Short-circuit indicator for electrical lines for power...

Details Short-circuit indicator for electrical lines for power... Short-circuit indicator for electrical lines for power...

2008-06-23

2010-02-16

Enad, Elvin G (Department: 2832)

Inductor devices

With condition-responsive inductance adjusting means

C336S174000, C336S176000, C324S127000

Reexamination Certificate

active

07663459

ABSTRACT:
A short-circuit indicator is provided for arrangement on an electrical line for electrical power distribution which includes a current transformer. The current transformer has an induction coil and an iron yoke for surrounding the electrical line to be monitored for a short-circuit current. The induction coil is seated on a base web of a U-shaped first yoke part. A second yoke part is connected in the form of a joint which can move between a closed position and an open position to one of two U-limbs of the first yoke part. The second yoke part forms a magnetic return path element for the first yoke part in the closed position. The first yoke part is split into two essentially L-shaped parts in the area of the base web to which the induction coil is fitted.

REFERENCES:
patent: 4456873 (1984-06-01), Schweitzer, Jr.
patent: 4513273 (1985-04-01), Friedl
patent: 5180972 (1993-01-01), Schweitzer, Jr.
patent: 5483215 (1996-01-01), Mies
patent: 5729125 (1998-03-01), Schweitzer, Jr.
patent: 6963197 (2005-11-01), Feight et al.

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