Japanese Patent JPH0461576

B2

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.

PETERU KURISUTEIAN SHUMAARE
MARINUSU KORUNERISU UIREMU FUAN BUURU

JP9705883A

October 01, 1992

June 02, 1983

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FUIRITSUPUSU FURUUIRANPENFUABURIKEN NV

H02J3/00; H02H3/00; H02H3/05; H02H3/12; H02H11/00; H02H1/00

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