Short circuit limitation device in a low voltage system

1. A device for limiting short-circuit current in a consumer network having at least one supply line with a respective current feed point and operated with alternating current and low voltage, wherein electric energy having a medium voltage level is supplied to the customer network via current feed aggregates, the device comprising:

a disconnection point disposed in the at least one supply line so as to provide a first partial line and a second partial line in an event of a short-circuit fault, each of the first and second partial lines having a respective associated current detector and at least one of the first and second partial lines having at least one current feed aggregate;

a multiphase high-speed short circuiter disposed in the disconnection point and having a current carrying capacity for short-circuit current intensities in the at least one supply line; and

a respective power circuit breaker connected in series with the high-speed short circuiter toward each of the first and second partial lines, a switch-off time of the respective power circuit breaker being shorter than a switch-off time of an associated incoming switch,

wherein the respective associated current detector is configured, upon detection of a short circuit in one of the first and second partial lines, to transmit a triggering signal to the high-speed short circuiter so as to effect a short-circuit switching operation in the disconnection point.

2. The limiting device as recited in claim 1 , wherein the limiting device includes a plurality of high-speed short circuiters connected in parallel so as to provide a current carrying capacity for expected current intensities.

3. The limiting device as recited in claim 1 , wherein the at least one supply line includes at least one of a cable and a conductor bar.

4. The limiting device as recited in claim 1 , wherein the current feed aggregate includes a transformer.

5. The limiting device as recited in claim 1 , wherein the at least one supply line forms a stand-alone system.

6. The limiting device as recited in claim 1 , wherein the at least one supply line forms a ring system.

7. The limiting device as recited in claim 1 , wherein at least one generator is disposed in the at least one supply line.

8. The limiting device as recited in claim 1 , wherein the high-speed short circuiter is a one-time short circuiter.

9. The limiting device as recited in claim 8 , wherein the high-speed short circuiter includes a pyrotechnically operated short circuiter.

10. The limiting device as recited in claim 1 , wherein a detection threshold of at least one of the respective associated current detectors is adjustable.

11. The limiting device as recited in claim 10 , wherein the detection threshold is set at two times a rated current.

12. The limiting device as recited in claim 10 , wherein the detection threshold is set at four times a rated current.

13. The limiting device as recited in claim 11 , wherein at least one of the respective associated current detectors includes a current transformer.

14. The limiting device as recited in claim 1 , wherein at least one of the respective power circuit breakers is electronically actuatable and lockable so that it cannot be switched back on while the high-speed short circuiter is installed and in an activated condition.

15. The limiting device as recited in claim 1 , wherein the high-speed short circuiter is configured to connect phases of the at least one supply line to each other during the short-circuit switching operation.