| 摘要 |
The invention relates to a protection and variable voltage sensing relay for ac monophase circuits, which is designed for supervising and protecting the circuits upon a voltage drop under a preset value, and which comprises a detecting circuits (2, 3, 4) for the amplitude variation of the monitored voltage, a sensing circuit (9, 10) for the minimum amplitude value, a detection and time-delay circuit (13, 14), a dividing circuit (15, 16), a buffer circuit (17, 18), a controll circuit (19, 20) switching in / out the monitored voltage at the circuit terminal
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