Configuring Analog Ct Inputs; Supervision Of Input/Output Modules - ABB RER670 Commissioning Manual

Section 5
Configuring the IED and changing settings
5.2
5.3
46

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/
Configurations/Analog modules
The following parameter shall be set for every current transformer connected to the
IED:
Table 10: 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.

Supervision of input/output modules

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
CTPRIMn from 0 to 99999
n = channel number
1MRK 506 377-UEN C
Default
3000
Railway application RER670 2.2 IEC
Commissioning manual
M12312-6 v8
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