Turbine-generator protection system with electronic sampling fil

Electricity: single generator systems – Driving means control

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Details

290 40R, 322 25, 361 20, H02H 706, H02P 904

Patent

active

041140842

ABSTRACT:
A system for protecting a turbine-generator power plant governed by signals representative of turbine mechanical power and generator electrical power to reduce at times the turbine mechanical power, with an electronic filter included therein for the purposes of filtering a periodic time varying component of the electrical power signal having a response time within adequate protective limits, is disclosed. More specifically, the electronic filter generates a train of fixed time durations wherein during each fixed time duration the maximum and minimum amplitudes of the electrical power signal are selected. A signal is sampled at the end of each fixed time duration and held constant for each next fixed time duration, said signal being representative of the average of the maximum and minimum amplitudes selected during each fixed time duration. In employing these sampled filter techniques, the electronic filer can respond to electrical power signal disturbances with a response time approximately equal to one fixed time duration while generating a sampled average signal of the electrical power signal free of the time varying component.

REFERENCES:
patent: 3167702 (1965-01-01), Schonung et al.
patent: 3718837 (1973-02-01), Yokota et al.
patent: 3836822 (1974-09-01), Schonfeld et al.
patent: 3849666 (1974-10-01), Park

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