11.4.6
Sensitive directional residual overcurrent and power protection
SDEPSDE
SEMOD175060-3 v7
Prepare the IED for verification of settings as outlined in section
IEC09000021-2-en.vsd
IED test set
NI
IED
NI
L1U
L2U
L3U
NU
U1
U2
U3
NU
TRIP
IEC09000021 V2 EN-US
Figure 23:
Principle connection of the test set
Values of the logical signals belonging to the sensitive directional residual overcurrent and power
protection are available on the local HMI under
Main menu /Test /Function status /Current
protection /SensDirResOvCurr(67N,IN>) /SDEPSDE(67N,IN>):x
11.4.6.1
Measuring the operate and time limit for set values
SEMOD175060-12 v2
Operation mode 3I
0
· cosφ
SEMOD175060-34 v9
Procedure
1.
Set the polarizing voltage to 1.2 ·
UNRel>
and set the phase angle between voltage and
current to the set characteristic angle (
RCADir
). Note that the the current lagging the voltage.
Take setting
RCAComp
into consideration if not equal to
0
.
2.
Inject current until the function picks up, and make sure that the operate current of the set
directional element is equal to the
INcosPhi>
setting.
The I Dir (3I
0
· cosφ) function activates the START and STDIRIN output.
3.
Assume that φ´ is the phase angle between injected voltage (3U
0
) and current (3I
0
) i.e. φ´ =
RCADir
-φ. Change φ´ to for example 45 degrees. Increase the injected current until the
function operates.
4.
Compare the result with the set value and make sure that the new injected 3I
0
· cos φ is equal
to the setting
INcosPhi>
..
Take the set characteristic into consideration, see Figure
5.
Measure the operate time of the timer by injecting a current two times the set
INcosPhi>
value
and the polarizing voltage 1.2 ·
UNRel>
.
1MRK 511 403-UEN Rev. L
Section 11
Testing functionality by secondary injection
Bay control REC670
93
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
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