Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1975-11-25
1977-07-19
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
323 89R, H02H 316
Patent
active
040372650
ABSTRACT:
An improved electrical power supply system is disclosed for preventing arcing between two or more electrical machines energized by a common power source with at least one of said machines receiving power through a lengthy power cable, said cable having a grounding conductor connecting the external conductive housing of said machine to earth ground. A unique multi-winding transformer is connected between the common power source and the cable, so that arcing attributable to voltage induced in the cable grounding conductor is limited to non-dangerous current levels by an inductive impedance from a first winding of the multi-winding transformers, which winding in series with the cable grounding conductor. However, under short circuit conditions, another winding of the multi-winding transformer overcomes the inductive impedance of the first winding so that the current carrying capacity of the cable grounding conductor is no longer limited by the impedance of the first winding.
REFERENCES:
patent: 2228093 (1941-01-01), Sauer
patent: 3473091 (1969-10-01), Morris et al.
patent: 3855501 (1974-12-01), Agnew
Moose Jr. Harry E.
Pemco Corporation
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