Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1982-09-27
1984-05-15
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361119, 361111, 179170R, 330207P, H02H 904, H02H 320, H02H 720
Patent
active
044491573
ABSTRACT:
Secondary surge protection means for equipment connected to transmission lines, for example line-powered amplifiers interconnecting T1 or T1C telephone lines, includes two diode bridges and a pair of surge diverters. One diode bridge has its cathode/anode nodes connected one to each conductor of an incoming transmission line. The other diode bridge is connected in like manner to an outgoing transmission line. Each surge diverter interconnects the anode/anode node of one bridge and the cathode/cathode node of the other bridge. When a surge on one line causes the voltage across one or other diverter to exceed a predetermined threshold, the diverter conducts, shunting the surge past the amplifier to dissipate in the other line. The two transmission lines may be coupled to the input and output, respectively, of one amplifier, or to the input of one amplifier and the output of a different, oppositely connected amplifier. In both cases, power for the or each amplifier may be derived from the two lines, for example by a Zener diode interconnecting them in known manner. The characteristics of each surge diverter are such that it will respond to fast rise-time lightning pulses yet tolerate long duration power surges, and will be operated by differential mode or common mode surges.
REFERENCES:
patent: 3633093 (1972-01-01), Templeton, Jr. et al.
patent: 4066918 (1978-01-01), Heuner et al.
patent: 4110570 (1978-08-01), Foster
patent: 4161008 (1979-07-01), Zimmermann et al.
patent: 4389695 (1983-06-01), Carpenter, Jr.
Jelly Sidney T.
Northern Telecom Limited
Salce Patrick R.
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