GE B30 Instruction Manual page 198

5.4 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 parameter
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 the actual values.
EXAMPLE USE OF SOURCES:
An example of the use of sources 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
5-68
CT/VT MODULE 2 CT/VT MODULE 3
CTs VTs
F 1
DSP Bank
F 5
Source 3
U 1
Volts Amps
V
V
Amps
Volts
M 1
Source 4
M 1
M 5
Figure 5–18: EXAMPLE USE OF SOURCES
B30 Bus Differential System
Source 1 Source 2
Amps Amps
51BF-1 51BF-2
87T
A W Var
A W Var 51P
UR Relay
5 SETTINGS
GE Multilin