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Distribution substation site selection factors

Short answer

An industrial distribution substation receives utility supply at11 kV and steps it down to400/230 V. Site selection factors: near load centre to minimise cable losses, proximity to HT supply, access, space, firm well-drained ground, safety from hazards, clean ventilated environment, cost and utility regulations.

Define distribution substation for an industrial plant. What are the factors to be considered for the selection of location of site for the substation?

A distribution substation of an industrial plant is the installation that receives power at 11 kV (or 33 kV) from the utility and, through transformers, switchgear and protection, supplies the plant at 400/230 V.

Factors for selecting the substation site

  1. Load centre: the site should be near the centre of gravity of the loads, found as x̄ = Σ(Pᵢ·xᵢ) / ΣPᵢ, ȳ = Σ(Pᵢ·yᵢ) / ΣPᵢ. This minimises LT cable length, voltage drop, losses and cost.
  2. Nearness to HT supply: short route for the incoming 11 kV line or cable.
  3. Access: approach road for bringing in the transformer and for maintenance and fire vehicles.
  4. Space: room for the equipment, safety clearances, fencing and future extension.
  5. Ground and drainage: firm, flood-free, well drained land with low soil resistivity for earthing.
  6. Safety: away from fire hazards (fuel, chemicals, explosives), vibration and people movement.
  7. Environment: clean, ventilated and dust-free; indoor type if the air is dusty or corrosive.
  8. Cost: land cost and cost of cables and civil works.
  9. Utility rules: approval of the supply authority and statutory clearances.

✓ Answer checked by Claude Opus 5.5 (high effort)

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