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1MRK 505 378-UEN Rev. K
25.
Check that the line impedance (R1 and X1) and reactor impedance (Xc) are set to the correct
values.
26.
Inject symmetrical phase voltages equal to 120% of the rated voltage.
27.
Increase the injected current (same phase angle as the injected voltage) in phase L1 from zero
and note the operated value (start value) of the function. Check that this value is equal to:
U
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.
11.11.7.3
Sudden change in current variation SCCVPTOC
Prepare the IED for verification of settings as outlined in section
"Preparing for test"
1.
Set Operation to On.
2.
Connect the test set for three-phase current injection to the appropriate IED terminals.
3.
Inject symmetrical phase currents equal to half the rated current.
4.
Increase the injected current in phase L1 slowly by more than the set I>. No signal shall be
activated.
5.
Decrease the injected current in phase L1 to half the rated current.
6.
Increase the injected current in phase L1 in a step by more than the set I>. Start and trip signal
shall be activated.
11.11.7.4
Carrier receive logic LCCRPTRC
Prepare the IED for verification of settings as outlined in section
"Preparing for test"
1.
Set Operation to On.
2.
Select OpMode according to the application: If two carrier channels are used and high security
shall be used set OpMode = 2 Out Of 2, otherwise 1 Out Of 2.
3.
Connect switchable binary signal/s CR1 and CR2 to the binary input/s to be used for the carrier
receive (CR) signal/s.
4.
Connect switchable binary signal/s to the binary input to be used for the local check signal. If
three pole trip is used only one LOCTR is used. If single pole trip is used in addition the phase
selective signals LOCTRL1, LOCTRL2and LOCTRL3 are connected.
5.
Connect switchable binary signal/s to the binary input to be used for the communication
supervision signal/s CHERR1 and CHERR2.
If OpMode = 2 Out Of 2:
6.
Activate input and check output signals according to table
Table 42:
INPut
CR1
CHERR1
CR2
CHERR2
LOCTR
Table continues on next page
Line differential protection RED670
Commissioning manual
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Activate input signals if OpMode = 2 Out Of 2
© 2017 - 2022 Hitachi Energy. All rights reserved
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Testing functionality by secondary injection
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42
and 43.
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Section 11
229
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