Electrical Engineering Calculators & Sizing Tools
Formally verified preliminary design calculators for heavy industrial electrical distribution, 33kV/11kV substations, power factor correction, standby diesel generation, earthing systems, busbars, solar PV, indoor lighting, motor starters, and UPS battery banks.
33kV / 11kV Substation Transformer Capacity & Fault Sizing
Aggregates maximum demand, selects standard IS 2026 kVA commercial ratings, and computes prospective secondary short-circuit fault levels.
HT/LT Cable Ampacity & Resistive-Inductive Voltage Drop
Calculates full-load current and 3-phase AC voltage drop in XLPE cables. Evaluates compliance against feeder (≤3%) and branch (≤5%) design limits.
APFC Capacitor Bank kVAR Sizing & Surcharge Screening
Computes required reactive compensation to achieve target power factor (0.99), modular steps, and indicative Discom low-PF penalty savings.
Preliminary Industrial DG Set Generator Capacity Estimator
Sizes diesel generator kVA capacity from base linear and motor loads, accounts for starter inrush, and selects standard OEM ratings.
Substation Main Earthing Conductor Strip Sizing Tool
Computes adiabatic short-circuit thermal withstand cross-section for Galvanized Iron, Copper, and Aluminum flats with configurable corrosion allowances.
HT/LT Busbar Sizing & Short-Circuit Thermal Stress
Dimensions continuous ampacity and short-circuit thermal withstand for Al/Cu flats. Calculates peak dynamic electrodynamic forces on supports.
Commercial Rooftop Solar PV Array & Inverter Sizing
Estimates required DC solar capacity (kWp), module quantities, commercial string inverter rating, monthly generation yields, and CO2 offsets.
Indoor Lighting Illumination Lux Level & Lumen Method
Calculates luminaire quantities using zonal cavity RCR and utilization factors. Verifies maintained working-plane Lux and ECBC LPD compliance.
Industrial Induction Motor Starter & Feeder Protection
Computes motor FLA, sizes Main/Delta/Star contactors for DOL and Star-Delta, sets overload relay bands, and screens backup MCCB ratings.
Battery Bank & Online Industrial UPS Sizing Tool
Calculates battery bank Ah capacity with IEEE 485 aging reserves, determines series/parallel string arrangements, and sizes float chargers and UPS kVA.
These calculations provide preliminary engineering screening and feasibility sizing. Final procurement, electrical safety protection coordination, and statutory utility approvals must be verified by a licensed Chartered Engineer.