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Insulation dielectric loss of power cable is more obvious in ultra-low frequency than in other frequency band. The insulation dielectric loss effectively describes power cable insulating properties and the DC characteristics of the medium. A new dielectric loss tester is designed, using quasi-synchronous harmonic analysis method to measure the coefficient of dielectric loss in low frequency of 0.1 Hz, 1 Hz and 10 Hz. By comparing the differences between the coefficient of dielectric loss, the characteristics of cable insulation dielectric loss can be approximately described.

Development of Cable Dielectric Loss Tester