GE L90 Instruction Manual page 199

5 SETTINGS
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 CT/VT MODULE 2
CTs VTs
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.
GE Multilin
CT/VT MODULE 3
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
L90 Line Current Differential System
Source 1 Source 2
Amps Amps
51BF-1 51BF-2
87T
A W Var
A W Var 51P
UR Relay
5.4 SYSTEM SETUP
5
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