Sel SEL-421 - Test Db

R.9.52
SEL-421 Relay Reference Manual Date Code 20111215
ASCII Command Reference
Description of Commands
See Figure 1.13 on page R.1.17 for a sample TEC command response.
Use the TEC n command to preload the time-error correction value,
TECORR. If the value n is within range, the relay will prompt
Are you sure
(Y/N)?
. If the prompt is acknowledged, the relay sets analog quantity
TECORR = n, and asserts Relay Word bit PLDTE for approximately 1.5
cycles. The relay then displays the new TECORR value, along with the
remaining TEC command data. See Figure 1.14 on page R.1.18 for a sample
response.
The TECORR value does not affect the TE (time error) estimate until the
LOADTE SEL
OGIC equation asserts, as explained in Time-Error Calculation
on page R.1.16.
TEST DB
Use the TEST DB command for testing interfaces to a virtual device database.
For the SEL-421, the interface is the communications card. The relay contains
a database that describes the relay to external devices. When other devices
access the relay via the communications card, the relay appears as a virtual
device described by the database. The SEL-421 is Virtual Device 1.
The virtual database of any installed Ethernet card is accessible to master
stations of supported Ethernet protocols (DNP3, IEC 61850) connected to the
Ethernet network. You can, therefore, test the read functionality of all
protocols in the Ethernet interface with this command.
Use the TEST DB 1 command to override any value in the relay database.
You must understand the relay database structure to effectively use the TEST
DB command; see Section 4: Communications Interfaces for more
information.
TEST DB
Values you enter in the relay database are “override values.” Use the TEST
DB command to write override values in the database accessed through the
communications card.
The database address addr can be any legitimate decimal or hexadecimal
address. (A hexadecimal address is a numeral with an “h” suffix or a “0x”
prefix.)
Table 9.137 TEC Command
Command Description Access Level
TEC Display Time-Error data. 1, B, P, A, O, 2
TEC n Preload time-error correction value n,
where –30.000 <= n <= 30.000
B, P, A, O, 2
Table 9.138 TEST DB Command
Command Description Access Level
TEST DB Display present override values by virtual
device number and address.
1, B, P, A, O, 2
TEST DB 1 addr
value1
Write new data value1 to the database at an
address addr.
B, P, A, O, 2
TEST DB 1 addr
value1 M D Y h m s
Write new data value1 to the database at an
address addr and include the provided date/
time stamp M D Y h m s.
B, P, A, O, 2