HET 75kVA Exciter Transformer Technical Specifications

Multi-Tap High Voltage Transformer

The HET 75kVA exciter transformer features three output voltage configurations with single-phase design and ONAN cooling, specifically engineered for precision high-voltage testing applications.

Electrical Specifications

• Rated Capacity: 75kVA

• Impedance Voltage: <5%

• Cooling Method: ONAN (Oil Natural Air Natural)

Advanced Protection System

Multi-Layer Safety Design

• Electrostatic Shield: Between HV and LV windings for potential control

• Zinc Oxide Arresters: Ground-connected input/output terminals

• Piezoresistors: Installed on each HV output for surge protection

• 6kV Corona-Free: LV bushings with corona rings

Structural Features

Enclosure

• Steel housing with wheel-mounted mobility

• Shell-type oil tank with conservator

Termination System

• Porcelain bushings for LV connections

• Fiber glass bushings for HV terminals

• Voltage-grade specific bushings

Insulation Technology

1. Cylinder Winding: With inter-turn insulation layers

2. Balanced Design: Electrostatic shield ensures uniform top/bottom voltage distribution

3. Compound Insulation Tube: Reduces partial discharge and shields iron core

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

Operational Safety

• Prevents flashover from external potential surges

• Protects both main and minor insulation systems

• Isovolumetric capacitance core design

• Tested for power frequency withstand (10kV/1min)

Industrial Applications

• High-voltage laboratory testing facilities

• Electrical equipment diagnostic systems

• Power transformer excitation

• Insulation resistance testing

Design Advantages

This HET series exciter transformer combines precision voltage output with robust safety features, making it ideal for demanding high-voltage testing environments. All specifications are based on standard operating conditions at 60Hz frequency.