Advanced Measurement for Frequency-Variable Systems

The LQHVF 260kV/1000pF capacitive voltage divider delivers laboratory-grade accuracy in resonant test applications with its exceptional 3000:1 ratio and wide 20-300Hz frequency range. Engineered for high-voltage testing laboratories and field commissioning teams, this solution provides:

• Ultra-high 3000:1 ratio for precise low-voltage measurements

• 286kV insulation withstand (110% rated voltage)

• Broad frequency coverage for resonant test systems

• Scalable architecture for voltages up to 520kV

Industry-Leading Frequency Bandwidth

Performs accurate measurements across sub-harmonic, power frequency, and VLF applications with constant ≤±1.5% accuracy.

20Hz

→

300Hz

Technical Specifications

Innovative Design Features

Removable Corona Rings

Aerospace-grade aluminum alloy rings detach for transport and prevent corona above 150kV.

Stabilized Mobile Base

Removable pedestal with low center of gravity and seismic restraints.

Corona-Free HV Connection

Scalable connectors for single-stage (260kV) or series (520kV) configurations.

Frequency-Optimized Design

Low-inductance construction maintains accuracy across 20-300Hz range.

Advanced Measurement Capabilities

Dual-Stage Serial Connection

Measure voltages up to 520kV using series-connected configuration with maintained 3000:1 ratio.

Variable Frequency Operation

Direct interface to VF power sources for resonant testing applications with special lead-wire.

Industry Applications

Resonant Test Systems

Frequency-tuned testing of cables, transformers, and GIS at 20-300Hz.

VLF Cable Testing

0.1Hz testing of 220kV+ cables with high-ratio measurement.

Transformer Sweep Frequency

SFRA analysis from 20Hz to 300Hz with constant accuracy.

Operational Advantages

• High-Ratio Precision: 3000:1 ratio enables use with standard measurement instruments

• Thermal Stability: ONAN cooling maintains accuracy during 1-hour tests

• Wide Frequency Coverage: Single solution for power frequency and VLF testing

• Scalable Architecture: Connect multiple units for higher voltage applications

"The 3000:1 ratio eliminated our need for specialized measurement equipment - we now use standard lab instruments for 260kV tests with ±1.3% accuracy."
               - High-Voltage Lab Manager, Research Institute

Installation & Safety Protocol

1. Site Preparation: Level surface with 4m clearance radius

2. Assembly: Secure corona rings using alignment markers

3. Connection: Use shielded measuring leads to VF source

4. Configuration: Select single-stage or series mode

5. Safety: Maintain 5m clearance during 286kV withstand tests

6. Duration: Maximum 60 minutes continuous operation

7. Decommissioning: 20-minute discharge cycle before handling

Compliance & Standards

Manufactured to international electrical standards:

• IEC 60060-1/2: High-voltage test techniques

• IEEE 4: Standard for HV testing

• IEC 60270: Partial discharge measurements

• IEC 60502: Power cables testing requirements

Third-party certified at 286kV with ≤±1% ratio error validation.