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1MRK 506 355-UEN A
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
Instrument
transformer
angle error
IEC06000651 V3 EN
Figure 35:
Explanation of RCAcomp
Operation mode 3I
0
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
(3I
) i.e. φ´ = RCADir-φ. Change φ´ to for example 45 degrees. Increase the
0
injected current until the function operates.
4.
Compare the result with the set value and make sure that the new injected 3I
3U
· cos φ is equal to the setting SN>. Take the set characteristic into
0
consideration, see figure
RCAcomp
3I
(to prot)
3I
(prim)
0
0
· 3U
· cos φ
0
34
and figure 35.
Section 10
RCADir = 0º
Operate area
-3U
=U
0
ref
Characteristic after
angle compensation
IEC06000651-3-en.vsd
) and current
0
·
0
153
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