Engineering & Consulting

Root cause analysis for overvoltage caused by arc-through of load switches

Unexpected flashovers occurred at certain sections in the SBB overhead system, which caused electric arcs and protection trips. ENOTRAC performed a series of measurements together with SBB in order to understand the root cause of this, and to determine possible remedial measures.

The measurement results were compared with theoretical simulations. This led to understanding that flash over of load switches caused reflections at the end of conductors, where high overvoltage occurred. These overvoltages could exceed the insulation capability of some components. Possible measures against these effects can now be assessed because of this understanding.

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