Outdoor Substations up to 400 kV

Outdoor Substations up to 400 kV covers air-insulated outdoor substation equipment across voltage levels to 400 kV: power transformers, circuit breakers, isolators and earth switches, current and voltage transformers, surge arresters, busbars and support structures, protection, control and metering panels, and station auxiliary supplies.

An outdoor substation is defined by its clearances. Insulation levels, phase-to-phase and phase-to-earth clearances and the switchyard layout follow from the voltage and the pollution and altitude conditions at the site, and they determine the land area required, which is often the binding constraint on a project. Short-circuit withstand and protection grading are set by a system study for the network the substation connects into, so this equipment is quoted against a utility specification and a guaranteed technical particulars schedule.

Substation equipment is procured exclusively through formal tendering by electricity transmission and distribution utilities, grid corporations, energy ministries, state power corporations, railways for traction substations, large industrial and mining operators, port and airport authorities, and transmission and substation projects financed by development banks and bilateral funds. Offers are built directly from the tender document and include guaranteed technical particulars, layout and clearance drawings, type and routine test reports, make and origin declarations, warranty terms, erection, testing and commissioning scope, spares lists and third-party inspection at works.

Send us your voltage level, single line diagram and site conditions, and we will prepare a compliant technical and commercial offer.