ABB rec670 Commissioning Manual page 100

Section 10
Testing functionality by secondary injection
94
Instrument
transformer
angle error
IEC06000651 V3 EN
Figure 16: 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
15 and figure 16.
1MRK 511 360-UEN A
RCADir = 0º
Operate area
-3U =U
0 ref
Characteristic after
angle compensation
IEC06000651-3-en.vsd
) and current
0
Bay control REC670 2.1 IEC
Commissioning manual
·
0