High-Capacitance Solution for 20kV Systems

Engineered for industrial power applications, the LQHVF delivers laboratory-grade accuracy with field-deployable convenience. The 1000pF capacitance enables:

• Ultra-sensitive PD detection (<5pC) for insulation diagnostics

• Accurate RMS voltage measurement with ≤±1% accuracy

• Harmonic analysis up to 15kHz bandwidth

• Dielectric loss monitoring in transformers and cables

Technical Specifications

W300mm

H600mm

L300mm

Advanced Structural Features

Removable Corona Rings

Aluminum alloy construction with optimized geometry for corona suppression up to 25kV

Field Benefit: 50% faster assembly

Modular Design

Quick-disconnect L-arm, HV arm, and base for maintenance and transport

Component-level servicing

Oil-Immersed Construction

High-grade mineral oil for thermal management and arc suppression

ONAN cooling system

Stabilized Base

Non-slip design with leveling feet for uneven surfaces

Safety: Prevents tipping

Dual-Function Operation

PD Detection Advantage: 1000pF capacitance provides 60% higher signal current than 500pF models

Measurement Configuration

1. Voltage Division: Connect L-arm output to voltmeter (1000:1 reduced signal)

2. PD Coupling: Use HV terminal as coupling capacitor to PD analyzer

3. Simultaneous Operation: Correlate voltage transients with PD events

Thermal Management

• ONAN Cooling: Oil Natural Air Natural system maintains thermal stability

• Operating Regime: 60 minutes continuous at 20kV

• Cooling Requirements: Maintain 20cm clearance around unit

• Thermal Recovery: 1:1 rest period recommended after full-load operation

Compliance & Applications

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

Key Applications

• On-line PD monitoring in 20kV switchgear

• Factory acceptance testing of transformers

• Power quality measurement in industrial facilities

• Dielectric response analysis in research labs

• Calibration of protective relays

Operational Protocol

1. Assembly: Connect modules (base → L-arm → HV arm → corona rings)

2. Grounding: Establish earth connection with ≥10mm² cable

3. Cooling Check: Verify oil level sight glass before energization

4. Energization: Gradually ramp voltage to operational level

5. Measurement:

• Voltmeter: Connect to L-arm output

• PD Analyzer: Connect to HV terminal

6. Shutdown: Allow 10-minute discharge period before disassembly

Pro Tip: For PD measurements, use 50Ω coaxial cable ≤1.5m to minimize signal attenuation

Why Choose This Instrument?

Precision

≤±1% accuracy meets IEEE C57.13 Class 0.5 standards

Safety

Automatic discharge circuit when voltage <50V

Portability

Compact 300×300×600mm size (15kg) with carrying handles

Reliability

Oil-immersed design ensures stable performance in harsh environments