Part ofmorsonPRAXISHV and EHV cable circuits have to carry their rated current without exceeding conductor temperature limits, and their bonding and sheath arrangements have to be safe under fault. We size cables, calculate ratings along the full route and design the bonding scheme — balancing cost against thermal, volt-drop and installation limits.
HV and EHV cable circuits sit at the heart of every connection, and getting the specification right is a direct trade-off between cost, thermal performance and installation practicality. We calculate current ratings along the full route — accounting for burial depth, soil thermal resistivity, grouping, duct and HDD sections and crossings — and size the conductor against the worst-case section rather than the easiest.
Alongside the rating work we design the sheath bonding scheme, which governs sheath voltage during faults, induced voltage in normal operation and the protection arrangement agreed with the connecting party, and we confirm pulling forces and route layout ahead of installation. The same approach applies from 11 kV distribution circuits up to 400 kV HVAC and 320 kV HVDC transmission cables, using tools such as Cableizer, ELEK and CDEGS.
Tell us about your connection or compliance challenge and we’ll scope it with you.
Independent UK power systems consultancy — modelling, compliance studies and technical analysis for complex grid-connected projects.