Engineered for ultra-high-voltage precision, the LQHVF 750kV/1500pF system delivers industry-leading partial discharge performance and measurement accuracy. Featuring breakthrough PD levels as low as 2pC at 440kV and a precision 3000:1 ratio, this dual-function solution enables laboratory-grade performance in substation monitoring and high-voltage testing applications.

Technical Specifications

Electrical Parameters

• Rated Voltage: 750kV AC

• Capacitance: 1500pF ±4%

• 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)

Breakthrough Partial Discharge Performance

PD measurements comply with IEC 60270 using calibrated detection systems

Advanced Engineering Design

Transport-Optimized System

• Quick-release aluminum corona rings

• Modular HV arm disassembly

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

• Compact shipping dimensions

Precision Measurement System

• 3000:1 high-sensitivity ratio

• Low-noise output (SNR >68dB)

• Temperature-compensated electronics

Versatile Connection System

Measurement Configurations

• Single-stage operation (0-375kV)

• Two-stage series connection (0-750kV)

• Corona-free HV terminals (RIV <18dB)

Signal Integration

• Variable frequency power source compatibility

• Low-inductance measuring leads (≤2.5nH/m)

• Scalable connectors for GIS/bushing interfaces

Stability & Safety Systems

Pedestal Design

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

• Interlocking stability mechanism

• Ground-level measurement terminals

Dielectric Protection

• Zero discharge at 825kV 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

• Ultra-high-voltage transformer testing

• Substation power line carrier communication

• High-sensitivity partial discharge detection

• HVDC converter station monitoring

Operational Guidelines

1. Pre-test insulation verification (>12GΩ)

2. Dual-grounding confirmation (IEC 61936)

3. Cooling system 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: 8 meters for 750kV operations.