Comparison of Clearances Applying IEEE and IEC Standards for 230 kV Air Insulated Substation
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Abstract
This paper analyzes the insulation levels and electrical air clearances of 230 kV air insulated substation (AIS). In order to get the basic lightning impulse insulation level (BIL) and clearances, the crest voltages at any equipment are required. By applying calculation method taken from IEEE Std. 1313.2, IEEE Std. 1427 and IEC 60071-2 the insulation levels and clearances have been found out and compared. The simplified calculation and simplified digital simulation via EMTP-ATPDraw have also been analyzed. The effect of elevation from sea level as well as the switching surge have been considered for insulation levels and clearances as recommended by the standards. According to IEEE Std. 1427 which taking into account the basic switching impulse insulation levels (BSL), the iterative method is inevitably required. Moreover, at this voltage level, the procedure for calculations refer to IEC 60071-2 in range I can also be applied. To compile with IEC 60071-2 for calculations the insulation levels and clearances, the iteration process accounting for BSL is not required. The clearances applying IEEE and IEC standards are closed and not significantly difference.
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