HET 75kVA High Voltage Exciter Transformer Specifications

Triple-Voltage Output Transformer

This single-phase 75kVA exciter transformer features three selectable high-voltage outputs with ONAN cooling, designed for precision electrical testing applications up to 25kV.

Electrical Parameters

Low Voltage Side

• Voltage: 0.38kV

• Current: 197.4A

High Voltage Side

Key Technical Features

• Rated Capacity: 75kVA

• Impedance Voltage: <5%

• Cooling Method: ONAN (Oil Natural Air Natural)

• Frequency: 50Hz

Advanced Protection System

Safety Components

• Electrostatic shield between HV windings

• Piezoresistors on all HV outputs

• Zinc oxide arresters for ground connection

• 25kV corona-free bushings with rings

Structural Protection

• Steel housing with wheel-mounted design

• Shell-type oil tank with conservator

• Fiber glass bushings for HV terminals

• Porcelain bushings for LV connections

Insulation Technology

1. Cylinder Winding Design: With inter-turn insulation layers

2. Balanced Electrostatic Field: Uniform top/bottom voltage distribution

3. Compound Insulation Tube: Minimizes partial discharge

4. Oil Immersion System: 25# transformer oil maintains dielectric strength

Performance Guarantees

• 25kV corona-free operation

• Flashover protection from external surges

• Power frequency withstand: 10kV/1min

• Isovolumetric capacitance core design

Design Specifications

Typical Applications

• High-voltage laboratory testing

• Electrical equipment diagnostic systems

• Transformer excitation testing

• Insulation resistance measurement

• Power system research and development

The HET 75kVA exciter transformer delivers precise high-voltage outputs with multiple tap options, combining advanced insulation technology with robust safety features for demanding electrical testing environments.