Title :
Effect of the tap changer position of Zeus 765/400kV transformer on the steady state and voltage stability performance of the Cape system
Author :
Dyantyi, Ayanda ; Mbuli, Nhlanhla ; Pretorius, JHC
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Johannesburg, Johannesburg, South Africa
Abstract :
Previously published research findings [1] on the impact of tap changer position on the steady state performance of distribution networks indicate that very little impact results from varying the tap changer position. In this paper, a similar investigation is carried out, but on a network with very high voltage transmission lines operating in parallel with a well-developed corridor of 400kV lines. The per-unit impedance of a line is reduced drastically as the line voltage is increased. When the design voltage of the transmission lines is high, the transformer impedance becomes dominant and plays a key role in the system. This paper investigates the effect of varying the impedance of a 765/400kV transformer on the steady-state (loadflow and active power losses) and voltage stability of the Cape corridor.
Keywords :
distribution networks; on load tap changers; power system stability; power transmission lines; Cape system; Zeus transformer; distribution networks; line voltage; steady state performance; tap changer position; transformer impedance; very high voltage transmission lines; voltage 400 kV; voltage 765 kV; voltage stability performance; Impedance; Power system stability; Power transformers; Power transmission lines; Stability analysis; Thermal stability; Windings; power flow; system losses; tap changer; transformer; voltage stability;
Conference_Titel :
Environment and Electrical Engineering (EEEIC), 2012 11th International Conference on
Conference_Location :
Venice
Print_ISBN :
978-1-4577-1830-4
DOI :
10.1109/EEEIC.2012.6221440