Summary
The Danish DSO Nexel is interested in developing their underground cable installations to increase bonding lead lengths that exceed the 10m industry standards to provide more flexibility in link box placement. This paper challenges the existing guidelines through advanced simulation of transient scenarios, including fault and lightning events and provides views and suggestions for future analysis. Trefoil and flat configurations with bonding leads of 10m, 20m, and 50m are studied under several lightning strike amplitudes reflecting general statistics.
Read more Read lessFactors influencing bonding lead length, such as induced sheath voltage withstand levels, joint screen interruption withstand capacities, and SVL characteristics, are defined and monitored by detailed EMT simulation. The findings suggest that fault scenarios pose minor issues and showed that bonding lead lengths up to 50m were possible for the system and scenarios presented in the paper. In contrast, the lightning scenarios reveal that direct lightning strikes pose a greater threat compared to ground strikes. Safe operations are maintained for bonding leads up to 20 meters if the lightning strike magnitude does not exceed 13 kA, while 15m lengths are feasible for strikes up to 14 kA.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | C4_11775_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Denmark |
| Study committees |
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| File size | 1,014 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
HEIM Maja - Rambøl; MATHEUS Alejandro Hernandez - Rambøl; SIEMSEN Alexander - Rambøl; DYBKJÆR Jonathan - Nexel; ERLANG Thomas - Nexel; OLSEN Rasmus Aabye - Rambøl
Keywords
Cross-bonding, Bonding Lead, Surge-Voltage-Limiter, Lightning, Transmission
