3.35
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Basic Relay Operations
Examining Metering Quantities
Examining Metering Quantities
SEL-400 series relays feature high-accuracy power system metering. You can
view fundamental and rms quantities by using a communications terminal,
QuickSet, or the front panel. For more information on relay metering, see
Section 7: Metering, Monitoring, and Reporting in the product-specific instruc-
tion manual.
View Metering Using the Terminal
The procedure in the following steps shows how to use a terminal or terminal
emulation computer program to view power system metering. In this example,
you connect specific voltages and currents for a 5 A, 60 Hz relay. Scale these
quantities appropriately for your particular relay.
This example assumes that you have successfully established communication
with the relay (see Making an EIA-232 Serial Port Connection on page 3.4). In
addition, you must be familiar with relay access levels and passwords (see
Changing the Default Passwords in the Terminal on page 3.10 to change the
default access level passwords). Step 1 through Step 7 are necessary if you have
not yet configured the relay and want to test metering using a test source. If the
relay is already connected to the system, you may jump to Step 8 to view the sys-
tem metering information.
Step 1. Prepare to control the relay at Access Level 2.
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.
c. Type 2AC <Enter>.
d. Type the correct password to go to Access Level 2.
You will see the Access Level 2 =>> prompt.
Step 2. Set the relay to a nominal operation mode.
a. Use a terminal to perform the initial Global settings relay setup in
Making Settings Changes in Initial Global Settings on page 3.20.
b. Set the relay for 60 Hz operation, ABC phase rotation.
Step 3. Some SEL-400 series relays support voltage and current source
selection. In these relays, configure the source selection appropriate for
metering testing. The following shows how to do this in an SEL-451
(see Figure 3.25). Use the terminal to set Global setting ESS := 1.
a. Type SET G ESS TERSE <Enter>.
b. Type 1 <Enter>.
c. Type END <Enter> to finish this settings session.
d. Answer Y <Enter> to the save settings prompt.
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