Underground power cables degrade silently through water treeing, thermal ageing, and PD erosion. Cable ageing assessment using dielectric diagnostics provides data for replacement prioritization and life extension.
Tan Delta Testing
Tan delta testing measures resistive to capacitive current ratio. As water trees grow in XLPE, tan delta increases. Multi-voltage testing reveals tree density and overall insulation degradation state.
Partial Discharge Testing
PD testing detects localized defects before complete failure. The SCYC-CW30 Cable Monitor provides online PD monitoring. The Cable Circulating Current Monitor detects sheath currents indicating insulation deterioration.
Isothermal Relaxation Current
IRC analysis applies DC voltage then measures depolarization current. The Smart Grid Platform aggregates ageing data. The Overhead Line Monitor provides complementary monitoring. VFL assists fault location.
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