Chan-Yeol Ryu

Comparative Study on Breakdown Voltage Characteristics of Oil-Impregnated Pressboard for VSC-HVDC Converter Transformer According to Thickness and Layer Configuration

This paper experimentally investigates the DC breakdown characteristics of oil-impregnated pressboard with respect to specimen thickness and layer configuration. Breakdown tests were conducted ten times for each condition on single specimens of 1T, 2T, and 3T thickness (nominal 1...

Analysis of Electric Field Redistribution in Oil-Pressboard Insulation of a ±525 kV HVDC Converter Transformer under AC/DC Superimposed Voltage

HVDC converter transformers are subjected to complex electrical stresses because AC and DC voltage components coexist on the valve winding. This study investigates time-dependent electric-field redistribution in the oil-pressboard insulation of a ±525 kV VSC-HVDC converter transf...