go to the Gas-insulated switchgear product page Aleksey asked on Oct 6th, 2017 in Gas-insulated switchgear

Good day! Please, tell us the possible maximum losses of reactive power in the switchgear 500kV (power flow through the switchgear about 1000 MW).

Olav Knudsen , Principal Engineer, Gas-insulated switchgear

ABB's answer

ABB 550 kV GIS is designed for a single-phase continuous current of 4000 A. The maximum three-phase power flow through the switchgear is consequently 3500 MW.

  • The capacitance is approximately 60 pF per meter GIS (per phase).
  • The capacitive gain at 500 kV phase-to-phase voltage is approximately 0.0016 MVAr per meter GIS (per phase).
  • The inductivity is approximately 210 nH per meter GIS (per phase).
  • The inductive loss at 1000 MW power flow through the GIS (three-phase) is approximately 0.000088 MVAr per meter GIS (per phase).

At the given conditions (500 kV and 1000 MW) the capacitive power gain is about 20 times bigger than the inductive power loss.
The reactive power is therefore mainly capacitive. Even at max power flow of 3500 MW through the GIS the reactive power is mainly capacitive.
The GIS therefore has no reactive power losses.
The maximum reactive power gain occur when no current is flowing and is the above mentioned 0.0016 MVAr per meter GIS (per phase) or 0.005  MVAr per meter GIS (three-phase)

If this is a project specific question please contact our local ABB representatives, who can help you to get in contact with the right people in our service department or with the project manager of the installation.



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Area expert

  • Olav Knudsen

    Olav Knudsen

    Principal Engineer, Gas-insulated switchgear

    High Voltage Products

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