ABB RELION 630 Series Comissioning Manual

Also see for Relion 630 Series: Quick start guide Quick start guide Operation manual Engineering manual Product guide

ABB RELION 630 Series Comissioning Manual Manual pdf 23 page image

Be sure to set the correct technical key in both the IED and PCM600to prevent writing an application configuration to a wrong IED.See the engineering manual for information on how to create ormodify an application configuration and how to write to the IED.2.7 Checking CT circuitsCheck that the wiring is in strict accordance with the suppliedconnection diagram.The CTs must be connected in accordance with the terminal diagram provided withthe protection relay, both with regards to phases and polarity. The following tests arerecommended for every primary CT or CT core connected to the protection relay.• Primary injection test to verify the current ratio of the CT, the correct wiring upto the protection relay and correct phase sequence connection (that is L1, L2, L3.)• Polarity check to prove that the predicted direction of the secondary current flowis correct for a given direction of the primary current flow. This is an essential testfor the proper operation of the directional function, protection or measurement inthe protection relay.• CT secondary loop resistance measurement to confirm that the currenttransformer secondary loop DC resistance is within specification and that thereare no high resistance joints in the CT winding or wiring.• CT excitation test to ensure that the correct core in the CT is connected to theprotection relay. Normally only a few points along the excitation curve arechecked to ensure that there are no wiring errors in the system, for example, dueto a mistake in connecting the CT's measurement core to the protection relay.• Earthing check of the individual CT secondary circuits to verify that each three-phase set of main CTs is properly connected to the station earth and only at oneelectrical point.• Insulation resistance check.CT and VT connectors are pre-coded, and the CT and VT connectormarkings are different. For more information, see the installationmanual.Both the primary and the secondary sides must be disconnected fromthe line and the protection relay when plotting the excitationcharacteristics.1MRS756801 E Section 2Starting up630 series 15Commissioning Manual