Testing The Weak-End Infeed Logic - ABB RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.11.5.2
268
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.

Testing the weak-end infeed logic

WEI = Echo
If setting
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.
No ECHO and CS should appear.
4. Abruptly reverse the current to the setting of AngleRCA setup lagging the voltage, to
operate the forward directional element.
No ECHO and CS should appear.
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.
7. Activate the BLOCK binary input.
8. Activate the CRL binary input.
1MRK 504 165-UUS -
Transformer protection RET670 2.2 ANSI
Commissioning manual