Case Studies

Northern HV delivered full installation and commissioning of a 400/33kV 60MVA power transformer at a UK grid substation. Vacuum oil filling, IEC 61850 protection integration, and energisation on schedule — over 8,000 man-hours without incident.

Northern HV installed and commissioned a 275kV disconnector earth switch at a live UK transmission substation. Delivered within the planned outage window with zero lost time incidents.

Northern HV installed and commissioned a Hitachi Energy LTA 145D1 145kV circuit breaker using eco-efficient CO₂ gas technology. Full mechanical, electrical, and gas handling works delivered within a constrained outage window.

Northern HV carried out planned maintenance on a 132kV live tank SF₆ circuit breaker at a UK primary substation. Full hydraulic system service, timing tests, and gas quality analysis — returned to service with zero gas loss.