GE L90 Instruction Manual page 212

5.4 SYSTEM SETUP
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
Y LV
SRC 1
Phase CT M1
Ground CT M1
Phase VT M5
Aux VT None
5-66
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 5–14: EXAMPLE USE OF SOURCES
D HV AUX
SRC 2 SRC 3
F1+F5 None
None None
None None
None U1
L90 Line Current Differential System
Source 1 Source 2
Amps Amps
51BF-1 51BF-2
87T
A W Var
51P
A W Var
UR Relay
5 SETTINGS
GE Multilin