Overcurrent Feature With Current Restraint - ABB RET670 Commissioning Manual

Section 10
Testing functionality by secondary injection
10.8.1.2

Overcurrent feature with current restraint

The current restraining value has also to be measured or calculated and the influence on the
operation has to be calculated when the testing of the trip value is done.
Procedure
1. Trip value measurement
The current restraining value has also to be measured or calculated and the influence on the
operation has to be calculated when the testing of the trip value is done.
10.8.1.3 Overcurrent feature with voltage restraint
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
set.
Overall check in principal as above (non-directional overcurrent feature)
3. Trip value measurement
The relevant voltage restraining value (according to setting parameter
to be injected from the test set and the influence on the trip value has to be calculated when
testing of the trip value is done.
4. Trip time measurement
Definite times may be tested as above (non-directional overcurrent feature). For inverse time
characteristics the PICKUP 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.
10.8.1.4 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
or DirPrinc_OC2 set to or in a way that the trip value also is dependent on the angle between
current and polarizing voltage according to the I · cos(F) law (setting parameter
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
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
CTWYEpoint configuration parameter is set to ToObject .
180
CurrentInput and VoltageInput ) currents and voltages are created from the test
CurrentInput and VoltageInput ) currents and voltages are created from the test
1MRK 504 154-UUS B
SEMOD56488-35 v3
SEMOD56488-44 v5
VoltageInput ) has also
SEMOD56488-60 v5
DirPrinc_OC1
DirPrinc_OC1 or
Commissioning manual