Device for initiating the remote feed of electrical users

Details Device for initiating the remote feed of electrical users Device for initiating the remote feed of electrical users

1983-04-25

1985-03-26

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

307326, 340652, 324 62, H01H 3500

Patent

active

045075689

ABSTRACT:
For remote feed of a group of electrical users connected in series in a closed loop, a dc voltage is applied to the loop in a polarity opposite to a normal feed voltage in order to determine whether interruptions are present, even if a human body is shunting the loop at the interruption. Each of the users has a diode connected in parallel to its inputs which is polarized such that when the test voltage for creating a test current is applied, substantially only a resistance of the loop is measured exclusive of the users. A loop resistance is determined from a measurement of the test current and the loop resistance is compared to a test resistance set lower than a human body resistance. If the loop resistance is lower than the test resistance, then normal remote feed current is applied to the loop since no interruptions exist. If the loop resistance exclusive of the users is of a same magnitude or greater than the human body resistance, then shunt arms are employed in the loop comprised of resistors and diodes to lower the loop resistance during feed of test current so as to reliably detect whether an interrupt location is present.

REFERENCES:
patent: 3628099 (1971-12-01), Atkins
patent: 4066953 (1978-01-01), Gold
patent: 4362952 (1982-12-01), Ziegler

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