초고압 XLPE 전력케이블에 대한 설치후 교류내전압시험 현장적용

Field Application of AC High Voltage Test after Installation for EHV XLPE Power Cables

EHV power cables can take any damage during shipping, transportation, handling, storage and installation. As the damage influences a reliability of the power cable system in the short and long periods, field tests have been required, for installers, to confirm the reliability of an installed system and, for utilities, to make sure the compatibility of an installed system. Of field tests, a HV withstand test for the cable insulation has been performed to check the soundness of the insulation. For EHV XLPE power cables, the test has been done by applying a specified d.c voltage till lately. But as some problems with the d.c test is emphasized and the equipment for the a.c test is improved, the a.c test is considered positively as an after-installation test. This paper describes the recent trends of the a and its recent application in the field.