Effect of restriking on recovery voltage

Concordia, C.; Skeats, W. F.

doi:10.1109/ee.1939.6431479

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the interaction between phases a reignition in one phase may induce currents in the other phases that may create current zeros and virtual current chopping [l], [2]. This could generate very high overvoltages, and there is some evidence that this gives the highest overvoltages when switching highvoltage motors with vacuum circuit breakers [2]- [5].…”

Section: Discussionmentioning

confidence: 99%

Voltage escalation in vacuum switching operations

Greenwood

Glinkowski

1988

IEEE Trans. Power Delivery

View full text Add to dashboard Cite

The ability of vacuum switching devices to interrupt high frequency currents can lead to repeated prestrikes and clearings when such switches are being closed and repeated reignitions and clearings when the switches are opening. This paper focuses on the interruption of a motor inrush current (aborted starts) where the successive trapping of magnetic stored energy in the motor winding and its subsequent release to the motor and cable capacitance, can result in the development of a sequence of escalating voltage surges. Of particular concern is the sudden collapse of voltage when sequential reignitions occur and the impact of this on the interturn insulation of the motor winding. The study reports on many simulated tests with circuit breakers of different manufacturers and attempts through analysis to identify cause and effect with respect to the magnitudes of the voltages developed and the characteristics of the switch, paying particular attention to the rate of dielectric recovery of the contact gap and the dI/dt interrupting capability of the switch.

show abstract

Section: Discussionmentioning

confidence: 99%