Hitachi RED670 - Testing the Weak-End Infeed Logic

4. Abruptly reverse the current to AngleRCA setting lagging the voltage, to operate the forward
directional element.
5. Check that the IRVL output still is activated after the reversal with a time delay that complies
with the setting tDelayRev.
6. Switch off the polarizing voltage and the current.
11.11.6.2 Testing the weak-end infeed logic
M13936-25 v2
If setting WEI = Echo
M13936-27 v8
1. Inject the polarizing voltage 3U0 to (180° — AngleRCA) of UBase and the phase angle
between voltage and current to 155°, the current leads the voltage.
2. Inject current (180° — AngleRCA) in one phase to about 110% of the setting operating current
(IN>Dir).
3. Activate the CRL binary input.
No ECHO and CS should appear.
4. Abruptly reverse the current to the setting of AngleRCA setup lagging the voltage, to operate
the forward directional element.
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.
If setting WEI = Echo & Trip
M13936-52 v12
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.
Section 11 1MRK 505 378-UEN Rev. K
Testing functionality by secondary injection
226 Line differential protection RED670
Commissioning manual
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