Title: Protective device for capacitor bank

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Claims: What is claimed is:

1. A protective device for a capacitor bank comprising two parallel capacitor sub-banks, each consisting of capacitor units, which protective device comprises at least one cross-connection means connected between equipotential points in the two sub-banks, characterized in that sensing means is connected to said cross-connection for sensing current surges in the cross-connection means resulting from one or more short-circuits in a capacitor unit, and counter means coupled to said sensing means for counting said current surges.

2. A protective device according to claim 1, characterized in that said sensing means sensing current surges consists of a transformer, with a secondary connected to said counting means.

3. A protective device according to claim 1, characterized in that the two capacitor sub-banks contain series-connected impedances connected to said cross-connection means including indicating means responsive to surge voltages.

4. Protective device according to claim 1, characterized in that said sensing means sensing current surges comprises a full wave rectifier.

5. A protective device according to claim 1, characterized in that the device also comprises stationary unbalance protection device coupled to said sensing means.

6. A protective device according to claim 1, characterized in that the device includes polarity-sensing means for distinquishing between current surges emanating from one or the other of said sub-banks.

7. A protective device according to claim 6, characterized in that said polarity-sensing means is connected to the capacitor voltage for providing power to the device.

Other info:

Inventors: Danfors, Per (Ludvika, SE)
Fahlen, Nils (Vesteras, SE)
Nerf, Owe (Farsta, SE)

Application Number: 882689
Filing Date: 1978-03-02
Publication_date: 1980-08-26
Assignee: ASEA Aktiebolag (Vesteras, SE)
Primary Class(es): 361/15 361/17, 361/111
Other Classes:
US Patent Ref:

2942153	Jun, 1960	Schultz et al.	361/17.
3143687	Aug, 1964	Hjertberg et al.	361/16.
3158783	Nov, 1964	Minder	361/17.
3181031	Apr, 1965	Yee	361/17.
3375341	Mar, 1968	Richards	361/72.
3499165	Mar, 1970	Madzarevic et al.	361/56.
3909672	Sep, 1975	Lundquist et al.	361/17.
3935512	Jan, 1976	Falk et al.	361/110.
4084204	Apr, 1978	Jacobu, Jr.	361/72.
4090226	May, 1978	Fahlen et al.	361/89.

Other Refs:
Primary Examiner: Salce, Patrick R.
Assistant Examiner:
Attorney: Pollock, Vande Sande & Priddy