The Levis De-Icer is a High voltage direct current (HVDC) system, aimed at de-icing multiple AC power line

Power Line

Power Line is an American political blog, providing news and commentary from a conservative point-of-view. It was originally written by three lawyers who attended Dartmouth College together: John H. Hinderaker, Scott W. Johnson, and Paul Mirengoff...

s in Quebec, Canada. It is the only HVDC system not used for power transmission.

In the winter of 1998, Québec's power lines were toppled by icing, sometimes up to 75 mm. To prevent such a damage, a de-icing system was developed.

The Levis De-Icer can use a maximum power of 250 MW; its operation voltage is ±17.4 kV. It can be used on multiple 735 kV AC power line

Power Line

Power Line is an American political blog, providing news and commentary from a conservative point-of-view. It was originally written by three lawyers who attended Dartmouth College together: John H. Hinderaker, Scott W. Johnson, and Paul Mirengoff...

s.

When there is no icing, the Lévis De-Icer installed at Hydro-Québec

Hydro-Québec

Hydro-Québec is a government-owned public utility established in 1944 by the Government of Quebec. Based in Montreal, the company is in charge of the generation, transmission and distribution of electricity across Quebec....

's Lévis substation operates as static VAR compensator

Static VAr compensator

A static var compensator is an electrical device for providing fast-acting reactive power on high-voltage electricity transmission networks. SVCs are part of the Flexible AC transmission system device family, regulating voltage and stabilising the system...

improving the stability of the AC lines.