GUID-FC28C85A-6199-4249-8E01-C8693B005D3D V3 ENFigure 193: Operation during test operation of the line differential protection4.3.1.5 CommissioningThe commissioning of the line differential protection scheme would be difficultwithout any support features in the functionality because of the relatively longdistance between the IEDs. This has been taken into consideration in the design ofthe line differential protection. The communication channel can be used forechoing the locally fed current phasors from the remote end. By using this mode, itis possible to verify that differential calculation is done correctly in each phase.Also, the protection communication operation is taken into account with thedifferential current calculation when this test mode is used.Required material for testing the IED• Calculated settings• Terminal diagram• Circuit diagrams• Technical and application manuals of the IED• Single of three-phase secondary current source• Single of three-phase primary current source• Timer with start and stop interfaces• Auxiliary voltage source for the IEDs• PC with related software, a Web browser for WHMIThe setting and configuration of the IED must be completed before testing.The terminal diagram, available in the technical manual, is a general diagram of theIED.The same diagram is not always applicable to each specificdelivery, especially for the configuration of all the binary inputs1YHT530004D05 D Section 4Protection functions615 series 367Technical Manual
