5.2 Configuring analog CT inputs M12312-6 v8The analog input channels must be configured to get correct measurement resultsas well as correct protection functionality. Because all protection algorithms in theIED utilize the primary system quantities, it is extremely important to make surethat connected current transformer settings are done properly. These data arecalculated by the system engineer and normally set by the commissioner from thelocal HMI or from PCM600.The analog inputs on the transformer input module are dimensioned for either 1Aor 5A. Each transformer input module has a unique combination of current andvoltage inputs. Make sure the input current rating is correct and that it matches theorder documentation.The primary CT data are entered via the HMI menu under Main menu/Configurations/Analog modulesThe following parameter shall be set for every current transformer connected to theIED:Table 6:CT configurationParameter description Parameter name Range DefaultRated CT primary current in A CTPRIMnn = channel numberfrom 0 to 99999 3000This parameter defines the primary rated current of the CT. For two set of CTs withratio 1000/1 and 1000/5 this parameter is set to the same value of 1000 for both CTinputs. The parameter CTStarPoint can be used in order to reverse the direction ofthe CT. This might be necessary if two sets of CTs have different star pointlocations in relation to the protected busbar.For main CTs with 2A rated secondary current, it is recommended to connect thesecondary wiring to the 1A input.Take the rated permissive overload values for the current inputs intoconsideration.5.3 Supervision of input/output modules M11728-2 v3I/O modules configured with PCM600 (BIM, BOM or IOM) are supervised.I/O modules that are not configured are not supervised.Section 5 1MRK 506 383-UEN AConfiguring the IED and changing settings46 Line distance protection REL650 2.2 IECCommissioning manual
