Product Overview

The HET 30kVA exciter transformer is engineered for precision testing across a wide frequency range (30-300Hz), delivering dual voltage outputs (1.5kV/0.35kV). With ONAN cooling and ultra-low partial discharge (<5pC), it supports continuous operation at full rated capacity.

Electrical Specifications

Thermal Performance

• Continuous operation at rated voltage/current

• Winding temperature rise: ≤65K

• Oil temperature rise: ≤55K

• Cooling method: ONAN (Oil Natural Air Natural)

Advanced Protection Systems

1. Overvoltage Protection

• Piezoresistors on all HV outputs

• Zinc oxide arresters (IEC 60099-4 compliant)

• Ground-connected via 15kA surge arresters

2. Insulation & Discharge Control

• 1.5kV corona-free HV bushings

• Electrostatic shield layer between windings

• Isovolumetric capacitance cores

Mechanical Design

Enclosure Features

• Steel housing with corrosion-resistant coating

• Wheel-mounted (4× industrial casters with brakes)

• Shell-type oil tank with 40L conservator

Terminal Configuration

• LV terminals: High-strength 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 (1.2mm Nomex® layers)

• Compound insulation tube skeleton

Installation & Maintenance

Commissioning Requirements

• Minimum 1m clearance from grounded surfaces

• Oil dielectric strength ≥45kV before use

• Initial insulation resistance ≥8,000MΩ

Service Schedule

• Monthly: Bushing inspection

• Quarterly: Oil testing (BDV, moisture)

• Annual: Winding resistance measurement

Typical Applications

• Variable frequency resonance testing systems

• Power cable partial discharge measurement

• Rotating machine insulation diagnostics

• Transformer factory acceptance tests