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The paper will present a utility experience from a project where protection and control for the whole substation is done by using IEC 61850 Standard. The special attention will be given to the control of parallel transformers with on-load tap-changer (OLTC), which has been achieved by using IEC 61850 analogue GOOSE messages between the regulators. In this substation, there are two 20MVA, 110/20kV,...
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