Product Overview

The HET 15kVA/6kV Exciter Transformer is a high-efficiency, single-phase unit designed for precision high-voltage testing up to 6kV. Featuring ONAN cooling, ultra-low noise (<60db), and="" advanced="" electrostatic="" shielding="">IEC 60076-11 standards for test transformers.

Technical Specifications

Key Protection Systems

1. Overvoltage & Surge Protection

• Piezoresistors on all HV outputs

• Zinc oxide arresters (IEC 60099-4 compliant) on input/output terminals

• Ground-referenced terminals for operator safety

2. Corona & Discharge Control

• 6kV corona-free HV bushings

• Dual corona rings per bushing

• Isovolumetric capacitance core for stable voltage distribution

Mechanical Design

Enclosure Features

• Steel housing with epoxy-coated finish

• Wheel-mounted for portability (4× industrial casters)

• Shell-type oil tank with conservator

Terminal Configuration

• LV terminals: Porcelain bushings

• HV terminals: Fiberglass-reinforced bushings

• Voltage-graded insulation for all outputs

Winding & Insulation

Advanced Winding Technology

• Cylinder-type winding with balanced top/bottom capacitance

• Electrostatic shielding between HV/LV windings

• Inter-turn insulation to prevent flashover

Dielectric Performance

• Partial discharge <10pC (IEC 60270)

• Impulse withstand: 95kV (1.2/50μs wave)

• Power frequency withstand: 15kV/min

Operational Guidelines

Installation Requirements

• Minimum 1m clearance from grounded surfaces

• Ambient temperature: -20°C to +45°C

• Oil dielectric strength ≥45kV before use

Maintenance Protocol

• Annual oil testing (breakdown voltage, acidity)

• Bushing inspection every 6 months

• Winding resistance check every 2 years

Typical Applications

• Power cable hipot testing

• Switchgear commissioning tests

• Rotating machine excitation systems

• High-voltage component R&D