Murraylink

 ( Hvdc Transmission Lines ) 

Murraylink is an Australian high voltage direct current electricity transmission link between Berri, South Australia and Red Cliffs, Victoria, connecting the two state . Murraylink was commissioned in 2002 and is believed to be the world's longest underground transmission system and cost more than A$177 million. It was built by TransEnergie Australia, a subsidiary of Hydro-Québec. It was sold to the APA Group in March 2006 for A$153 million. In December 2008 ownership of Murraylink (as well as Directlink) was transferred to the newly formed Energy Infrastructure Investments Group, while APA continued as the operator. Electricity Transmission Network Service Providers - Directlink and Murraylink amended Cost Allocation Methodologies - March 2010 The ownership of EII is APA with 19.9%, with the balance with Marubeni (49.9%) and Osaka Gas (30.2%). electricity interconnectors

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Capacity Murraylink consists of two long bipolar HVDC cables. The circuit has an operating voltage of 150 kilovolt and a transmission capacity of 220 . The link operates an "HVDC Light" HVDC converter system, utilising insulated-gate bipolar transistors (IGBT), to convert electricity between alternating current and direct current.

While Murraylink is rated at 220MW, it is unable to operate at capacity during periods of high demand due to limitations in the transmission infrastructure at either end. The limitations relate to thermal overload of transformers or transmission lines supplying the Riverland (for South Australia to Victoria transmission) and western Victoria (for Victoria to South Australia transmission).

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