Harting Sbírka katalogů říjen 2013

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Vydal: HARTING s.r.o. Autor: HARTING

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2.4. The following behaviour insulation materials the presence of surges can occur: - decomposition the insulating material; - the wearing away insulating material action electrical discharges (electrical erosion); - the progressive formation conductive paths which are produced on the surface solid insulating material due the combined effects of electric stress and electrolytic contamination the surface (tracking) NOTE: Tracking erosion will occur when - liquidfilm carrying the surface leakage current breaks, and - the applied voltage sufficient break down the small gap formed when thefilm breaks, and - the current sufficient provide sufficient energy locally thermally decompose the insulating material beneath the contamination. Under these conditions many the materials may exhibit two, even all three the characteristics stated..1 Insulation material groups Extract from IEC 60664-1 Comparative tracking index (CTI) Insulating materials can roughly characterized according the damage they suffer from concentrated release energy during surges when a surface leakage current interrupted due drying the contaminated surface.1.6.. flashover can result complete connection made.4) The creepage distance the shortest distance along the surface insulation material between two conductive parts.6) - Insulation group - Degree pollution (see 4. 4. The behaviour the insulating material under various contaminants and voltages extremely complex. Deterioration increases during the time which currentflows.2 Creepage Distances Creepage paths for surface currents can form the surface insulation materials.6. The following are the major criteria for determining the creepage distances: - Rated voltage (see 4. The different properties the surface the insulating materials and contamination from the surroundings promote this process. direct 164 ____________________________________________________________ .] does not exist. A method classification for insulating materials [.6