750KV/300pF SF6 Hybrid Capacitor Voltage Divider & Coupling System

This ultra-high voltage hybrid device delivers dual functionality for 800KV-class systems, combining precision measurement with power line communication capabilities in a single SF6-insulated unit with exceptional <5pC partial discharge performance.

Technical Specifications

Dual-Role Performance

As Voltage Divider

• 2000:1 ratio for EHV protection systems

• ±1% accuracy meets metering-class requirements

• Ultra-low <5pC partial discharge

As Coupling Capacitor

• 300pF optimized for carrier signal injection

• Low-loss design maximizes PLC efficiency

• Integrated solution reduces substation footprint

PD Control Technology

• Quad-Shield Electrodes: Four-stage grading rings

• Superfinish Surfaces: Mirror polish (Ra<0.3μm)

• Gas Purity System: Active SF6 filtration

• Thermal Management: 15-minute operation limit prevents gas overheating

Installation Requirements

1. Vibration-isolated foundation (max 0.05g)

2. Maintain SF6 pressure at 0.68±0.02MPa (20°C)

3. Measurement connections:

• Triple-shielded coaxial cables

• Minimum 10mm conductor diameter

4. Clearance distances:

• 6m to grounded structures

• 9m to other HV equipment

Maintenance Schedule

Compliance Standards

• IEC 60060-1:2010 (High-voltage test techniques)

• IEC 60358-1:2012 (Coupling capacitors/dividers)

• IEEE C93.3-2020 (Power line carrier coupling)

• GB/T 4109-2020 (Chinese HV capacitor standards)

Critical Notice: The 15-minute operation limit must be strictly observed to prevent SF6 gas decomposition. Allow 45 minutes cooling after each operation cycle.