三相对称交流电源采用Y形连接,线电压uAB与相电压uA的相位关系为(____)。
AuAB滞后uA30°$;$uAB超前uA30°$;$uAB
BuAB滞后uA30°$;$uAB超前uA30°$;$uAB
CuAB滞后uA30°$;$uAB超前uA30°$;$uAB
DuAB滞后uA30°$;$uAB超前uA30°$;$uAB
AuAB滞后uA30°$;$uAB超前uA30°$;$uAB
BuAB滞后uA30°$;$uAB超前uA30°$;$uAB
CuAB滞后uA30°$;$uAB超前uA30°$;$uAB
DuAB滞后uA30°$;$uAB超前uA30°$;$uAB