Circuit interruption phenomena in three-phase multiconductor transmission systems

Abstract EN

With a rising trend for transmission system voltages in the EHV and UHV ranges and a consequent increase in insulation costs of these networks together with their associated equipment, the need for rigorous system analysis for the sake of optimal design considerations is realized.

This paper highlights the significance of fairly accurate analysis of interruption phenomena in three-phase multiconductor transmission systems as an essential prerequisite for the optimal design and operational requirements of interruption equipment.

A mathematical algorithm has been developed in the paper to simulate very accurately the transient wave-front of fault current following fault inception.

The development is then implemented to compute waveforms of recovery transient voltages at circuit breaker location in the crucial microseconds succeeding contact separation.

In the paper distributed parameter as well as frequency dependance effects are being considered.

Furthermore the influence of source effects on the recovery transient initial rate of rise and on its maximum values are adequately highlighted.