Pumping station

Details Pumping station Pumping station

1993-02-04

1995-03-07

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 2, 361 58, H02J 340

Patent

active

053963938

ABSTRACT:
A 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, and a controller for ensuring 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.

REFERENCES:
patent: 3641357 (1972-02-01), Gratzmuller
patent: 3935509 (1976-01-01), Eidinger
patent: 4470091 (1984-09-01), Sun et al.
patent: 4733319 (1988-03-01), Yoshida et al.
patent: 5124872 (1992-06-01), Pham et al.
Electra, No. 94, May 1984, pp. 15-33, H. Kan "Problems Related to Cores of Transformers and Reactors".
Power Engineering, Jul. 1964, pp. 28-32, John Pett: "How to evaluate pumped storage for peaking generation".

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