Device for monitoring a neutral and earth break and...

Details Device for monitoring a neutral and earth break and... Device for monitoring a neutral and earth break and...

2006-09-05

2006-09-05

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C361S042000

Reexamination Certificate

active

07103486

ABSTRACT:
The monitoring device of a neutral conductor and earth conductor comprises processing means, and first voltage detection means to supply a first signal representative of a voltage between neutral and earth to said processing means. The device also comprises second voltage detection means to supply a second signal representative of a voltage between phase and earth to said processing means, and third voltage detection means to supply a third signal representative of a voltage between phase and neutral to said processing means. The processing means supply a loss neutral of signal and/or a loss of earth signal according to the values of the first, second and third signal. The electrical switchgear apparatus comprises such a monitoring device to trigger opening of main contacts.

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