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Gas-insulated surge arrester AZ

Surge arrester for gas-insulated switchgear for system voltage up to 550 kV

The surge arresters are constructed from a stack of serially connected - extremely non-linear metal-oxide (MO) resistors in a metallic enclosure under pressurized SF6-gas. The high-field MO resistors of ABB surge arresters are manufactured by ABB.

The surge arrester is designed and type-tested according to IEC 62271-203 and IEC 60099-4.

Surge arresters are used to protect the insulation of gas-insulated switchgear, and connected cables, transformers etc. against all kind of transient atmospheric and switching overvoltages.

Applications

  • Protection of gas-insulated switchgear 
  • ​Protection of cables 
  • Protection of transformers

Why ABB?

  • Over 75 years of experience in overvoltage protection 
  • Local and global ABB application support 
  • Proven safe short-circuit design
  • Design life of more than 30 years
  • Own production of metal-oxide (MO) resistors with long-term stable characteristics
  • Compact design
  • Low residual voltages
  • Very good protection performance
  • High energy absorption capacity
Brief performance data
    AZ
System voltage  kV  up to 550 kV
Continuous voltage kV up to 374 kV
Line discharge class Class 3-5

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