ABB RET670 Commissioning Manual page 185

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
The I Dir (3I · cosφ) function activates the START and STDIRIN output.
0
3. Assume that φ´ is the phase angle between injected voltage (3U
(3I ) i.e. φ´ = RCADir-φ. Change φ´ to for example 45 degrees. Increase the
0
injected current until the function operates.
4. Compare the result with the set value and make sure that the new injected 3I
· cos φ is equal to the setting INcosPhi>..
Take the set characteristic into consideration, see Figure
5. Measure the operate time of the timer by injecting a current two times the set
INcosPhi> value and the polarizing voltage 1.2 · UNRel>.
×
kSN Sref
=
Tinv
×
3 I 3 U
0 test 0
IECEQUATION2402 V2 EN-US
6. Compare the result with the expected value.
The expected value depends on whether definite or inverse time was selected.
7. Set the polarizing voltage to zero and increase until the boolean output signal
UNREL is activated, which is visible in the Application Configuration in
PCM600 when the IED is in online mode. Compare the voltage with the set
value UNRel> .
8. Continue to test another function or complete the test by setting the test mode
to Off.
( )
×
j
cos
test
Section 11
) and current
0
0
45 and Figure 46.
(Equation 77)
179