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Section 11
Testing functionality by secondary injection
negative sequence current pickup level. No output signals should be activated. Check under
NS4PTOC function Service Values that correct I2 magnitude is measured by the function.
3.
Set the injected negative sequence polarizing voltage slightly larger than the set minimum
polarizing voltage (default 5 % of Ub) and set the injection current to lag the voltage by an
angle equal to the set reference characteristic angle (180° - AngleRCA) if the forward
directional function is selected.
If reverse directional function is selected, set the injection current to lag the polarizing voltage
by an angle equal to RCA.
4.
Increase the injected current and note the value at which the studied step of the function
operates.
5.
Decrease the current slowly and note the reset value.
6.
Block lower set steps when testing higher set steps according to the instructions that follow.
7.
Connect a trip output contact to a timer.
8.
Set the injected current to 200% of the operate level of the tested step, switch on the current
and check the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the operate
current in order to test parameter txmin.
9.
Check that all operate and start 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 start and trip information is stored in the event menu.
11.5.5.2
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.5.6
Sensitive directional residual overcurrent and power protection
SDEPSDE
Prepare the IED for verification of settings as outlined in section
section
164
"Preparing for test"
in this chapter.
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 504 165-UEN Rev. K
"Requirements"
and
Transformer protection RET670
Commissioning manual
SEMOD53296-122 v5
SEMOD175060-3 v7
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