Richard Huber, P. Eng.
Richard Huber Engineering, Ltd.
North Vancouver, BC
Canada
Technical Services Committee Member
Introduction
Recently I worked on new air-cooled machines rated at 13.8 kV that generated large quantities of ozone and had very high partial discharge levels. The basic problem with the windings in these machines was incorrect spacing of the end turns and the main leads. There was also a lack of space between the series and group connections in the windings.
Spacing requirements
The spacing suggested here is a guide only and original equipment manufacturers (OEMs) and service centers may have their own guide for such values. It should be noted, however, that if spacing is much reduced from that suggested here, there is a real risk that partial discharge activity will develop in the winding.
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ANSI/EASA AR100
More information on this topic can be found in ANSI/EASA AR100
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