Gas Insulated Divider
600KV/750pF SF6 Hybrid Capacitor Voltage Divider & Coupling System
This breakthrough EHV device delivers dual functionality as a precision voltage measurement divider and power line communication coupler, engineered for 500KV+ transmission systems with industry-leading ≤2pC partial discharge performance.
Technical Specifications
Parameter | Specification | Technical Significance |
---|---|---|
Rated Voltage | 600KV | Designed for 550KV systems with 9% margin |
Capacitance | 750pF | Optimized balance between measurement loading and PLC coupling |
Frequency Range | 25-300Hz | Wideband operation for power quality analysis |
Voltage Ratio | 2000:1 | High-ratio measurement for EHV protection |
Accuracy | ≤±1% | Class 1 measurement precision |
Partial Discharge | ≤2pC @600KV | Ultra-low noise for sensitive measurements |
Dielectric Loss | <0.5% | Efficient signal transmission |
Temp Coefficient | <0.0005 | Stable across -40°C to +85°C |
Overvoltage | 660KV for 60s | 110% rated voltage withstand |
Operation Time | 20 minutes continuous | Designed for intermittent testing |
Dual-Function Engineering
As Voltage Divider
25-300Hz wide-frequency response
2000:1 ratio for EHV system protection
≤2pC PD enables sensitive measurements
As Coupling Capacitor
750pF optimized for carrier signal injection
Low-loss design (<0.5%) maximizes PLC efficiency
SF6 insulation prevents corona interference
Partial Discharge Innovation
Quadruple-Shield Design: Special electrode configuration minimizes discharges
Surface Treatment: Mirror-polished surfaces (Ra<0.5μm)
Gas Purity System: Integrated SF6 filtration maintains low PD
Measurement Impact: Enables detection of minute insulation defects
Installation Requirements
Foundation vibration limit <0.05g (ISO 10816-3 Class A)
Maintain SF6 pressure at 0.58±0.02MPa (at 20°C)
Install with:
Quad-shielded measurement cables
Impedance matching network for PLC
Clearance distances:
4m to grounded structures
6m to other HV equipment
Maintenance Protocol
Interval | Procedure | Acceptance Criteria |
---|---|---|
Pre-use | Gas pressure verification | 0.56-0.60MPa |
Weekly | Surface contamination check | No visible particles |
Monthly | Partial discharge test | ≤2pC @600KV |
Quarterly | Capacitance verification | 750pF ±1% |
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)
Essential Requirement: For PD measurements ≤2pC, must use fully shielded test environment (metal enclosure recommended) and fiber-optic measurement links to eliminate interference.