325KV/200pF SF6 Dual-Function Voltage Divider & Coupling Capacitor

This advanced SF6-insulated device serves dual roles as a high-accuracy voltage measurement divider and power line carrier coupling capacitor, specifically engineered for intermittent high-voltage applications in smart substations.

Technical Specifications

Dual-Function Advantages

As Voltage Divider

• Precision 1000:1 ratio for protection systems

• ≤5pC PD ensures measurement integrity

• SF6 gas insulation prevents surface discharges

As Coupling Capacitor

• 200pF optimized for carrier signal injection

• Low loss design maximizes signal transmission

• Intermittent operation matches PLC duty cycles

Intermittent Operation Design

• Thermal Management: 15-minute ON/OFF cycles prevent gas overheating

• Durability: 8 daily cycles (4 hours total) designed for PLC systems

• Recovery Time: 15-minute cooling maintains SF6 dielectric strength

Installation Requirements

1. Mount on vibration-isolated platform (max 0.1g vibration)

2. Maintain SF6 gas pressure at 0.42±0.03MPa (at 20°C)

3. PLC connections require:

• 50Ω impedance matching

• Lightning arrestors on carrier terminals

4. Grounding resistance <4Ω

Maintenance Protocol

Compliance Standards

• IEC 60358-1 (Coupling capacitors & voltage dividers)

• IEC 61869-11 (Low-power voltage transformers)

• IEEE C93.3 (Power line carrier coupling devices)

• GB/T 4109 (Chinese HV capacitor standards)

Important: Never exceed 8 operation cycles/day or 15-minute continuous operation to prevent SF6 gas overheating and dielectric strength reduction.