Fault indicator with timing control

Details Fault indicator with timing control Fault indicator with timing control

1989-11-27

1992-05-05

Stephan, Steven L.

Communications: electrical

Condition responsive indicating system

Specific condition

324133, H02H 700, G08B 2100

Patent

active

051111896

ABSTRACT:
In the disclosed fault indicator a sensing device is arranged for location in the magnetic field surrounding a conductor, an electronic device responsive to the sensing device assumes a first state in response to the sensing device sensing a trip condition and remains in the first state until set to a second state, a signaling device coupled to the electronic device serves for generating a signal only in response to the electronic device being in the first state, and a timing device responsive to the electronic device assumes the first state serves for setting the electronic device to the second state after a predetermined period. The sensing device is an inductive sensor, preferably a coil with an axis transverse to the conductor. In one embodiment an inrush restraint circuit renders the electronic device insensitive to inrush currents.

REFERENCES:
patent: 2709800 (1955-05-01), Temple et al.
patent: 3493839 (1970-02-01), De Puy
patent: 3641548 (1972-02-01), Groce
patent: 4153924 (1987-10-01), Moran
patent: 4231372 (1980-11-01), Newton
patent: 4346307 (1982-08-01), Zulaski
patent: 4754162 (1988-06-01), Kondou et al.
patent: 4797661 (1989-01-01), Wiley
patent: 5003426 (1991-03-01), Yeh et al.

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