Development of DC 500 kV XLPE Cable and Associated Factory Joint

Abstract

We have worked on developing 500 kV DC XLPE cable.
The first time, the space charge profile was measured using model cables insulated with the improved inorganic filler-added XLPE (SXL-A). Results showed that SXL-A could sufficiently suppress space chargeunder DC voltage.
So, full-size 500 kV DC SXL-A cables with an insulation thickness of 23mm and associated factory joints were manufactured and initial electrical performance test were carried out. It was confirmed that they had sufficient initial electrical performance to satisfy the requirements for 500 kV DC XLPE cable.