-3V
0
=V
ref
Trip area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)
Characteristic after
angle compensation
RCAcomp
ANSI06000651-2-en.vsd
RCADir = 0º
ANSI06000651 V2 EN
Figure 46: Explanation of RCAcomp
Operation mode 3I
0
· 3V
0
· cos φ
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 power is equal
to the SN_PU setting for the set directional element.
Note that for pick-up, both the injected current and voltage must be greater than the
set values INRelPU and VNRelPU respectively.
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 187
Commissioning manual
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