Surge counter for an overvoltage arrester

Details Surge counter for an overvoltage arrester Surge counter for an overvoltage arrester

1987-03-18

1989-01-03

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Counting animate or inanimate entities

377 12, 361 86, 361 91, 307130, H02H 304, H02H 904, G06M 300

Patent

active

047962836

ABSTRACT:
A device for counting the overvoltage surges discharged by a gapless overvoltage arrester contains a sensing head and a counting mechanism which follows the sensing head. In the sensing head, the discharge current carried by the overvoltage arrester in a ground return line during the occurrence of an overvoltage surge is detected. The counting mechanism records an overvoltage surge as soon as the discharge current exceeds a threshold value. During this process, an effective connection between the sensing head and a counter is established for a brief time by means of a switch. This device is intended to be characterized, with a high counting accuracy, by a dead time which is independent of the components used. This is achieved by the measure that the switch is followed by a threshold detector which responds above the threshold value of the discharge current. This threshold detector acts both on the counter and on a control member, such as a monostable multivibrator, which switches the switch off after the threshold detector has responded and holds it in the switched-off position during a predetermined period which is essentially determined by the duration of the overvoltage surge.

REFERENCES:
patent: 4605981 (1986-08-01), Huvet et al.
patent: 4628396 (1986-12-01), Flemming
Breder et al., "Supervision of Gapless Zinc-Oxide Surge Arresters" Conference on Lightning+Power Systems, London, 1984 (Conference Publision No. 236, IEE).

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