Motor Operated Disconnecting Swith Ice Tests at a Climatic Laboratory

As a result of full scale indoor operational ice tests performed in the Spring of 1973, it became apparent that high voltage air disconnecting switches built and tested under current ANSI standards will not perform satisfactorily when coated with 3/4 (1.9 cm) inch of ice and operated with a motor mechanism. It was also demonstrated that one motor operation both opening and closing under iced conditions is a piactical requirement and is within the design capabilities of most switch manufacturers.