ABB RELION 670 Series Commissioning Manual page 142

Section 10
Testing functionality by secondary injection
IEC06000651 V3 EN-US
Figure 35: 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 operate power is equal
to the
Note that for operation, both the injected current and voltage must be greater than the
set values
The function activates the START and STDIRIN outputs.
3. Assume that φ´ is the phase angle between injected voltage (3U
´ =
the function operates.
4. Compare the result with the set value and make sure that the new injected 3I
φ is equal to the setting
and figure 35.
5. Measure the operate time of the timer by injecting 1.2 ·
times the set
Tinv
IECEQUATION2403 V1 EN-US
6. Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7. Continue to test another function or complete the test by setting the test mode to
136
Instrument
transformer
angle error
3I (prim)
0
· 3U · cos φ
0 0
SN> setting for the set directional element.
INRel> and UNRel> respectively.
RCADir -φ. Change φ´ to for example 45 degrees. Increase the injected current until
SN> . Take the set characteristic into consideration, see figure
SN> operate value.
= × ×
kSN Sref / 3 I 3 U
0 test
RCADir = 0º
Operate area
-3U

RCAcomp
Characteristic after
angle compensation
3I (to prot)
0
IEC06000651-3-en.vsd
UNRel> and set the phase angle between voltage and
RCADir ). Note that the current lagging the voltage.
( )
j
×
cos
0 test
1MRK 505 345-UEN B
=U
0 ref
) and current (3I
0
UNRel> and a current to get two
Commissioning manual
SEMOD175060-76 v8
) i.e. φ
0
· 3U · cos
0 0
34
(Equation 78)
Off .