IEC09000021-2-en.vsd
IED test set
NI
IED
NI
L1U
L2U
L3U
NU
U1
U2
U3
NU
TRIP
IEC09000021 V2 EN-US
Figure 56: 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
12.5.6.1
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>.
( )
0
0
cos
3
3
test
test
kSN Sref
Tinv
I
U
j
×
=
×
×
IECEQUATION2402 V2 EN-US
(Equation 77)
6.
Compare the result with the expected value.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
159
Commissioning manual
