Current Reversal And Weak-End Infeed Logic For Residual Overcurrent Protection Ecrwpsch (85); Testing The Current Reversal Logic; Testing The Weak-End Infeed Logic - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
11.11.5 Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH (85)
Prepare the IED for verification of settings as outlined in section
for test" in this chapter.
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 (51N/67N) 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 3V0 to 5% of VBase and the phase angle between voltage and current
to 155°, the current leads the voltage.
2. Inject current (180° — AngleRCA) in one phase to about 110% of the set operating current of the
four step residual overcurrent protection (INDir).
3. Check that the IRVL output is activated in the disturbance recorder after the set time tPickUpRev.
4. Abruptly reverse the current to AngleRCA setting lagging the voltage, to operate the forward
directional element.
5. Check that the IRVL output still is activated after the reversal with a time delay that complies with
the setting tDelayRev.
6. Switch off the polarizing voltage and the current.
11.11.5.2

Testing the weak-end infeed logic

If setting WEI = Echo
1. Inject the polarizing voltage 3V0 to (180° — AngleRCA) of VBase and the phase angle between
voltage and current to 155°, the current leads the voltage.
2. Inject current (180° — AngleRCA) in one phase to about 110% of the setting operating current
(INDir).
3. Activate the CRL binary input.
4. Abruptly reverse the current to the setting of AngleRCA setup lagging the voltage, to operate the
forward directional element.
5. Switch off the current and check that the ECHO and CS appear on the corresponding binary output
during 200ms after resetting the directional element.
6. Switch off the CRL binary input.
194
No ECHO and CS should appear.
No ECHO and CS should appear.
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