Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-07-29
1977-01-04
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3112
Patent
active
040016749
ABSTRACT:
A high voltage d-c cable is tested by first disconnecting the normally-grounded sheath of the cable from ground and providing insulation between the sheath and ground. The sheath is then biased to a predetermined bias voltage that is of an opposite polarity with respect to ground as the normal operating voltage of the cable conductor. The conductor is then energized with current and test voltage derived from its normal source. This test voltage is of the same polarity with respect to ground as the normal operating voltage of the cable conductor and of a magnitude approximating said normal operating voltage, whereby the difference between said test voltage and said bias voltage is applied to the cable insulation between the cable conductor and sheath.
REFERENCES:
patent: 2701336 (1955-02-01), Anderson
patent: 3364420 (1968-01-01), Kreuger
patent: 3373353 (1968-03-01), Harris
patent: 3421076 (1969-01-01), Eigen
patent: 3466537 (1969-09-01), Eigen
patent: 3821640 (1974-06-01), Bahder et al.
patent: 3909712 (1975-09-01), Rietz et al.
patent: 3919635 (1975-11-01), Bowen et al.
Freedman William
General Electric Company
Strecker Gerard R.
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