When the IED is brought into normal service it is recommended to delete all events
resulting from commissioning tests to avoid confusion in future fault analysis. All events
in the IED can be cleared in the local HMI under Main Menu//Clear/Clear internal
event list or Main menu/Clear/Clear process event list. It is not possible to clear the
event lists from PCM600.
When testing binary inputs, the event list (EL) might be used instead. No uploading or
analyzing of registrations is then needed since the event list keeps running, independent
of start of disturbance registration.
11.2 Identifying the function to test in the technical reference
manual
Use the technical manual to identify function blocks, logic diagrams, input and output
signals, setting parameters and technical data.
11.3 Differential protection
11.3.1 Transformer differential protection T2WPDIF
andT3WPDIF(87T)
Prepare the IED for verification of settings outlined in Section
"Preparing the IED to
verify settings".
11.3.1.1 Verifying the settings
1. Go to Main menu/Test/Function test modes/Differential protection and make
sure that the restricted earth fault protection, low impedance function REFPDIF
(87N) is set to Disabled and that the four step residual overcurrent function
EF4PTOC (51N/67N) under Main menu/Test/Function test modes/Current
protection is set to Disabled, since they are configured to the same current
transformer inputs as the transformer differential protection. Make sure that the
transformer differential functions T2WPDIF (87T) or T3WPDIF (87T) are
unblocked.
2. Connect the test set for injection of three-phase currents to the current terminals of
the IED, which are connected to the CTs on the HV side of the power transformer.
3. Increase the current in phase A until the protection function operates and note the
operating current.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 107
Commissioning manual
To Next Page
Loading...
Need help?
General
