Dr. Chisholm is an expert in the effects of adverse weather on overhead power lines, including lightning and grounding, icing on insulators and thermal rating. He has been an IEEE Fellow for a decade – a distinction given after his long career at Ontario Hydro and Kinectrics. He combines his consulting worldwide with teaching and writing for INMR as well as Wiley & McGraw Hill and also volunteers in the IEEE executive rotation as Chair and Past Chair of the PES T&D Committee. In 2017, he received the Claude de Tourreil Memorial Award for Lifetime Achievement in the Field of Electrical Insulators.
2. Special considerations can affect application of insulators, surge arresters, bushings and live-line tools under ‘cold weather conditions’, i.e. < 0°C, when contamination can accumulate for months. Moreover ice, rime and snow can accrete on insulators and bridge their normal leakage distance. Frost can stabilize pollution during melting, acting as a heavy non-soluble deposit. This presentation describes consolidated worldwide failure experience during cold weather. Suitable testing procedures are identified and a review provided of guidance offered in IEEE Standard 1820TM, “Guide on the Selection of Transmission and Distribution Insulators with Respect to Cold Weather Conditions”.