TENAX, a new low-loss high-temperature resistant synthetic paper for EHV cables and other electrical equipment

For voltage levels of 300 kV and above,
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oil-impregnated cellulose paper becomes less and less efficient as insulation in underground transmission cables because of the increasing dielectric losses. Above 500 kV cellulose paper will not be applied as a result of prohibitive dielectric loss heat as well as of excessive growth of insulation thickness, so that maintaining both sufficiently low thermal resistance and acceptable bending properties becomes difficult.