Vosloo, Wallace

Corporate Specialist High Voltage Engineering, Eskom, South Africa

Vosloo, Wallace

Corporate Specialist High Voltage Engineering, Eskom, South Africa

Biography

Utility Perspective on Outdoor Insulator Selection for Polluted Environments

Dr. Vosloo is a distinguished international expert in the field of electrical insulation. Over a career spanning decades at one of the world’s largest power utiliies, he has presented many training courses in the field and also authored over 100 papers on high voltage insulators. His published texts include: “The Practical Guide to Outdoor High Voltage Insulators”, co-authored by Roy Macey and Dr. Claude de Tourreil, and “High Voltage Engineering Practice and Theory” along with Dr. Holtzhausen. He is recipient of the SAIEE President’s Award for contribution to development of high voltage insulator research, investigation capabilities and standards in South Africa as well as the Claude de Tourreil Memorial Award for Lifetime Achievement in Field of Electrical Insulation. Dr. Vosloo is active in several national and international working groups.

Selecting porcelain/glass insulators for three-phase AC systems up to 525 kV phase-to-phase using IEC/TR 60815 has been based on service experience and laboratory tests under polluted conditions. But many utilities have simply standardized on one or more of the values of minimum Specific Creepage Distance for Light, Medium, Heavy and Very Heavy polluted environments. The focus of this presentation is to show how the old technical recommendation, i.e., IEC/TR 60815 and the new technical specification i.e. IEC/TS 60815 are being used by a large power utility when selecting outdoor insulators for application in polluted areas. Emphasis is placed on approaches based on measuring ESDD as well as using data collected from directional dust deposit gauges.

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