GE L30 User Manual

5-94 L30 Line Current Differential System GE Multilin
5.4 SYSTEM SETUP 5 SETTINGS
5
The disturbance detector responds to the change in currents of twice the current cut-off level. The default cut-off threshold
is 0.02 pu; thus by default the disturbance detector responds to a change of 0.04 pu. The metering sensitivity setting (PROD-
UCT SETUP  DISPLAY PROPERTIES  CURRENT CUT-OFF LEVEL) controls the sensitivity of the disturbance detector
accordingly.
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:
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.
Figure 5–19: EXAMPLE USE OF SOURCES
INCREASING SLOT POSITION LETTER -->
CT/VT MODULE 1 CT/VT MODULE 2 CT/VT MODULE 3
CTs VTs not applicable
Y LV D HV AUX
SRC 1 SRC 2 SRC 3
Phase CT M1 F1+F5 None
Ground CT M1 None None
Phase VT M5 None None
Aux VT None None U1
827794A1.CDR
F 5
F 1
DSP Bank
U 1
M 1
M 1
M 5
51BF-1 51BF-2
Source 4
87T
51P
UR Relay
A
V
V
A
W
W
Var
Var
Amps
Source 1
Source 3
Volts
Amps
Amps
Volts
Amps
Source 2

GE L30 Specifications

General

Brand	GE
Model	L30
Category	Relays
Language	English