Blocking scheme
M13926-9 v6
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
M13926-42 v8
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.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
244 Line differential protection RED670 2.2 IEC
Commissioning manual
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