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, YNd5 transformers with OLTC. Each power transformer has a dedicated IED which provides integrated protection and control for the transformer.