High-Capacitance Solution for Variable Frequency Systems

Engineered for demanding 45kV applications, the LQHVF delivers exceptional performance across an unprecedented frequency spectrum. The 30nF capacitance and 500:1 ratio enable:

• Precision voltage measurement in VFD-driven equipment

• Partial discharge detection across wide frequency range

• Stable operation in 16.7Hz railway and 400Hz aerospace systems

• Dielectric testing of insulation materials

20Hz

300Hz

Technical Specifications

Wide Frequency Performance

Low-Frequency Stability

Accurate down to 20Hz

Application: VFD motor testing

Ratio error: ≤1.2% @ 20Hz

Power Frequency Precision

50/60Hz optimization

Application: Grid-connected systems

Ratio error: ≤0.8% @ 60Hz

High-Frequency Capability

Stable up to 300Hz

Application: Aerospace power

Ratio error: ≤1.5% @ 300Hz

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 Features

Removable Aluminum Corona Rings

High-strength alloy for transport efficiency

Benefit: 40% lighter than steel

Stabilized Pedestal

Removable base with non-slip design

Benefit: Secure operation on uneven surfaces

Oil-Immersed Construction

Mineral oil dielectric

Benefit: Enhanced thermal management

ONAN Cooling

Natural oil/air convection

Benefit: Stable operation during 60-min runs

High-Capacitance Advantages

Technical Advantage: 30nF capacitance provides 100× higher signal current than 300pF models, enabling precise measurements in noisy industrial environments

• Improved Signal-to-Noise Ratio: 25dB better than standard dividers

• Enhanced PD Detection: Superior sensitivity for small discharges

• Low-Impedance Coupling: Minimal signal attenuation (53Ω @ 100Hz)

• 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)

• Renewable energy converter testing

• High-voltage research laboratories

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. Operate at frequencies 20-300Hz

3. Max 60 minutes at 45kV

Safety

1. Withstand test: 49.5kV for 60s

2. Maintain 1m personnel clearance

3. Allow 10-min discharge after use

Transport & Handling

Disassembly

1. Remove corona rings

2. Detach HV arm from Ly arm

3. Separate base from assembly

Packaging

1. Use custom foam inserts

2. Protect connectors with caps

3. Secure components in transit case

Reassembly

1. Install base on stable surface

2. Connect Ly arm to HV arm

3. Attach corona rings

Field Advantage: Modular design reduces shipping volume by 40%

Why This High-Capacitance Design?

Noise Immunity

Superior performance in EMI environments

Frequency Flexibility

20-300Hz operational range

Signal Strength

High output current for instruments

System Safety

110% voltage withstand capability