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MV – Gas Insulated Switchgear(GIS)

 
 
 

Fixed-mounted circuit-breaker switchgear 8DA and 8DB is indoor, factory-assembled, type-tested, single-pole metalenclosed, SF6-insulated switchgear with metallic partitions for single-busbar and double-busbar applications, as well as for traction power supply systems.

Typical Uses: It is used in transformer and switching substations, e.g.

Typical applications

  • Power supply companies
  • Power stations
  • Cement industry
  • Automobile industry
  • Iron and steel works
  • Rolling mills
  • Mining industry
  • Textile, paper and food industries
  • Chemical industry
  • Petroleum industry
  • Pipeline installations
  • Offshore installations
  • Electrochemical plants
  • Petrochemical plants
  • Shipbuilding industry
  • Diesel power plants
  • Emergency power supply installations
  • Lignite open-cast mines
  • Traction power supply systems

8DA/8DB Features:

Environmental independence

Compact design

Maintenance-free design

Innovation

Service life at least 35 years probably 40 to 50 years

Personal safety

Security of operation

Reliability

Modular design

Technology

  • Single-pole enclosure of the primary part by modular switchgear housings made of corrosion resistant aluminum alloy
  • Insulating gas SF6
  • Three-position disconnector as busbar disconnector and feeder earthing switch
  • Make-proof earthing by means of the vacuum circuitbreaker
  • Compact dimensions due to SF6 insulation
  • Hermetically bolted switchgear housings made of corrosion resistant aluminum alloy
  • Single-pole metal-enclosed, SF6-insulated busbars
  • Cable connection with inside-cone plug-in system, or for connection of gas-insulated and solid insulated bars
  • Wall-standing or free-standing arrangement
  • Installation and extension of existing switchgear at both ends without modification of existing panels

Interlocks

  • According to IEC 62271-200
  • Logical mechanical interlocks prevent maloperation
  • Three-position disconnector can only be operated with circuit-breaker in OPEN position
  • Circuit-breaker can only be operated with three-position disconnector in end position and operating lever removed
  • Locking device for circuit-breaker
  • Locking device for three-position disconnector
  • “Feeder earthed” locking device
  • Option: Electromagnetic interlocks

Instrument transformers

  • Current transformers not subjected to dielectric stress
  • Metal-enclosed, plug-in and disconnectable voltage transformers.

Vacuum circuit-breaker

  • Maintenance-free under normal ambient conditions according to IEC 62271-1
  • No relubrication or readjustment
  • Vacuum interrupters sealed for life
  • Up to 10,000 operating cycles (maintenance-free)
  • Option: Up to 30,000 operating cycles(maintenance required)

Secondary systems

  • Customary protection, measuring and control equipment
  • Option: Numerical multifunction protection relay with integrated protection, control, communication, operating and monitoring functions
  • Can be integrated in process control systems