Hitachi Relion 670 Series Commissioning Manual page 101

1MRK 511 403-UEN Rev. L
IEC06000651 V3 EN-US
Figure 25:
Operation mode 3I
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
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
equal to the setting SN>. Take the set characteristic into consideration, see figure
25.
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.
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 Off.
Bay control REC670
Commissioning manual
Instrument
transformer

angle error
3I (prim)
0
Explanation of RCAcomp
· 3U · cos φ
0 0
= × ×
kSN Sref / 3 I 3 U
0 test 0 test
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RCADir = 0º
Operate area
-3U =U
0
RCAcomp
Characteristic after
angle compensation
3I (to prot)
0
IEC06000651-3-en.vsd
( )
× j
cos
Testing functionality by secondary injection
ref
) and current (3I ) i.e. φ´ =
0 0
· 3U
0 0
24
Section 11
SEMOD175060-76 v8
· cos φ is
and figure
(Equation 2)
95