System Protection Scheme for the DC Link between Tasmania and the Mainland Australia

The Basslink project will implement a DC transmission link between Tasmania and the Australian mainland. It is a 220 mile, 400 kV DC link with 185 miles of undersea cable. It is capable of exporting 600 MW of power from Tasmania or importing 300 MW from Victoria. This paper looks at the impact on the Tasmanian Network under loss of the DC link or the loss of one of a number of designated transmission lines. Solutions to achieve the required system performance "upon loss of the DC link" or "upon loss of a critical line" are presented. Contingency arming strategies that implement generation tripping during export and load shed during import will be discussed. The design of the contingency arming logic will be described