Engineered for Variable Frequency Power Systems

Designed for 45kV applications from 20-300Hz, the LQHVF combines exceptional capacitance with precision measurement. The 500:1 ratio and ≤1.5% accuracy enable:

• Accurate voltage measurement in VFD-driven systems

• Partial discharge detection across wide frequency spectrum

• Dielectric testing of insulation materials

• Power quality analysis in specialized industrial systems

20Hz

300Hz

Technical Specifications

Wide Frequency Performance

Low-Frequency Capability

Stable performance down to 20Hz

Application: VFD motor testing

Mid-Range Performance

≤1% ratio error at 50/60Hz

Application: Power quality analysis

High-Frequency Capability

Accurate measurement up to 300Hz

Application: Aerospace power systems

Scalable Connection System

Single-Stage Configuration

Voltage Range: Up to 45kV

Connection: Corona-free HV terminal

Measurement: Via special lead-wire to VF source

Two-Stage Series Connection

Voltage Range: Up to 90kV

Configuration: Cascaded HV arms

Measurement: Differential technique

HV Connection: Corona-free terminals with scalable interfaces prevent RF interference during measurements.

Advanced Structural Design

Removable Aluminum Corona Rings

High-strength alloy optimized for transport

Benefit: 40% lighter than steel alternatives

Stabilized Pedestal

Removable base with non-slip design

Benefit: Secure operation on uneven surfaces

Oil-Immersed Construction

High-grade mineral oil insulation

Benefit: Enhanced thermal management

ONAN Cooling

Natural oil/air convection system

Benefit: Stable operation at full load

Unique High-Capacitance Advantages

Technical Insight: The 30nF capacitance provides 100× higher signal current than standard 300pF dividers, enabling precise measurements in noisy industrial environments

• Improved Signal-to-Noise Ratio: 25dB better than 1000pF models

• Enhanced PD Detection: Superior sensitivity for small discharges

• Low-Impedance Coupling: Minimal signal attenuation

• Wide Frequency Stability: Consistent performance across 20-300Hz

Compliance & Applications

Standards Compliance: IEC 61869-11:2023, IEEE 4-2013, EN 60060-1:2010

Industrial Applications:

• Variable Frequency Drive (VFD) system testing

• High-power motor and generator diagnostics

• Railway electrification systems (16.7Hz)

• Aerospace power systems (400Hz)

• High-voltage research laboratories

• Renewable energy converter testing

Operational Protocol

Assembly

1. Secure removable base

2. Install Ly-arm and Hy-arm components

3. Attach aluminum corona rings

Connection

1. Ground base with ≥10mm² cable

2. Connect special lead-wire to VF source

3. Apply HV via corona-free terminal

Operation

1. Ramp voltage gradually (≤5kV/s)

2. Max 60 minutes at 45kV

3. Frequency range: 20-300Hz

Safety

1. Maintain 1m personnel clearance

2. Withstand test: 49.5kV for 60s

3. Allow 10-min discharge after use

Why This High-Capacitance Design?

Noise Immunity

Superior performance in EMI environments

Frequency Flexibility

Stable 20-300Hz operation

Signal Strength

High output current for sensitive instruments

System Safety

110% voltage withstand capability