Overcurrent Feature With Directionality - ABB RELION REC650 Commissioning Manual

1MRK 511 425-UEN A
9.3.1.4
Bay control REC650 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
1. Connect the test set for injection of three-phase currents and three-phase
voltages to the appropriate current and voltage terminals of the IED.
2. Inject current(s) and voltage(s) in a way that relevant measured (according to
setting parameter CurrentInput and VoltageInput) currents and voltages are
created from the test set.
Overall check in principal as above (non-directional overcurrent feature)
3. Operate value measurement
The relevant voltage restraining value (according to setting parameter
VoltageInput) has also to be injected from the test set and the influence on the
operate value has to be calculated when testing of the operate value is done.
4. Operate time measurement
Definite times may be tested as above (non-directional overcurrent feature).
For inverse time characteristics the START value (to which the overcurrent
ratio has to be calculated) is the actual pickup value as got with actual
restraining from the voltage restraining quantity.

Overcurrent feature with directionality

Please note that the directional characteristic can be set in two different ways either
just dependent on the angle between current and polarizing voltage (setting
parameter DirPrinc_OC1 or DirPrinc_OC2 set to or in a way that the operate
value also is dependent on the angle between current and polarizing voltage
according to the I · cos(F) law (setting parameter DirPrinc_OC1 or DirPrinc_OC2
set to I · cos(F). This has to be known if a more detailed measurement of the
directional characteristic is made, than the one described below.
Procedure
1. Connect the test set for injection of three-phase currents and three-phase
voltages to the appropriate current and voltage terminals of the IED.
2. Inject current(s) and voltage(s) in a way that relevant measured (according to
setting parameter CurrentInput and VoltageInput) currents and voltages are
created from the test set.
3. Set the relevant measuring quantity current to lag or lead (lag for negative
RCA angle and lead for positive RCA angle) the relevant polarizing quantity
voltage by an angle equal to the set IED characteristic angle (rca-dir) when
forward directional feature is selected and the CTstarpoint configuration
parameter is set to ToObject.
If reverse directional feature is selected or CTstarpoint configuration
parameter is set to FromObject, the angle between current and polarizing
voltage shall be set equal to rca-dir+180°.
4. Overall check in principal as above (non-directional overcurrent feature)
5. Reverse the direction of the injection current and check that the protection
does not operate.
6. Check with low polarization voltage that the feature becomes non-directional,
blocked or with memory according to the setting.
Section 9
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