BARUNSWAY
IEC 60076 / IEEE C57 / NEC 450
Transformer Engineering Suite
Industrial Sizing · Thermal Modeling · Protection Coordination · TOC Analysis
Input Parameters
IEC 60076-7 / IEEE C57.91 Compliant
LIVE
Load
Transformer
Environment
Economics
System Type
Voltage (V) IEC 60076-1
Connected Load (kW)
Max Demand (kW)
Demand Factor
Ratio of max demand to connected load
Diversity Factor
Sum of individual max demands / actual max demand
Power Factor (cos phi)
Target PF
Largest Motor (kW)
For starting kVA and voltage dip calc
Motor Starting Method
Load Growth (%)
Continuous Load? NEC 450.3(B)
Transformer Type
Winding Material
Nameplate kVA
Impedance %Z IEC 60076-5
X/R Ratio
Typical: 7-12 for power transformers
Vector Group
No-Load Loss P0 (kW)
Load Loss Pk (kW)
CT Ratio HV
CT Ratio LV
Ambient Temp (C)
Altitude (m)
>1000m requires derating per IEC 60076-2
Cooling Mode
Insulation Class
THD Current (%)
K-Factor Required?
Harmonic Derating Active
Apply IEEE C57.110 K-factor derating
Harsh / Dusty Environment
Apply 2% derating for contamination
Altitude Derating
Auto-derate if altitude > 1000m
Energy Cost ($/kWh)
Operating Hours/Year
Transformer Cost ($)
Installation Cost ($)
Analysis Period (yr)
Discount Rate (%)
CO2 Factor (kg/kWh)
Grid average: ~0.4-0.6 kg CO2/kWh
Engineering Results
IEC 60076-7 Thermal Model and Protection Coordination
SAFE
Single-Line Diagram
Thermal Gradient Diagram
Diagnostics and Validation
IEC 60076-7 / IEEE C57.91 Limits
Protection Relay Settings
Calculated per IEEE C37.91 / IEC 61850
| Function | Element | Setting | Notes |
|---|
Protection Zone Diagram