Correction procedure of the phase difference introduced by a...

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

G - Physics

01

R

324/58.4

G01R 31/02 (2006.01) G01R 27/18 (2006.01) H02H 3/17 (2006.01)

Patent

CA 2016886

19 ABSTRACT CORRECTION PROCEDURE OF THE PHASE DIFFERENCE INTRODUCED BY A ZERO SEQUENCE MEASUREMENT TOROID OF A LEAKAGE CURRENT AND ISOLATION MONITOR IMPLEMENTING THIS PROCEDURE 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 delivered by a toroid of a differential transformer, followed by synchronous demodulation. A micro- controller 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.

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