Testing The Current Reversal Logic; Testing The Weak-End Infeed Logic - ABB RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.11.5.1
11.11.5.2
256
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.

Testing the current reversal logic

1. Inject the polarizing voltage 3U0 to 5% of UBase 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 (IN>Dir).
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 3U0 to (180° — AngleRCA) of UBase 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 (IN>Dir).
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.
1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
M13936-9 v7
M13936-25 v2
M13936-27 v8