P.13.8
SEL-411L Relay Protection Manual Date Code 20151029
Time-Synchronized Measurements
Configuring High-Accuracy Timekeeping
Step 7. Click File > Save to save the new settings in ACSELERATOR
QuickSet.
Step 8. Upload the new settings to the relay.
a. Click File > Send.
ACSELERATOR QuickSet prompts you for the settings
class or instance you want to send to the relay.
b. Click the check box for Group 1 check box and the
Output check box, as shown in the first dialog box of
Figure 10.17.
c. Click OK.
ACSELERATOR QuickSet responds with a display
similar to the second dialog box of Figure 10.17.
If you see no error message, the new settings are loaded
in the relay.
To confirm that you have prepared an out-of synchronization/loss of HIRIG
mode alarm, disconnect the IRIG-B input. The relay alarm will activate.
Figure 13.6 High-Accuracy Timekeeping Connections
Time-Synchronized
Triggers
Program the relay to perform data captures at specific times. Relays that are
time-locked using HIRIG mode provide high-accuracy time-synchronized
data captures. When you use this method on multiple relays, the actual trigger
times can differ by as much as 5 ms, but the information in the binary
COMTRADE file outputs from each relay is time-stamped at very high
accuracy. Do not assume that the relay triggers are locked with high accuracy;
rather, compare corresponding time-stamped data points from each
COMTRADE file.
Time Triggering the Relay
Perform the following steps to trigger an event data capture in the relay at a
specific time. These settings cause the relay to initiate a data capture at
12:00:30 p.m. Use other SEL
OGIC
®
control equations in a similar manner to
trigger relay event recordings.
Step 1. Configure the communications port:
a. Start the
ACSELERATOR QuickSet
®
SEL-5030
Software.
b. On the top toolbar, click Communication >
Parameters.
You will see the Communication Parameters dialog
box.
Relay
IRIG-B
COMM
GPS Receiver
to Data Server
NOTE: The MET PM time command can
be used to capture synchrophasor
data at a specific time, if
synchrophasors are enabled with
Global setting EPMU := Y (see View
Synchrophasors by Using the MET PM
Command on page C.6.27).
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