ABB RELION RET670, Commissioning Manual, Page: 275 / 328

No ECHO and CS should appear.
9. Switch off the polarizing voltage and reset the BLOCK and CRL binary input.
If setting
WEI = Echo & Trip
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.
1MRK 504 165-UUS -
Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 269
Commissioning manual