SCB13 Dry-Type Transformer Selection Guide for Export Projects

Introduction

SCB13 dry-type transformers are often used in indoor substations, commercial buildings, industrial plants and auxiliary power systems. Export buyers should select them by rating, losses, insulation quality, ventilation and project approval documents.

This guide is written for overseas buyers, EPC contractors, consultants and local utility reviewers. It uses IEC 60076-11, IEC 60076-1, project efficiency requirements and local utility or building approval rules 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
kVA sizing	Must match load profile and future expansion
Voltage ratio	Must match incoming and downstream distribution voltage
Loss level	Affects operating cost and project efficiency target
Partial discharge	Key quality indicator for cast resin insulation
Ventilation and enclosure	Determine thermal reliability in indoor rooms

2. RFQ Data to Provide

• Rated kVA, voltage ratio, frequency and vector group.
• Guaranteed losses and impedance.
• Partial discharge limit and temperature rise class.
• Indoor room conditions, altitude and ambient temperature.
• Enclosure IP rating and fan-assisted cooling requirement.
• Routine test report and FAT requirement.

3. Supplier Documents to Request

• Technical datasheet.
• General arrangement and terminal drawing.
• Partial discharge and routine test report.
• Temperature relay wiring diagram.
• Installation and ventilation guide.
• Compliance matrix against IEC and project specification.

4. Engineering Review Checklist

Review item	Why it matters
Load profile	Prevents oversizing or thermal overload
Partial discharge	Confirms insulation manufacturing quality
Ventilation	Dry-type transformers need room airflow
Enclosure	Balances protection and cooling
Documentation	Needed for consultant and utility approval

5. Reference Standards and Local Approval

Use IEC 60076-11 for dry-type transformer requirements and IEC 60076-1 for general transformer data. Local building or utility rules may define room, fire and connection requirements.

Buyer Recommendation

Specify SCB13 by project data, not only by model name. The RFQ should include kVA, voltage, losses, partial discharge, room conditions, enclosure and required test documents.