SIMPLE WAY FOR SOLUTION OF THERMAL FIELDS IN MO-SURGE ARRESTERS

Bystrík Dolník

   ZnO materials are utilized in power engineering and electrotechnics as basic elements of surge arresters with or without gaps. The accelerated ageing method was performed in laboratory conditions - thermal, electrical and combined stress within the range of 0 - 4 000 hours at maximal temperature 140 ^oC - on metal oxide (MO) arresters which are used in 22 kV voltage distribution network. On the basis of leakage current measurements during the ageing of MO-arresters, the simple thermal model of complete MO-arrester was introduced. Thermal processes on the model were solved using electroanalogy method.

Keywords: metal oxide surge arrester, thermal stress

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