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1MRK 511 409-UUS Rev. K
11.4.2.2
Four step directional ground fault protection
1.
Connect the test set for single current injection to the appropriate IED terminals.
Connect the injection current to terminals A and neutral.
2.
Set the injected polarizing voltage slightly larger than the set minimum polarizing voltage (5% of
Vn) and set the injection current to lag the voltage by an angle equal to the set reference
characteristic angle (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+ 180°.
3.
Increase the injected current and note the value at which the studied step of the function trips.
4.
Decrease the current slowly and note the reset value.
5.
If the test has been performed by injection of current in phase A, repeat the test, injecting current
into terminals B and C with a polarizing voltage connected to terminals B, respectively C.
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 trip level of the tested step, switch on the current and check
the time delay.
For inverse time curves, check the trip time at a current equal to 110% of the trip current for txMin.
9.
Check that all trip and pickup contacts trip according to the configuration (signal matrixes).
10.
Reverse the direction of the injected current and check that the step does not trip.
11.
Check that the protection does not trip 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.
11.4.2.3
Four step non-directional ground fault protection
1.
Do as described in
11.4.2.4
Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.4.3
Four step negative sequence overcurrent protection NS4PTOC
(46I2)
Prepare the IED for verification of settings as outlined in section
11.4.3.1
Function revision history
Document
revision
A
B
C
Table continues on next page
Phasor measurement unit RES670
Commissioning manual
Section
11.4.2.2, but without applying any polarizing voltage.
Product
History
revision
2.2.1
-
2.2.1
-
2.2.2
-
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
GUID-EB1A8DFD-5BAC-4024-ADA2-D9BE7A2B50A0 v2
"Preparing for test"
in this chapter.
GUID-FEAFB742-D0DA-4F9E-B4AC-84E568301282 v2
Section 11
SEMOD53296-208 v8
SEMOD53296-202 v5
SEMOD53296-122 v5
109
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