In the case of the multiphase switching system (1), each (for example L.sub.3) of the phase conductors is arranged in the course of a generator output line (2), which is arranged between a generator (7) and a network transformer (8), together with a switching apparatus, in encapsulation (5) which is insulated by air gaps, in a manner isolated from the other phase conductors. The switching system is intended to allow virtually all the switching, protection, and measurement functions occurring in a generator arrangement to be executed despite a compact and space-saving construction. This is achieved by the switching apparatus (three-position interrupter switch 10) having at least two switching positions. A first of these two switching positions is arranged between the generator (7) and an output of the switching system (1) which acts on the network transformer (8). A second of these two switching positions is in contrast located between the generator (7) and a current connection (20) of a starting device (21) which is located outside the encapsulation (for example 5) and acts on the generator (7) when the first switching position is open and the second switching position is closed. In the case of a generator arrangement which is equipped with such a switching system (1) a load interrupter switch or interrupter switch, which is used for the current connection of the starting device (21) to the generator (7), can be saved.
The switchgear comprises a circuit breaker connected between a generator and a transformer, together with a disconnector connected between the circuit breaker and the transformer, the disconnector having a fixed pole common to three positions: a first position and a second position respectively for connecting together or isolating the transformer and the circuit breaker when the circuit breaker is respectively closed or open; and a third position for grounding the fixed pole when the circuit breaker is open. The fixed pole of the disconnector is electrically connected to the transformer, thereby making it possible to interconnect or to isolate or to ground the tranformer while using only one disconnector included in the switchgear.
A switching system having a plurality of positions for separating or interconnecting a generator, a network transformer, and a starter device, the system including a circuit breaker for the generator and a busbar disconnector for separating or interconnecting the generator and the network transformer, and a starter disconnector for separating or interconnecting the generator and the starter device. The busbar disconnector includes a first fixed contact and a first moving contact that co-operates by sliding with the first fixed contact, the first fixed contact and the first moving contact being integrated with the circuit breaker of the generator. The starter disconnector includes a second fixed contact and a second moving contact that co-operates with the second fixed contact by rotation. This organization remains economical to implement even for applications in which the generator is an alternator in a combined cycle or a gas turbine power station.
