Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1985-04-29
1988-07-19
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324140D, 324142, G01R 3102
Patent
active
047587741
ABSTRACT:
A portable tester for determining the primary winding to secondary winding current ratio of a current transformer while that transformer is in service, including a current probe having a split core positionable around an active power line supplying current to the transformer, an AC to DC converter to convert the AC output of that probe to a first DC signal, another AC to DC converter for converting the secondary output of the current transformer under test to a second DC signal, and a ratio meter for converting the first and second DC signal into a visual display of the ratio of those signals. A mechanism is provided for assuring proper location of the decimal point on the ratio meter. Polarity and burden testing is also provided.
REFERENCES:
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patent: 3958178 (1976-05-01), Mueller et al.
patent: 4241306 (1980-12-01), Bump
patent: 4439724 (1984-03-01), Morong, III
patent: 4490671 (1984-12-01), Morong, III
Dranetz Model 325 Electronic Solid-State Portable Digital Power-System Polymeter, 2-1981, pp. 1-8.
Crawford Tullus E.
Riley, Jr. Claude R.
Eisenzopf Reinhard J.
Harvey Jack B.
Special Instruments Laboratory, Incorporated
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