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水泵站电力系统计算器

为供水或污水处理泵站进行配电选型 — 水泵负载、变压器与开关柜选择、软启动器或VFD选择，以及变速与定速能耗比较。

开始计算水处理与泵送解决方案

为什么使用此计算器

泵站是核心的水利基础设施负载。该计算器根据水泵功率、数量和同时系数为变压器选型，选择启动方式（软启动器或VFD）并进行电压跌落校验，同时利用相似定律估算VFD控制的年节能量。

Worked Examples

Example 1 — 6 × 160 kW Pump Station (Soft Starter, VFD Comparison) · FOB $217,600

Water pumping power system · 10kV/0.4kV · Soft starter

1,000 kVA transformer

SCB13-1000/10 · 6 pumps × 160 kW · Soft starter

Connected load

960 kW

Demand (Ks 0.7)

672 kW

Start dip

3.8%

VFD saving

60% energy

Est. total (FOB)

POA

📦 Bill of Materials

Equipment	Model	Spec	Qty
HV incoming panel	KYN28A-12-630-25	630 A / 25 kA · vacuum	1
Main transformer	SCB13-1000/10	1000 kVA · Dry-Type · Copper · SCB13	1
LV incoming panel	GGD-1600	1600 A busbar · In 1443 A	1
LV feeder panel	GGD-1600	distributes 6 circuits	1
PFC capacitor bank	200 kVAR	automatic · GCK LV cabinet	1
Cable branch box (LV)	DFW-0.4	1-in / 4-out · 0.4 kV · 630 A	1
Series reactor (detuned)	CKSG-12.0/0.4	12.0 kVAR · 6% · 0.4 kV	1
Main feeder cable (TX→LV)	YJV 0.6/1kV 240 mm² ×4	4× 240 mm² Cu · ΔU 1.17% @ 80 m · $123.0/m	4
Feeder cable — Pump 1 (×6)	YJV 150 mm²	150 mm² Cu · 272 A · ΔU 1.4% · $86.0/m	6
Branch trunk cable (LV → branch box 1)	YJV 150 mm² ×2	2× 150 mm² Cu · 543 A · ΔU 1.4% · $86.0/m	2
Main busbar (Cu)	Cu 100×10	100×10 · 2000 A rating · ref $118/m	included
Grounding electrode	Φ20mm × 2.5m rod	R₁ 39.6 Ω → 13 rod(s) ≤ 4 Ω	13
Soft starter cabinet (×5)	160 kW	Soft starter (3.0× In)	5
Pump units (motor + impeller)	160 kW	centrifugal pump · duty/standby	6
Control valves & actuators	DN (per line)	flow control / isolation valves + actuators	3

📐 Single-line diagram

⚙️ Electrical schematic (protection & metering)

⛳ Grounding grid layout

🔌 Cable schedule & routing

🗄 Switchgear arrangement

🛡 Protection configuration

📋 Protection settings

Circuit	Protection	Setting	Time	Standard
HV incoming 10 kV	50 instantaneous	462 A	inst	IEC 60255-151 / IEEE 242
HV incoming 10 kV	51 overcurrent	69 A	0.5 s	IEC 60255-151 / IEEE 242
HV incoming 10 kV	51N earth-fault	12 A	0.5 s	IEC 60364-4-41
Transformer 1000 kVA	49 thermal overload	71% of rated	alarm 90%	IEC 60076-7 / IEEE C57.91
LV incoming 0.4 kV	50 instantaneous	11547 A	inst	IEC 60947-2
LV incoming 0.4 kV	51 overcurrent	1732 A	0.3 s	IEC 60947-2 / IEC 60255
LV incoming 0.4 kV	51N earth-fault	289 A	0.3 s	IEC 60364-4-41
Pump 1	50/51/51N (MCCB)	Ir 299 A - Im 2174 A - Ig 54 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
Pump 2	50/51/51N (MCCB)	Ir 299 A - Im 2174 A - Ig 54 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
Pump 3	50/51/51N (MCCB)	Ir 299 A - Im 2174 A - Ig 54 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
Pump 4	50/51/51N (MCCB)	Ir 299 A - Im 2174 A - Ig 54 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
Pump 5	50/51/51N (MCCB)	Ir 299 A - Im 2174 A - Ig 54 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
Pump 6	50/51/51N (MCCB)	Ir 299 A - Im 2174 A - Ig 54 A	0.1 s (grading)	IEC 60947-2 / IEC 60255

Settings are illustrative starting points — confirm with a protection coordination study per IEC 60255 / IEEE 242.

📚 Calculation book

CALCULATION BOOK

1000 kVA - 10kV/0.4kV - single - illustrative

1. Load calculation

Standard: IEC 60076 - IEC 60364-5-52

Parameter	Formula	Value
Connected load	P = sum(kW)	960 kW
Demand factor	Kd	0.7
Demand power	Pd = P x Kd	672 kW
Power factor	cos(phi) before -> after	0.85 -> 0.95
Design apparent power	Sd = Pd / cos(phi)	707 kVA
Transformer loading	Sd / Srated	71%

2. Short-circuit calculation

Standard: IEC 60909

Parameter	Formula	Value
System impedance (pu)	Zs = S / Ssc	0.33% (on 1000 kVA base)
Transformer impedance	Zt = Z%	6%
Total impedance	Z = Zt + Zs	6.33%
LV prospective Isc	Isc = In / Z	22.8 kA
HV prospective Isc	Isc = Ssc / (sqrt(3) x V)	17.3 kA
Breaking check	Icu >= Isc	LV 25 kA (1.1x margin) PASS

3. Voltage drop

Standard: IEC 60364-5-52 Annex G

Parameter	Formula	Value
Main feeder	dU = sqrt(3) x I x L x R / V	240 mm2 - dU 1.17% @ 80 m
Limit	max 3%	within limit
Transformer volt. reg.	dU ~ loading x Z% x sin(phi)	1.3% at full load

4. Reactive power / harmonics

Standard: IEC 61921 (PFC) - IEEE 519 (harmonics)

Parameter	Formula	Value
Required compensation	Qc = Pd x (tan1 - tan2)	196 kvar
PFC bank	standard step	200 kvar
Detuned reactor	p = 6%	12.0 kvar @ 6% (anti-resonance)

5. Grounding

Standard: IEC 60364-5-54 earthing arrangements and protective conductors LV earthing target 10 ohm (TN systems); 4 ohm used as a conservative design target - target 4 ohm

Parameter	Formula	Value
Single rod resistance	R1 = rho/(2 x pi x L) x ln(4L/d)	39.6 ohm
Rods required	n = R1 / (target x 0.8)	13 rod(s) <= 4 ohm
Rod spec	dia x length	20 mm x 2.5 m

This calculation book is illustrative it consolidates the computed values with the referenced standards. A licensed engineer must verify and seal final design documents for construction.

🔧 Secondary schematic (control & signal)

🔩 Terminal strip (typical)

⚙️ Soft-start / VFD selection

Parameter	Value
Pump	160 kW · started Soft starter (3.0× In)
Start voltage dip	3.8% vs limit 15% — OK ✓
Starters / VFD panels	5 × Soft starter (160 kW each)

💰 Fixed-speed vs VFD energy (per year)

Parameter	Value
Fixed-speed (throttle)	2,176,000 kWh/yr · $217,600
VFD (affinity law, 70% flow)	878,080 kWh/yr · $87,808
Annual saving	1,297,920 kWh/yr (60%) · ≈ $129,792/yr

📏 Standard basis (依据标准)

Topic	Standard
Standard basis	IEC · IEC 60364-5-52
Conductor ampacity	IEC 60364-5-52 Table B.52.2–B.52.5 (copper, 3 loaded conductors, 30°C ambient, PVC) — typical/rounded values, conservative (±3%)
Voltage-drop limit	IEC 60364-5-52 Annex G · max drop 3%
Winding temp rise	IEC 60076-11 — dry-type Class F 100 K rise
kVA ratings	IEC 60076-1 R10 preferred numbers
Breaker frames	IEC 60947-2 frame sizes (In)
Grounding target	IEC 60364-5-54 earthing arrangements and protective conductors — LV earthing target ≤ 10 Ω (TN systems); 4 Ω used as a conservative design target · target 4 Ω
Pumping station design	GB 50265 — design code for pumping stations
Rotating machines	IEC 60034 — rotating electrical machines
Adjustable-speed drives	IEC 61800 — VFD & pump system energy efficiency
Power supply design	GB 50052 — code for design of electric power supply systems

🧮 How it was calculated

1. Pumps: 6 × 160 kW = 960 kW connected

2. Demand P = 960 × 0.7 = 672 kW

3. Start method Soft starter: start kVA = 627 kVA → dip 3.8% (limit 15%)

4. Fixed-speed energy = 4 × 160 × 0.85 × 4000 h = 2,176,000 kWh/yr

5. VFD energy (affinity law) = 4 × 160 × 0.7³ × 4000 h = 878,080 kWh/yr

6. Saving = 1,297,920 kWh/yr (60% ≈ $129,792/yr @ 0.1 $/kWh)

7. Loads: P=960 kW, PF 0.85, 6 circuits

8. Demand: 960 × 0.7 = 672 kW

9. PFC: Qc = 672 × (0.620 − 0.329) = 196 kVAR → 200 kVAR bank

10. Transformer: S = 672 ÷ 0.95 = 707.4 kVA → 1,000 kVA standard

11. Loading: 707 ÷ 1,000 = 71% (good range)

12. Voltage regulation: 71% × 6% × sinφ ≈ 1.3% at full load

13. HV: In 57.7 A, Isc 17.3 kA → KYN28A-12-630-25

14. LV: In 1443 A, Isc 22.8 kA (Xfmr Z 6% + system 0.3%) → GGD-1600, 1 feeder panel(s)

15. Cable branch boxes: 1 × DFW-0.4 (1-in/4-out) for feeder grouping

16. Grounding: R₁ 39.6 Ω → 13 rod(s)

17. Main feeder: 4× 240 mm² · ΔU 1.17% — OK

Summary
Estimated total (FOB Qingdao, EXW) — priced equipment				$144,195

📋 Design notes

Pricing basis: FOB Qingdao (EXW) equipment price. Freight, duty and installation are not included — add for landed economics.

Transformer loading: 71% at design demand — good range.

Short-circuit check: HV 17.3 kA vs 25 kA (1.4× margin) · LV 22.8 kA vs 25 kA (1.1× margin).

Voltage regulation: ≈ 1.3% at full load (typical limit 5%).

Power factor correction: 200 kVAR automatic bank corrects PF to 0.95.

Copper price linkage: Copper-wound transformer price tracks LME copper (current $14,115/t · 2026-09-14 · LME Copper (Sina hf_CAD)).

Parallel conductors: Single-cable ampacity exceeded — parallel conductors specified: main feeder 4× 240 mm², branch trunk 1 2× 150 mm² (per IEC 60364-5-52 / GB 50054).

Cable & grounding pricing: Cable conductors and grounding are priced from the confirmed cables-trays-grounding price reference (per-metre copper YJV; aluminium remains POA). The main copper busbar is POA — its length is project-specific.

Busway (high-current feeders): For LV feeders above ~2500 A, a busway (母线槽) trunking system is recommended instead of parallel cables.

Starting: Each 160 kW pump started Soft starter draws a 3.8% bus dip (within 15% limit).

VFD savings: At 70% average flow, VFD control saves ≈ 60% energy vs fixed-speed throttling (1,297,920 kWh/yr). Actual savings depend on the pump duty profile.

Static head correction: The affinity-law saving (P∝n³) assumes negligible static head. Where the pump lifts against a static head (elevation/tank pressure), the achievable saving is lower — the calculated figure is the ideal upper bound.

Pumps & valves: Pump units and control valves are quoted per project (POA) — this calculator sizes the electrical side (transformer, switchgear, starters/VFD).

Simultaneity: Not all pumps run together — demand factor 0.7 avoids oversizing the transformer.

计算过程说明

选型计算方式

需用功率 P = 水泵台数 × kW × 同时系数。启动方式决定启动电流倍数kst及由此产生的母线电压跌落。对于VFD运行，轴功率遵循相似定律 P ∝（转速）³，因此在降低的平均流量下运行可节省节流能耗的约（1 − 流量³）。

适用标准

选型参考GB 50265（泵站设计）、IEC 60034（旋转电机）、IEC 61800和GB/T 25409（可调速驱动）以及GB 50052（供电设计）。

常见问题

泵站用软启动器还是变频器更好？

软启动器适合仅启动恶劣的恒流量泵，成本比变频器低 40-60% 且损耗更低。当流量变化大（平均流量低于额定的约 80%）时变频器划算，因为泵功率遵循相似三次方定律——降速 20% 可省近 50% 电能。计算器对比两者并估算变频回本周期。

变频器在泵上能省多少电？

泵功率随转速三次方变化（相似定律）。80% 转速约耗满速功率的 51%，70% 转速为 34%。一台 160 kW 泵年运行 4000 小时、平均流量 0.7 时，变频可比节流省 40-50% 电能。计算器会量化你的工况点下的节电量和费用。

多泵泵站需要多大变压器？

把各泵额定功率相加，乘以同时系数（多泵 0.6-0.8）和功率因数（0.85-0.9），再取邻近标准 kVA。6 台 160 kW 泵、同时系数 0.7、功率因数 0.88 约需 760 kVA，取 800 kVA。还需考虑最大泵启动；计算器把变压器与开关柜一并选型。

泵电机馈线电缆选型遵循哪些规则？

泵馈线电缆按载流量（IEC 60364-5-52）和电压降选型，并要耐受电机启动电流。160 kW、0.4 kV 电机满载约 290 A、直接启动约 5 倍；电缆须能短时承受启动电流并保持稳态压降 5% 以内。计算器推荐截面积并校核启动压降。

如何对比定速与变速泵的能耗？

定速泵满速运行并通过节流调流量（浪费扬程），变速泵则让转速匹配需求。70% 流量工况下变速可省约 34% 电能。计算器输入年运行小时、平均流量与电价，分别计算两种方式的能耗费用和变频投资的简单回本周期。

泵电机需要哪些保护？

泵电机需要过载（热）、短路、缺相和接地保护，潜水泵还需干转保护。保护器件遵循 IEC 60947 与 GB/T 14048，启动器集成接触器 + 热继电器。计算器 BOM 按泵功率配带集成保护的软启动器或变频器。

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