ABB REL 505-C1 2.3 Series - Page 70

64
Current reversal and weak end infeed
logic for residual
overcurrent protection (EFCA)
Chapter 10
Verifying settings by secondary
injection
3. Activate the EFCA-CRL binary input.
No EFCA-ECHO and EFC--CS should appear.
4. Abruptly reverse the current to 65° lagging the voltage, to op-
erate the forward directional element.
No EFCA-ECHO and EFC--CS should appear.
5. Switch off the current and check that the EFCA-ECHO and
EFC--CS appears on the corresponding binary output or on
the local HMI unit, about 200 ms after resetting the directional
element.
6. Switch off the EFCA-CRL binary input.
7. Activate the EFCA-BLOCK binary input.
8. Activate the EFCA-CRL binary input.
No EFCA--ECHO and EFC--CS should appear.
9. Switch off the polarising voltage and reset the EFCA-BLOCK
and EFCA-CRL binary input.
4.2.2 If setting WEI=Trip
Procedure
1. Inject the polarising voltage 3U0 to about 90% of the setting
(Ugr) operating voltage.
2. Activate the EFCA-CRL binary input.
No EFCA-ECHO, EFC--CS and EFCA-TRWEI outputs should
appear.
3. Increase the injected voltage to about 110% of the setting
(Ugr) operating voltage.
4. Activate the EFCA-CRL binary input.
5. Check that the EFCA-ECHO, EFC--CS and EFCA-TRWEI ap-
pears on the corresponding binary output or on the local HMI
unit.
6. Reset the EFCA-CRL binary input.
7. Activate the EFCA-BLOCK binary input.
8. Activate the EFCA-CRL binary input.
No EFCA-ECHO, EFC--CS and EFCA-TRWEI outputs should
appear.
9. Reset the EFCA-CRL and EFCA-BLOCK binary input.