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4.3
Current reversal and weak end infeed
logic for residual
overcurrent protection (EFCA)
10. Inject the polarising voltage 3U0 to about 110% of the setting
(Ugr) and the phase angle between voltage and current to
155°, the current leading the voltage.
11. Inject current (155° leading the voltage) in one phase to about
110% of the setting operating current (IN>Dir).
12. Activate the EFCA-CRL binary input.
No EFCA-ECHO, EFC--CS and EFCA-TRWEI should appear.
13. Abruptly reverse the current to 65° lagging the voltage, to op-
erate the forward directional element.
No EFCA-ECHO, EFC--CS and EFCA-TRWEI should appear.
14. Switch off the current and check that the EFCA-ECHO,
EFC--CS and EFCA-TRWEI appears on the corresponding bi-
nary output or on the local HMI unit, about 200 ms after reset-
ting the directional element.
15. Switch off the polarising voltage and reset the EFCA-CRL bi-
nary input.
Completing the test
Continue to test another function or complete the test by setting the test mode to off.
Chapter 10
Verifying settings by secondary
injection
65
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