ABB RELION 670 Series Commissioning Manual page 100

Section 10
Testing functionality by secondary injection
For phase-to-earth measurement:
U
100
IECEQUATION2430 V1 EN-US
For phase-to-phase measurement:
U
100
IECEQUATION2431 V1 EN-US
5. Increase the measured voltage to rated load conditions.
6. Check that the START signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower than the
measured operate value.
8. Measure the time delay for the TRIP signal, and compare it with the set value.
9. Check the inverse time delay by injecting a voltage corresponding to 0.8 × U1<.
t s
( )
IECEQUATION2428 V1 EN-US
where:
t(s)
k1
U
U1<
For example, if the measured voltage jumps from the rated value to 0.8 times the set
start voltage level and time multiplier k1 is set to 0.05 s (default value), then the TR1 and
TRIP signals operate at a time equal to 0.250 s ± tolerance.
10. The test above can be repeated to check the inverse time characteristic at different
voltage levels.
11. Repeat the above-described steps for Step 2 of the function.
Extended testing
The tests above can be repeated for
10.4.1.2 Completing the test
Continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
94
The operate value in secondary volts is calculated according to the
following equations:
1 UBase VT sec
<
× ×
VTprim
3
VT
1 sec
<
UBase
× ×
VTprim
For example, if the inverse time curve A is selected, the trip signals TR1
and TRIP operate after a time corresponding to the equation:
k
1
=
U
 
1
−
 
U
1
<
 
Operate time in seconds
Settable time multiplier of the function for step 1
Measured voltage
Set start voltage for step 1
2 out of 3 and for 3 out of 3 operation mode.
1MRK 505 339-UEN B
(Equation 15)
(Equation 16)
(Equation 17)
M13796-35 v8
TestMode setting to Off .
Commissioning manual
M13796-25 v5