ABB RET670 Commissioning Manual page 188

Section 11
Testing functionality by secondary injection
182
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 kSN Sref / 3
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.
Operation mode 3I
0
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.
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 output.
Measure with angles j around RCADir +/- ROADir.
3.
4. Compare the result with the set values, refer to figure
characteristic.
5. Measure the operate time of the timer by injecting a current to get two times
the set SN_> operate value.
= ×
Tinv kSN Sref / 3
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.
( )
× × j
I 3 U cos
0 test 0 test
and φ
( )
j
× ×
I 3 U cos
0 test 0 test
1MRK 504 165-UEN A
(Equation 78)
SEMOD175060-87 v8
47 for example
(Equation 79)
Transformer protection RET670 2.2 IEC
Commissioning manual