ABB RET670 Commissioning Manual page 151

1MRK 504 154-UUS B
ANSI06000651 V2 EN-US
Figure 37: Explanation of RCAcomp
Operation mode 3I
1. Set the polarizing voltage to 1.2 ·
current to the set characteristic angle (
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
The function activates the PICKUP and PUDIRIN outputs.
3. Assume that φ´ is the phase angle between injected voltage (3V
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
equal to the setting
figure 37.
5. Measure the trip time of the timer by injecting 1.2 ·
the set
Commissioning manual
Instrument
transformer

angle error
3I (prim)
0
· 3V · cos φ
0 0
INRelPU and VNRelPU respectively.
SN_PU . Take the set characteristic into consideration, see figure
SN_PU trip value.
RCADir = 0º
Trip area
-3V =V
0
RCAcomp
Characteristic after
angle compensation
3I (to prot)
0
ANSI06000651-2-en.vsd
VNRelPU and set the phase angle between voltage and
RCADir ). Note that the current lagging the voltage.
VNRelPU and a current to get two times
Testing functionality by secondary injection
ref
) and current (3I
0
· 3V
0
Section 10
SEMOD175060-76 v8
) i.e. φ´ =
0
· cos φ is
0
36 and
145