This paper describes the operation principle of a simple phase sequence relay, its parameter calculating method, and the correlative relationship and optimization problem on element parameters.
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高/低压力开关保护、排气过高保护、热熔赛、压缩机热保护器，过流继电器、相序/缺相保护器等。
High / low pressure switch protection, protection, hot melt season, high exhaust heat protector for a compressor, overcurrent relay, phase sequence protector.
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