| 摘要 |
A MEASURING DEVICE FOR AN ELECTRICAL INSTALLATION IS SUPPLIED WITH AN AC SUPPLY VIA A NEUTRAL CONDUCTOR 3 AND AT LEAST ONE LIVE CONDUCTOR 2. THE DEVICE COMPRISES A TOROIDAL TRANSFORMER DETECTOR 1, 4 FOR GENERATING A RESIDUAL CURRENT SIGNAL IN RESPONSE TO A DETECTED RESIDUAL CURRENT IN THE ELECTRICAL INSTALLATION. ASHUNT RESISTOR DETECTOR 6A-6D IS OPERATIVE FOR GENERATING RESPECTIVE CURRENT SIGNALS INDICATIVE OF CURRENT DETECTED IN THE NEUTRAL CONDUCTOR 3 AND EACH OF THE AT LEST ONE LIVE CONDUCTORS 2. A PROCESSOR MEANS 13 FOR GENERATING A TRIP SIGNAL INDICATIVE OF THE PRESENCE OF A RESIDUAL CURRENT FAULT IN DEPENDENCE ON THE RESIDUAL CURRENT SIGNAL AND / OR THE RESPECTIVE CURRENT SIGNALS DETECTED IS ALSO PROVIDED. THE DEVICE MAY FURTHER COMPRISE A CIRCUIT BREAKER 15, 16 OPERATIVE TO BREAK THE AC SUPPLY IN RESPONSE TO THE TRIP SIGNAL.
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