PROCESS FOR LIMITING THE OPENING CURRENTS OF THE CIRCUIT BREAKERS IN A HIGH-VOLTAGE SWITCHGEAR, AND APPLICATION OF THE PROCESS

摘要

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.