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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 $1,878,680
Smart O&M ROI · manual vs smart comparison
$10,269 annual saving
payback 5.5 yr · 3-yr ROI -45%
Assets
20 × 1000 kVA
Asset value
POA
Annual saving
$10,269
Payback
5.5 yr
3-yr ROI
-45%
📊 O&M cost comparison (annual, illustrative)
ItemManualSmart O&M
Routine O&MPOAPOA
Unplanned downtimePOAPOA
Annual subscription—POA
Total annual costPOAPOA
💰 Long-term economics (8% WACC, illustrative)
ParameterValue
5-yr NPV−$15,360
10-yr NPV$12,544
10-yr IRR12.7%
3-yr ROI (existing)-45%
🎯 Sensitivity — annual saving (illustrative)
ParameterValue
Failure rate 4% (low)$7,389
Failure rate 8% (base)$10,269
Failure rate 12% (high)$13,149
Outage cost $350/h (low)$8,541
Outage cost $500/h (base)$10,269
Outage cost $650/h (high)$11,997
📦 Equipment value basis (BOM, per asset)
EquipmentModelSpecQty
HV incoming panelKYN28A-12-630-315630 A / 31.5 kA · vacuum1
Main transformerS13-M-1000/101000 kVA · Oil-Immersed · Copper · S131
LV incoming panelGGD-16001600 A busbar · In 1443 A1
LV feeder panelGGD-1600distributes 6 circuits1
PFC capacitor bank150 kVARautomatic · GCK LV cabinet1
Cable branch box (LV)DFW-0.41-in / 4-out · 0.4 kV · 630 A1
Series reactor (detuned)CKSG-9.0/0.49.0 kVAR · 6% · 0.4 kV1
Main feeder cable (TX→LV)YJV 0.6/1kV 240 mm² ×44× 240 mm² Cu · ΔU 0.88% @ 60 m · $123.0/m4
Feeder cable — LV feeder circuit 1 (×6)YJV 120 mm²120 mm² Cu · 241 A · ΔU 1.2% · $68.8/m6
Branch trunk cable (LV → branch box 1)YJV 120 mm² ×22× 120 mm² Cu · 481 A · ΔU 1.2% · $68.8/m2
Main busbar (Cu)Cu 100×10100×10 · 2000 A rating · ref $118/mincluded
Grounding electrodeΦ20mm × 2.5m rodR₁ 39.6 Ω → 13 rod(s) ≤ 4 Ω13
📐 Single-line diagram
CT 60/5APT 10kV/100V50/5151NHV incomingKYN28A-12-630-315630 A / 31.5 kA · vacuumS13-M-1000/101000 kVAZ = 4%Oil-Immersed · Copper · S13kWhmeteringLV incomingGGD-16000.4 kV LV busbar100×10 Cu · 2000 ASPDPFC 150 kVAR+ detuned reactorLV feeder panel ×1 · 6 circuitsLV feeder circuit 1 · 241 AYJV 120 mm²LV feeder circuit 2 · 241 AYJV 120 mm²LV feeder circuit 3 · 241 AYJV 120 mm²LV feeder circuit 4 · 241 AYJV 120 mm²LV feeder circuit 5 · 241 AYJV 120 mm²LV feeder circuit 6 · 241 AYJV 120 mm²Grounding 13×Φ20mm×2.5m rodCable branch box DFW-0.4 ×1 (1-in / 4-out)
LEGENDBreaker (52)DisconnectorCT (current transformer)PT (voltage transformer)50/51Protection relay 50/51/51N/87kWhMeter (kWh)SPD (surge protection)Transformer
⚙️ Electrical schematic (protection & metering)
ELECTRICAL SCHEMATIC - PROTECTION & METERING10 kV / 0.4 kV - 1000 kVA - secondary circuits (schematic)INCOMING 10 kV60/5Aprotection CTQF50/5151Novercurrent / earth-fault10kV/100Vbus PT (voltage)TRANSFORMER1000 kVAZ = 4%kWhrevenue meteringLV QF0.4 kV LV BUSSPDPFC150 kvar.../5ALV feeder circuit 1 - 241 A50/51.../5ALV feeder circuit 2 - 241 A50/51.../5ALV feeder circuit 3 - 241 A50/51.../5ALV feeder circuit 4 - 241 A50/51.../5ALV feeder circuit 5 - 241 A50/51.../5ALV feeder circuit 6 - 241 A50/51
⛳ Grounding grid layout
SUBSTATION GROUNDING GRID LAYOUTsite 12 m x 8 m - ring earth electrode (schematic)TRANSFORMERR1R2R3R4R5R6R7R8R9R10R11R12R1312 mGround rods: 13 x dia 20 mm x 2.5 m copper-bonded steelRod spacing: 5 m (= 2 x rod length, ring electrode)Target resistance: <= 4 Ω (measure after installation)Standard: IEC 62305 / IEEE 80 (earthing design) - indicative layout
🔌 Cable schedule & routing
CABLE SCHEDULEIDFromToCable (model / spec)LengthC0TransformerLV panelYJV 0.6/1kV 240 mm² (1443 A)60 mC1LV panelLV feeder circuit 1YJV 120 mm² (241 A)60 mC2LV panelLV feeder circuit 2YJV 120 mm² (241 A)60 mC3LV panelLV feeder circuit 3YJV 120 mm² (241 A)60 mC4LV panelLV feeder circuit 4YJV 120 mm² (241 A)60 mC5Branch boxLV feeder circuit 5YJV 120 mm²60 mC6Branch boxLV feeder circuit 6YJV 120 mm²60 mROUTING (schematic)LV PANELL1L2L3L4L5L6L7Cable lengths are indicative (run-length based); confirm on site before installation.
🗄 Switchgear arrangement
SWITCHGEAR ARRANGEMENTpanel lineup (front view, schematic)HV INCOMINGKYN28A-12-630-315LV INCOMINGGGD-1600FEEDERGGD-1600PFC150 kvarBRANCH BOXDFW-0.45 panel(s) - each 128 mm (typical)Clearance / aisle per IEC 61936-1 - layout indicative
🛡 Protection configuration
PROTECTION CONFIGURATION10 kV / 0.4 kV · 1000 kVA · protection zones (schematic)INCOMING 10 kVCT 75/5A505151Novercurrent / earth-faultQFTRANSFORMER1000 kVA · Z=4%49thermal overloadCT 1500/5A505151NLV incoming protectionQF0.4 kV LV BUSCT 250/5A50/5151NLV feeder circuit 1241 ACT 250/5A50/5151NLV feeder circuit 2241 ACT 250/5A50/5151NLV feeder circuit 3241 ACT 250/5A50/5151NLV feeder circuit 4241 ACT 250/5A50/5151NLV feeder circuit 5241 ACT 250/5A50/5151NLV feeder circuit 6241 AProtection layout & CT ratios are schematic / illustrative final settings per IEC 60255 / IEEE 242.
📋 Protection settings
CircuitProtectionSettingTimeStandard
HV incoming 10 kV50 instantaneous462 AinstIEC 60255-151 / IEEE 242
HV incoming 10 kV51 overcurrent69 A0.5 sIEC 60255-151 / IEEE 242
HV incoming 10 kV51N earth-fault12 A0.5 sIEC 60364-4-41
Transformer 1000 kVA49 thermal overload95% of ratedalarm/tripIEC 60076-7 / IEEE C57.91
LV incoming 0.4 kV50 instantaneous11547 AinstIEC 60947-2
LV incoming 0.4 kV51 overcurrent1732 A0.3 sIEC 60947-2 / IEC 60255
LV incoming 0.4 kV51N earth-fault289 A0.3 sIEC 60364-4-41
LV feeder circuit 150/51/51N (MCCB)Ir 265 A · Im 1925 A · Ig 48 A0.1 s (grading)IEC 60947-2 / IEC 60255
LV feeder circuit 250/51/51N (MCCB)Ir 265 A · Im 1925 A · Ig 48 A0.1 s (grading)IEC 60947-2 / IEC 60255
LV feeder circuit 350/51/51N (MCCB)Ir 265 A · Im 1925 A · Ig 48 A0.1 s (grading)IEC 60947-2 / IEC 60255
LV feeder circuit 450/51/51N (MCCB)Ir 265 A · Im 1925 A · Ig 48 A0.1 s (grading)IEC 60947-2 / IEC 60255
LV feeder circuit 550/51/51N (MCCB)Ir 265 A · Im 1925 A · Ig 48 A0.1 s (grading)IEC 60947-2 / IEC 60255
LV feeder circuit 650/51/51N (MCCB)Ir 265 A · Im 1925 A · Ig 48 A0.1 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
ParameterFormulaValue
Connected loadP = sum(kW)900 kW
Demand factorKd1
Demand powerPd = P x Kd900 kW
Power factorcos(phi) before -> after0.90 -> 0.95
Design apparent powerSd = Pd / cos(phi)947 kVA
Transformer loadingSd / Srated95%
2. Short-circuit calculation
Standard: IEC 60909
ParameterFormulaValue
System impedance (pu)Zs = S / Ssc0.20% (on 1000 kVA base)
Transformer impedanceZt = Z%4%
Total impedanceZ = Zt + Zs4.20%
LV prospective IscIsc = In / Z34.4 kA
HV prospective IscIsc = Ssc / (sqrt(3) x V)28.9 kA
Breaking checkIcu >= IscLV 36 kA (1.0x margin) PASS
3. Voltage drop
Standard: IEC 60364-5-52 Annex G
ParameterFormulaValue
Main feederdU = sqrt(3) x I x L x R / V240 mm² · dU 0.88% @ 60 m
Limitmax 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)
ParameterFormulaValue
Required compensationQc = Pd x (tan1 - tan2)140 kvar
PFC bankstandard step150 kvar
Detuned reactorp = 6%9.0 kvar @ 6% (anti-resonance)
5. Grounding
Standard: 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 ohm
ParameterFormulaValue
Single rod resistanceR1 = rho/(2 x pi x L) x ln(4L/d)39.6 ohm
Rods requiredn = R1 / (target x 0.8)13 rod(s) <= 4 ohm
Rod specdia x length20 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)
SECONDARY CONTROL & SIGNAL CIRCUIT0.4 kV circuit breaker close/trip + indication + interlock (TYPICAL)+control supplyCS (close)interlock52Cclose coil-TC (trip)prot trip52Ttrip coilSIGNAL (indication)52a (closed)REDbreaker closed-TYPICAL CIRCUITStandard control/signal scheme for LV feeder circuit 1.Project detailing required (wiring, terminal assignment).
🔩 Terminal strip (typical)
TERMINAL STRIP (TYPICAL)X1 secondary wiring terminals (typical project detailing required)TerminalFunctionWireX1:1control supply L+1.5 mm²X1:2control supply L-1.5 mm²X1:3close command1.5 mm²X1:4trip command1.5 mm²X1:5breaker 52a status1.5 mm²X1:6breaker 52b status1.5 mm²X1:7trip circuit healthy1.5 mm²X1:8earth / shield2.5 mm²
📏 Standard basis (依据标准)
TopicStandard
Reliability dataIllustrative industry-typical failure and downtime values — no specific standard
Condition monitoringIEC 61557 / IEEE 3004 series (monitoring & protection) — informational basis
TransformersIEC 60076 · GB/T 6451 — power transformers
🧮 How it was calculated
1. Per-asset value ≈ $93,934 (1000 kVA transformer + switchgear) × 20 assets = $1,878,680 total
2. Manual O&M: routine $28,180 (1.5%) + downtime $19,200 = $47,380/yr
3. Downtime (manual): 20 × 8% = 1.6 failures × 24 h × $500/h
4. Smart O&M: routine $16,908 (0.9%) + downtime $13,440 (−30% failures) + subscription $6,763 = $37,111/yr
5. Annual saving = $10,269 · investment $56,360 → payback 5.5 yr
6. 3-year ROI = (saving × 3 − investment) ÷ investment = -45%
📋 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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