SUBSTATION & HT/LT LOAD ENGINE
Connected Load & Transformer Sizing Calculator.
Audit your facility connected equipment, apply diversity and power factor parameters, and determine the recommended distribution transformer capacity (kVA), busbar current, and circuit breaker ratings.
Step 1: Facility Load Audit
Connected Equipment Parameters
Electric Motors, Pumps & Compressors
75kW (~101 HP)
HVAC, Chillers & Air Conditioning
35kW (~29 TR)
Heavy Industrial Machinery & Heaters
45kW
Lighting, Servers & Auxiliary Power
15kW
Total Connected Electrical Load:170 kW
Standard Transformer Rating
250kVA
11kV / 433V Step-Down Distribution Transformer (IS 2026)Design Loading Factor60%Optimal efficiency zone (65%–80%)
Maximum Demand128 kW(150 kVA)
LT Secondary Current348 Aat 415V 3-Phase
HT Primary Current13.1 Aat 11kV Grid Feed
Recommended Incomer Circuit Breaker630A Rating (Moulded)
KSEB Supply Voltage11kV HT Bulk Supply
Substation Engineering Recommendations
Main LT Panel Architecture: Requires 630A Moulded Case Circuit Breaker (MCCB) Microprocessor Release with electrical/mechanical interlocking and APFC capacitor bank interface.
KSEB Substation Requirement: Outdoor 2-pole/4-pole structure with 11kV Gang Operated Air Break (GOAB) Switch and Drop Out (DO) Fuses.
Earthing Grid: Dedicated 4-pit copper/chemical earthing system (2 for neutral, 2 for transformer body and lightning arresters) with <1.0 Ohm impedance.