Arrangement for protecting telecommunications equipment from vol

Details Arrangement for protecting telecommunications equipment from vol Arrangement for protecting telecommunications equipment from vol

1994-08-17

1995-05-16

DeBoer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

High voltage dissipation

361111, 361113, H02H 904

Patent

active

054166632

ABSTRACT:
An arrangement for protecting an electrical circuit such as a telephone circuit from a voltage transient comprises a voltage clamp or foldback device (3) arraigned to be connected between a current-carrying line (1) and ground (1'), a capacitor (2) in series with it, and an inductance (4) series connected in the line. During normal operation the arrangement acts as an LC filter whose high frequency break-point is determined by the capacitance of the voltage clamp or foldback device (3) and the value of the inductance (4) which are chosen to give a break point of 1 kHz to 10 MHz. However, when the arrangement is subjected to a voltage transient, the voltage clamp or foldback device (3) fires causing the break-point to fall to a value determined by the values of the capacitor (2) and inductance (4). The arrangement may be used, for example, to protect the circuit against a rapid voltage drop caused by the firing of another circuit protection device such as a gas discharge tube 5.

REFERENCES:
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patent: 4021760 (1977-05-01), Campi
patent: 4095163 (1978-06-01), Montague
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British Search Report, 9021222.6, Nov. 26, 1990.
International Search Report, PCT GB91/01668, Jan. 2, 1992.

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