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A protection design group which their company had fronted to budget problems, for pecuniary saving, decided to use of one set differential relay with three input current instead of two differential relay for protection of two same power transformers as indicated in below figure.
A protection design group which their company had fronted to budget problems, for pecuniary saving, decided to use of one set differential relay with three input current instead of two differential relay for protection of two same power transformers as indicated in below figure.All differential protection requirements according to relay manufacturer were considered by protection system designers. But in practice they face to one important problem in some case. Sometimes they fronted to maloperation of protection system when one of two power transformer was energized while another transformer was loaded past. They checked all protection function of relay such as its second harmonic restrain function. All things were very good and they could not analyze their problem.
How can you help them?
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