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  5. Breakdown phenomena in industrial applications

Article | REF: D2450 V1

Pre-coating and breakdown of dielectric liquids

Author: Robert TOBAZÉON

Publication date: November 10, 1997

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5. Breakdown phenomena in industrial applications

Industrial practice calls for the use of liquids with widely differing physico-chemical properties; moreover, their implementation, environmental qualities due to the design and operating constraints of the equipment vary considerably; for example:

  • mineral oil in power transformers comes into contact with various insulating materials and solids, resulting in the inevitable presence, over time, of particles, water and gases, a tendency to oxidize, and the possibility of generating and transporting charges by friction (the oil ensures cooling of the device by forced circulation); the volumes of liquids are considerable (they can reach several tens of cubic meters), and the gaps of free liquid are sometimes very large (ª 1 m in the vicinity of high-voltage outlets);

  • The situation is very different in an all-film...

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