Engineered for critical extra-high-voltage applications, the LQHVF 720kV/1000pF system delivers laboratory-grade precision in field conditions. Featuring an ultra-precise 3000:1 ratio and industry-leading ≤5pC partial discharge performance, this dual-function solution enables accurate voltage measurement and power line communication in demanding substation environments.

Technical Specifications

Electrical Parameters

• Rated Voltage: 720kV AC

• Capacitance: 1000pF ±4%

• Frequency: 50Hz

• Dividing Ratio: 3000:1 nominal

Performance Metrics

• Accuracy: ≤±1% full scale

• Dielectric Loss: <0.2%

• Partial Discharge: ≤5pC at 720kV

• Insulation Withstand: 792kV (110%) for 1min

• Cooling System: ONAN (Oil Natural Air Natural)

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%)

Precision Measurement System

• 3000:1 high-sensitivity ratio

• Low-noise output (SNR >60dB)

• Temperature-compensated electronics

Versatile Measurement Capabilities

Connection System

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

• Variable frequency source compatibility

• Scalable connectors for GIS/transformer interfaces

• Triple-shielded measuring leads

Stability & Safety Systems

Pedestal Design

• Removable seismic-rated base

• Interlocking stability mechanism

• Ground-level measurement terminals

Dielectric Protection

• Zero discharge at 792kV withstand test

• Real-time PD monitoring system

• Automatic de-energization on anomaly

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

• High-sensitivity partial discharge detection

• Grid stability monitoring

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: 6.5 meters for 720kV operations.