(FR2687192-A1)      The pumping station either supplies hydraulic energy to the electric network (R), or raises water from a low level to a high level. The station includes a transformer (THT/MT) linking an alternator and the network with a circuit breaker (DTHT) in between. The circuit breaker includes a device to limit the current in the transformer.    A resistance (RS) of 500 to 100,000 ohms inserted at the opening of the circuit breaker for a time between 15 and 19 milliseconds. A further device (MY) ensures that the circuit breaker is not closed on to the transformer except in time intervals specified w.r.t. the max. voltage occurrence on the network.    ADVANTAGE -   Controls extend life of components, avoiding excessive transient currents in transformer.    (FR2694603-A1)      The pumping station either supplies hydraulic energy to the electric network (R), or raises water from a low level to a high level. The station includes a transformer (THT/MT) linking an alternator and the network with a circuit breaker (DTHT) in between. The circuit breaker includes a device to limit the current in the transformer.    A resistance (RS) of 500 to 100,000 ohms inserted at the opening of the circuit breaker for a time between 15 and 19 milliseconds. A further device (MY) ensures that the circuit breaker is not closed on to the transformer except in time intervals specified w.r.t. the max. voltage occurrence on the network.    ADVANTAGE -   Controls extend life of components, avoiding excessive transient currents in transformer.    t    (FR2699231-A1)      The pumping station either supplies hydraulic energy to the electric network (R), or raises water from a low level to a high level. The station includes a transformer (THT/MT) linking an alternator and the network with a circuit breaker (DTHT) in between. The circuit breaker includes a device to limit the current in the transformer.    A resistance (RS) of 500 to 100,000 ohms inserted at the opening of the circuit breaker for a time between 15 and 19 milliseconds. A further device (MY) ensures that the circuit breaker is not closed on to the transformer except in time intervals specified w.r.t. the max. voltage occurrence on the network.    ADVANTAGE -   Controls extend life of components, avoiding excessive transient currents in transformer.    t    (US5396393-A)      The pumping station feeds hydraulic energy to a grid or raises water from a low level to a high level. It includes, in particular, a transformer connected between an alternator and a grid, with a circuit breaker between the transformer and the grid. It further includes resistance for limiting the surge current through the transformer. This resistance lies in the range of 500 ohms to 100,000 ohms and is inserted for a period lying in the range 15 milliseconds to 19 milliseconds when the circuit breaker is closed.    A controller ensures that the circuit breaker closes on the unloaded transformer only at an instant that is no more than 1.2 milliseconds from an extreme value in the grid voltage.    ADVANTAGE -   Limits surge current in its transformer at moment it is engaged.