Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit automatically reconnected only after the fault is...
Patent
1975-12-29
1977-04-26
Moose, Harry
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit automatically reconnected only after the fault is...
313217, H02H 906
Patent
active
040203980
ABSTRACT:
Electrical equipment, such as telephone station apparatus, exposed to occasional, destructively high, voltage surges (e.g., lightning strikes) is protected by a device, placed in parallel with the equipment, including two electrodes defining a fixed narrow spark gap. Such a device is designed to spark over with each surge and to recover afterward, restoring the line to its original condition. The predominant failure mode of such devices is shorting across the narrow gap, due to electrode damage produced during the protective arcing mode. In the disclosed devices, the electrodes define a narrow region, determining the protective breakdown voltage, and a wider region, sustaining the major part of the electrode damage. Shortly after the initiation of the protective discharge in the narrow gap region, the discharge is forced into the wider gap region by the provision, in at least one of the electrodes, of a high resistance path at the narrow gap region. Since the major portion of electrode damage is sustained by the wider gap region of the electrodes, the incidence of shorting failure is suppressed.
REFERENCES:
patent: 1216538 (1917-02-01), Arco et al.
patent: 3454811 (1969-07-01), Scudner
patent: 3703665 (1972-11-01), Yereance et al.
patent: 3898533 (1975-08-01), Scudner
Bell Telephone Laboratories Incorporated
Friedman Allen N.
Moose Harry
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