Engineered for precision in ultra-high-voltage systems, the LQHVF 750kV/1000pF dual-stage capacitor delivers exceptional partial discharge performance and measurement accuracy. Featuring industry-leading PD levels as low as 3pC at 600kV and a precision 3000:1 ratio, this solution enables laboratory-grade performance in substation monitoring and high-voltage testing applications.

Technical Specifications

Electrical Parameters

• Rated Voltage: 750kV AC

• System Capacitance: 1000pF

• Stage Configuration: 2×375kV (2000pF per unit)

• Frequency: 50Hz

• Dividing Ratio: 3000:1 nominal

Performance Metrics

• Accuracy: ≤±1% full scale

• Dielectric Loss: <0.2%

• Insulation Withstand: 825kV (110%) for 1min

• Cooling System: ONAN (Oil Natural Air Natural)

Ultra-Low Partial Discharge Performance

PD levels verified per IEC 60270 with calibrated measurement system

Advanced Engineering Design

Dual-Stage Architecture

• 2×375kV modular units

• Field-configurable series connection

• Individual unit testing capability

• N2-inerted oil preservation

Transport Optimization

• Quick-release aluminum corona rings

• Disassemblable HV arms

• Compact shipping configuration

• Seismic-rated removable pedestal

Precision Measurement System

Configuration Options

• Single-Stage: 0-375kV measurement

• Dual-Stage Series: 0-750kV operation

• 3000:1 high-sensitivity output

Connection System

• Corona-free HV terminals (RIV <20dB)

• Variable frequency power source integration

• Low-inductance measuring leads (≤3nH/m)

• Scalable connectors for GIS/transformer interfaces

Safety & Compliance

Dielectric Integrity

• Zero discharge at 825kV withstand test

• Automatic PD cutoff at >5pC

• Real-time oil quality monitoring

International Standards

• IEC 60060-1: High-voltage testing

• IEC 60270: Partial discharge measurement

• IEEE 4: Measurement standards

• IEC 60358: Coupling capacitors

Industry Applications

Power Transmission

• 750kV+ substation monitoring

• Transformer impulse testing

• Gas-insulated switchgear diagnostics

Grid Communication

• EHV power line carrier systems

• HVDC filter bank monitoring

• Smart grid sensor calibration

Operational Guidelines

1. Pre-test insulation verification (>10GΩ)

2. Dual-grounding confirmation (IEC 61936)

3. ONAN cooling activation 30 min pre-operation

4. Continuous PD monitoring during tests

5. Annual dielectric strength validation

Safety Notice: Requires Class E4 PPE per IEC 61482. Minimum clearance: 7.5 meters for 750kV operations.