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1MRK502053-UEN B
12.2
12.3
12.3.1
12.3.1.1
Generator protection REG670 2.0 IEC
Commissioning manual
Testing functionality by secondary injection
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.
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.
Differential protection
Transformer differential protection T3WPDIF
Prepare the IED for verification of settings outlined in section
section
"Preparing for test"
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 is set to Off and that the four step residual overcurrent function
EF4PTOC under Main menu/Test/Function test modes/Current protection
is set to Off, since they are configured to the same current transformer inputs as
the transformer differential protection. Make sure that the transformer
differential functions T2WPDIF or T3WPDIF 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 L1 until the protection function operates and note
the operating current.
4.
Check that the trip and alarm contacts operate according to the configuration
logic.
5.
Decrease the current slowly from operate value and note the reset value.
Depending on the power transformer vector group (Yd and so on), the single-
phase injection current may appear as differential current in one or two phases
and the operating value of the injected single-phase current will be different.
6.
Check in the same way the function by injecting current in phases L2 and L3
respectively.
7.
Inject a symmetrical three-phase current and note the operate value.
in this chapter.
Section 12
"Requirements"
and
105
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Troubleshooting
