Completing The Test; Capacitor Bank Protection Cbpgapc; Verifying The Settings And Operation Of The Function - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
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 IP>. 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 Off. 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 50Hz, 200MVAr, 400kV SCB with 500/1A 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
Connect the secondary test set to the CT inputs on the IED dedicated for the SCB currents. Single-
or three-phase test equipment can be used but it may be required to have facility to vary the
frequency of the injected current signal(s).
11.4.16.1

Verifying the settings and operation of the function

Reconnection inhibit feature
1. Inject SCB rated current (that is, 0.587A at 50Hz for this SCB) in at least one phase (preferably
perform this test with three phase injection).
2. After couple of seconds stop injection of all currents (that is, set all currents back to 0A).
3. Check that function binary output signal RECNINH is set to logical 1 and that only resets after
the set time under parameter tReconnInhibit (for example 300s for this SCB) has expired.
4. If this binary signal is used to prevent CB closing make sure that it is properly connected/wired
into the CB closing circuit.
Overcurrent feature
110
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.
Note that during testing the overcurrent feature the harmonic voltage overload
feature or reactive power overload feature may also give start and operate signals
depending on their actual settings. Therefore it is best to switch them off during this
test.
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1MRK 511 403-UEN Rev. L
GUID-00163D04-EBA8-4CD2-9B7A-B3EC15D32069 v2
"Preparing for test" in this chapter.
GUID-81B167DE-7A86-4CBA-86E7-560A6B3EA665 v1
GUID-C3E7B2EA-FF69-4D2B-BBDF-A135A97E4862 v2
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Bay control REC670
Commissioning manual
SEMOD175021-42 v4