Substation & Transformer Sizing
Calculate distribution transformer capacity, 11kV/415V full-load currents, ACB selection, and automatic PFI capacitor banks per Bangladesh utility standards.
Transformer Sizing & Amps Calculator
11/0.415kV Distribution SizingPFI Capacitor Bank Sizing Calculator
Reactive Power CompensationBusbar & Power Cable Sizing
Size copper/aluminum busbars for LT/HT switchgear panels and calculate cable cross-sections by load (kW/Amps) with installation derating and BNBC 2.5% voltage drop compliance.
Busbar Sizing & Ampacity Calculator
Copper & Aluminum Flat BarsCable Sizing by Load & Voltage Drop
BNBC 2020 & IEC 60364 SizingSolar PV & Battery Storage Sizing
Designed per Bangladesh SREDA Net-Metering Guidelines 2018 (up to 70% sanctioned load) and IEEE standards for rooftop solar arrays, on-grid inverters, and LiFePO4 battery banks.
Rooftop Solar PV Array & Inverter Sizing
SREDA Net Metering & GenerationSolar Battery Energy Storage Sizing (BESS)
LiFePO4 & Lead-Acid BackupMotor Starters & Substation Earthing
Determine Full Load Amps (FLA), starting currents, starter types (DOL, Star-Delta, Soft Starter, VFD), and IEEE 80 substation ground grid resistance.
Motor Full-Load Amps & Starter Sizing
DOL, Star-Delta, Soft Starter & VFDSubstation Earthing Resistance (IEEE 80)
Target R < 1.0 Ω VerificationStatutory Authorities & Regulations
Official regulatory frameworks governing electrical contractor licenses, substation clearances, grid codes, and net-metering in Bangladesh.
OCEI — Office of the Chief Electric Inspector
The statutory body under the Ministry of Power, Energy and Mineral Resources of Bangladesh responsible for technical approval, safety inspection, and contractor licensing.
- Electricity Act 2018 (বিদ্যুৎ আইন ২০১৮) & Electricity Rules 1937.
- Mandatory pre-energization inspection of all 11kV/33kV substations.
- Issue of ABC Electrical Contractor License & Supervisor Competency Certificates.
- Earth resistance certificate compliance (R < 1.0 Ω required for substations).
BNBC 2020 — Electrical Services (Part 8, Chapter 1)
The Bangladesh National Building Code sets statutory requirements for electrical room planning, transformer clearances, and wiring safety.
- Transformer Room: Minimum 1.2m front clearance and 0.75m rear/side clearance.
- 2-Hour fire-rated walls and doors for indoor oil-type substation rooms.
- Mandatory oil soak pit with crushed stone pebbles to absorb 100% oil capacity.
- Voltage drop limit: Maximum 2.5% from supply intake to final sub-circuit.
BPDB — Bangladesh Power Development Board
The apex national agency for power generation, transmission liaison, and distribution across designated national power zones.
- National Bulk Power Tariffs & Industrial Demand Charge Rules.
- Technical specifications for 33/11kV Distribution Transformers & Switchgear.
- Standard overhead line clearances for 11kV and 33kV distribution lines.
- Single Line Diagram (SLD) approval procedure for industrial grid connections.
BREB — Bangladesh Rural Electrification Board
Governing 80 Palli Bidyut Samities (PBS) across Bangladesh, supplying rural industries, agro-complexes, and economic zones.
- PBS Instruction 100 Series for consumer electrical installations.
- Spun Pre-stressed Concrete (SPC) Pole mounting standards (H-Frame).
- Drop Out Fuse (DOF) & Lightning Arrestor installation guidelines.
- Standard ratings for rural step-down transformers (50kVA–250kVA).
DPDC & DESCO — Dhaka Metropolitan Distribution
Distributing power across Dhaka North and South metropolitan areas with strict HT consumer connection guidelines.
- Mandatory PFI Plant maintaining cos φ ≥ 0.95 (penalty below 0.95).
- Net Metering Guidelines for industrial and commercial rooftop solar.
- Ring Main Unit (RMU) requirements for underground city cable loops.
- HT Metering Unit (CT/PT Class 0.2s) sealing and calibration protocol.
PGCB — Power Grid Company of Bangladesh
The sole national agency responsible for operating and expanding high-voltage transmission grids (132kV, 230kV, and 400kV).
- National Grid Code compliance for grid-tied power stations and major substations.
- Right of Way (ROW) and statutory vertical/horizontal ground clearances.
- Transmission tower foundation and insulator string safety factors.
- Optical Ground Wire (OPGW) and SCADA tele-protection standards.
SREDA — Sustainable & Renewable Energy Development
Formulating Bangladesh’s renewable energy frameworks, energy audit regulations, and net metering schemes.
- Net Metering Guidelines 2018 (up to 70% of consumer sanctioned load).
- Mandatory energy audits for designated high-consumption industrial plants.
- Technical standards for grid-tied solar inverters (IEC 62109, IEEE 1547).
- Standards for Battery Energy Storage Systems (BESS) integration.
BSTI — Bangladesh Standards & Testing Institution
The national standards authority establishing product certifications for electrical transformers, cables, and switchgear.
- BDS IEC 60076 series: Power and distribution transformers.
- BDS 900: PVC insulated copper and aluminum power cables.
- BDS IEC 60898: Miniature circuit breakers (MCB) for low voltage.
- Mandatory quality mark for electrical materials marketed in Bangladesh.
Technical Standards & SLD Guides
Engineering guidelines, testing forms, and architectural clearances compiled by SETB's design engineering team.
Engineering Reference Guidelines
Substation Testing Checklist
OCEI Pre-commissioning test forms (Megger, BDV, TTR, Contact Resistance).
Busbar Ampacity Master Matrix
Copper & Aluminum cross-sections, current density & temperature limits.
BNBC 2020 Substation Clearances
Room dimensions, fire barriers, soak pit volumes & cable trench depth.
Single Line Diagram (SLD) Checklist
Standard IEC symbols, protection relaying (50/51, 51N) & CT/PT ratios.
SREDA Net-Metering Interconnection Form
Bi-directional solar meter specifications & distribution utility sanction rules.
OCEI Earthing Test Protocol
3-Point Fall-of-Potential method form for verification of R < 1.0 Ω.
Need Expert Substation Design, Calculation, or Licensing Support?
Our senior engineers hold certified Class ABC Supervisor Competency Certificates from OCEI and provide turn-key electrical engineering, load approval, utility liaison, and pre-commissioning clearances across Bangladesh.