Date Code 20011026 Maintenance and Testing 7-5
SEL-321/321-1 Instruction Manual
When the upper line of the display reads:
PASSWORD: TAIL
press the EXIT button to enter Access Level 2. The relay briefly displays the note
Level 2, then resumes the EN display.
Press the button labeled SET. The display shows:
SET GROUP
Press SELECT. Use the Down arrow button to enter the number 1, then press
SELECT again.
Note: The SEL-321 Relay includes six setting groups. While you are testing this
relay, it is important to change settings in the group that is active. If you
change settings in an inactive setting group, the relay performance will not
change. The relay is shipped with Setting Group 1 active. You may change
the active group by executing the GROUP command from the relay front
panel or from a terminal connected to a relay serial port. You must enter the
Breaker Access Level or Access Level 2 to change the active group.
Press the Down arrow button repeatedly, until the upper line of the display reads:
Misc Scheme Logic
Press SELECT. Press the Down arrow button repeatedly until the lower line of the
display reads:
TULO = 3
Press SELECT. Press the Up arrow button until the lower line of the display reads:
TULO = 1 *
Press SELECT. Press EXIT. Press YES to save the new settings.
Step 10.
Purpose: Test the fault locator.
Method: Test the fault locator using the voltages and currents in Table 7.1. These
voltages and currents were obtained for various locations and fault types assuming a
radial line with a source impedance of 0.2 times the total 100 mile line impedance.
Note: To simplify this step, apply dc voltage to the IN1 input. The relay
recognizes the asserted input when applied dc voltage is approximately equal
to the Logic Input voltage rating shown on the relay identification sticker.
Input IN1 is programmed to monitor the breaker auxiliary contact, 52A.
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