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This paper describes the various test methods which have been evolved during three years by The Tennessee Electric Power Company, which pioneered the use of reactance type distance relays in this country. Specific examples with diagrams are given. New considerations brought about by the use of high speed distance relays are discussed, including their adaptability to being tested by means of short circuit tests. General notes and recommendations covering short circuit tests arising from eight years' experience in making them are given together with typical examples.