GE t60 Instruction Manual page 118

5.3 SYSTEM SETUP
User Selection of AC Parameters for Comparator Elements:
CT/VT modules automatically calculate all current and voltage parameters from the available inputs. Users must select the
specific input parameters to be measured by every element in the relevant settings menu. The internal design of the ele-
ment specifies which type of parameter to use and provides a setting for Source selection. In elements where the parame-
ter may be either fundamental or RMS magnitude, such as phase time overcurrent, two settings are provided. One setting
specifies the Source, the second setting selects between fundamental phasor and RMS.
AC Input Actual Values:
The calculated parameters associated with the configured voltage and current inputs are displayed in the current and volt-
age sections of Actual Values. Only the phasor quantities associated with the actual AC physical input channels will be dis-
played here. All parameters contained within a configured Source are displayed in the Sources section of Actual Values.
Example Use of Sources:
An example of the use of Sources, with a relay with two CT/VT modules, is shown in the diagram below. A relay could have
the following hardware configuration:
INCREASING SLOT POSITION LETTER -->
CT/VT MODULE 1
CTs
This configuration could be used on a two winding transformer, with one winding connected into a breaker-and-a-half sys-
tem. The following figure shows the arrangement of Sources used to provide the functions required in this application, and
the CT/VT inputs that are used to provide the data.
5
5-40
CT/VT MODULE 2 CT/VT MODULE 3
VTs not applicable
F 1
DSP Bank
F 5
Source 3
U 1
Volts Amps
V
V
Volts Amps
M 1
Source 4
M 1
M 5
Figure 5–13: EXAMPLE USE OF SOURCES
T60 Transformer Management Relay
Source 1 Source 2
Amps Amps
51BF-1 51BF-2
87T
A W Var
A W Var 51P
UR Relay
5 SETTINGS
GE Multilin