Gas Insulated Divider
350KV/3000pF SF6 Hybrid Capacitor Voltage Divider & Coupling System
This heavy-duty dual-function device sets new standards in high-voltage measurement and power line communication, combining exceptional 3000pF coupling capacity with precision measurement capabilities for modern EHV transmission systems.
Technical Specifications
| Parameter | Specification | Technical Advantage |
|---|---|---|
| Rated Voltage | 350KV | Designed for 330KV systems with 6% margin |
| Capacitance | 3000pF | Exceptional carrier signal coupling capability |
| Frequency Range | 50-300Hz | Wideband operation for harmonics analysis |
| Voltage Ratio | 1000:1 | Standard measurement scaling |
| Accuracy | ±1% | Class 1 measurement precision |
| Dielectric Loss | <0.3% | Minimal signal attenuation |
| Temp Coefficient | <0.0005 | Stable across -30°C to +70°C |
| Overvoltage | 385KV for 60s | 110% rated voltage withstand |
| Duty Cycle | 15min ON/15min OFF (8 cycles/day) | Optimized thermal performance |
Dual-Role Performance Features
As Voltage Divider
Wide 50-300Hz frequency response
±1% accuracy meets protection-class requirements
SF6 gas insulation ensures measurement stability
As Coupling Capacitor
3000pF high capacitance for strong signal coupling
Low loss design maximizes PLC efficiency
Integrated design reduces substation footprint
Wide-Frequency Operation
Power Frequency: 50/60Hz precise measurement
Harmonics Analysis: Up to 6th harmonic (300Hz) capability
Transient Recording: Captures switching surges
PLC Compatibility: 30-500kHz carrier frequencies
Installation Requirements
Foundation vibration limit <0.08g (ISO 10816-3 Class A)
Maintain SF6 pressure at 0.48±0.02MPa (at 20°C)
Install with:
Double-shielded measurement cables
Impedance matching box for PLC connections
Grounding resistance <2Ω (measured at 100Hz)
Maintenance Protocol
| Interval | Procedure | Parameters |
|---|---|---|
| Daily | Visual inspection | Check for gas leaks |
| Weekly | Gas pressure check | 0.46-0.50MPa |
| Monthly | Capacitance test | 3000pF ±1% |
| Quarterly | Dielectric loss test | <0.3% at 350KV |
Compliance Standards
IEC 60358-1:2018 (Coupling capacitors & dividers)
IEEE C93.5-2014 (Power line carrier applications)
GB/T 20840.8-2020 (Electronic voltage transformers)
IEC 62271-203:2016 (Gas-insulated switchgear)
Critical Note: The 3000pF capacitance requires specially designed impedance matching networks for PLC systems - standard coupling devices may not be suitable.
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