![]() ![]() ![]() This paper comments on whether corona rings should be applied to 110 kV non-ceramic insulators based on the maximum levels of corona on the sheath at the live end of longrods. The 110 kV non-ceramic insulator electric field values from modelling are compared with those of 330 kV longrods from earlier work. However, for 330 kV non-ceramic insulators, manufacturers recommend fitting corona rings at the live end to reduce the electric field so that sheath damage due to corona discharge is minimised. At 110 kV, manufacturers do not recommend the fitting of corona rings to reduce the electric field. Of particular interest to this research was the effect of corona ring geometry on the electric field at the live end of high voltage non-ceramic insulators. Based on modelling and the proximity of bird chewing damage to the live end, the maximum electric field that birds will tolerate has been estimated. ![]() It has been observed that birds will only chew the dead end of insulators. A number of 110 kV insulator configurations have been modelled, including a post, a longrod and a horizontal vee assembly, to determine the electric field on the sheath at the live end. This paper applies a three-dimensional (3D) electric field analysis program to calculate the field distribution at the live end of 110 kV non-ceramic insulators used in the Queensland transmission system. ![]()
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