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How does sudden changes in load in a DC machine cause “flash over”?

March 18, 2018 by

DWQA Questions › Category: DC Motor & Generator › How does sudden changes in load in a DC machine cause “flash over”?
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admin Staff asked 5 years ago
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admin Staff answered 5 years ago

Answer: As the load on a generator changes suddenly, the armature reaction causes severe distortions of flux in the air gap. This causes irregular voltage distribution around the commutator. The high value of voltage between segments over a portions of commutator may cause flashover particularly in high voltage machine where the average voltage per segment is necessary high.

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