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ETL600 1KHW001489-EN
ABB Switzerland Ltd
•
Check that the external connections are correct as per plant
drawings.
9.4.1.
Internal teleprotection equipment
9.4.1.1. Loop
test
When in operation, the unit can be tested with the aid of the loop test.
The signal used for this test has the same parameters (security and
dependability) as the command configured for the application with the
highest requirements regarding security.
It can be initiated manually at any time by choosing the
Equipment
menu, pointing to
Commissioning and maintenance
and clicking
NSD600 send looptest
.
It can also be executed automatically every 1, 3, 6, 12 or 24 hours by
correspondingly configuring the NSD600 in its
TPE
tab.
9.4.1.2.
Local test mode
The NSD600 can be set to a local operating mode for checking the
relay interfaces, e.g. for measuring command prolongation. In this
operating mode, which is indicated by a warning message in the status
display and the warning LED on the P4LT module, the command input
signal is looped by the processor back to the command output of the
local
teleprotection interface.
9.4.1.3.
Event Recorder and Command Counters
The integrated event recorder and the counters for each command
support investigations in case of faults or abnormal conditions in the
high voltage network. The event recorder can be synchronized to an
external GPS receiver for accurate time stamping in all the different
locations where ETL600 equipment is used. Therefore it is possible to
directly compare and analyze the logs of several ETL600/NSD600
devices in a network where a failure occurred. The display of events is
possible in text and graphical views on the HMI600.
for a detailed description of the event recorder.
9.5.
Frequently asked questions
Question:
The 'Connect' operation is not successful. What can I do to
correct this problem?
Answer:
Check all hardware and its settings forming the
communication path, starting at the PC and ending at the equipment.
The section 'Communication to the ETL600' in chapter
relevant information. If the communication path is made up of several
sections as in case of connection via modem, intranet/internet,
dedicated data channel and/or via EOC, proceed in steps, checking
the path sections in sequence starting at the side of the PC.
Troubleshooting November
2005
9-13
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