根据三相三线有功电能表的错误接线，见图所示，绘出其感性负载时的相量图并写出功率表达式。<br /> <img src="https://nimg.ppkao.com/2018-09/tangxueping/2018093009275040894.jpg?sign=76aec2233c4cf0f6ce7ba6a14237ed73&t=62d292d1" />