Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1988-02-23
1989-03-28
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 43, 361 58, 307326, 307327, H02H 908
Patent
active
048169560
ABSTRACT:
Stray voltage reduction apparatus for installation in an electrical power system to complete a path of electrical continuity between a primary neutral of a power distribution transformer and a grounding conductor at a service entrance, the primary neutral being also attached to a ground connection but nevertheless having a stray voltage relative to true earth which would appear on the grounding conductor at the service entrance if the primary neutral were directly connected to the grounding conductor at the service entrance. The stray voltage reduction apparatus includes a coil having turns wound around a core establishing a magnetic circuit for the coil. The core is made of a material having an initial permeability in excess of about 50,000 and being substantially saturated when the flux density is no more than about 10,000 gauss. The coil is wound around the core to have an impedance at 60 Hz. of at least approximately 750 ohms which falls in value when the volts-per-turn of the coil is not substantially less than an amount which substantially saturates the core, and reaches a value of less than an ohm when the volts-per-turn of the coil is greater than the amount which substantially saturates the core, the impedance substantially reducing the stray voltage at the grounding conductor at the service entrance. The stray voltage reduction apparatus can be combined with a power distribution transformer within or attached to the transformer tank.
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Hertz Claude M.
Ronk Leroy B.
Deboer Todd E.
Ronk Electrical Industries, Inc.
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