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.
13.8.1.3 Overcurrent feature with voltage restraint
SEMOD56488-44 v5
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.
Overall check in principal as above (non-directional overcurrent feature)
3. Trip 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 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.
13.8.1.4 Overcurrent feature with directionality
SEMOD56488-60 v5
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 trip 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
1MRK 502 073-UUS A Section 13
Testing functionality by secondary injection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 239
Commissioning manual
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