Correction procedure of the phase difference introduced by a zer

Details Correction procedure of the phase difference introduced by a zer Correction procedure of the phase difference introduced by a zer

1990-05-22

1991-11-19

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324510, 324521, 324523, G01R 3102

Patent

active

050669206

ABSTRACT:
A digital isolation monitor comprises a signal processor operating in conjunction with a measuring circuit to perform a first no-load measurement and a second load measurement of a zero sequence signal delivery by a toroid of a differential transformer, followed by synchronous demodulation, A microcontroller computes the tangent of the angle of phase difference introduced by the toroid by computing the relationship between the load and no-load components, and determines the true values of the leakage resistance and stray capacitance of the power system.

REFERENCES:
patent: 4857830 (1989-08-01), Matsuno
patent: 4857855 (1989-08-01), Matsuno
patent: 4896115 (1990-01-01), LeMaitre et al.
Patent Abstract of Japan, vol. 7, No. 241 (P-232) [1386] Oct. 26, 1983.
Patent Abstracts of Japan, vol. 12, No. 453 (P-792) [3300] Nov. 29, 1988.
Patent Abstracts of Japan, vol. 12, No. 492 (P-804) [3339] Dec. 22, 1988.

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