Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1986-12-16
1988-02-16
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With phase sequence network analyzer
361 64, 361 81, 361 87, H02H 338
Patent
active
047259140
ABSTRACT:
Apparatus for performing selective-pole trip determination is included in each protective relay of a current only monitoring protective relay system for protecting an electrical transmission segment of a power system network against faults. Current signals from the phases of the transmission segment are provided to a sequence network of the apparatus for conversion into positive and negative sequence component signals for each phase. A zero sequence component signal is also derived. A logic circuit is provided for each of the phases of the transmission segment and is governed by the corresponding sequence component signals and phase shifted variations thereof to detect a single-pole fault exclusively in the corresponding phase and generate a signal in response to the detection. An internal trip detection enables each phase logic circuit to generate its corresponding trip signal. Each protective relay further includes multi-phase trip logic circuitry governed by the positive, negative and zero sequence component signals and phase shifted variations thereof to generate phase-to-phase and phase-to-phase-to-ground fault signals.
REFERENCES:
patent: 4146913 (1979-03-01), Sun
patent: 4275429 (1981-06-01), Church et al.
patent: 4398232 (1983-08-01), Elmore
patent: 4438475 (1984-03-01), Haley
patent: 4536815 (1985-08-01), Li et al.
patent: 4538195 (1985-08-01), Elmore
patent: 4538196 (1985-08-01), Sun et al.
W. L. Hinman et al., "A New Relaying System to Protect Series Compensated Lines", May 3-4, 1983, Presented to GIT Protective Relaying Conference.
Jennings Derek S.
Pellinen A. D.
Telfer G. H.
Westinghouse Electric Corp.
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