Method for limiting the fault-generated currents of circuit brea

Details Method for limiting the fault-generated currents of circuit brea Method for limiting the fault-generated currents of circuit brea

1983-05-04

1986-03-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

307 19, 307112, H02B 124

Patent

active

045772533

ABSTRACT:
In a high-voltage switching system, nodes (1, 2, . . . , 8) are connected in the form of a ring via switching points (12, 23, . . . , ) which in each case contain a circuit breaker. In this system, the breaking currents of the circuit breakers are to be limited and thus the breaking capacity of the circuit breakers provided in the system is to be reduced if a short-circuited part (for example node 1) is separated from a faultless part of the system. This is achieved by opening a switching point (for example 45) of the nodes connected in the form of a ring, between the contact feeders of which switching point and the non-available node (for example (1) in each case at least one available node (for example 2, 3, 4, 5, 6, 7, 8) is provided, via which a component short circuit is fed into the ring. It is of particular advantage in this case to open that switching point (for example 45) which divides the short circuit current flowing towards the short-circuited part (for example node 1 ) into two approximately equal halves, since then the maximum breaking current in the power-switching points (for example 12, 18) only needs to be half the maximum short circuit current of the high-voltage system.

REFERENCES:
patent: 4467220 (1984-08-01), Page
patent: 4467221 (1984-08-01), Koppl
Appolt, Oeding, Electric Power Stations and Systems, Springer Verlag Press 1978, pp. 450-454.

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