U.4.40
SEL-421 Relay User’s Guide Date Code 20090715
Basic Relay Operations
Examining Metering Quantities
Figure 4.31 Phasor Metering Quantities: ACSELERATOR QuickSet HMI
Step 9. Click the Instantaneous button of the HMI tree view to see
metering information similar to the terminal display of
Figure 4.27. Click the Synchrophasors, Demand/Peak,
Maximum/Minimum, or Energy buttons in the HMI tree view
to see more types of metering, with displays similar to the
terminal commands MET PM, MET D, MET M, and
MET E, respectively.
View Metering: Front
Panel
You can use the front-panel display and navigation pushbuttons to view the
metering quantities of the SEL-421 (see Meter on page U.5.15 for more
information on viewing metering on the relay front panel). The screens in this
procedure are for one circuit breaker, and this example assumes that you have
not enabled the demand metering and synchronism check features.
Step 1. Prepare to use the front panel by applying power to the relay.
Note that the LCD shows a sequence of screens called the
ROTATING DISPLAY. (If you do not operate the front panel for a
certain period, the relay will enter front-panel time-out mode
and you will see the sequential screens of the
ROTATING
DISPLAY
.)
Step 2. Press the {ENT} pushbutton to display the
MAIN MENU at the top
of Figure 4.32.
Step 3. View the metering selection screen.
a. Highlight the
METER action item (see the first screen of
Figure 4.32).
b. Press the {ENT} pushbutton.
The relay displays the
METER submenu (the second
screen in Figure 4.32).
Step 4. View the metering screens.
a. Press the {Up Arrow} and {Down Arrow} navigation
pushbuttons to highlight the
FUNDAMENTAL METER action
item (see Figure 4.32, middle screen).
b. Press the {ENT} pushbutton.
IC
VC
VA
IA
VB
IB
3I2
3I0
V1
I1
Phase Components Sequence Components
IA = 399.32 A ∠ -30.57˚
IB = 399.53 A ∠ -150.07˚
IC = 399.14 A ∠ 89.17˚
VA = 133.814 kV ∠ 0.00˚
VB = 133.813 kV ∠ -119.84˚
VC = 133.814 kV ∠ 120.30˚
FREQ = 59.99 Hz
I1 = 399.32 A ∠ -30.49˚
3I2 = 4.62 A ∠ 155.76˚
3I0 = 4.73 A ∠ -44.84˚
V1 = 133.813 kV ∠ 0.15˚
3V2 = 0.608 kV ∠ -62.09˚
3V0 = 0.607 kV ∠ -117.68˚
P = 137.919 MW
Q = 81.705 MVar
Courtesy of NationalSwitchgear.com
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