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Charge relaxation on surfaces of polymeric insulating materials for outdoor applications

Sjöstedt H., Montano R., Serdyuk Y., Gubanski S. M.

Materials Science Poland

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2009

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Vol. 27, No. 4/2

1129--1137

EN

The studies have been presented on spatial and temporal distributions of surface charge on samples of ethylene propylene diene monomer (EPDM) and silicon rubber (SIR). The charge was deposited from a positive impulse corona source located at 1 mm above the polymeric surfaces. During the experiments, the number of pulses and their voltage level were varied. It was observed that the spread of the charge over the surface of the samples as well as its magnitude were both increasing with increasing number of impulses applied. EPDM accumulated charge easier and had a longer relaxation time than SIR. A common feature frequently observed in both cases was that the resulting charge distributions had a saddle-like pattern. Performed computer simulations showed that this feature can be attributed to peculiarities of the corona charging in the considered system, which took place in a form of a burst corona, and the dynamics of the deposited charges could be related to burst corona pulses.

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Charge relaxation on surfaces of polymeric insulating materials for outdoor applications.

Sjostedt H., Montano R., Serdyuk Y., Gubański M.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2007

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Vol. 46, nr 19

17-20

EN

This paper presents studies on spatial and temporal distributions of surface charge on samples of Ethylene Propylene Diene Monomer (EPDM) and Silicon Rubber (SIR). The charge was deposited from a positive impulse corona source at 1 mm above the polymeric surfaces. During the experiments, the number of pulses and their voltage level were varied. It was observed that the spread of the charge over the surface of the samples as well as its magnitude were both increasing with increasing number of impulses applied. EPDM accumulated charge easier and had a longer relaxation time than SIR. A common feature frequently observed in both cases was that the resulting charge distributions had a saddle-like pattern. Performed computer simulations showed that this feature can be attributed to peculiarities of the corona charging proc the considered system, which took place in form of a burst corona, and the dynamics of the deposited charges could be related to burst corona pulses.

3

Opady atmosferyczne w Polsce z punktu widzenia izolacji napowietrznej

Chrzan K.

Wiadomości Elektrotechniczne

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2006

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nr 11

44-47

PL

Omówiono wybrane parametry opadów atmosferycznych na przestrzeni ostatnich lat, jako czynnika mającego istotny wpływ na warunki pracy izolatorów napowietrznych.

EN

The paper discusses selected parameters of precipitation over a span of last years, as a significant factor effecting operating conditions of outdoor insulators.

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Behaviour of insulators and surge arresters at pollution test station Głogów

Chrzan K. L.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 40, nr 15

125-128

EN

The paper reports about the pollution conditions, different insulators and surge arresters performance on the test station Głogów from 1981 up to 2004. The environmental protection progress and technology modernization caused a very great decrease in dust and gases emission at copper smelting plant. As a result the pollution zone changed from IV (very heavy) in 1980s to I (light) after 2000. The flashover voltage was measured mainly on porcelain post insulators SWZP4 under natural conditions in 1987 and after insulator wetting with a water spray in 2002-2004. The electrical strength of porcelain insulators was compared with insulators coated by silicone rubber layer and with insulators coated by fluorourethane layer StaClean.