Protective relay apparatus

Details Protective relay apparatus Protective relay apparatus

1978-11-08

1980-08-19

Miller, J. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 83, H02H 338

Patent

active

042187184

ABSTRACT:
Protective relay apparatus for developing signals responsive to subsynchronous current oscillations in a three-phase electrical power system, and for analyzing the signals to determine when corrective action is necessary. The positive sequence component of a subsynchronous current oscillation is developed via a summing arrangement, which eliminates the need for sequence filters. The positive sequence component of a subsynchronous current oscillation is processed to determine if it is an electrical transient which would shock the mechanical system of a turbine generator, or machine, to be protected, into mechanical resonance. It is also processed to determine if it is due to a growing mechanical oscillation of a turbine generator, such as might be initiated by a change in a parameter related to the turbine generator.

REFERENCES:
patent: 3944846 (1976-03-01), Thompson et al.
patent: 4106071 (1978-08-01), Sun et al.
patent: 4125884 (1978-11-01), Sun

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