ABB Relion REG670, Commissioning Manual

Page: 167 / 262

-3U
0
=U
ref
Operate area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)

Characteristic after
angle compensation
RCAcomp
IEC06000651-3-en.vsd
RCADir = 0º
IEC06000651 V3 EN-US
Figure 58: Explanation of RCAcomp
Operation mode 3I
0
· 3U
0
· cos φ
SEMOD175060-76 v8
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
0
) and current (3I
0
) i.e. φ
´ =
RCADir-φ. Change φ´ to for example 45 degrees. Increase the injected current until
the function operates.
4. Compare the result with the set value and make sure that the new injected 3I
0
· 3U
0
· cos
φ is equal to the setting
SN>. Take the set characteristic into consideration, see figure
57
and figure 58 .
5. Measure the operate time of the timer by injecting 1.2 ·
UNRel> and a current to get two
times the set
SN> operate value.
( )
0 0
/ 3 3 cos
test test
Tinv kSN Sref I U
j
= × × ×
IECEQUATION2403 V1 EN-US
(Equation 78)
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
Off.
1MRK 502 067-UEN B Section 12
Testing functionality by secondary injection
161
Commissioning manual