HVDC smoothing reactors can be of air-core design as well as and oil-insulated units.
A DC reactor is normally connected in series with the converter. The main objectives of the reactor are:
- To reduce the harmonic currents on the DC side of the converter.
- To reduce the risk of commutation failures by limiting the rate of rise of the DC line current at transient disturbances in the AC or DC systems.
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Air-core smoothing reactor in the Kontek HVDC transmission |
By reducing the ripple, the DC reactor also contributes to reduce the potential for telephone disturbances from the DC line. Most smoothing reactors are air-core and air-insulated but reactors for the largest HVDC projects are often built as iron-core, oil-insulated units.
Oil-insulated smoothing reactor in the
Rihand - Dehli HVDC transmission