Engineered for critical power infrastructure monitoring, the LQHVF 700kV/250pF dual-stage capacitor delivers laboratory-grade precision in substation environments. Combining ultra-low partial discharge performance with exceptional dielectric stability, this compact solution enables accurate voltage measurement and power line communication in extra-high-voltage networks.

Technical Specifications

Electrical Parameters

• Rated Voltage: 700kV AC (2×350kV stages)

• Stage Capacitance: 500pF ±5%

• System Capacitance: 250pF +5%/-10%

• Frequency: 50Hz

Performance Metrics

• Partial Discharge:

• ≤3pC at 700kV (100% Un)

• ≤1pC at 560kV (80% Un)

• Dielectric Loss: <0.2% @ 20°C

• Short-Time Withstand: 840kV (1.2Un) for 60s

Compact Engineering Design

Space-Optimized Structure

• Dimensions: 2000×2000×6400mm

• Weight: 280kg

• Dual-stage vertical integration

• Minimal footprint for substation installation

Dielectric Performance

• Stabilized tanδ (0.9-1.1 Uns)

• Temperature-compensated design

• N2-inerted insulation system

Precision Measurement Capabilities

Safety & Industry Applications

Ultra-Low PD Advantages

• Early detection of insulation degradation

• Reduced electromagnetic interference

• Enhanced grid communication clarity

Critical Applications

• EHV substation busbar monitoring

• Power line carrier communication

• Transformer diagnostic systems

• Smart grid sensor networks

Certifications & Standards

International Compliance

• IEC 60358-1: Coupling capacitors

• IEC 60270: Partial discharge measurement

• IEEE 4: Standard for HV testing

• ANSI C93.1: Power line carrier requirements

Installation & Maintenance

1. Foundation preparation: 2.5×2.5m concrete pad

2. Stage assembly verification (torque 120Nm)

3. Pre-commissioning PD baseline test

4. Bi-annual dielectric loss monitoring

Safety Notice: Requires Class E3 PPE per IEC 61482. Minimum phase-to-ground clearance: 5 meters.