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On Distribution Transformers, Three-phase Unbalanced Load Or Seasonal Overload
Shandong Weite Transformer Factory | Updated: Nov 30, 2016

Distribution variable three-phase load unbalance from the survey results show theexistence of a large number of, especially in rural areas, most of the single phase load load and load changes, so there are many three-phase distribution transformer load balancing, make it impossible for three-phase symmetrical operation, resulting in zero-sequence current ... 

This increases transformer losses on the one hand, on the other hand reduce the effective capacity of the transformer. These two situations will cause overheating, insulation of transformer oil ageing to make winding insulation levels, and will eventually cause damage to the transformer. You cantake the following measures:

① Investigate of distribution transformer load, including 24 hours a day and loadsand loads of the 4 seasons of the year, find out loads of big picture and try to adjust the three-phase load that approximates the symmetrical operation;

② Adjust peak and Valley time, reduce the load and transformer capacity expansionin a timely manner, avoiding transformer load.

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