ABB REQ650 1.3 IEC, Commissioning Manual

Page: 57 / 124

-3U
0
=U
ref
Operate area
Instrument
transformer
angle error
3I
0
(prim)
3I
0
(to prot)
a
Characteristic after
angle compensation
RCAcomp
en06000651.vsd
RCADir = 0º
IEC06000651 V2 EN-US
Figure 11: Explanation of RCAcomp
Operation mode 3I
0
· 3U
0
· cosφ
SEMOD175060-76 v6
1. Set the polarizing voltage to 1.2 ·
UNRel> 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> 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. Measure with angles j = /- 45° that the measuring element operates when 3I
0
·
3U
0
· cos (
RCADir -
j ) = 3I0 · 3U0 · cos(+/-45) =
SN>.
4. Compare the result with the set value. Take the set characteristic into consideration, see
figure 10 and figure 11 .
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 2)
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.
Operation mode 3I
0
and φ
SEMOD175060-87 v6
1MRK 505 293-UEN B Section 7
Testing functionality
Breaker protection REQ650 51
Commissioning manual
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