HET 900kVA Dual-Voltage Exciter Transformer Technical Specifications

1. Electrical Parameters

1.1 High Voltage Winding

2. Thermal Management

• Cooling Method: ONAN (Oil Natural Air Natural)

• Insulation Oil: Grade A, 25# transformer oil

• Insulation Class: Class A

3. Core Construction

3.1 Magnetic Core

• Shell-type oil-immersed design

• Core Material: D0130-30 high-grade silicon steel

• Low Bm value for minimal core losses

3.2 Winding Configuration

• Dual-coil design with copper conductors

• Electrostatic shielding between HV/LV windings

• Integrated measuring coil for HV voltage monitoring

• Safety distances prevent partial discharge

4. Monitoring Systems

• Oil Management:

• Expansion tank with moisture absorber

• Oil temperature thermograph

• Visual oil level indicator

• Transport Design:

• Bushings and valves positioned for safe shipping

• Optimized conservator layout

5. Performance Features

• Stable output across 20-300Hz range

• Corona-free operation at rated voltage

• Partial discharge <5pC at 11.8kV

6. Compliance Standards

• IEC 60076-1 (Power Transformers)

• IEEE C57.12.90 (Test Code)

• EN 60076-11 (Dry-type Transformers)