By G. Atabekov (Auth.)
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Extra info for The Relay Protection of High Voltage Networks
The input admittance Y ^ (or e< ua l ^ ^e ratio of the current to the voltage at the M terminals (or Ν terminals respectively) of the passive four-terminal network when the other pair of terminals is short-circuited. to The transfer admittance Y ^ (or ^ l ^ ' i s ratio of the current at the short-circuited M terminals (or Ν terminals respectively) of the passive four-terminal network to the voltage applied to the other pair of terminals: Any four-terminal network composed of linear bilateral impedances obeys the law of reciprocity; the following equations are thus fulfilled (Ref.
6, deals with the "admittance method". 5. f. Varies at the Transmission Tgrminale The impedance at the relay terminals is determined by * This condition is generally fulfilled when symmetrical threephase networks are represented on a single-phase basis. THE METHOD OF VECTOR LOCI 51 the connections of the current and voltage circuits (Chapters V and VI) from the parameters and operating conditions of the system. 5). 2. Value of the multiplier ρ Relay Scheme Relation of voltage to^ current Distancing from inter- earth from phase short short circuit circuit OAB OAB "A i A-1b U 300 Multiplier j) I/3V 1 tA + k3/0 1 Power direction 30° 60· üc 0Ac ¡A 'A „-760· 3 VZe~ *» j 60* UOA OAC 'A-'Β e-M- 90' ûBC 'A fZe-W ISO· tfflc i A-i Β g—7120· When there is an unbalance condition in the system, the expression for the impedance measured at the relay terminals is not so easily obtained.
Considering the resistance of the electrical arc at the fault as a varying parameter, we can obtain circle diagrams, graphically showing the changes in magnitude and the mutual orientation of current and voltage vectors as a function of the arc resistance (Ref. 6). The vector locus method has been used for estimating the performance of various types of protective relays, in particular, of distance relays and directional elements, by comparing the values of impedances or admittances at the relay terminals with the corresponding relay tripping characteristic, plotted in the same complex plane, (Ref.