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Low-fire-hazard cable (LFHC) intended for low voltage applications with a fire barrier made from mica tape was tested under conditions similar to those of the fire test specified in IEC 60331-21. In addition to the other standard requirements, the measurement setup was modified to enable insulation resistance measurement throughout the entire fire test. In this manner, cable insulation as a whole...
Power transformers are inconsiderable group of the electrical appliances with two components insulation system. One of the components - liquid insulating medium plays two roles- insulating and cooling. It can be mineral as well as synthetic based liquid. Second component is an organic based solid insulation usually of cellulose character. Organic materials of this structure are sensitive to an operational...
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