One phase or all three phases is opened (the critical value of phase failure is 100V).
One phase or all three phases is opened (the critical value of phase failure is 100V).
三相或任何一相全部丢失（相对丢失的临界值100V）。
One phase or all three phases is opened (the critical value of phase failure is 100V).
三相或任何一相全部丢失（相对丢失的临界值100V）。