HET 90kVA Variable Frequency Exciter Transformer

High-Frequency High Voltage Solution

This 90kVA exciter transformer features unique wide-frequency operation (20-300Hz) and dual high-voltage outputs, designed for specialized testing applications requiring variable frequency excitation.

Electrical Parameters

Insulation System

• LV Winding: 5kV/1min withstand

• HV Winding: 50kV/60s withstand

• Cylinder winding with turn-to-turn insulation

• Electrostatic shield between windings

• Compound insulation tube skeleton

Key Technical Features

Frequency Characteristics

• Wide operating range: 20-300Hz

• Rated frequency: 22Hz

• Independent HV winding design

Cooling System

• ONAN cooling (Oil Natural Air Natural)

• Class A heat resistance

• 25# transformer oil

• Temperature limits: Winding ≤65K, Oil ≤55K

Structural Design

• Steel housing with wheels

• Shell-type oil tank with conservator

• 30kV corona-free bushings

• Sound level: 65dB

Protection System

1. Electrical Protection:

• Piezoresistors on HV outputs

• Zinc oxide arresters for grounding

• Fiber glass bushings with corona rings

2. Insulation Protection:

• Balanced electrostatic shielding

• Flashover prevention system

• Partial discharge reduction design

Performance Specifications

Typical Applications

• Variable frequency resonant testing

• Power transformer frequency response analysis

• High-voltage cable testing

• Rotating machine testing

• Specialized research applications

Safety Features

• 30kV corona-free guaranteed operation

• Thermal monitoring with automatic shutdown

• Protected against external potential surges

• Copper lead wire winding for reliability

The HET 90kVA variable frequency exciter transformer combines wide-frequency operation with high-voltage output capability, making it ideal for specialized testing applications requiring flexible frequency excitation.