Hitachi RED670 Commissioning Manual page 168

Section 11
Testing functionality by secondary injection
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 current is equal to the
INDir> setting for the set directional element.
The function activates the START and STDIRIN output.
Measure with angles j around RCADir +/- ROADir.
3.
4. Compare the result with the set values, refer to figure
5. Measure the operate time of the timer by injecting 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.
IEC06000652 V3 EN-US
Figure 46:
Non-directional earth fault current protection
Procedure
1. Measure that the operate current is equal to the INNonDir> setting.
The function activates the START and STDIRIN output.
2. Measure the operate time of the timer by injecting a current of 200% of the operate value.
3. Compare the result with the expected value.
The expected value depends on whether definite time tINNonDir or inverse time was selected.
4. Continue to test another function or complete the test by setting the test mode to Off.
162
and φ
0
Note that for operation, both the injected current and voltage must be greater than
the set values INRel> and UNRel> respectively.
= × ×
kSN Sref / 3 I 3 U
0 test 0 test
Example characteristic
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46
( )
j
×
cos
RCADir = 0º
ROADir = 80º
Operate area
3I
0
-3U
IEC06000652-3-en.vsd
1MRK 505 378-UEN Rev. K
for example characteristic.
0
Line differential protection RED670
Commissioning manual
SEMOD175060-87 v8
(Equation 82)
SEMOD175060-117 v10