Summary
In countries such as India, China and Brazil, remote hydro-electric generation and long transmission distances of 1200–2000 km necessitate bulk power transfer using HVDC systems.
Read more Read lessIn India, there are 14 HVDC transmission links including the ±800 kV NEA UHVDC link
(NEA800), which is the world’s first multi-terminal ±800 kV HVDC system. At one of the three terminals of the link, an indoor DC yard is adopted with HV disconnector support insulators designed for a specific creepage distance of 30 mm/kV (total 24,800 mm). The condition is attributable to the location’s proximity to highly urbanised and industrial regions, which are associated with increased pollution levels. Under high-humidity conditions, wetting of dust deposits on porcelain insulators resulted in surface tracking and HVDC pole tripping.
This paper analyses the environmental conditions leading to the event, evaluates their impact on external insulation performance, and presents multi-pronged mitigation measures and their effectiveness, including improvements in insulator shed profile and creepage distance for indoor DC yard equipment.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B4_10556_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | India |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
BANSAL* Aman - Power Grid Corporation of India Limited , INDIA; PANDEY L K - Power Grid Corporation of India Limited , INDIA; SUROJ Srinivas - Power Grid Corporation of India Limited , INDIA; SHARMA Pankaj - Power Grid Corporation of India Limited , INDIA
