Table 5. String efficiency in ceramic cap and pin insulators, with and without the corona ring, for the first 4 discs by numbering from HV end to ground end. a) 230 kV. b) 400 kV. c) 765 kV

From

Comprehensive Analysis for Electric Field and Potential for Polymeric and Ceramic Insulators

Mohamad Saleh Sanjari Nia, Mohammad Altimania, Pourya Shamsi, Mehdi Ferdowsi

American Journal of Electrical and Electronic Engineering. 2020, 8(1), 26-34 doi:10.12691/ajeee-8-1-4