Picture of boy being examining by doctor at a tuberculosis sanatorium

Understanding our future through Open Access research about our past...

Strathprints makes available scholarly Open Access content by researchers in the Centre for the Social History of Health & Healthcare (CSHHH), based within the School of Humanities, and considered Scotland's leading centre for the history of health and medicine.

Research at CSHHH explores the modern world since 1800 in locations as diverse as the UK, Asia, Africa, North America, and Europe. Areas of specialism include contraception and sexuality; family health and medical services; occupational health and medicine; disability; the history of psychiatry; conflict and warfare; and, drugs, pharmaceuticals and intoxicants.

Explore the Open Access research of the Centre for the Social History of Health and Healthcare. Or explore all of Strathclyde's Open Access research...

Image: Heart of England NHS Foundation Trust. Wellcome Collection - CC-BY.

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

Wilson, M.P. and Given, M.J. and Timoshkin, I. and MacGregor, S.J. and Sinclair, M.A. and Thomas, K.J. (2009) Impulse-driven surface flashover of polymeric dielectric materials immersed in insulating oil. In: The 44th International Universities' Power Engineering Conference, 2009-09-01 - 2009-09-04.

Full text not available in this repository. Request a copy from the Strathclyde author


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.