P.11.7
Date Code 20151029 Protection Manual SEL-411L Relay
Testing and Troubleshooting
Testing Features and Tools
metering data are available at the serial ports, from the ACSELERATOR
QuickSet
®
SEL-5030 software HMI, and at the front-panel LCD METER menu
(see MET on page P.15.32).
High-Resolution Oscillography
The relay takes an unfiltered data snapshot of the power system at each event
trigger or trip. The relay samples power system data at high sample rates from
1 kHz to 8 kHz (depending on your setting). You can use the SEL-5601
Analytic Assistant or other COMTRADE viewing program to export and view
these raw data in a binary COMTRADE file format. Use high-resolution
oscillography to capture fast power system transients or to examine low
frequency anomalies in the power system. See Raw Data Oscillography on
page P.8.8 for more information.
Event Reports
The relay also generates a filtered-quantities event report in response to faults
or disturbances. Each event report contains information on current and
voltage, relay element states, control inputs, and control outputs. If you are
unsure of the relay response or your test method, the event report provides you
with information on the operating quantities that the relay used at the event
trigger. The relay provides oscillographic displays of the filtered event report
data, which give you a visual tool for testing relay operating quantities. You
can use the serial ports and
ACSELERATOR QuickSet to view event reports.
See Event Reports, Event Summaries, and Event Histories on page P.8.14 for
a complete discussion of event reports.
Event Summary Reports
The relay generates an event summary for each event report; use these event
summaries to quickly verify proper relay operation. With event summaries,
you can quickly compare the reported fault current and voltage magnitudes
and angles against the reported fault location and fault type. If you question
the relay response or your test method, you can obtain the full event report and
the high-resolution oscillographic report for a more detailed analysis. See
Event Summary on page P.8.25 for more information on the event summary.
SER Reports
The relay provides an SER report that time tags changes in relay elements,
control inputs, and control outputs. Use the SER for convenient verification of
the pickup and dropout of any relay element. For a complete discussion of the
SER, see Sequential Events Recorder (SER) on page P.8.31.
Test Commands
TEST 87L Command
Use the TEST 87L command to test the 87L communications interface
(channels) or to test the 87L characteristic.
Select Test L (loopback) to carry out Loopback testing on a communications
channel. Select C (characteristic) to carry out testing of the 87L elements or to
disable the 87L elements so that other protection elements can be tested. In
addition, the TEST 87L command allows a single relay to be tested in
isolation (single-terminal test) or allows end-to-end testing of the complete
87L zone (multiterminal test).
NOTE: Control Inputs are sampled at
2 kHz, and the raw binary data (prior
to debounce timer conditioning) is
available in high-resolution
oscillography (see Figure 8.1). The
COMTRADE data labels for raw control
input data are optionally IN201–IN2nn,
IN301–IN3nn, where nn = 01–08 or
01–24.
NOTE: Control Inputs are sampled at
2 kHz, and then conditioned by a
debounce timer. The resulting Relay
Word bits are updated 8 times per
cycle and are available in standard
event report files (see Figure 8.1).
To Next Page
Loading...
