Measuring The Trip And Time Limit Of Set Values; Completing The Test; Capacitor Bank Protection Cbpgapc - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
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11.4.15.2

Measuring the trip and time limit of set values

1. Check that the input logical signal BLOCK to the BRCPTOC (46) function block is logical zero and
note on the local HMI that the output signal TRIP from the BRCPTOC (46) function block is equal to
the logical 0.
2. Set the measured current (fault current) in one phase to about 110% of the set operating current
Pickup_PH.
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.
11.4.15.3

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.4.16

Capacitor bank protection CBPGAPC

Prepare the IED for verification of settings as outlined in section
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.
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
116
Product History
revision
2.2.4 -
2.2.4 -
2.2.5 A fixed time delay of 50 ms is added before asserting START signal.
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.
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"Preparing for test" in this chapter.
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