uniform and uniform fields. Low-density polyethylene showed the most consistent point of breakdown in non-uniform fields, for example with 94% of the data points located in the range between 138-204 ns and 282-332 kV for one set of test conditions. Ultra-high molecular weight polyethylene exhibited longer delay times to breakdown than the other materials. Measurements in uniform fields were restricted by the occurrence of bulk breakdown events. The results will provide data for high-voltage system designers for the appropriate choice of dielectric materials to insulate machines.

Conference

ConferenceThe 44th International Universities' Power Engineering Conference
CountryUnited Kingdom
CityGlasgow
Period1/09/094/09/09

Fingerprint

flashover
impulses
polyethylenes
oils
breakdown
high voltages
molecular weight
polypropylene
electrical faults
time lag
occurrences
electric potential

Keywords

  • dielectric materials
  • flashover
  • insulating oils
  • machine insulation
  • polymers
  • pulsed power technology
  • surface discharges
  • dielectric breakdown

Cite this

Wilson, M. P., Given, M. J., Timoshkin, I., MacGregor, S. J., Sinclair, M. A., & Thomas, K. J. (2009). Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil. 1-5. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.
Wilson, M.P. ; Given, M.J. ; Timoshkin, I. ; MacGregor, S.J. ; Sinclair, M.A. ; Thomas, K.J. / Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.5 p.
@conference{b4ad770815474ed789b9f91b628e5cf9,
title = "Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil",
abstract = "Surface flashover of dielectric components chosen to insulate high-voltage, pulsed-power machines is a limiting factor in the attainment of stable operation of such machines, and selection procedures for materials to be used under conditions with impulse rise-times in the nanosecond regime and associated high rates-of-change of electrical field are not well defined. The focus of the present work was therefore an experimental comparison of the flashover performance of four different polymeric dielectric materials, immersed in insulating oil, when subjected to fast-rising ( 100 ns) impulse voltages. The time to breakdown/ breakdown voltage of samples of: polypropylene; low-density polyethylene; ultra-high molecular weight polyethylene; and Rexolite; was analysed in both non-uniform and uniform fields. Low-density polyethylene showed the most consistent point of breakdown in non-uniform fields, for example with 94{\%} of the data points located in the range between 138-204 ns and 282-332 kV for one set of test conditions. Ultra-high molecular weight polyethylene exhibited longer delay times to breakdown than the other materials. Measurements in uniform fields were restricted by the occurrence of bulk breakdown events. The results will provide data for high-voltage system designers for the appropriate choice of dielectric materials to insulate machines.",
keywords = "dielectric materials, flashover, insulating oils, machine insulation, polymers, pulsed power technology, surface discharges, dielectric breakdown",
author = "M.P. Wilson and M.J. Given and I. Timoshkin and S.J. MacGregor and M.A. Sinclair and K.J. Thomas",
year = "2009",
month = "9",
language = "English",
pages = "1--5",
note = "The 44th International Universities' Power Engineering Conference ; Conference date: 01-09-2009 Through 04-09-2009",

}

Wilson, MP, Given, MJ, Timoshkin, I, MacGregor, SJ, Sinclair, MA & Thomas, KJ 2009, 'Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil' Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom, 1/09/09 - 4/09/09, pp. 1-5.

Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil. / Wilson, M.P.; Given, M.J.; Timoshkin, I.; MacGregor, S.J.; Sinclair, M.A.; Thomas, K.J.

2009. 1-5 Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil

AU - Wilson, M.P.

AU - Given, M.J.

AU - Timoshkin, I.

AU - MacGregor, S.J.

AU - Sinclair, M.A.

AU - Thomas, K.J.

PY - 2009/9

Y1 - 2009/9

N2 - Surface flashover of dielectric components chosen to insulate high-voltage, pulsed-power machines is a limiting factor in the attainment of stable operation of such machines, and selection procedures for materials to be used under conditions with impulse rise-times in the nanosecond regime and associated high rates-of-change of electrical field are not well defined. The focus of the present work was therefore an experimental comparison of the flashover performance of four different polymeric dielectric materials, immersed in insulating oil, when subjected to fast-rising ( 100 ns) impulse voltages. The time to breakdown/ breakdown voltage of samples of: polypropylene; low-density polyethylene; ultra-high molecular weight polyethylene; and Rexolite; was analysed in both non-uniform and uniform fields. Low-density polyethylene showed the most consistent point of breakdown in non-uniform fields, for example with 94% of the data points located in the range between 138-204 ns and 282-332 kV for one set of test conditions. Ultra-high molecular weight polyethylene exhibited longer delay times to breakdown than the other materials. Measurements in uniform fields were restricted by the occurrence of bulk breakdown events. The results will provide data for high-voltage system designers for the appropriate choice of dielectric materials to insulate machines.

AB - Surface flashover of dielectric components chosen to insulate high-voltage, pulsed-power machines is a limiting factor in the attainment of stable operation of such machines, and selection procedures for materials to be used under conditions with impulse rise-times in the nanosecond regime and associated high rates-of-change of electrical field are not well defined. The focus of the present work was therefore an experimental comparison of the flashover performance of four different polymeric dielectric materials, immersed in insulating oil, when subjected to fast-rising ( 100 ns) impulse voltages. The time to breakdown/ breakdown voltage of samples of: polypropylene; low-density polyethylene; ultra-high molecular weight polyethylene; and Rexolite; was analysed in both non-uniform and uniform fields. Low-density polyethylene showed the most consistent point of breakdown in non-uniform fields, for example with 94% of the data points located in the range between 138-204 ns and 282-332 kV for one set of test conditions. Ultra-high molecular weight polyethylene exhibited longer delay times to breakdown than the other materials. Measurements in uniform fields were restricted by the occurrence of bulk breakdown events. The results will provide data for high-voltage system designers for the appropriate choice of dielectric materials to insulate machines.

KW - dielectric materials

KW - flashover

KW - insulating oils

KW - machine insulation

KW - polymers

KW - pulsed power technology

KW - surface discharges

KW - dielectric breakdown

UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5429554

M3 - Paper

SP - 1

EP - 5

ER -

Wilson MP, Given MJ, Timoshkin I, MacGregor SJ, Sinclair MA, Thomas KJ. Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil. 2009. Paper presented at The 44th International Universities' Power Engineering Conference, Glasgow, United Kingdom.