1 MW Port Crane Power System Cost Breakdown (Q3 2026 China Supplier Pricing)
1 MW Port Crane Power System Cost Breakdown (Q3 2026 China Supplier Pricing) — itemized bill of materials and FOB pricing for a typical configuration.
Estimated total (FOB): $161,139 · 800 kVA transformer
Bill of materials
| Item | Specification | Qty | Price (USD) |
|---|---|---|---|
| HV incoming panel (KYN61-40.5-1250-25) | 1250 A / 25 kA · vacuum | 1 | $4,451 |
| Main transformer (S13-M-800/35) | 800 kVA · Oil-Immersed · Copper · S13 | 1 | $13,937 |
| LV incoming panel (GGD-1600) | 1600 A busbar · In 1155 A | 1 | $4,549 |
| LV feeder panel (GGD-1600) | distributes 4 circuits | 1 | $4,549 |
| Main feeder cable (TX→LV) (YJV 0.6/1kV 240 mm² ×3) | 3× 240 mm² Cu · ΔU 1.56% @ 100 m · $123.0/m | 3 | $36,900 |
| Feeder cable — Quay crane 1 (×4) (YJV 120 mm² ×2) | 2× 120 mm² Cu · 515 A · ΔU 2.1% · $68.8/m | 8 | $55,040 |
| Main busbar (Cu) (Cu 80×8) | 80×8 · 1400 A rating · ref $75.6/m | included | POA |
| Grounding electrode (Φ20mm × 2.5m rod) | R₁ 39.6 Ω → 13 rod(s) ≤ 4 Ω | 13 | $125 |
| Dynamic reactive compensation (SVC/SVG) (±1 Mvar) | Static Var Generator · fast response for impact loads · FOB reference | 1 | $28,000 |
| Detuned PFC capacitor bank (899 kvar) | automatic · 7% detuned · 0.4 kV | 1 | $10,800 |
| Series detuning reactor (7%) (62.9 kvar) | 189 Hz tuning · below 5th harmonic | 1 | $2,788 |
| Quay crane regenerative drive (500 kW four-quadrant) | regenerative VFD (energy feedback on lowering) · per crane | 2 | POA |
| Shore power supply (岸电) (150 kVA) | 50/60 Hz frequency converter + shore connection panel · IEC/ISO 80005-1 · quoted per project | 1 | POA |
Single-line diagram
How it was calculated
- Quay cranes: 2 × 500 kW = 1,000 kW
- Impact peak = 1,000 × 1.3 = 1,300 kW (short-time)
- Largest drive start (motor-starting): 500 kW × 1.3 → dip 4.2% vs limit 10%
- Reactive compensation: Qc = 1,300 × (tanφ₁ − tanφ₂) = 899 kvar (SVC/SVG + detuned bank)
- Harmonics: THDi 30% → Ih = 804 A · 7% detuned reactor (f_res 189 Hz)
- Loads: P=1,000 kW, PF 0.70, 4 circuits
- Demand: 1,000 × 0.6 = 600 kW
- Transformer: S = 600 ÷ 0.95 = 631.6 kVA → 800 kVA standard
- Loading: 632 ÷ 800 = 79% (good range)
- Voltage regulation: 79% × 4% × sinφ ≈ 1.0% at full load
- HV: In 13.2 A, Isc 8.2 kA → KYN61-40.5-1250-25
- LV: In 1155 A, Isc 27.8 kA (Xfmr Z 4% + system 0.2%) → GGD-1600, 1 feeder panel(s)
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
How do impact loads affect power quality at a port?
Quay cranes and winches impose rapid, large load swings (impact loads) that cause voltage flicker. The impact factor is the ratio of peak to average load, often 1.3-1.5. When flicker violates GB/T 12326 limits, a dynamic reactive compensator (SVC or SVG) with 5-20 ms response is added. The calculator sizes compensation from the impact factor.
Why do arc furnaces need SVC or SVG compensation?
Electric arc furnaces draw erratic current with severe flicker and harmonics, pulling power factor down to 0.6-0.7 during meltdown. An SVC or SVG rated 30-50% of furnace capacity restores power factor and damps flicker to meet GB/T 12326 and IEEE 519. A 50 MW furnace typically needs 15-25 Mvar of dynamic compensation.
What voltage level feeds a port crane system?
Large quay cranes (500 kW-1.5 MW per crane) are fed at 10 kV or 35 kV, stepped down near the berth to 0.4/0.69 kV for drives. A 10 kV ring feed with RMU or switchgear along the quay is standard. The calculator's 35 kV default models a multi-berth crane cluster; smaller ports use 10 kV.
How are crane harmonics controlled?
Crane drives are VFD-based, injecting 5th, 7th, 11th harmonics; THDi commonly reaches 30% without treatment. Active front-end (AFE) drives or a passive detuned filter plus an APF keep THD under the IEEE 519 limit of 5-8% at the point of common coupling. The calculator sizes harmonic filtering when THDi exceeds the threshold.
What is the typical crane duty cycle for sizing supply?
Quay cranes run intermittent duty (hoist/lower/travel), so average demand is 40-60% of installed power even during busy periods. Supply transformers are sized to the peak simultaneous demand plus starting inrush of the largest hoist, not the sum of nameplates. The calculator applies an impact factor and diversity to avoid oversizing.
What short-circuit duty must port switchgear withstand?
Port 35 kV switchgear is usually rated 25-31.5 kA; 10 kV panels 25-31.5 kA; LV boards 50-65 kA. The rating must exceed the computed fault current at each busbar (IEC 60909). Crane drives contribute fault current, so a 35 kV bus fed by a 50 MVA source needs at least 25 kA. The calculator checks panel ratings against the fault level.
Size your own configuration
Run the calculator for your exact load and get a full BOM + FOB price.
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