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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.
10.5.1.4
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
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.
10.5.1.5
Over/Undervoltage feature
Procedure
1MRK 504 160-UEN -
Section 10
Testing functionality by secondary injection
Transformer protection RET650 2.1 IEC
83
Commissioning manual
Содержание RET650 2.1 IEC
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