描述
相位差是指两个同频率正弦量的相位(或初相位)之差。两个同频率正弦交流电的相位差与时间无关。所以,不同频率的两个正弦量,讨论它们间的相位差是没有意义的。
在分析交流电路时,常需要比较几个不同频率的正弦量之间的相位关系,此时,可任选一个正弦量的初相位零作参考正弦量,其它各量则可按与参考正弦量的相位差来确定其初相,但讨论过程中不可变更。
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