HET 250kVA/7kV Exciter Transformer - Ultra-Low Noise Testing

Technical Specifications

Key Features

Precision Electrical Performance

• Industry-leading ≤3pC partial discharge

• Dual-voltage output (4kV/7kV)

• Electrostatic shielding between windings

• Isovolumetric capacitance core

Advanced Protection System

• Zinc oxide arresters on all terminals

• Piezoresistors for each HV output

• 7kV corona-free bushings

• Fiberglass insulation with corona rings

Robust Mechanical Design

• Steel housing with integrated wheels

• Oil-immersed shell-type construction

• DQ130-30 silicon steel core

• Transport-optimized layout

≤3pCPartial Discharge

7kVMax Output

<4%Impedance

Insulation System

1. Cylinder-type winding with balanced area distribution

2. Turn-to-turn insulation layers

3. Compound insulation tube skeleton

4. Electrostatic compensation shielding

Monitoring & Safety

• Oil temperature thermograph

• Visual oil level indicator

• Moisture absorber in expansion tank

• Flashover prevention design

Typical Applications

• Partial discharge measurement systems

• Transformer factory acceptance tests

• High-voltage cable qualification

• Research laboratory applications

Engineered for sensitive measurements, the HET 250kVA/7kV sets new standards in low-noise high-voltage testing with its exceptional ≤3pC partial discharge performance and dual-voltage flexibility.