Surge propagation in three-phase pipe-type cablesߞPart II: Duplication of field tests including the effects of neutral wires and pipe saturation

Field tests of surge propagation in 69-kV pipe-type cables are successfully duplicated using an analytical model. The solution techniques are general and can be applied for any waveshape or travel time. Included in the model are the effects of shield tape and skid wires. Proximity effects in the cable elements are represented. In addition to field-test comparisons, the effects of different elements in the model are illustrated by computing the step responses. These models can be used in digital transients programs and Transient Network Analyzer (TNA) studies to determine proper insulation and protection requirements in cable systems for lightning and switching surge transient overvoltages.