2000kVA Dry-Type Transformer Ventilation Guide for EPC Projects

Introduction

A 2000kVA dry-type transformer releases substantial heat into the room. For overseas EPC projects, ventilation must be calculated from transformer losses, ambient temperature, altitude, enclosure design and allowed room temperature rise.

This guide is written for overseas buyers, EPC contractors, consultants and local utility reviewers. It uses IEC 60076-11, IEC 61936-1, mechanical ventilation design practice and local building requirements as the main technical language, with the final acceptance route defined by the project specification and local approval process.

1. Buyer Decision Points

Decision point	What to check before RFQ
Loss budget	No-load and load losses define heat to remove
Air path	Low inlet and high outlet improve heat removal
Fan logic	AF cooling and room fans need alarm and failure handling
Room layout	Clearance and cable trays must not block airflow
Temperature monitoring	Alarm and trip contacts protect the transformer

2. RFQ Data to Provide

• Guaranteed losses and temperature rise limit.
• Room ambient temperature and altitude.
• Transformer enclosure IP rating and fan option.
• Room dimensions, inlet/outlet location and ducting limits.
• Temperature relay output and BMS/SCADA interface.
• Required ventilation calculation or EPC review format.

3. Supplier Documents to Request

• Loss data sheet.
• General arrangement drawing.
• Temperature relay and fan wiring diagram.
• Ventilation assumption note.
• Installation and maintenance manual.
• Routine test and partial discharge test data.

4. Engineering Review Checklist

Review item	Why it matters
Airflow	Insufficient airflow causes overheating
Fan failure	Needs alarm where forced ventilation is relied on
Enclosure	High IP rating can reduce cooling
Dust control	Dirty filters reduce airflow
Room heat load	Other equipment may add heat

5. Reference Standards and Local Approval

Use IEC 60076-11 for dry-type transformer requirements and IEC 61936-1 for high-voltage installation guidance. Final room ventilation should be reviewed by the EPC mechanical or electrical designer.

Buyer Recommendation

Request loss data and ventilation assumptions before room construction. For 2000kVA dry-type units, late airflow corrections are more expensive than early design review.