ABB REQ650 Commissioning Manual page 63

1MRK 505 293-UUS A
Commissioning manual
Instrument
transformer
angle error
ANSI06000651 V1 EN
Figure 11: Explanation of RCAcomp
Operation mode 3I
0
1. Set the polarizing voltage to 1.2 · VNRelPU and the phase angle between voltage and
current to the set characteristic angle (RCADir), the current lagging the voltage.
2. Measure that the operate 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.
The function activates the BFI_3P and STDIRIN outputs.
Measure with angles j = RCADir +/- 45° that the measuring element operates when
3.
· cos (RCADir - j) = 3I0 · 3V0 · cos(+/-45) = SN_PU.
3I · 3V
0 0
4. Compare the result with the set value. Take the set characteristic into consideration,
see figure 10 and figure 11.
a
RCAcomp
3I (to prot)
0
3I (prim)
0
· 3V · cosφ
0
Testing functionality
Operate area
-3V =V RCA = 0°
0 ref
Characteristic after
angle compensation
en06000651_ansi.vsd
Section 6
55