-3V
0
=V
ref
RCA = 0°
Operate area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)
a
Characteristic after
angle compensation
RCAcomp
en06000651_ansi.vsd
ANSI06000651 V1 EN
Figure 11: Explanation of RCAcomp
Operation mode 3I
0
· 3V
0
· cosφ
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.
3. Measure with angles j = RCADir +/- 45° that the measuring element operates when
3I
0
· 3V
0
· cos (RCADir - j) = 3I0 · 3V0 · cos(+/-45) = SN_PU.
4. Compare the result with the set value. Take the set characteristic into consideration,
see figure
10 and figure 11.
1MRK 505 293-UUS A Section 6
Testing functionality
55
Commissioning manual
To Next Page
Loading...
Need help?
General
