ABB RET670 Commissioning Manual page 263

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
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.
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 3U0 to about 90% of the setting (3U0>)
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 (3U0) 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 3U0 to about 110% of the setting (3U0>) 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 operate current
(IN>Dir ).
12. Activate the CRL binary input.
Section 11
M13936-52 v12
257