Research and development of ±250 kV DC XLPE cables

This paper describes the development of k250 kV DC XLPE cables. Through a series of material investigations and evaluation of model cables using two kinds of XLPE compound containing inorganic filler to suppress the accuinulation of space charge within XLPE insulation, f250 kV DC XLPE cables and factory joints were designed and manufactured. ʹIo check the DC electrical performance and reliability of zk2.50 kV DC submarine cable, the electrical, mechanical test and the long-term aging test were performed. The test results showed that they had sufficient properties and reliability for practical use.