Completing The Test; Current Reversal And Weak-End Infeed Logic For Residual Overcurrent Protection Ecrwpsch; Testing The Current Reversal Logic; Transformer Protection Ret670 - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
10. Switch the fault current and the polarizing voltage off.
11. Reset the CR binary input and the BLOCK digital input.
11.11.4.2

Completing the test

continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
11.11.5 Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH
Prepare the IED for verification of settings as outlined in section
"Preparing for test"
Values of the logical signals for ECRWPSCH are available on the Local HMI under Main menu/
Tests/Function status/Scheme communication/ECRWPSCH(85)/ECRWPSCH:1.
The Signal Monitoring in PCM600 shows service values that are available on the Local HMI as
well.
First, test the four step residual overcurrent protection function EF4PTOC and then the
current reversal and weak-end infeed logic according to the corresponding instructions. Then
continue with the instructions below.
11.11.5.1

Testing the current reversal logic

1. Inject the polarizing voltage 3U0 to 5% of
and current to 155°, the current leads the voltage.
2. Inject current (
of the four step residual overcurrent protection (
3. Check that the IRVL output is activated in the disturbance recorder after the set time
tPickUpRev .
4. Abruptly reverse the current to
forward directional element.
5. Check that the IRVL output still is activated after the reversal with a time delay that
complies with the setting
6. Switch off the polarizing voltage and the current.
11.11.5.2

Testing the weak-end infeed logic

If setting
1. Inject the polarizing voltage 3U0 to (180° —
between voltage and current to 155°, the current leads the voltage.
2. Inject current (180° —
current (
3. Activate the CRL binary input.
234
No TRIP signal should appear.
in this chapter.
180° — AngleRCA ) in one phase to about 110% of the set operating current
tDelayRev .
WEI = Echo
AngleRCA ) in one phase to about 110% of the setting operating
IN>Dir ).
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UBase and the phase angle between voltage
IN>Dir ).
AngleRCA setting lagging the voltage, to operate the
AngleRCA ) of UBase and the phase angle
1MRK 504 165-UEN E
TESTMODE setting to Off .
"Requirements" and section

Transformer protection RET670

Commissioning manual
M13926-71 v5
M13936-2 v8
M13936-9 v7
M13936-25 v2
M13936-27 v8