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Section 11
Testing functionality by secondary injection
2.
Increase the voltage and make note of the operate value U>Trip. This is done by manual
testing and without trip of the test set.
3.
Connect the trip contact to the test set to stop the test set for measurement of trip times below.
4.
Reduce the voltage slowly and make note of the reset value. The reset value must be high for
this function.
5.
Check the operating time by injecting a voltage corresponding to 1.2 ˣ U>Trip level. Make note
of the measured trip time.
6.
If required, verify the trip time at another voltage. Normally 2 ˣ U>Trip is selected.
7.
If used, measure the alarm level operating value. Increase the voltage and make note of the
operate value U>Alarm. This is done with manual test and without trip of the test set.
8.
Measure the operating time on the alarm output by connecting the stop of the test set to an
output from tAlarm. Inject a voltage 1.2 ˣ U>Alarm and measure the alarm time.
9.
Check that trip and alarm outputs operate according to the configuration logic.
10.
Finally check that start and alarm information is stored in the event menu and if a serial
connection to the SA is available verify that the correct and only the required signals are
presented on the local HMI and on the SCADA system.
11.3.2.2
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.
11.3.3
Restricted earth fault protection, low impedance REFPDIF
Prepare the IED for verification of settings outlined in Section
11.3.3.1
Function revision history
Document
revision
A
B
C
D
E
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11.3.3.2
Verifying the settings
94
The required trip and alarm voltage, as well as the used stabilizing resistance value
must be set in the function. Note as well that the used CT input in the IED must
have the ratio set as 1:1. This is essential for the measurement of the expected
value. Normally a slightly higher operating value is no problem as the sensitivity is
not influenced much.
Information on how to use the event menu is found in the operator's manual.
Product
History
revision
2.2.1
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2.2.1
-
2.2.2
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2.2.3
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2.2.3
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2.2.4
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2.2.4
The upper limit of ROA setting range is changed from 90 degrees to 119
degrees.
2.2.5
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1MRK 504 165-UEN Rev. K
"Preparing the IED to verify
GUID-BFAA47D8-C2B6-4EC2-9129-B031333BAD19 v2
Transformer protection RET670
Commissioning manual
SEMOD55257-73 v4
SEMOD55252-82 v8
settings".
SEMOD55252-86 v12
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