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1MRK 504 165-UEN Rev. K
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 for 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.
11.5.4.3
Four step non-directional earth fault protection
1.
Do as described in
11.5.4.4
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.
11.5.5
Four step negative sequence overcurrent protection NS4PTOC
Prepare the IED for verification of settings as outlined in section
11.5.5.1
Function revision history
Document
revision
A
B
C
D
E
F
G
H
Procedure
1.
Connect the test set for injection of three-phase currents and voltages to the appropriate CT
and VT inputs of the IED.
2.
Inject pure negative sequence current, that is, phase currents with exactly same magnitude,
reversed sequence and exactly 120° phase displaced into the IED with an initial value below
Transformer protection RET670
Commissioning manual
Section
11.5.4.2, but without applying any polarizing voltage.
Product
History
revision
2.2.1
-
2.2.1
-
2.2.2
-
2.2.3
-
2.2.3
-
2.2.4
-
2.2.4
Maximum value changed to 2000.0 % of IBase for IMin1, IMin2, IMin3 and IMin4
settings.
2.2.5
-
When inverse time overcurrent characteristic is selected, the operate time of the
stage will be the sum of the inverse time delay and the set definite time delay. Thus,
if only the inverse time delay is required, it is important to set the definite time delay
for that stage to zero.
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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
GUID-F7AA2194-4D1C-4475-8853-C7D064912614 v4
GUID-F973601F-BC67-4E4F-A4CA-BE6253E2FB92 v3
Section 11
SEMOD53296-202 v5
SEMOD53296-122 v5
163
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