Completing The Test; Current Reversal And Weak-End Infeed Logic For Residual Overcurrent Protection Ecrwpsch - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
9. Reset the CR binary input.
10. Activate the BLOCK digital input.
11. Switch the fault current on (110% of the set operating current) and wait for a period longer than
the set value tCoord.
12. Switch the fault current and the polarizing voltage off.
13. Reset the BLOCK digital input.
Permissive scheme
1. Inject the polarizing voltage 3U0, which is 5% of UBase (EF4PTOC) where the current is
lagging the voltage by 65°.
2. Inject current (65° lagging the voltage) into one phase at about 110% of the set operating
current, and switch the current off with the switch.
3. Switch the fault current on, (110% of the set operating current) and wait longer than the set
value tCoord.
4. Switch the fault current off.
5. Activate the CR binary input.
6. Switch the fault current on (110% of the set operating current) and measure the operating time
of the ECPSCH logic.
Use the TRIP signal from the configured binary output to stop the timer.
7. Compare the measured time with the setting for tCoord.
8. Activate the BLOCK digital input.
9. Switch the fault current on (110% of the set operating current) and wait for a period longer than
the set value tCoord.
10. Switch the fault current and the polarizing voltage off.
11. Reset the CR binary input and the BLOCK digital input.
11.11.4.3

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.11.5 Current reversal and weak-end infeed logic for residual
overcurrent protection ECRWPSCH
Prepare the IED for verification of settings as outlined in section
"Preparing for test"
Values of the logical signals for ECRWPSCH are available on the Local HMI under Main menu/Tests/
Function status/Scheme communication/ECRWPSCH(85)/ECRWPSCH:1.
The Signal Monitoring in PCM600 shows service values that are available on the Local HMI as well.
184
No TRIP signal should appear.
No TRIP signal should appear, and the CS binary output should be activated.
No TRIP signal should appear.
in this chapter.
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