GE Multilin
T35 Transformer Protection System
5-59
5 SETTINGS
5.2 PRODUCT SETUP
5
When enabled, the LED test can be initiated from any digital input or user-programmable condition such as user-program-
mable pushbutton. The control operand is configured under the
LED TEST CONTROL
setting. The test covers all LEDs,
including the LEDs of the optional user-programmable pushbuttons.
The test consists of three stages.
1.
All 62 LEDs on the relay are illuminated. This is a quick test to verify if any of the LEDs is “burned”. This stage lasts as
long as the control input is on, up to a maximum of 1 minute. After 1 minute, the test will end.
2.
All the LEDs are turned off, and then one LED at a time turns on for 1 second, then back off. The test routine starts at
the top left panel, moving from the top to bottom of each LED column. This test checks for hardware failures that lead
to more than one LED being turned on from a single logic point. This stage can be interrupted at any time.
3.
All the LEDs are turned on. One LED at a time turns off for 1 second, then back on. The test routine starts at the top left
panel moving from top to bottom of each column of the LEDs. This test checks for hardware failures that lead to more
than one LED being turned off from a single logic point. This stage can be interrupted at any time.
When testing is in progress, the LEDs are controlled by the test sequence, rather than the protection, control, and monitor-
ing features. However, the LED control mechanism accepts all the changes to LED states generated by the relay and
stores the actual LED states (on or off) in memory. When the test completes, the LEDs reflect the actual state resulting from
relay response during testing. The reset pushbutton will not clear any targets when the LED Test is in progress.
A dedicated FlexLogic operand,
LED TEST IN PROGRESS
, is set for the duration of the test. When the test sequence is initi-
ated, the
LED TEST INITIATED
event is stored in the event recorder.
The entire test procedure is user-controlled. In particular, stage 1 can last as long as necessary, and stages 2 and 3 can be
interrupted. The test responds to the position and rising edges of the control input defined by the
LED TEST CONTROL
set-
ting. The control pulses must last at least 250 ms to take effect. The following diagram explains how the test is executed.
Figure 5–6: LED TEST SEQUENCE
842011A1.CDR
READY TO TEST
Start the software image of
the LEDs
STAGE 1
(all LEDs on)
control input is on
Wait 1 second
dropping edge of the
control input
Restore the LED states
from the software image
rising edge of the
control input
STAGE 2
(one LED on at a time)
STAGE 3
(one LED off at a time)
rising edge
of the control
input
rising edge of the
control input
Set the
LED TEST IN PROGRESS
operand
Reset the
LED TEST IN PROGRESS
operand
rising edge of the
control input
Wait 1 second
rising edge of the
control input
time-out
(1 minute)
Summary of Contents for T35 UR Series
Page 10: ...x T35 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Page 48: ...2 18 T35 Transformer Protection System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 314: ...5 192 T35 Transformer Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 338: ...6 24 T35 Transformer Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 350: ...7 12 T35 Transformer Protection System GE Multilin 7 2 TARGETS 7 COMMANDS AND TARGETS 7 ...
Page 366: ...8 16 T35 Transformer Protection System GE Multilin 8 2 CYBERSENTRY 8 SECURITY 8 ...
Page 406: ...A 14 T35 Transformer Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 540: ...D 10 T35 Transformer Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D ...
Page 552: ...E 12 T35 Transformer Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 560: ...F 8 T35 Transformer Protection System GE Multilin F 3 WARRANTY APPENDIX F F ...
