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Journal of Applied Sciences
Year: 2002  |  Volume: 2  |  Issue: 4  |  Page No.: 502 - 517

Modelling of Power System Protection Signalling

Mehmet Tumay, Ilyas Eker, Vedat Kasli Ergun Ercelebi and M. Ugur Unver    

Abstract: In order to specify appropriate protection equipment and switchgear and to evaluate winding stresses and shaft torques subsequent to unsymmetrical operation full three-phase dynamic analytical techniques are necessary. In this paper a methodology of machine interconnection is presented which uses a combination of nodal analysis and current summation. In the combined method, a synchronous generator is treated not only as current source but also a voltage source. Thus in the procedure adopted it is not only the current flow which is of interest but also the voltage characteristics of the machine. When conducting simulation studies for accurate protection of the power system network, transducers (Current Transformer (CT) and Capacitor Voltage Transformer (CVT)) should be represented very accurately. The present work also describes the integration of the transducers into a small power system network for protection signalling. The transducers are represented including magnetic non-linearity and hysteresis effects. The practical application of the analysis under abnormal operation is presented and the responses of the transducers are examined.

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