Verifying The Settings And Operation Of The Function - ABB rec670 Commissioning Manual

Section 10
Testing functionality by secondary injection
10.4.15.1
110
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.
1MRK 511 360-UEN A
Bay control REC670 2.1 IEC
Commissioning manual