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智能运维 ROI 计算器

将人工运维与带预测性维护的智能状态监测进行对比——针对您的设备资产，计算日常成本、非计划停机、年度节省、投资回收期和 3 年 ROI。

开始计算智能电力运维解决方案

为什么使用此计算器

智能运维利用状态监测和预测性维护来降低日常巡检成本和非计划停机。此计算器针对您的设备资产对比人工运维与智能运维，并估算节省、投资回收期和 ROI——基于保守且清晰说明的假设。

Worked Examples

Example 1 — 20 × 1 MVA Asset Fleet (Smart O&M ROI) · FOB $1,781,760

Smart O&M ROI · manual vs smart comparison

$10,036 annual saving

payback 5.3 yr · 3-yr ROI -44%

Assets

20 × 1000 kVA

Asset value

POA

Annual saving

$10,036

Payback

5.3 yr

3-yr ROI

-44%

📊 O&M cost comparison (annual, illustrative)

Item	Manual	Smart O&M
Routine O&M	POA	POA
Unplanned downtime	POA	POA
Annual subscription	—	POA
Total annual cost	POA	POA

💰 Long-term economics (8% WACC, illustrative)

Parameter	Value
5-yr NPV	−$13,381
10-yr NPV	$13,891
10-yr IRR	13.5%
3-yr ROI (existing)	-44%

🎯 Sensitivity — annual saving (illustrative)

Parameter	Value
Failure rate 4% (low)	$7,156
Failure rate 8% (base)	$10,036
Failure rate 12% (high)	$12,916
Outage cost $350/h (low)	$8,308
Outage cost $500/h (base)	$10,036
Outage cost $650/h (high)	$11,764

📦 Equipment value basis (BOM, per asset)

Equipment	Model	Spec	Qty
HV incoming panel	KYN28A-12-630-315	630 A / 31.5 kA · vacuum	1
Main transformer	S13-M-1000/10	1000 kVA · Oil-Immersed · Copper · S13	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	150 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-9.0/0.4	9.0 kVAR · 6% · 0.4 kV	1
Main feeder cable (TX→LV)	YJV 0.6/1kV 240 mm² ×4	4× 240 mm² Cu · ΔU 0.88% @ 60 m · $123.0/m	4
Feeder cable — LV feeder circuit 1 (×6)	YJV 120 mm²	120 mm² Cu · 241 A · ΔU 1.2% · $68.8/m	6
Branch trunk cable (LV → branch box 1)	YJV 120 mm² ×2	2× 120 mm² Cu · 481 A · ΔU 1.2% · $68.8/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

📐 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	95% of rated	alarm/trip	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
LV feeder circuit 1	50/51/51N (MCCB)	Ir 265 A - Im 1925 A - Ig 48 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
LV feeder circuit 2	50/51/51N (MCCB)	Ir 265 A - Im 1925 A - Ig 48 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
LV feeder circuit 3	50/51/51N (MCCB)	Ir 265 A - Im 1925 A - Ig 48 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
LV feeder circuit 4	50/51/51N (MCCB)	Ir 265 A - Im 1925 A - Ig 48 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
LV feeder circuit 5	50/51/51N (MCCB)	Ir 265 A - Im 1925 A - Ig 48 A	0.1 s (grading)	IEC 60947-2 / IEC 60255
LV feeder circuit 6	50/51/51N (MCCB)	Ir 265 A - Im 1925 A - Ig 48 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)	900 kW
Demand factor	Kd	1
Demand power	Pd = P x Kd	900 kW
Power factor	cos(phi) before -> after	0.90 -> 0.95
Design apparent power	Sd = Pd / cos(phi)	947 kVA
Transformer loading	Sd / Srated	95%

2. Short-circuit calculation

Standard: IEC 60909

Parameter	Formula	Value
System impedance (pu)	Zs = S / Ssc	0.20% (on 1000 kVA base)
Transformer impedance	Zt = Z%	4%
Total impedance	Z = Zt + Zs	4.20%
LV prospective Isc	Isc = In / Z	34.4 kA
HV prospective Isc	Isc = Ssc / (sqrt(3) x V)	28.9 kA
Breaking check	Icu >= Isc	LV 36 kA (1.0x 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 0.88% @ 60 m
Limit	max 3%	within limit
Transformer volt. reg.	dU ~ loading x Z% x sin(phi)	1.2% at full load

4. Reactive power / harmonics

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

Parameter	Formula	Value
Required compensation	Qc = Pd x (tan1 - tan2)	140 kvar
PFC bank	standard step	150 kvar
Detuned reactor	p = 6%	9.0 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)

📏 Standard basis (依据标准)

Topic	Standard
Reliability data	Illustrative industry-typical failure and downtime values — no specific standard
Condition monitoring	IEC 61557 / IEEE 3004 series (monitoring & protection) — informational basis
Transformers	IEC 60076 · GB/T 6451 — power transformers

🧮 How it was calculated

1. Per-asset value ≈ $89,088 (1000 kVA transformer + switchgear) × 20 assets = $1,781,760 total

2. Manual O&M: routine $26,726 (1.5%) + downtime $19,200 = $45,926/yr

3. Downtime (manual): 20 × 8% = 1.6 failures × 24 h × $500/h

4. Smart O&M: routine $16,036 (0.9%) + downtime $13,440 (−30% failures) + subscription $6,414 = $35,890/yr

5. Annual saving = $10,036 · investment $53,453 → payback 5.3 yr

6. 3-year ROI = (saving × 3 − investment) ÷ investment = -44%

📋 Design notes

O&M mode: omMode (smart) indicates your current baseline; the calculator always compares manual vs smart O&M so you can see the achievable saving regardless of your starting point.

Illustrative assumptions: O&M cost rates (1.5% / 0.9% of asset value), the 30% failure-reduction benefit and 3% monitoring investment are industry-typical planning values, not guarantees. Actual savings depend on your failure profile and site conditions.

Not a performance warranty: Predictive maintenance reduces, but cannot eliminate, unplanned outages. ROI figures are planning estimates.

Not economical at low failure rates: If your failure rate is already low, the monitoring investment may not pay back — the calculator shows a negative saving in that case.

Scope: This is a commercial O&M comparison tool — it does not design the monitoring system. Contact us for a SCADA / condition-monitoring scope tailored to your assets.

计算过程说明

估算原理

日常运维按资产价值的百分比建模（人工 1.5% vs 智能 0.9%）。非计划停机 = 故障次数 × 持续时间 × 每小时成本，预测性维护可将故障次数保守降低 30%。年度节省 = 人工成本 − 智能成本；投资回收期 = 监测投资 ÷ 年度节省。

适用标准

可靠性数据为行业典型参考值，并非标准。监测依据参考 IEC 61557 和 IEEE 3004 系列（监测与保护）以及变压器相关的 IEC 60076。

常见问题

电力设备的预测性维护是什么？

预测性维护用状态监测——油中溶解气体（DGA）、局部放电、温度、振动——在故障前发现隐患。相比事后维修，它可减少 30-50% 非计划停机、降 10-25% 维护成本。计算器对比人工与状态监测运维成本。

智能运维监测的 ROI 是多少？

智能运维典型 1-3 年回本，主要来自避免停机（一次变压器故障的停电与更换损失可达 5-50 万美元）和降低人工。计算器对电力设备群保守估算停机节省、ROI 与回本。

变压器最重要的状态监测参数有哪些？

油浸式变压器最关键的是 IEC 60599 的油中溶解气体分析（DGA）检测早期故障，再加油温、微水和局部放电。干式以温度和局部放电为主。计算器按覆盖这些参数的监测方案建模。

非计划停机实际损失多少钱？

非计划停机损失 = 停产损失 + 维修费 + 可能的罚款。流程工厂停产一天可损失 1-50 万美元不等。预测性维护目标是减少 30-50% 此类事件。计算器用你的停机成本与频次估算节省。

预防性维护和预测性维护有什么区别？

预防性维护按固定周期检修、不问状态，常造成过度维护。预测性维护仅在状态数据显示劣化时干预，精准施策、降低成本，对设备群 ROI 更高。计算器对从计划性转向状态维护的成本变化建模。

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