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 commissioning personnel 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
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 CTs have different neutral (WYE) 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.
Section 5 1MRK 502 073-UUS A
Configuring the IED and changing settings
60 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
To Next Page
Loading...
