Electric switchgear equipment with detection of unauthorized cha

Details Electric switchgear equipment with detection of unauthorized cha Electric switchgear equipment with detection of unauthorized cha

1991-07-19

1993-03-23

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 335 17, G08B 2100

Patent

active

051968312

ABSTRACT:
Low voltage electric switchgear equipment includes a central processor unit electrically interconnected with electronic main and branch circuit interrupters within the same enclosure and used within a multi-phase power distribution circuit. A terminal connector block is connected by cable with each of the electronic trip units within the branch circuit interrupters to provide communications between the branch circuit interrupters and the main circuit interrupter for continuously updating the status of the branch circuit interrupters and their associated electrical equipment. An operating program within the central processor unit determines whether unauthorized changes to the setpoints stored within individual branch circuit interrupters have occurred and immediately provides indication of such changes.

REFERENCES:
patent: 4468714 (1984-08-01), Russell
patent: 4583232 (1986-04-01), Howell
patent: 4672501 (1987-06-01), Bilac et al.
patent: 4991042 (1991-02-01), Tokarski et al.

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