The PC and IED must belong to the same subnetwork for this set-up to work.Setting up the PC to access the IED via a networkThe same method is used as for connecting to the front port.The PC and IED must belong to the same subnetwork for this set-up to work.4.7 Writing an application configuration to the IED M11734-2 v6When writing a configuration to the IED with PCM600, the IED is automatically set inconfiguration mode. When the IED is set in configuration mode, all functions are blocked. Thered LED on the IED flashes, and the green LED is lit while the IED is in the configuration mode.When the configuration is written and completed, the IED is automatically set into normalmode. For further instructions please refer to the users manuals for PCM600.4.8 Checking CT circuits M12182-2 v15Check that the wiring is in strict accordance with the supplied connectiondiagram.The CTs must be connected in accordance with the circuit diagram provided with the IED, bothwith regards to phases and polarity. The following tests shall be performed on every primaryCT connected to the IED:• Primary injection test to verify the current ratio of the CT, the correct wiring up to theprotection IED and correct phase sequence connection (that is L1, L2, L3.)• Polarity check to prove that the predicted direction of secondary current flow is correctfor a given direction of primary current flow. This is an essential test for the properoperation of the differential function and directional protection functions.• CT secondary loop resistance measurement to confirm that the current transformersecondary loop DC resistance is within the specification for the connected protectionfunctions. When the measured loop resistance is near the calculated value for maximumDC resistance, perform a complete burden test.• CT excitation test in order to confirm that the current transformer is of the correctaccuracy rating and that there are no shorted turns in the current transformer windings.Manufacturer's design curves must be available for the current transformer to comparethe actual results.• Earthing check of the individual CT secondary circuits to verify that each three-phase setof main CTs is properly connected to the station earth and only at one electrical point.• Insulation resistance check.While the CT primary is energized, the secondary circuit shall never be opencircuited because extremely dangerous high voltages may arise.Section 4 1MRK 502 067-UEN BStarting up46Commissioning manual
