Basslink, the operator of the cable, said only the electricity interconnector was affected.
"Regrettably, during the routine maintenance at a transition station in Victoria, a third-party contractor damaged a piece of equipment," the company said in a statement.
"Given the damaged equipment is unique, it will require appropriate expertise and equipment from overseas for repair before the interconnector can recommence operations.
"At this point in time, the fault only impacts the electricity interconnector. The Basslink telecoms cable providing broadband services to Internet service providers continues to operate."
basslink went down for maintenance over the weekend.— simon holmes à court (@simonahac) 27 March 2018
oddly it hasn't come back… and now they've stopped using gas!
tas has been 100% renewable for more than 24 hours.
• 2% solar
• 5% wind
• 93% hydro pic.twitter.com/seUjn3thca
Basslink is in the midst of a dispute with the Tasmanian Government over an earlier outage in December 2015 which lasted for six months. The government is seeking damages of $122 million; Basslink denies that it was responsible for the outage.
The statement said: "This incident is unrelated to the outage in December 2015 and the ongoing dispute with the state of Tasmania."
Contacted for comment, Hydro Tasmania, the Tasmanian Government body that is the predominant electricity generator in the state, said: "Tasmania's energy supply is extremely secure, and not meaningfully affected by the current short-term Basslink outage.
"Hydro Tasmania storages were at 36.9% on Monday. That’s an extremely secure level for early autumn, as we approach the wettest months of the year. It's also well above the High Reliability Level set by the Energy Security Taskforce.
"Especially given the time of year, we expect to manage quite comfortably without being able to import energy until mid-April."