Method and apparatus for relieving a capacitor of a controlled s

Details Method and apparatus for relieving a capacitor of a controlled s Method and apparatus for relieving a capacitor of a controlled s

1993-05-18

1995-02-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Capacitor protection

361 15, H02H 716

Patent

active

053921844

ABSTRACT:
A method and an apparatus for relieving a capacitor of a controlled series compensator as a function of the load on its arrester when high-current line faults occur. The current flowing through the arrester is used to determine its absorbed energy, from which a temperature gradient is then determined as an indicator of a sudden load on the arrester and compared with a limit value. This comparison value is processed, as a function of the determined actual arrester temperature and the measured line current, to yield a control signal. The power converter valve of the controlled series compensator is triggered in response to this control signal in such a way that its equivalent impedance is switched from capacitative to inductive. The number of disconnections required as a result of high-current line faults is thereby considerably reduced, thus greatly increasing availability of the system.

REFERENCES:
patent: 4482930 (1984-11-01), Peterson et al.
patent: 4703385 (1987-10-01), Stenstrom
patent: 4999565 (1991-03-01), Nilsson
Thumm, G. et al., "Geregelte Parallel--und Reihenkompensation", Ekektrie, vol. 45, No. 3, Mar. 1991, Berlin, DE, pp. 88-90.
EPRI Workshop, Nov. 14-16, 1990, Cincinnati, Ohio, Siemens, Munich, Germany: Advanced Series Compensation with Variable Impedance, 13 pages.
Muller, Ing. Leonhard, "Reihenkondensatoren In Elektrischen Netzen" (Series Capacitors in Electric Networks), 1967, Chaper A, pp. 1-4.
IEEE Transactions on Power Delivery, vol. 4, No. 2 Apr. 1989, New York, US, pp. 1369-1378, M. Adolfson et al.: EHV Series Capacitor Banks. A New Approach To Platform to Ground Signalling Relay Protection and Supervision.

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