Apparatus for measuring the electrical time constant of the quad

Details Apparatus for measuring the electrical time constant of the quad Apparatus for measuring the electrical time constant of the quad

1993-07-01

1994-05-10

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324545, G01R 3134

Patent

active

053111214

ABSTRACT:
An apparatus for measuring the electrical time constant of the quadrature-axis damper of a synchronous machine is designed such that a voltage from a d.c. power source is applied by switching to armature windings of two. phases, so that an armature current rises and thereafter maintains a constant value. A current induced on a quadrature-axis damper diminishes at a rate determined by the quadrature-axis damper time constant, and this decreasing current and the constant armature current flow inside the synchronous machine to produce a constant resistance drop by resistance of the armature windings and the armature current. In this time, the length of time length until the voltage waveform falls to a prescribed level is measured as the time constant of the quadrature-axis damper with such a measuring device as an electromagnetic oscilloscope.

REFERENCES:
patent: 3651402 (1972-03-01), Leffmann
patent: 4293923 (1981-10-01), Jasmin et al.
patent: 4593240 (1986-06-01), Blaschke
patent: 4739256 (1988-04-01), Fetcher et al.
patent: 4920306 (1990-04-01), Mard et al.
patent: 5202620 (1993-04-01), Kawamura
Lohmeier; "Measurement of Motor Time Constant"; IBM Technical Disclosure Bulletin; vol. 14, No. 6; Nov. 1971.

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