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Section 10
Testing functionality by secondary injection
218
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
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.
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.
No TRIP signal should appear.
10. Switch the fault current and the polarizing voltage off.
11. Reset the CR binary input and the BLOCK digital input.
1MRK 506 355-UEN A
Line distance protection REL670 2.1 IEC
Commissioning manual
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