Customer Challenge
Electricity utility Ergon Energy was looking to improve power quality on its Single Wire Earth Return (SWER)
lines, which were developed a century ago to bring power to remote parts of Australia and New Zealand. A single SWER line may stretch for hundreds of kilometers, with distribution transformers positioned at intervals along its length. The primary purpose of the SWER schemes was to accommodate basic domestic and farm loads.
Initially each customer used a relatively small amount of electricity. For these situations single phase systems because the best technical and economic option. The high capacity, higher cost three phase systems were not
necessary to supply the relatively small loads. >>>