The CP relay is a three-phase contact-making voltmeter which is used to detect reverse phase connections of lines, transformers, motors, generators, or synchronous condensers.
The CP relay is a three-phase contact-making voltmeter which is used to detect reverse phase connections of lines, transformers, motors, generators, or synchronous condensers. It is commonly used in automatic transfer schemes to assure connection of proper phase rotation. For example, one CP relay is used to initiate trip of a source breaker, while another is used to supervise closing of the alternate source breaker.
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