| 摘要 |
1. A device for protection against electrical faults comprising: - measuring means (5) for measuring a fault current, - processing means (4) connected to the measuring means, - an actuator (3) connected to the processing means and to a power supply line (7) to bring about opening of electrical contacts (1), and - means (8) for limiting voltage surges connected to the actuator, the device characterized in that the actuator comprises: - a first winding (10, l0a, l0b) connected between the power supply line and a common output (11) connected to the means (8) for limiting voltage surges, and - a second winding (12) connected between the common output (11) and the processing means (4). 2. The device according to Claim 1 characterized in that the first winding (10) is achieved in two parts (l0a, l0b) separated by an insulating shield (13). 3. The device according to one of the Claims 1 or 2 characterized in that the actuator comprises a mobile magnetic core (9) located essentially in the first winding (10, l0a, l0b) when the actuator is in the inactive position. 4. The device according to any one of the Claims 1 to 3 characterized in that the first (10) and second (12) winding have appreciably the same number of turns. 5. The device according to any one of the Claims 1 to 4 characterized in that the first and second winding have a number of turns equal to or less than 700. 6. The device according to any one of the Claims 1 to 5 characterized in that the processing means (4) comprise a component (16) which switches to the open position when the current flowing through this component is nil, and triggering means (14) supplying a control signal without storage after a fault to trigger turn-on of said component, the actuator being connected to an AC power supply line (7). 7. The device according to Claim 6 characterized in that the actuator (3) can be connected to a power supply line (7) either up-line or down-line from the electrical contacts (1). 8. The device according to any one of the Claims 1 to 7 characterized in that the processing unit comprises means (14, 5, 16) for tripping on a differential fault current. 9. The device according to any one of the Claims 1 to 8 characterized in that the processing unit comprises means (19, 20-25) for tripping according to the voltage of the power supply line (7). 10. The device according to Claim 9 characterized in that the means (19) for tripping according to the voltage of the power supply line comprise a mechanical indicator controlled by a relay (20) connected to a winding of the actuator. |
