ABB RET670 Installation And Commissioning Manual page 200

Section 13
Verifying settings by secondary injection
194
1. Inject the polarizing voltage 3U0 at 5% of UBase (EF4PTOC) where the
current is lagging the voltage by 65°.
2. Inject current (65° lagging the voltage) in one phase at about 110% of the set
operating current, and switch the current off with the switch.
3. Switch the fault current on and measure the operating time of the
communication logic.
Use the TRIP signal from the configured binary output to stop the timer.
4. Compare the measured time with the set value tCoord.
5. Activate the CR binary input.
6. Check that the CRL output is activated when the CR input is activated.
7. Switch the fault current on (110% of the set operating current) and wait
longer than the set value tCoord.
No TRIP signal should appear.
8. Switch the fault current off.
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.
No TRIP signal should appear.
12. Switch the fault current and the polarizing voltage off.
13. Reset the BLOCK digital input.
Permissive scheme
Procedure
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.
No TRIP signal should appear, and the CS binary output
should be activated.
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.
1MRK 504 088-UEN C
Installation and commissioning manual