Protective system for portable electrically powered apparatus

Details Protective system for portable electrically powered apparatus Protective system for portable electrically powered apparatus

1988-09-30

1990-09-04

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

307326, H02H 504

Patent

active

049549227

ABSTRACT:
In an electrically powered apparatus, particularly a portable apparatus, having a flexible shielded main connection line (50) and an electronic protective device, said protective device is housed in the main connection plug (60) or in an adapter (61) to which the main connection line (50) can be coupled, wherewith said protective device serves as a safety device in the event of leakage of fluid into the apparatus or of current to ground or to protect the user. In order to provide intrinsic protection against damage or defects which may render the protective device itself ineffective, a holding current loop is provided which extends to the protected apparatus (30) via core conductors (21, 23) and shielding (22) of the main connection line, which holding current loop preferably also includes a probe (40, 41) in the protected apparatus, wherewith, when, regardless of the operating state of the protected apparatus (30), the holding current in the holding current loop falls below a lower limit or increases above an upper limit (depending on the type of failure event), the protective device (5-20) is triggered. Means are provided to prevent accidental or willful interposition of an inventive adapter (61) with an older consuming apparatus of a non-inventive unprotected type, and to prevent false triggering of the protective device.

REFERENCES:
patent: 4464582 (1984-08-01), Aragaki et al.
patent: 4589047 (1986-05-01), Gous et al.
patent: 4709293 (1987-11-01), Gershen et al.

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