Grading Capacitors - AIS

Outdoor installation

In air-insulated switchgears (AIS), grading capacitors ensure a uniform distribution of the voltage across the breaking chambers of the live tank circuit breaker.

Grading capacitors for AIS are compliant with standard IEC62146-1. They are available with a porcelain or a composite insulator. All standard porcelains are equipped with single or alternating long-short sheds and are in full compliance with IEC 60815. Maxwell standard fixing is independent of the flange diameter and ensures the interchangeability with old CONDIS® capacitors and the compatibility with the attachment of composite insulators. Other fixing methods are available on request.

The design of High-voltage grading capacitors for AIS is usually customer-specific. Maxwell CONDOR technology offers a high flexibility and will therefore allow for a large customization to meet specific circuit breaker mechanical and electrical needs.

In a recent addition to the AIS grading capacitor product range, "arctic" capacitors have been designed for application in the most severe environmental conditions, supporting extreme temperatures down to -60 degrees Celsius.

Product Features
Synthetic oil-based capacitor technology
Capacitance min from 200 pF
Highest quality and reliability
Nominal voltage Un from 9kV to 210kV 50/60Hz (e.g. for circuit breaker 1200kV 4 chambers)
Insulator in porcelain or composite
Test voltage up to 600kV 50/60Hz ( e.g. for circuit breaker 1200kV 4 chambers)
Maintenance free
Lightning impulse voltage up to 1300kV 1.2/50µs
Proven sealed construction
Switching impulse voltage up to 1000kV 250/2500µs
Corrosion resistance
Lightning impulse voltage chopped wave up to 2000kV 1.2/2µs
Vibrations and mechanical shocks up to >15g
Cantilever strength from 5kNm to 25kNm