Product Overview

The HET 30kVA exciter transformer delivers flexible testing capabilities with dual-frequency operation (50Hz/150Hz) and 2kV/1kV voltage outputs. Engineered with ultra-low impedance (<3%) and advanced electrostatic shielding, it complies with IEC 60076-11 for high-precision test applications.

Electrical Specifications

Key Features

Dual-Frequency Operation

• Optimized for both power frequency (50Hz) and intermediate frequency (150Hz) testing

• Special winding design to minimize losses at higher frequencies

Thermal Performance

• ONAN cooling with 25# transformer oil

• Continuous operation at 100% rated capacity

• Winding temperature rise ≤65K

Protection Systems

1. Overvoltage Protection

• Piezoresistors on all HV outputs

• Zinc oxide arresters (IEC 60099-4 compliant)

• Ground-connected via 10kA surge arresters

2. Insulation Control

• Electrostatic shield layer between HV/LV windings

• 2kV corona-free fiberglass bushings

• Isovolumetric capacitance cores for stable voltage distribution

Mechanical Design

Enclosure Features

• Steel housing with corrosion-resistant coating

• Wheel-mounted (4× industrial casters)

• Shell-type oil tank with 40L conservator

Terminal Configuration

• LV terminals: Porcelain bushings

• HV terminals: Fiberglass-reinforced epoxy bushings

• Corona rings on all HV bushings

Winding Technology

• Cylinder-type winding with balanced capacitance

• Electrostatic compensation shields

• Inter-turn insulation (1mm Nomex® layers)

• Compound insulation tube skeleton

Installation & Maintenance

Commissioning Requirements

• Minimum 1m clearance from grounded surfaces

• Oil dielectric strength ≥45kV before energization

• Initial insulation resistance ≥8,000MΩ

Service Schedule

• Monthly: Bushing inspection

• Quarterly: Oil testing (BDV, moisture)

• Annual: Winding resistance measurement

Typical Applications

• Power cable withstand testing at multiple frequencies

• Rotating machine insulation diagnostics

• Transformer impulse testing systems

• High-voltage component R&D testing