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A model for fast switching transients in power systems: the near zone concept

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1 Author(s)
Rodewald, A. ; E. Haefely & Co. Ltd., Basel, Switzerland

The author presents a simple time-domain model which makes it possible to predict the order of magnitude of the highest di/ dt values generated by closing switches in electrical power systems. The model is based on traveling-wave analysis. It is demonstrated that two different approaches must be applied, according to whether (a) the closing time, Ts, of the switch is faster than twice the traveling time to the first reflection point or (b) Ts is much slower. Under condition (b) the well-known quasistationary approach di/dtmax=U0/L can be used, where U0 is the switched voltage and L is the self-inductance of the line between the stray capacitances located to the left and the right of the switching device. Under condition (a) a new formula must be applied: di/dt max≈2 U0/ZTs, where Z is the line impedance of the line in which the switching device is installed and Ts is the time during which the voltage across the switch collapses from U0 to zero. Experimental results are given from both fast and slow closing switches

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:31 ,  Issue: 2 )