Restricted Earth-Fault Protection, Low Impedance Refpdif (87N); Verifying The Settings; Completing The Test - ABB RET650 Series Commissioning Manual

1MRK 504 136-UUS B
T2WPDIF(87T,Id)/T2WPDIF:1for the function, or for each individual function in a chain, to be
tested next. Remember to set the parameter
been tested.
Continue to test another function or end the testing by setting the parameter
Disabled under Main menu/Tests/IED test mode/TESTMODE:1. If another function is tested, then
set the parameter
T3WPDIF(87T,Id)/T3WPDIF:1 for the function, or for each individual function in a chain, to be
tested next. Remember to set the parameter
been tested.
7.3.2

Restricted earth-fault protection, low impedance REFPDIF (87N)

Prepare the IED for verification of settings as outlined in section
settings.
Values of the logical signals for REFPDIF (87) are available on the local HMI under Main menu/
Tests/Function status/Differential/REFPDIF(87,INd)/REFPDIF:X. The Signal Monitoring in
PCM600 shows the same signals that are available on the local HMI.
7.3.2.1

Verifying the settings

1. Connect the test set for single-phase current injection to the protection terminals connected
to the CT in the power transformer neutral-to-ground circuit.
2. Increase the injection current and note the operating value of the protection function.
3. Check that all trip and pickup contacts operate according to the configuration logic.
4. Decrease the current slowly from operate value and note the reset value.
5. Connect the timer and set the current to ten times the value of the IDMin setting.
6. Switch on the current and note the operate time.
7. Connect the test set to terminal A and neutral of the three-phase current input configured to
REFPDIF (87N). Also inject a current higher than half the
ground circuit with the same phase angle and with polarity corresponding to an internal
fault.
8. Increase the current injected in A, and note the operate value. Decrease the current slowly
and note the reset value.
9. Inject current into terminals B and C in the same way as in step 7 above and note the operate
and reset values.
10. Inject a current equal to 10% of rated current into terminal A.
11. Inject a current in the neutral-to-ground circuit with the same phase angle and with polarity
corresponding to an external fault.
12. Increase the current to five times the operating value and check that the protection does not
operate.
13. Finally check that trip information is stored in the event and disturbance recorder.
7.3.2.2

Completing the test

Continue to test another function or end the testing by setting the parameter
Disabled under Main menu/Tests/IED test mode/TESTMODE:1. If another function is tested, then
set the parameter
REFPDIF(87,INd)/REFPDIF:X for the function, or for each individual function in a chain, to be
Transformer protection RET650
Commissioning manual
Blocked to No under Main menu/Tests/Function test modes/Differential/
Blocked to No under Main menu/Tests/Function test modes/Differential/
© Copyright 2013 ABB. All rights reserved
Blocked to Yes , for each individual function that has
Blocked to Yes , for each individual function that has
Preparing the IED to verify
Idmin setting in the neutral-to-
Section 7
Testing functionality
TestMode to
SEMOD55252-82 v7.1.1
SEMOD55252-86 v8
SEMOD55252-118 v5
TestMode to
47