Tinv I V
test test
= ⋅ ⋅ ⋅
( )
TDSN SRef 3 3
0 0
cos
ϕ
ANSIEQUATION2403 V2 EN-US (Equation 82)
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
0
and φ
SEMOD175060-87 v8
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.
Note that for pickup, both the injected current and voltage must be greater than the
set values INRelPU and VNRelPU respectively.
The function activates the PICKUPand PUDIRIN output.
3. Measure with angles j around RCADir +/- ROADir.
4. Compare the result with the set values, refer to figure
50 for example characteristic.
5. Measure the trip time of the timer by injecting a current to get two times the set SN_PU trip value.
Tinv I V
test test
= ⋅ ⋅ ⋅
( )
TDSN SRef 3 3
0 0
cos
ϕ
ANSIEQUATION2403 V2 EN-US (Equation 83)
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.
V
ref
=-3V
0
Operate area
3I
0
RCA = 0º
ROA = 80º
ANSI06000652-2-en.vsd
ANSI06000652 V2 EN-US
Figure 50: Example characteristic
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 177
Commissioning manual
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