Safety circuit for a detachable connecting cable

Details Safety circuit for a detachable connecting cable Safety circuit for a detachable connecting cable

1983-05-31

1985-06-11

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

361 47, 361 49, 315241P, 3541451, H02H 320

Patent

active

045232482

ABSTRACT:
A power supply system comprising an a.c. voltage source (ACS), a load (LL) and a detachable (DCC) cable connection (CC). In order to prevent a dangerously high a.c. voltage from occurring between cable conductors (CC1, CC2) when the cable connection is loose, a safety circuit (CITSR) is provided which includes an on/off switching circuit (S1, SR1, S2, SR2). The safety circuit (CITSR) includes a parallel arrangement (CI) of at least one capacitor (C) and a direct current source (I). The parallel arrangement (CI) is part of a direct current circuit (CC2, DC2, CC1, S1, DC1, CC2) which is closed via the cable conductors (CC1, CC2), the a.c. voltage source (ACS) and the load (LL). The parallel arrangement (CI) is coupled to the on/off switching circuit (S1, SR1, S2, SR2) via a threshold circuit (TC). When a controllable a.c. voltage source (ACS) is used to produce a low voltage (30 V) before a high voltage (700 V) is supplied, it is first detected whether there is a high-ohmic load or a short-circuit between the cable conductors.

REFERENCES:
patent: 3697809 (1972-10-01), Self
patent: 4204140 (1980-05-01), Willis
patent: 4369395 (1983-01-01), Stempeck
patent: 4410925 (1983-10-01), Tucker et al.

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