HET 750kVA Variable Frequency Exciter Transformer Technical Specifications

1. Electrical Parameters

1.1 High Voltage Winding

1.2 Low Voltage Winding

• Voltage Options: 2×450V / 2×500V / 2×550V

• Current Rating: 2×750A

2. Thermal Management

• Cooling Method: ONAN (Oil Natural Air Natural)

• Insulation Oil: Grade A, 25# transformer oil

• Continuous Operation: 60 minutes at full load

3. Core Construction

3.1 Magnetic Core

• Shell-type oil-immersed design

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

• Low Bm value for reduced eddy current losses

3.2 Winding Configuration

• Independent HV winding design

• Double-coil construction with copper conductors

• Electrostatic shielding between windings

• Built-in measuring coil for HV voltage monitoring

4. Safety Features

• Clearance Design: Prevents partial discharge/corona

• Oil Monitoring:

• Expansion tank with moisture absorber

• Oil temperature thermograph

• Visual oil level indicator

• Transport Safety: Component layout optimized for shipping

5. Performance Guarantees

• Stable output across 25-400Hz range

• No measurable corona at rated voltage

• ≤5pC partial discharge at 4.2kV

6. Compliance Standards

• IEC 60076-1 (Power Transformers)

• IEEE C57.12.00 (General Requirements)

• EN 50588-1 (Mobile Test Equipment)