11.5.6.1 Measuring the trip 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 · VNRelPU 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 trip current of the set directional
element is equal to the INcosPhiPU setting.
The I Dir (3I
0
· cosφ) function activates the PICKUP and PUNDIN output.
3. Assume that φ´ is the phase angle between injected voltage (3V
0
) and current (3I
0
) i.e. φ´ =
RCADir-φ. Change φ´ to for example 45 degrees. Increase the injected current until the function
trips.
4. Compare the result with the set value and make sure that the new injected 3I
0
· cos φ is equal to
the setting INcosPhiPU..
Take the set characteristic into consideration, see Figure
48 and Figure 49.
5. Measure the trip time of the timer by injecting a current two times the set INcosPhiPU value and the
polarizing voltage 1.2 · VNRelPU.
Tinv
I V
test
=
⋅
⋅ ⋅
( )
TDSN SRef
3 3
0 0
cos
ϕ
ANSI13000294 V1 EN-US (Equation 81)
6. Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7. Set the polarizing voltage to zero and increase until the boolean output signal UNREL is activated,
which is visible in the Application Configuration in PCM600 when the IED is in online mode.
Compare the voltage with the set value VNRelPU .
8. Continue to test another function or complete the test by setting the test mode to Disabled.
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
174 Transformer protection RET670
Commissioning manual
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