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Section 10
Testing functionality by secondary injection
IEC15000256 V1 EN-US
Figure 29:
Operation mode 2I
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 current shall lag the voltage.
2.
Inject current until the function picks up, and make sure that the operate power is equal to the
SN> setting for the set directional element.
The function activates the START and STDIRIN outputs.
3.
Assume that φ is the phase angle between injected voltage (2U
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 2I
equal to the setting SN>. Take the set characteristic into consideration, see Figure
Figure 29.
5.
Measure the operate time of the timer by injecting 1.2 · UNRel> and a current to get two times
the set SN> operate value.
T
inv
IECEQUATION235 V1 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 Off.
106
Instrument
transformer
angle error
2I
(prim)
0
Explanation of RCAcomp
· 2U
· cos φ
0
0
Note that for operation, both the injected current and voltage must be greater than
the set values INRel> and UNRel> respectively.
kSN
S
2 /
I
2
U
ref
0
test
0
test
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Operate area
-2U
=U
0
RCAcomp
Characteristic after
angle compensation
2I
(to prot)
0
cos
1MRK 506 377-UEN Rev. L
RCADir = 0º
ref
IEC15000256-1-en.vsdx
GUID-0BB47FD3-AF84-47BC-8983-68CA6F50172C v2
) and current (2I
0
· 2U
0
Railway application RER670
Commissioning manual
) i.e. φ =
0
· cos φ is
0
28
and
(Equation 4)
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