Product Overview

The HET 30kVA exciter transformer offers three selectable voltage outputs (2.5kV/1.5kV/0.75kV) in a single compact unit. With ultra-low impedance (<3%) and ONAN cooling, it's ideal for precision testing across multiple voltage requirements while complying with IEC 60076-11 standards.

Electrical Specifications

Advanced Design Features

Triple-Voltage Operation

• Tap-selected outputs without external reconfiguration

• Common LV winding with multiple HV winding taps

• Auto-synchronized voltage switching

Thermal Management

• Continuous duty cycle matching reactor operation

• ONAN cooling with 25# transformer oil

• Optimized oil flow through shell-type tank design

Protection Systems

1. Overvoltage Protection

• Piezoresistors on all HV output taps

• Zinc oxide arresters (15kA rating) on I/O terminals

• Dual ground reference points for operator safety

2. Insulation Control

• Electrostatic shielding between all windings

• 2.5kV corona-free fiberglass bushings

• Inter-turn barriers (1mm Nomex®) for flashover prevention

Mechanical Construction

Enclosure Features

• 14-gauge steel housing with corrosion-resistant coating

• Integrated wheel base (4× 200mm industrial casters)

• Shell-type oil tank with 35L 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 precision area matching (±2%)

• Electrostatic compensation for uniform voltage distribution

• Compound insulation tubes with partial discharge

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• Isovolumetric capacitance cores in all HV bushings

Installation & Maintenance

Commissioning Requirements

• Minimum 800mm clearance from grounded surfaces

• Initial oil BDV ≥40kV (2.5mm gap)

• Pre-operation IR ≥5,000MΩ

Service Schedule

• Monthly: Visual inspection of bushings and corona rings

• Bi-annual: Oil dielectric strength testing

• Annual: Winding resistance measurement

Typical Applications

• Multi-voltage cable testing systems

• Transformer factory acceptance testing

• Rotating machine insulation diagnostics

• Research labs requiring flexible test voltages