5.2 Configuring analog CT inputs
M12312-6 v8
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 11: CT configuration
Parameter description Parameter name Range Default
Rated CT primary current in A CTPRIMn
n = channel number
from 0 to 99999 3000
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 CT
s 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.
5.3 Supervision of input/output modules
M11728-2 v3
I/O modules configured with PCM600 (BIM, BOM or IOM) are supervised.
I/O modules that are not configured are not supervised.
Section 5 1MRK 505 378-UEN A
Configuring the IED and changing settings
60 Line differential protection RED670 2.2 IEC
Commissioning manual
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