HET 600kVA/35kV Multi-Tap Mobile Test Transformer

1. Electrical Specifications

1.1 Voltage/Current Ratings

1.2 Dielectric Test Capability

• Withstands 1.1× rated voltage for 1 minute

• Partial discharge <5pC at rated voltage

2. Mobile Mechanical Design

• Enclosure: Steel housing with integrated wheels

• Oil Tank: Shell-type construction

• Bushing Configuration:

• HV bushings mounted on oil tank

• Porcelain bushings for LV connections

• Voltage-grade specific terminal bushings

3. Advanced Insulation System

3.1 Bushing Technology

• Isovolumetric capacitance core design

• Fiberglass-reinforced terminal insulation

• Corona rings for 35kV corona-free operation

3.2 Winding Structure

• Cylinder-type winding with balanced area design

• Compound insulation tube skeleton

• Inter-turn insulation layers

• Electrostatic shielding between windings

4. Protection Systems

5. Oil Management

• Oil conservator maintains core immersion

• Expansion tank accommodates thermal cycling

• 25# transformer oil (Grade A)

6. Compliance Standards

• IEC 60296 (Transformer Oil Standards)

• IEEE C57.12.90 (Test Procedures)

• EN 60076 (Power Transformer Requirements)