5 MW Urban Infrastructure Power System Cost Breakdown (Q3 2026 China Supplier Pricing)
5 MW Urban Infrastructure Power System Cost Breakdown (Q3 2026 China Supplier Pricing) — itemized bill of materials and FOB pricing for a typical configuration.
Bill of materials
This configuration exceeds the standard single-transformer catalogue range (max ≈ 6300 kVA). It is engineered to order — contact us for a custom multi-transformer design and quotation. No standard BOM is shown to avoid misleading figures.
What drives the cost
- Equipment — the transformer/switchgear/inverter is the largest single line item.
- Storage (where applicable) — batteries are the biggest swing factor.
- Copper & freight — copper-linked cabling and freight shift landed cost ±5–10%.
Frequently asked questions
What is a prefabricated box substation and when is it used?
A box substation (compact/prefabricated substation) packages transformer, HV and LV switchgear in one weatherproof enclosure, following GB/T 17467 and IEC 62271-202. Urban infrastructure uses them for road lighting, tunnels, pumping and EV charging where a brick substation is too costly or too large. Ratings typically run 100-1600 kVA at 12/0.4 kV.
How is road and tunnel lighting power distributed?
Road lighting uses a TT or TN-S system fed from a dedicated transformer or a lighting box substation, with feeder lengths up to 1 km and voltage drop limited to 5% per CJJ 45. Tunnel lighting is a safety load requiring dual supply or emergency power. The calculator models dispersed loads and feeder radius to size the substation.
What is an SF6 ring main unit and why is it used in cities?
An SF6 ring main unit (RMU) is a compact, sealed 12-24 kV switchgear using SF6 gas for insulation and arc quenching, needing little maintenance and fitting in small vaults. Cities use RMUs on 10-12 kV ring networks to feed box substations, giving N-1 supply in dense areas. The calculator includes RMU selection for the urban feed.
What load profile does an EV charging station add to city infrastructure?
EV charging is a sharp, clustered load: a 120 kW DC fast charger can draw 120 kVA and a 10-charger station peaks near 500-1200 kVA. Demand is highly time-correlated, so diversity is low and transformer sizing must account for coincidence. IEC 61851 and GB/T 51313 govern the installation; the calculator includes charging load in the urban mix.
What cable type is used for urban 12 kV distribution?
Urban 12 kV networks use XLPE-insulated cables (YJV/YJV22 in China, IEC 60502) in cross-sections of 120-400 mm2, buried or in ducts. XLPE replaces paper-insulated PILC cables, allowing higher operating temperature (90 deg C) and lower maintenance. The calculator selects feeder cable and checks ampacity and voltage drop.
What emergency power does a city tunnel need?
Tunnels are safety-critical: lighting, ventilation and fire systems need dual supply plus a diesel generator or EPS for evacuation (GB 50052 first-class important load). Emergency lighting must restore within 0.5-15 s per GB 51309. The calculator models the emergency level and sizes the standby path for the urban loads.
Size your own configuration
Run the calculator for your exact load and get a full BOM + FOB price.
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