Overcurrent Elements
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Validation Pickup Test Values
The instructor will use the SEL-AMS (Adaptive Multichannel Source) to inject secondary quantities into
the relay terminals to simulate faults (as indicated in Table 1).
Table 1 Simulated F1 Values for Element Pickup Test
Input
(Fault Applied at F1 Location)
Element Fault
IAW1 51P1P
IAW2 51P2P
IAW
n
(
n
= 2 in this example)
50NN21P
The instructor will apply the test values to the relay using the SEL-5401 Test System Software
front-panel
function. Apply a value slightly less than the pickup setting, and slowly increase the current magnitude
until the applicable Relay Word bit asserts.
Step 1
Reset relay targets by pushing the
{TARGET RESET}
pushbutton located on the relay front panel.
Step 2
Clear the Sequential Events Recorder (SER) entries.
You can perform this task by using either the
SER C
serial port command or the
AC
SEL
ERATOR
QuickSet human-machine interface (HMI).
The instructor will apply the fault current.
Step 3
Use the
TAR
n
serial port command (
n
= the Relay Word bit for the element under test) or the
AC
SEL
ERATOR
QuickSet HMI to verify the overcurrent element pickup.
Step 4
Verify the following
AC
SEL
ERATOR
QuickSet HMI user-defined target light-emitting diode (LED)
indicators:
•
Phase time-overcurrent element 51P1P asserts.
•
Phase time-overcurrent element 51P2P asserts.
•
Neutral instantaneous overcurrent element 50NN21P asserts.
Record the element in the “Fault” column of Table 1.
