Configuring Analog Ct Inputs; Reconfiguring The Ied - ABB rec670 Commissioning Manual

Section 5
Configuring the IED and changing settings
5.2
5.3
54

Configuring analog CT inputs

The analog input channels must be configured to get correct measurement results as
well as correct protection functionality. Because all protection algorithms in the IED
utilize the primary system quantities, it is extremely important to make sure that
connected current transformer settings are done properly. These data are calculated by
the system engineer and normally set by the commissioner from the local HMI or from
PCM600.
The analog inputs on the transformer input module are dimensioned for either 1A or
5A. Each transformer input module has a unique combination of current and voltage
inputs. Make sure the input current rating is correct and that it matches the order
documentation.
The primary CT data are entered via the HMI menu under Main menu/Settings/
General Settings/Analog modules/AnalogInputs
The following parameter shall be set for every current transformer connected to the
IED:
Table 8: CT configuration
Parameter description
Rated CT primary current in A
This parameter defines the primary rated current of the CT. For two set of CTs with
ratio 1000/1 and 1000/5 this parameter is set to the same value of 1000 for both CT
inputs. The parameter CTStarPoint can be used in order to reverse the direction of the
CT. This might be necessary if two sets of CTs have different star point locations in
relation to the protected busbar.
For main CTs with 2A rated secondary current, it is recommended to connect the
secondary wiring to the 1A input.
Take the rated permissive overload values for the current inputs into
consideration.

Reconfiguring the IED

I/O modules configured with PCM600 (BIM, BOM or IOM) are supervised.
I/O modules that are not configured are not supervised.
Parameter name Range
CT Prim Input from 0 to 99999
1MRK 511 360-UEN A
Default
3000
Bay control REC670 2.1 IEC
Commissioning manual