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 3V0, which is 5% of
VBase
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 (85) 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.
6.9.5.2
Completing the test
Continue to test another function or end the testing by setting the parameter
TestMode
to
Disabled
under
Main menu/Tests/IED test mode/1:TESTMODE
. If another
function is tested, then set the parameter
Blocked
to
No
under
Main menu/Tests/
Function test modes/Scheme communication/ECPSCH(85)/1:ECPSCH
for the
function, or for each individual function in a chain, to be tested next. Remember to set
the parameter
Blocked
to
Yes
, for each individual function that has been tested.
1MRK 506 331-UUS A
Section 6
Testing functionality
133
Commissioning Manual
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