3 MW Oilfield Power System Cost Breakdown (Q3 2026 China Supplier Pricing)
3 MW Oilfield Power System Cost Breakdown (Q3 2026 China Supplier Pricing) — itemized bill of materials and FOB pricing for a typical configuration.
Estimated total (FOB): $1,050,204 · 5000 kVA transformer
Bill of materials
| Item | Specification | Qty | Price (USD) |
|---|---|---|---|
| HV incoming panel (XGN15-12) | 630 A · SF6 · 4-way | 1 | $2,350 |
| Main transformer (S13-M-5000/10) | 5000 kVA · Oil-Immersed · Copper · S13 | 1 | $51,399 |
| LV incoming panel (MNS (drawer type)) | 4000 A busbar · In 7217 A | 1 | $13,273 |
| LV feeder panel (×7) (MNS (drawer type)) | distributes 41 circuits | 7 | $92,911 |
| PFC capacitor bank (1000 kVAR) | automatic · GCK LV cabinet | 1 | $10,800 |
| Cable branch box (LV) (DFW-0.4) | 1-in / 4-out · 0.4 kV · 630 A | 10 | $6,300 |
| Series reactor (detuned) (CKSG-60.0/0.4) | 60.0 kVAR · 6% · 0.4 kV | 1 | $239 |
| Main feeder cable (TX→LV) (YJV 0.6/1kV 300 mm² ×16) | 16× 300 mm² Cu · ΔU 1.76% @ 120 m · $154.0/m | 16 | $295,680 |
| Main feeder (custom/dual busway) (Busway > 6300 A) | LV current 7217 A exceeds the largest standard busway (6300 A) — custom busway or dual-run busway required; shown as parallel cables below | 1 | POA |
| Feeder cable — Beam pump 1 (×41) (YJV 95 mm²) | 95 mm² Cu · 211 A · ΔU 2.6% · $47.2/m | 41 | $232,224 |
| Branch trunk cable (LV → branch box 1) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 2) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 3) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 4) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 5) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 6) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 7) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 8) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 9) (YJV 300 mm² ×2) | 2× 300 mm² Cu · 843 A · ΔU 1.6% · $154.0/m | 2 | $36,960 |
| Branch trunk cable (LV → branch box 10) (YJV 95 mm²) | 95 mm² Cu · 211 A · ΔU 2.6% · $47.2/m | 1 | $5,664 |
| Main busbar (Cu) (Cu 125×10) | 125×10 · 2500 A rating · ref $147.8/m | included | POA |
| Grounding electrode (Φ20mm × 2.5m rod) | R₁ 39.6 Ω → 13 rod(s) ≤ 4 Ω | 13 | $125 |
| Soft starter cabinet (largest motor) (500 kW) | Soft starter (3.0× In) · start dip 2.3% | 1 | $6,600 |
| Injection pump soft starter / protection (500 kW) | high-pressure injection pump · soft-start + overload/underload protection | 6 | POA |
| ESP variable-frequency drive (VFD) (90 kW) | ESP soft-start + speed control · downhole pump protection | 15 | POA |
Single-line diagram
How it was calculated
- Beam pumps: 20 × 37 kW = 740 kW
- Injection pumps: 6 × 500 kW = 3,000 kW
- ESP motors: 15 × 90 kW = 1,350 kW
- Connected load = 5,090 kW → demand P = 5,090 × 0.75 = 3,818 kW
- Largest motor start (motor-starting): Sstart = 500 ÷ (0.9×0.85) × 3.0 = 1,961 kVA → dip = 2.3% vs limit 15%
- Loads: P=5,090 kW, PF 0.85, 41 circuits
- Demand: 5,090 × 0.75 = 3,818 kW
- PFC: Qc = 3,818 × (0.620 − 0.329) = 1111 kVAR → 1000 kVAR bank
- Transformer: S = 3,818 ÷ 0.95 = 4018.4 kVA → 5,000 kVA standard
- Loading: 4,018 ÷ 5,000 = 80% (good range)
- Voltage regulation: 80% × 4% × sinφ ≈ 1.0% at full load
- HV: In 288.7 A, Isc 14.4 kA → XGN15-12
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 voltage do oilfield beam-pump motors run at?
Beam-pump (pumping unit) motors are typically 0.4 kV for units under 45 kW and 0.66 kV or 1.14 kV for larger units to cut cable losses across widely dispersed wells. A 37 kW unit uses 0.4 kV; wells spread over 1-2 km favour a 10/0.66 kV or 10/1.14 kV distribution with a pad-mounted substation per cluster.
Why do oilfield motors need soft-start?
Direct-on-line starting draws 5-7 times rated current and can dip the weak, long feeder voltage below 85%, stalling adjacent pumps. Soft starters limit starting current to 2.5-3.5 times and ramp torque over 10-30 seconds. This matters on off-grid or long radial oilfield feeders; the calculator checks motor-starting voltage dip and recommends soft-start or VFD.
What is an ESP and how is it powered?
An electrical submersible pump (ESP) is a downhole centrifugal pump driven by a submersible motor, fed from a step-up transformer and VFD at surface. A typical 90 kW ESP runs on a dedicated 10/0.66-3.3 kV feed through a variable-speed drive that matches pump speed to well inflow. ESPs are sensitive to voltage quality, so harmonic and dip control matter.
When is an off-grid power system right for an oilfield?
Off-grid (diesel or gas generator plus storage) suits remote wells where a grid connection would cost more than roughly $20,000-50,000 per km of line. Typical off-grid oilfield loads are 50-500 kW. Gas-driven generation using associated gas can cut fuel cost 60-80% versus diesel; the calculator prices an off-grid option alongside the grid-fed case.
What demand factor applies to a multi-well oilfield?
A multi-well oilfield with 20 pumping units rarely runs all motors simultaneously at full load; a demand factor of 0.7-0.8 is typical. Injection and ESP loads are more continuous, running 0.8-0.9. The calculator uses 0.75 by default and lets you adjust per site, preventing a 25-35% transformer oversize.
What standards govern oilfield box substations?
Pad-mounted and box-type substations for oilfields follow GB/T 17467 (prefabricated substations) and IEC 62271-202 (high-voltage/low-voltage prefabricated substations), with explosion-proof or weatherproof enclosures per the hazardous-area classification. Transformers follow IEC 60076; the calculator's BOM cites the applicable standard basis for each selected item.
Size your own configuration
Run the calculator for your exact load and get a full BOM + FOB price.
Open calculator Request a Quote