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Thanks to its large carrying capacity, excellent insulation property and high mechanical strength, insulated tubular bus has been widely used in power stations. Polytetrafluorethylene (PTFE) film which has been utilized as insulating material for the tubular bus is subjected to a great risk of thermal ageing that may degrade its electrical and mechanical properties. From the viewpoint of safety, it...
The effect of gamma-ray irradiation on relative permittivity, ac conductivity and dielectric loss tangent of epoxy resin and polyethylene has been investigated. Laminated samples were irradiated by 60Co gamma source at room temperature in air with a dose rate of 10 kGy/h and the total dose were 100 kGy and 1000 kGy. The dielectric properties were measured by using a Precision LCR Meter (Agilent E4980A)...
This paper presents study aimed at understanding the effect of gamma-ray irradiation on surface charge decay through bulk of epoxy resin. Laminated epoxy resin was employed as test sample which was irradiated in air up to 100 kGy and then up to 1000 kGy with dosage rate of 10 kGy / h by using a 60Co gamma-source before the test. Surface charge was introduced by corona charging method and surface potential...
Epoxy used as insulating material in electronic and electrical devices plays an important role in system reliability. Addition of nanoparticles into epoxy can improve the insulating properties compared with undoped material. However, due to the change of the material structure, trap characteristics and charge behaviors are altered as a consequence. This possibly leads to distortion of electric field...
Polymer insulating materials installed in electronic and electrical devices have been used in space equipment and nuclear power station where the materials are exposed to high energetic radioactive rays. The molecular structure can be changed by radiation induced chemical reactions that possibly lead to the variation of characteristics of surface charge dynamics, which in turn influences the safe...
Epoxy resin used as insulating material in electronic and electrical devices plays an important role in system reliability. Addition of nanoparticles into epoxy can improve the dielectric properties comparing with the undoped materials. However, due to the change of the material structure, trap characters and charge behaviors are altered as a response. This possibly leads to a great risk of electric...
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