Importance of Bonding Adequacy Study
Inadequate bonding can lead to induced voltages in the cable sheath, causing overheating and reduced ampacity. This study focused on ensuring bonding adequacy in a 220kV system feeding traction substations.
Problem Statement
1. Improper bonding of UG cables can lead to unsafe voltage levels during over voltage events.
2. The 220kV transmission system required evaluation to prevent overheating, insulation stress, and potential asset failure.
3. Transient conditions like lightning and switching could induce unsafe voltages.
4. A bonding adequacy study was needed to recommend effective mitigation using sheath voltage limiters.