Product Overview

The HET 30kVA exciter transformer provides three voltage ranges (20kV/10kV/5kV) with dual-frequency capability (50Hz/200Hz). Designed with electrostatic shielding and ONAN cooling, it meets IEC 60076-11 standards for precision high-voltage testing applications.

Electrical Specifications

Advanced Features

Triple-Voltage Operation

• Tap-selected outputs without manual reconfiguration

• Common LV winding with multi-tap HV design

• Automatic voltage stabilization during switching

Dual-Frequency Performance

• Optimized for both power frequency (50Hz) and intermediate frequency (200Hz) testing

• Special laminated core design to reduce eddy losses

Protection Systems

1. Overvoltage Protection

• Piezoresistors on all HV outputs

• Zinc oxide arresters (20kA rating, IEC 60099-4)

• Dual ground reference points for operator safety

2. Insulation Control

• 20kV corona-free fiberglass bushings

• Electrostatic shielding between all windings

• Isovolumetric capacitance cores in HV bushings

Mechanical Construction

Enclosure Features

• 12-gauge steel tank with ANSI 61 gray finish

• Quad-wheel base with locking casters (250mm)

• Shell-type oil tank with 50L conservator

Terminal Configuration

• LV terminals: High-creepage porcelain bushings

• HV terminals: Triple-tap fiberglass bushings

• All bushings feature dual corona rings

Winding Technology

• Cylinder-type windings with balanced capacitance

• Electrostatic compensation for uniform voltage gradient

• Inter-turn insulation (1.5mm Nomex® layers)

• Compound insulation tubes for partial discharge control

Installation & Maintenance

Commissioning Requirements

• Minimum 1.2m clearance from grounded objects

• Initial oil BDV ≥50kV (2.5mm gap)

• Pre-operation IR ≥10,000MΩ

Service Schedule

• Monthly: Bushing contamination inspection

• Quarterly: Oil dielectric strength testing

• Annual: Complete winding resistance test

Typical Applications

• Multi-voltage cable withstand testing

• GIS (Gas Insulated Switchgear) commissioning

• Transformer impulse testing systems

• High-voltage component research & development