U.4.50
SEL-421 Relay User’s Guide Date Code 20090715
Basic Relay Operations
Reading Oscillograms, Event Reports, and SER
Retrieving Event Report Data Files: Terminal
The relay recorded the event triggered in Triggering an Event on page U.4.42.
The procedure in the following steps shows you how to retrieve the event
report data files for this event. Perform the steps listed in Triggering an Event
on page U.4.42 before executing the instructions in this example. For this
procedure, you must use a terminal program capable of Ymodem protocol file
transfer.
Step 1. Prepare to monitor the relay at Access Level 1.
a. Using a communications terminal, type ACC <Enter>.
b. Type the Access Level 1 password and press <Enter>.
You will see the Access Level 1 => prompt.
Step 2. Type FILE DIR EVENTS <Enter> to view the events file
directory.
The relay lists file names for recently recorded events in a
manner similar to that shown in Figure 4.38.
In the figure, the relay shows two event report files:
E4_10001.TXT and E8_10001.TXT, and two Compressed
ASCII event report files: C4_10001.TXT and C8_10001.TXT.
Step 3. Type FILE READ EVENTS C8_10001.TXT <Enter> to
transfer the Compressed ASCII event report file to your
computer.
Step 4. Download the file. Perform the steps necessary for your
terminal emulation program to receive a file.
Typically, these are the file transfer steps:
➢ Specify the destination file location in your computer
file storage system and file name.
➢ Select the transfer type as Y-Modem (if not already
enabled).
➢ Click Receive.
You will usually see a confirmation message when the file
transfer is complete.
Step 5. When this file has transferred successfully, use the SEL-5601
Analytic Assistant to play back the event report oscillograms of
the 8-samples/cycle event report file you just transferred.
Use the ASCII command CEVENT to retrieve event report files in
Compressed ASCII format. See SEL Compressed ASCII Commands on
page R.5.4 and CEVENT on page R.9.5 for more information.
Viewing SER Records
The relay SER records relay operating changes and relay element states. In
response to an element change of state, the SER logs the element, the element
state, and a time stamp. Program the relay elements that the relay stores in the
SER records, thus capturing significant system events such as an input/output
change of state, element pickup/dropout, recloser state changes, etc.
The SEL-421 stores the latest 1000 entries to a nonvolatile record. Use the
relay communications ports or
ACSELERATOR QuickSet to view the SER
records. For more information on the SER, see Section 3: Analyzing Data in
the Applications Handbook.
Courtesy of NationalSwitchgear.com
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