Grading Capacitors for AC Dead Tank and GIS Circuit Breaker

Grading Capacitor AIS 2
Grading Capacitor AIS 2

Gas-insulated switchgear (GIS) circuit breakers for tough environments with extreme conditions (temperature variations, dust, pollution or confined space) use grading capacitors to ensure a uniform distribution of the voltage across the breaking chambers.

CONDIS® GIS capacitors have a sophisticated design— the electrical insulation is made by a vacuum impregnated epoxy resin tube with a smooth external surface. This design guarantees mechanical robustness and oil- and gas-tightness within a high pressurized environment in a large, specified temperature range. Our capacitors are partial-discharge-free and they have a proven record of high performance and reliability with years of in-field operation.

High-voltage GIS capacitors are compliant to the IEC62146-1 standard ; they can be used in various types of gas-insulated switchgears, and their design is therefore customer-specific. Independent of the application, the flanges, tubes, and field distribution will remain unchanged along the insulator.

Maxwell CONDIS®’ technology offers a high flexibility and will therefore allow for a large customization to meet specific circuit breaker mechanical and electrical needs. The new Thin Winding concept further enhances the possibility for a reduced length for low capacitance value. In a recent addition to the GIS product range, «Arctic» capacitors have been designed for applications in the most severe environmental conditions, supporting extreme temperatures down to -60° Celsius. Please find hereunder more product features.

Product features

  • Synthetic oil-based capacitor technology for CB up to 1200kV
  • Capacitance from 200 pF
  • Nominal voltage up to 420kV at 50/60Hz
  • Test voltage up to 1140kV at 50/60Hz
  • Lightning impulse voltage up to 1950kV 1.2/50µs
  • Compatible with SF6 by-products
  • Switching impulse voltage up to 1600kV 250/2500µs
  • Lightning impulse voltage chopped wave up to 2340kV 1.2/2µs
  • Vibrations and mechanical shocks up to >15g