一种相序判定方法分析及其实用电路

Analysis of Unbalance Three-phase Circuit and a Practical Circuit for Judging Phase Sequence

三相交流电路中常需对相序进行判定,以便符合负载对于相序的要求。通过对不对称三相交流电路的分析,提出基于不对称三相电路原理的实用判定电路方案,用少量元件实现相序的准确判定,以LED显示结果并通过光电耦合器或微型继电器输出联锁信号。

Based on the analysis of the unbalance three-phase circuit,the basis of judging phases sequence was obtained, from which a practical circuit for judging phase sequence was derived.This circuit was applicable for the three-phase circuit under low voltage (AC380V).Whether the phase sequence was right could be indicated by LED.In addition,an exact judgment on phases sequence and a circuit interlock could be realized by the output signals of phase sequent-'right or wrong' from Optoelectronic Coupler or Relay.