Observe to not exceed the maximum permitted overloading of the current circuits in
the terminal.
3. Switch on the fault current and measure the operating time of BRCPTOC (46).
TRIP is controlled by Gate 13 in the configuration.
Use the TRIP signal from the configured binary output to stop the timer.
4. Compare the measured time with the set value tOper.
5. Activate the BLOCK binary input.
6. Switch on the fault current (110% of the setting) and wait longer than the set value
tOper.
No TRIP signal should appear.
7. Switch off the fault current.
8. Set the measured current (fault current) in same phase to about 90% of the set
operating current Pickup_PH. Switch off the current.
9. Switch on the fault current and wait longer than the set value tOper.
No TRIP signal should appear.
10. Switch off the fault current.
11.5.12.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to
Disabled. Restore connections and settings to their original values, if they were changed
for testing purposes.
11.5.13 Capacitor bank protection CBPGAPC
Prepare the IED for verification of settings as outlined in section
"Preparing for test" in
this chapter.
In this section it is shown how to test the capacitor bank protection function CBPGAPC
for application on a 60Hz, 200MVAr, 400kV SCB with 500/5A ratio CT.
Note that such SCB is shown in the application manual for this function.
The same procedure can be used to test SCB with some other rating and
different CT ratio.
As calculated in the application manual the base current for this particular SCB will be
289A on the primary side and 0.578A on the CT secondary side. Before any testing is
commenced make sure that setting IBase for this function is set to 289A (that is, setting for
the base current corresponds to the rated current of the protected SCB). It will be also
assumed that all other settings have values as shown in the setting example in the
application manual for this SCB.
Test equipment
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 201
Commissioning manual
To Next Page
Loading...
