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1 Poznan University of Technology Academic Journals. Electrical Engineering

1 2011

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The effect of aluminum oxide layer located at the electrode surface on the electric strength of an insulation system provided with sulphur hexafluoride

Zakrzewski S., Opydo W.

Poznan University of Technology Academic Journals. Electrical Engineering

2011

No. 67-68

123-129

The paper presents investigation results of the effect of aluminum oxide layer located at the electrode surface on the electric strength of an insulation system with sulphur hexafluoride (SF6) subject to alternate voltage of 50 Hz frequency. The tests have been carried out under the SF6 pressure of 1*105, 3*105 and 5*105 Pa. It was found that in case of the insulation system with SF6 the electrode surface covered with the aluminum oxide layer improves the electric strength of the system, from 12 to 30 percent, according to the gas pressure. The electrode surface covered with double insulation layer composed of aluminum oxide and polyurethane or silicon paint gave still better improvement of the strength of the SF6 insulation system. In order to determine the parameters of the formula describing the mathematical dependence of the electric strength of the considered systems on the applied pressure the Statistica computer software has been used.