Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1988-12-19
1989-09-05
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 81, 361 82, 361 84, 324107, 324522, 364483, H02H 328
Patent
active
048644536
ABSTRACT:
The invention comprises a protective relay with selective phase selection in electric power distribution systems when there are double transmission lines (M1-P1,M2-P2) between two stations (TM, TP) and where the ends of the line are connected to a common busbar system located in each station. The protective device includes a protection unit, terminal, at both ends of each line. All the terminals (M1, M2, P1, P2) include an identical basic design for measurement of phase quantities (17), filtering (18) and A/D conversion (19); furthermore, the identical part includes a parameter estimator (20) for Fourier series expansion of measured phase signals and generation of the respective residuals. The parameter estimator cooperates with a frequency estimator (21) and a sampling regulator (22). Each basic design also includes a local logic unit which, by transient and steady state analysis, finds out whether an event on the network is due to a fault or a connection/disconnection of the phase/line and the current direction at each terminal. At one of the terminals, at both stations, there is a station master unit (26) which compiles all information for the station in question, calculates the distance to a fault, etc. For final decisions as to whether a recorded fault lies between the stations, as to faulty line(s) and phase(s), all information from the two stations is compiled in a superordinate unit (29) in one of the terminals at one of the stations.
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"A New Computer Based Integrated Distance Relay for Parallel Transmission Lines", Phadke et al., IEEE Transaction on Power Apparatus and Systems, vol. 104, No. 2, Feb. 1985.
Bergman Sten
Ljung Stefan
Asea Brown Boveri AB
Pellinen A. D.
Williams Howard L.
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