Power Distribution System Design & Pricing Calculator
Standard
IEC
NEC
GB
Transformer type
*
Oil-Immersed
Dry-Type
Amorphous Alloy
Box-Type Substation
Total connected load (kW)
*
HV voltage (kV)
*
10 kV
35 kV
20 kV
6 kV
12 kV
LV voltage (kV)
*
0.4 kV
0.69 kV
0.48 kV
0.38 kV
0.22 kV
Average power factor
*
Circuits (feeders)
Target power factor
Demand factor
Upstream short-circuit Ssc (MVA)
Soil resistivity ρ (Ω·m)
Feeder run length (m)
Redundancy
Single unit
N+1 (dual, 100% backup)
Winding
Copper
Aluminum
Efficiency / series
S13 / SCB13
S9
S11
S20
S22
SCB10
SCB11
SCB14
SCB15
HV switchgear type
Circuit breaker panel (KYN28A)
Ring main unit (SF6, 10 kV)
Cable branch boxes
Auto — add DFW-0.4 when >4 circuits
None
Advanced parameters
Defaults match the standard design baseline — adjust for site-specific conditions.
Grounding rod length (m)
Grounding rod diameter (mm)
Grounding target (Ω)
4 Ω
1 Ω
10 Ω
25 Ω (NEC)
Cable conductor
Copper
Aluminum
Cable phase
3-phase
1-phase
Max voltage drop (%)
3%
2%
5%
Detuned reactor rate (%)
6%
7%
12%
14%
Smart Monitoring & Control
Add SCADA / protection IED / DC panel / metering to the BOM. None keeps the design unchanged.
Automation tier
None
Basic
Complete
Protocol
Modbus RTU/TCP
IEC 60870-5-104
IEC 61850 (GOOSE/SV)
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Complete Design
Enter parameters to see the full design.
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