The Relay Protection of High Voltage Networks by G. Atabekov (Auth.)

By G. Atabekov (Auth.)

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The vector TS represents Ζ . 28) , that is, the middle of the line AB coincides with the extremity of the vector Z^ represented in Pig. 7 by the line OM. 3. 5) it follows that, in the given case M = nE^/E^. 30) S y THE METHOD OF VECTOR LOCI 5 7 represents the vector Off in the complex plane, its extremity coinciding with the middle of the line AB. 30) denotes the vector MC, coinciding or in direction with the vector MB when with the vector TO when n E ^ / E ^ ^ l . In the first case(nEj^/Ejj^l), the circle diagrams intersect the line AB at points situated along MA.

S and impedances of the equivalent sources, respectively, the transmission line being represented in the form of a four-terminal network. In the case of asymmetrical operation of the system, for example, when one phase is open or in the presence of an asymmetrical short circuit, the investigation is carried out using a single-phase representation of the network appropriate to the given condition, (see Chapter I). 18 Fig. 6. Equivalent network for transmission system. If the line, together with the compensating devices or transformer, is replaced by one asymmetrical four-terminal network, then its parameters are determined according to the rule of series connection of four-terminal networks, viz.

In Fig. 14 this six- 40 HE LAY PfiOTECTlOtf OF HIGH-VOLTAGE ili/frtOHKS r\c-r»ve wvx polè six POLE Fig. 14· Equivalent network using active and passive six-poles in the case of double asymmetry. terminal network is outlined by a do&ted line. The passive six-terminal network joined to it corresponds to the given character of the second asymmetry. At this point of asymmetry, any of the phases can be special and the passive six-terminal network can contain ideal transformers. c. network analogue it is necessary: a), to calculate its parameters according to the given open-circuit and short-circuit tests at the terminals of the active six-pole?

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