Identification of jointsaffected by water ingress in complex hybrid MV cable networks: 2 Field examples of combined VLF withstand testing, with Tan Delta (TD) and Partial Discharge(PD) diagnostics

Hybrid MV cable networks can be a very complex compound of PILC, XLPE, high number joints, and joints with different kind of weaknesses in different elements of one cable line. Condition based maintenance strategies in such networks require a combination of testing methodologies and differentiated interpretation of test results.