Apparatus for measuring the time constant of the direct-axis dam

Details Apparatus for measuring the time constant of the direct-axis dam Apparatus for measuring the time constant of the direct-axis dam

1991-10-15

1993-04-13

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324545, G01R 3134

Patent

active

052026205

ABSTRACT:
An apparatus for measuring the time constant of the direct-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 it keeps a constant value. A current induced on a direct-axis damper diminishes at a moderate rate of the direct-axis damper time constant, and this decreasing current and the constant armature current flow inside the synchronous machine. In response to a change in the induction current on the direct-axis damper caused by the transition of the armature current to the steady state, a voltage induced on the field winding rises sharply and then falls gradually. The time length until the field winding voltage falls to a prescribed level is measured as the time constant of the direct-axis damper with such a measuring device as an electromagnetic oscilloscope.

REFERENCES:
patent: 3651402 (1972-03-01), Leffmann
"Electrical Engineering Handbook" published by Institute of Electrical Engineers of Japan, Part 4.22, 1988.
"Institute of Electrical Engineers of Japan Technical Report," vol. 85, May 1968, .sctn..sctn.6.11-6.14 B.

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