ABB RET670 Commissioning Manual page 275

1MRK 504 165-UUS -
Transformer protection RET670 2.2 ANSI
Commissioning manual
No ECHO and CS should appear.
9. Switch off the polarizing voltage and reset the BLOCK and CRL binary input.
WEI = Echo & Trip
If setting
1. Inject the polarizing voltage 3V0 to about 90% of the setting (3V0PU) operating
voltage.
2. Activate the CRL binary input.
No ECHO, CS and TRWEI outputs should appear.
3. Increase the injected voltage to about 110% of the setting (3V0PU) operating
voltage.
4. Activate the CRL binary input.
5. Check that the ECHO, CS and TRWEI appear on the corresponding binary output or
on the local HMI.
6. Reset the CRL binary input.
7. Activate the BLOCK binary input.
8. Activate the CRL binary input.
No ECHO, CS and TRWEI outputs should appear.
9. Reset the CRL and BLOCK binary input.
10. Inject the polarizing voltage 3V0 to about 110% of the setting (3V0PU>) and adjust
the phase angle between the voltage and current to (180°- AnglRCA) setting, the
current leads the voltage.
11. Inject current in one phase to about 110% of the set trip current (INDir).
12. Activate the CRL binary input.
No ECHO and TRWEI should appear.
13. Abruptly reverse the current to 65° lagging the voltage to trip the forward directional
element.
Testing functionality by secondary injection
Section 11
269