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Section 11
Testing functionality by secondary injection
Tinv
ANSIEQUATION2403 V2 EN-US
6.
Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7.
Continue to test another function or complete the test by setting the test mode to Disabled.
Operation mode 3I
1.
Set the polarizing voltage to 1.2 · VNRelPU and set the phase angle between voltage and current
to the set characteristic angle (RCADir). Note that the current lagging the voltage.
2.
Inject current until the function picks up, and make sure that the trip current is equal to the INRelPU
setting for the set directional element.
The function activates the PICKUPand PUDIRIN output.
Measure with angles j around RCADir +/- ROADir.
3.
4.
Compare the result with the set values, refer to figure
5.
Measure the trip time of the timer by injecting a current to get two times the set SN_PU trip value.
Tinv
ANSIEQUATION2403 V2 EN-US
6.
Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7.
Continue to test another function or complete the test by setting the test mode to Disabled.
ANSI06000652 V2 EN-US
Figure 30:
114
=
TDSN SRef 3
⋅
⋅
3
I
V
0
test
0
and φ
0
Note that for pickup, both the injected current and voltage must be greater than the set
values INRelPU and VNRelPU respectively.
=
TDSN SRef 3
⋅
⋅
3
I
V
0
test
0
Example characteristic
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( )
⋅
cos ϕ
test
30
( )
⋅
cos ϕ
test
RCA = 0º
ROA = 80º
Operate area
3I
0
V
ref
ANSI06000652-2-en.vsd
1MRK 511 409-UUS Rev. K
for example characteristic.
=-3V
0
Phasor measurement unit RES670
Commissioning manual
(Equation 78)
SEMOD175060-87 v8
(Equation 79)
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