Summary
Extra High Voltage (EHV) XLPE cable systems are increasingly used in hydroelectric projects with underground powerhouses, where environmental and space constraints limit overhead transmission lines. This is especially true in high-altitude Himalayan region with challenging terrain and seismic activity.
Read more Read lessThis paper presents the design and installation experience of a 400 kV AC XLPE cable system for power evacuation from an underground GIS to an outdoor pothead yard in a high-altitude hydroelectric project, highlighting the key routing challenges and the practical solutions adopted.
The approach involved detailed assessment of the cable route, identification of topographical, spatial, electrical and seismic constraints and development of coordinated design and installation measures. These included specialized cable support designs and routing arrangements for steep elevation changes, an alternative spare cable philosophy using a preengineered swapping arrangement, provision of a dedicated Earth Continuity Conductor for reliable sheath voltage control and integrated interface design with GIS equipment.
The solutions were implemented to enable safe installation, effective maintenance and reliable long-term operation of the cable system under site-specific constraints. The experience presented demonstrates the importance of integrated engineering approaches for successful deployment of EHV XLPE cable systems in high-altitude and underground hydroelectric applications.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B1_10356_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | India |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
KUMAR * Akhilesh - BHEL, India; SHUKLA Dileep - BHEL, India; KAPIL Vivek - BHEL, India
Keywords
Routing, Installing, EHV, AC, XLPE, Land, Cables, Geotechnically, Challenging, Terrain
