HFRS 750kV/4500kVA Resonant Test System: Triple-Module Design for High Voltage Field Testing

Flexible Three-Module Configuration

The HFRS system offers unparalleled configuration versatility with three independent 250kV modules:

Critical Performance Specifications

• Frequency Range: 30-300Hz operational bandwidth (44Hz rated)

• Insulation Withstand:

• Module: 275kV/1min

• Pedestal-ground: 30kV/5min

• Quality Factor: Q≥80 at 44Hz

• Partial Discharge: <10pC at rated voltage

• Thermal Performance:

• Winding temperature rise: ≤80K

• Transformer oil rise: ≤55K

• Epoxy tube surface: <40K

• Continuous Operation: 1 hour at full rated power

Advanced Engineering Design

Core Technology

Precision-engineered magnetic circuit with:

• Segmented air gap iron core

• High-purity copper windings

• ±2% inductance tolerance

Thermal Management System

Oil-immersed self-cooling design features:

• Iron shell construction for maximum heat dissipation

• Breather capsule for oil expansion control

• Military-grade epoxy insulation

Field Deployment Features

• Shock-absorbing transport design (rail/road certified)

• Integrated suspension hooks (5-ton rated)

• Dual-configuration nameplates (serial/parallel)

• All-weather metal enclosure (IP54 rated)

Performance Comparison

Typical Test Applications

1. Extra High Voltage Cable Testing

Ideal for 400kV-750kV cable systems:

• Partial discharge localization

• Tan delta measurement at operational voltage

2. Power Transformer Testing

Comprehensive diagnostic capabilities:

• 750kV AC withstand testing

• Frequency response analysis

3. GIS Commissioning

Essential for gas-insulated switchgear:

• Three-phase simultaneous testing

• SF₆ density monitoring during tests

Operational Protocols

Safety Requirements

• Maintain 8m clearance during 750kV tests

• Ground all modules before reconfiguration

• Monitor oil temperature continuously

Maintenance Schedule

• Monthly: Visual inspection of bushings

• Quarterly: Oil dielectric strength test

• Annual: Full winding resistance test

• After 10 transports: Structural integrity check

This three-module resonant test system sets new standards for high voltage field testing, combining unmatched flexibility with laboratory-grade precision in field-deployable packages.