:U相电流接反的计量为
P1 =UUVIUcos(150°—φ)
P2 =UWVIWcos(30°—φ)
P =P1+P2
=UUVIUcos(150°—φ)+UWVIWcos(30°—φ)
=UIcosφ
正确接线计量应为
P1 =UUVIVcos(30°+φ)
P2 =UWVIWcos(30°—φ)
P =P1+P2
=UUVIUcos(30°+φ)+UWVIWcos(30°—φ)
=㊣3UIcosφ
更正率 K = 错误计量
正确计量 —1=tan ㊣3φ—1