Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1980-03-17
1982-05-25
Gellner, Michael L.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
361111, 361113, 324 78F, H02H 708
Patent
active
043318827
ABSTRACT:
Spurious subsynchronous and supersynchronous electrical signals in an electrical power system are detected rapidly and reliably by generating an electrical signal which is proportional to the power signal and rectifying the generated signal. The rectified signal includes a dc component and a component having a frequency equal to the difference of the contact power frequency and the spurious signal frequency. The component is readily identified by a tuned filter and detector whereby remedial action can be taken to eliminate the spurious signal.
REFERENCES:
patent: 3610029 (1971-10-01), Carlson
patent: 3731526 (1973-05-01), Games
patent: 3737842 (1973-06-01), Bobrin
patent: 3944846 (1976-03-01), Thompson et al.
patent: 3970897 (1976-07-01), Tamir et al.
patent: 4125884 (1978-11-01), Sun
Dwyer James L.
Electric Power Research Institute Inc.
Gellner Michael L.
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