3MW 油田供电系统（2026年第三季度中国供应商价格）
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
成本敏感因素
- 设备 — 变压器/开关柜/逆变器是最大单项。
- 储能 — 电池是最大变量。
- 铜价与运费 — 铜价联动线缆与运费使到岸成本 ±5–10% 波动。
常见问题
油田游梁式抽油机电机用多大电压？
游梁式抽油机电机 45 kW 以下典型用 0.4 kV，更大机组用 0.66 kV 或 1.14 kV 以降低分散井场的电缆损耗。37 kW 机组用 0.4 kV；井距 1-2 km 的井场宜采用 10/0.66 kV 或 10/1.14 kV 配电，每簇配一台箱式变电站。
油田电机为什么需要软启动？
直接启动电流为额定值的 5-7 倍，会使弱而长的馈线电压跌到 85% 以下，导致相邻泵停机。软启动器把启动电流限制在 2.5-3.5 倍、10-30 秒内斜坡升矩。这在离网或长放射式油田馈线上尤其重要；计算器校核电机启动压降并推荐软启动或变频。
什么是电潜泵（ESP），它如何供电？
电潜泵（ESP）是由潜油电机驱动的井下离心泵，地面经升压变压器和变频器供电。典型 90 kW ESP 由专用 10/0.66-3.3 kV 馈线经变频器供电，使泵速匹配井的供液能力。ESP 对电压质量敏感，因此谐波与压降控制很重要。
油田什么时候适合用离网供电系统？
离网（柴油/燃气发电 + 储能）适合偏远井场，因为电网接入每公里线路成本约 2-5 万美元。典型离网油田负荷 50-500 kW。用伴生气发电可比柴油省 60-80% 燃料费；计算器对离网方案与并网方案并列报价。
多井油田该取多大的需用系数？
20 台抽油机不会同时满载运行，需用系数典型取 0.7-0.8；注水泵和 ESP 负荷更连续，取 0.8-0.9。计算器默认 0.75 并可现场调整，避免变压器超配 25-35%。
油田箱式变电站遵循哪些标准？
油田箱式变电站遵循 GB/T 17467（预装式变电站）和 IEC 62271-202（高/低压预装式变电站），外壳按危险区域分级做防爆或全天候防护。变压器遵循 IEC 60076；计算器 BOM 会逐项标注适用标准依据。