On-line test and diagnostic system for power system stabilizer

Details On-line test and diagnostic system for power system stabilizer On-line test and diagnostic system for power system stabilizer

1986-12-23

1988-04-26

Schreyer, Stafford D.

Telephonic communications

Telephone line or system combined with diverse electrical...

Remote indication over telephone line

322 99, 324158MG, G01R 3134, H02P 900

Patent

active

047410230

ABSTRACT:
A method and apparatus for performing a complete functional test of a power system stabilizer connected to the excitation system of an electrical power generator is disclosed. Two tests are performed, one an on-line modulation test, and the second a system response test. In the on-line modulation test, an internal 0.5 hertz sine wave is generated by a microprocessor which is applied as a frequency modulating input to the continuous wave frequency transducer included in the power system stabilizer. Such a signal acts to stimulate intertie mode oscillations and provide a means of determining the gain and phase shift characteristic of the power system stabilizer. In the second test, a voltage step type of signal is generated and applied to the output of the power system stabilizer where it is then coupled to the excitation system of the generator. This has the effect of stimulating local mode oscillations. The generator response to the local mode oscillation is sensed to determine system damping. Both tests are adapted to verify the operational status of the power system stabilizer and the adequacy of its adjustments. Furthermore, a local terminal and a telephone modem are connected to a communication port associated with the microprocessor for enabling the test to be initiated and the results evaluated either locally or remotely.

REFERENCES:
patent: 4463306 (1984-07-01), deMello et al.
patent: 4626622 (1986-12-01), Bouvrette

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