| 摘要 |
The protective system uses a summation transformer (W) which has the protected circuit (L,N) as primary winding (1) and two secondary windings (2,3). A microprocessor (P) monitors the summation transformer (W) and if a leakage is detected sends different but related signals (S1,S2) to switching circuits which become conducting and energise operating windings (L1,L2) in an electronic circuit breaker (H) to isolate any fault
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