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A.1 FREQUENTLY ASKED QUESTIONS
APPENDIX A
What would I do if the LPS-D gives a red LED status indication?
A
If the LPS-D relay displays a red LED status, prompt the relay for failure messages. Press the information key
(INF) and select Status. Scroll down the list and write the failure messages of the relay. Protection is not active
when the Status LED is red. This condition could indicate a critical failure: contact GE.
In which format should I save Xpression Builder configurable logic?
When configurable logic is created with Xpression Builder, it must be saved with a .BIN extension. The BIN file
is a binary formatted file which is downloaded to the relay. The user should also save the logic with an .EXP
extension. The EXP file saves the graphical layout of the logic. When both formats are saved, the logic
uploaded from the relay can be matched to the graphical layout saved for the configurable logic file. If an EXP
file is not created, Xpression Builder will give the relay logic a graphical layout which is logically correct, but
may have a poor layout.
Which do I download first: Xpression Builder configurable logic or relay settings?
First, download protection and general settings using the ALPS-Link program. Secondly, download the config-
urable logic into the relay. The order of these two steps is important because downloading configurable logic or
settings change the inputs and outputs of the relay. The last settings downloaded are saved in the relay.
Does ALPS-Link work with Windows NT?
Yes. ALPS-Link versions 3.30304 and later work on Windows 3.1, Windows 95, and Windows NT platforms.
The install program will look to see what operating system the user is running and will install the correct execut-
able.
Are the Trip Output Contacts (T1 to T4/T6) polarity sensitive?
Yes. The Trip Output Contacts are polarity sensitive even if the user does not have an SCR model. The internal
circuitry requires the correct polarity for the trip circuit monitor function to operate properly. The contact polari-
ties are shown in Figures 1–22: ELEMENTARY DIAGRAM WITH DEFAULT I/O ASSIGNMENTS and 1–23:
ELEMENTARY DIAGRAM.
Can I create a settings file without having a relay?
Yes. The LPS-D PC software package includes a program called ALPS-SET which allows you to create a set-
tings file based upon your relay model number. See Chapter 14: ALPS-SET PC SOFTWARE.
Can I plot the phase and ground characteristics of my settings for the relay?
Yes. The LPS-D PC software package includes a program called ALPS-Test which allows you to plot the phase
and ground characteristics from your settings file. See Chapter 10: ALPS TEST PROGRAM.
What format should I choose when saving oscillography data?
If you use the GE-DATA program to view oscillography, save the data in DAFF format. For other comtrade
compatible viewers, save the data in the COMTRADE format. Note: a readme file in the LPS/UTIL directory
describes the procedure to convert LPS-D oscillography for use with the DL-DATA program.
Why are so many files created when I save oscillography data?
Several files are created when oscillography data is retrieved from the relay because they each serve different
purposes.
Saving data in the DAFF format creates an OSC, DAF, and REP file. The OSC file is used to playback a wave-
form to the relay. The DAF file is used by the GE-DATA program to view the waveforms and flags within the
relay. The REP file contains the fault report and settings in the relay at the time of the fault.
A-
LPS-D Line Protection System
GE Power Management
2
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