-3U
0
=U
ref
Operate area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)
Characteristic after
angle compensation
RCAcomp
IEC06000651-3-en.vsd
RCADir
= 0º
IEC06000651 V3 EN
Figure 45:
Explanation of RCAcomp
Operation mode 3I
0
· 3U
0
· cos φ
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
lagging 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.
Note that for operation, both the injected current and voltage must be greater
than the set values
INRel>
and
UNRel>
respectively.
The function activates the START and STDIRIN outputs.
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
·
3U
0
· cos φ is equal to the setting
SN>
. Take the set characteristic into
consideration, see figure
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
156
Generator protection REG670 2.0 IEC
Commissioning manual
Содержание REG670 2.0 IEC
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