Current Transformer Replacement

33kV current transformer replacement

Location: South Australia

HV electrical assets have a projected life cycle and require replacement either when the timeline is reached, or due to a catastrophic failure.

STE was engaged to replace six failed 33kV current transformers in a HV substation located in regional South Australia that had reached the end of their life expectancy.

The scope of work was inclusive of:

• The development of switching instructions and outage planning
• The disconnection and removal of the existing transformers
• The designs and installation of new concrete footings and steel support structures
• The installation of the replacement transformers including primary and secondary connections
• Conducting the full suite of HV tests
• The commissioning of the new units; and
• The energisation of the units.

Pre-mobilisation works included the development of safety documents, SWMS and COVID-19 procedures, the engagement of a civil contractor, a transport company and a crane hire company.

Mobilisation from the STE head office to site required the team to drive 450 km and arrange accommodation and meals for a period of fifteen days.