Engineered for precision in extra-high-voltage systems, the LQHVF 700kV/4000pF unit delivers laboratory-grade measurement capabilities in field conditions. Combining ultra-low partial discharge performance with exceptional dielectric stability, this dual-function solution enables accurate voltage measurement and power line communication in demanding substation and testing environments.

Technical Specifications

Electrical Parameters

• Rated Voltage: 700kV AC

• Capacitance: 4000pF ±3%

• Frequency: 50Hz (60Hz optional)

• Dividing Ratio: 2000:1 nominal

Performance Metrics

• Accuracy: ≤±1% full scale

• Dielectric Loss: <0.2%

• Partial Discharge:

• <5pC at 700kV

• <2pC at 500kV

• Insulation Withstand: 770kV (110%) for 1min

Advanced Engineering Design

Transport-Optimized Components

• Quick-release aluminum corona rings

• Modular HV arm disassembly

• Compact shipping configuration

• N2-inerted oil preservation (O₂ <0.5%)

Thermal Management

• ONAN cooling (Oil Natural Air Natural)

• Temperature stability: ±2°C at full load

• Built-in oil quality sensors

Precision Measurement System

Connection System

• Corona-free HV terminals (RIV <25dB)

• Variable frequency source compatibility

• Scalable connectors for GIS/transformer interfaces

• Low-inductance measuring leads (≤5nH/m)

Stability & Safety Systems

Pedestal Design

• Removable seismic-rated base (IEC 60068-3 Class 2)

• Ground-level measurement terminals

• Interlocking stability feet

Dielectric Protection

• Zero discharge at 770kV withstand test

• Real-time PD monitoring system

• Automatic de-energization on anomaly detection

Certifications & Industry Applications

International Standards

• IEC 60060-1: High-voltage testing

• IEC 60270: Partial discharge measurement

• IEEE 4: Measurement standards

• IEC 60358: Coupling capacitors

Critical Applications

• EHV transformer diagnostic testing

• Substation power line carrier communication

• Cable partial discharge mapping

• Smart grid sensor calibration

Operational Guidelines

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

2. Dual-grounding confirmation (IEC 61936)

3. Cooling system activation 30 minutes pre-energization

4. Continuous PD monitoring during operation

5. Annual dielectric strength validation

Safety Notice: Requires Class E4 PPE per IEC 61482. Minimum clearance distance: 6 meters.