Capacitor Bank Protection Cbpgapc; Verifying The Settings And Operation Of The Function - ABB RET670 Commissioning Manual

1MRK 504 165-UEN A
11.5.14
11.5.14.1
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection

Capacitor bank protection CBPGAPC

Prepare the IED for verification of settings as outlined in section
test" in this chapter.
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.
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
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).

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
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.
Section 11
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