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4.2.2
64
Current reversal and weak end infeed
logic for residual
overcurrent protection (EFCA)
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.
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.
Chapter 10
Verifying settings by secondary
injection
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