三相三线电能表有功功率表达式()：
AP=UABIAcos(30°+φ)+UCBICcos(30°-φ)
BP=UABIAsin(30°+φ)+UCBICsin(30°-φ)
CP=UABIAtg(30°+φ)+UCBICtg(30°-φ)
DP=UABIActg(30°+φ)+UCBICctg(30°-φ)
AP=UABIAcos(30°+φ)+UCBICcos(30°-φ)
BP=UABIAsin(30°+φ)+UCBICsin(30°-φ)
CP=UABIAtg(30°+φ)+UCBICtg(30°-φ)
DP=UABIActg(30°+φ)+UCBICctg(30°-φ)