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We have found that the issues in the DC properties of conventional cross linked polyethylene (XLPE) can be solved through the DC-XLPE insulating material. The DC-XLPE's major advantages against conventional XLPE are as follows: • High volume resistivity • Low space charge accumulation • High DC breakdown strength • Long DC life time The HVDC cable system including DC-XLPE cable, land joint, transition...
Electrical breakdown was investigated in films of low-density polyethylene by the application of both pulsed waveform and ramped voltages. Stainless-steel ball electrodes and the film to be measured were embedded in a thermoset resin. The breakdown strength FB increased with temperature T, ?FB/?T>0, between about 80?C and 100?C by application of impulse voltages. This temperature range corresponds...
Dielectric properties in semicrystalline polymers, especially electrical conductivity, thermally stimulated current or electrical breakdown have been often explained by analogous model of an inorganic crystal which has vacancies or interstitials for electron or hole traps, or an electronic band model of an amorphous semiconductor which should have a diffused edge of state density in a forbidden gap...
Impulse breakdown in high temperature range in PE is closely related with the melting of crystalline parts and its temperature dependence shows ∂FBI/∂T > 0 until a complete melting of crystalline parts. It suggests that the input energy rate from impulse electrical energy may partly be devoted to the melting of crystalline lamellae and thus enhance the breakdown voltage.
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