H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/16
H02H 7/26 (2006.01)
Patent
CA 1312941
19 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 comprises a protection unit, terminal, at both ends of each line. All the terminals (M1, M2, P1, P2) comprise an identical basic design comprising measurement of phase quantities (17), filter- ing (18) and A/D conversion (19). Furthermore, the identical part comprises 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 comprises a local logic unit which, by means of a transient and steady state analysis, finds out whether an event on the network is due to a fault or a connection/dis- connection 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. (Figure 2)
587074
Bergman Sten
Ljung Stefan
Asea Brown Boveri Ab
Robic
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