Shunt arrangement with power overload protection by a voltage re

Details Shunt arrangement with power overload protection by a voltage re Shunt arrangement with power overload protection by a voltage re

1985-03-19

1987-04-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 343DIG1, H02H 904

Patent

active

046565540

ABSTRACT:
A shunt arrangement for processing the output current of an inductive current transformer having a wide dynamic range in which, in order to provide high-precision conversion with smaller currents, a power shunt is connected in series with a precision shunt which is connected in parallel with an overvoltage protection circuit containing a switchable semiconductor rectifier and a control circuit. The rectifier changes to a conductive state if the voltage at the precision shunt reaches a limit value. The control circuit contains a symmetric voltage limiting element which is constructed as a pair of limiting diodes or as a fullwave rectifier, the output of which is connected to a reference diode. In order to check the switching state of the overvoltage protection circuit, the series circuit including the power shunt and the precision shunt is connected in parallel with a series circuit consisting of a first bridge resistor and a second bridge resistor which, together with the shunts, form a balanced bridge circuit whereby, when the overvoltage protection circuit is inhibited, bridge circuit is monitored by a window discriminator.

REFERENCES:
patent: 2882494 (1959-04-01), Webster
patent: 3638114 (1972-01-01), Finley
patent: 4123934 (1978-11-01), Hoht
patent: 4158150 (1979-06-01), Dever
patent: 4322767 (1982-03-01), El Hamamsy et al.
patent: 4400755 (1983-08-01), Lezan
patent: 4424544 (1984-01-01), Chang et al.
patent: 4475139 (1984-10-01), Chadwick
patent: 4536816 (1985-09-01), Matsumura et al.
"Logic-Supply Crowbar", L. Strahan, Electrical Design New, Bank 16, #22, 15, Nov. 1971.

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