Electrical transmission or interconnection systems – Personnel safety or limit control features
Patent
1992-05-26
1994-06-14
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Personnel safety or limit control features
361 42, 361 58, 307327, H02H 908
Patent
active
053213181
ABSTRACT:
A method and device neutralize alternating stray current flowing through a ground return circuit in the proximity of an animal susceptible to be affected by this current. The alternating stray current flowing through the ground return circuit is sensed and a signal representative of that stray current is produced. In response to this current representative signal, an alternating compensatory current is generated and injected in the ground return circuit. The alternating compensatory current has an amplitude equal to the amplitude of the sensed stray current and is out of phase with respect to that stray current by an angle of 180.degree.. Therefore, the alternating compensatory current and the alternating stray current add in the ground return circuit and substantially cancel each other whereby the stray current can no longer affect the animal. A plurality of different configurations for the connection of the stray current neutralizing device to the ground return circuit are described, each configuration being adapted to a specific application.
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