Electrical transmission or interconnection systems – Personnel safety or limit control features
Patent
1983-08-08
1985-09-17
Pellinen, A. D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
340532, 340660, 340664, 324 64, 361 79, H02H 300, G01R 2714
Patent
active
045423024
ABSTRACT:
An apparatus for reducing the difference in electrical potential between two electrical conducting objects located a distance from each other in an electrical conducting medium includes an equalizing cable with a predetermined resistance valve detachably connected between the two objects. A current detector is coupled in series with the equalizing cable between the two objects and generates a first output voltage with a value dependent on the equalizing current in the equalizing cable. An instrument lead is also detachably connected between the objects. A voltage detector connected in series with the instrument lead between the objects senses the potential difference between the objects and generates a second output voltage having a value dependent on the sensed potential difference. A processing circuit receives the first and second output voltages and generates therefrom a third output voltage which is coupled to a decision circuit which generates an output signal representative of the deviation in electrical resistance between the objects along the equalizing cable and the predetermined resistance value of the equalizing cable.
REFERENCES:
patent: 4006319 (1977-02-01), Gartner
patent: 4209741 (1980-06-01), Coby et al.
Giovanni Mazza
Jennings Derek S.
Pellinen A. D.
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