Method and apparatus for determining negative sequence current i

Details Method and apparatus for determining negative sequence current i Method and apparatus for determining negative sequence current i

1977-11-07

1979-05-22

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Polyphase

324 86, 361 76, G01R 2916, G01R 2500, H02H 328

Patent

active

041561864

ABSTRACT:
A method and apparatus are disclosed for accurately determining negative sequence current in a three-phase turbine-driven generator, the currents indicative of power oscillations and of torques harmful to turbine buckets. A signal conditioner and phase-shifter network are described which provide precise amplitude and phase angle adjustments and null balancing features which permit accurate determination of the magnitude of negative sequence current even though this current is a very small quantity determined as the difference between two large signals.

REFERENCES:
patent: 2897407 (1959-07-01), Morris
patent: 3154737 (1964-10-01), Hodges

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