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For inverse time curves, check the operate time at a current equal to 110% of the
operate current for
txMin
.
9.
Check that all trip and trip contacts operate according to the configuration (signal
matrixes)
10. Reverse the direction of the injected current and check that the step does not operate.
11. Check that the protection does not operate when the polarizing voltage is zero.
12. Repeat the above described tests for the higher set steps.
13. Finally, check that pickup and trip information is stored in the event menu.
6.4.6.2
Four step non-directional residual overcurrent protection
1.
Do as described in
"Four step directional residual overcurrent protection"
, but
without applying any polarizing voltage.
6.4.6.3
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/Current/EF4PTOC(51N67N,4IN>)/X:EF4PTOC
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.
6.4.7
Sensitive directional residual overcurrent and power
protection SDEPSDE (67N)
Prepare the IED for verification of settings as outlined in
Values of the logical signals for SDEPSDE (67N) are available on the local HMI under
Main menu/Tests/Function status/Current/SDEPSDE(67N,IN<->)/1:SDEPSDE
.
The Signal Monitoring in PCM600 shows the same signals that are available on the
local HMI.
6.4.7.1
Measuring the operate and time limit for set values
Operation mode 3I
0
· cosφ
Procedure
1.
Set the polarizing voltage to 1.2 ·
VNRelPU
and the phase angle between voltage
and current to the set characteristic angle (
RCADir
), the current lagging the voltage.
Section 6
1MRK 506 331-UUS A
Testing functionality
68
Commissioning Manual
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