ABB Relion 670 Series Commissioning Manual page 106

Section 10
Testing functionality by secondary injection
For phase-to-ground measurement:
Vpickup
ANSIEQUATION2430 V1 EN-US
For phase-to-phase measurement:
Vpickup
ANSIEQUATION2431 V1 EN-US
5. Increase the measured voltage to rated load conditions.
6. Check that the PICKUP signal resets.
7. Instantaneously decrease the voltage in one phase to a value about 20% lower than the measured
trip 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 × Vpickup<.
( )
t s
ANSIEQUATION2428 V1 EN-US
where:
t(s)
TD1
V
Vpickup< Set pickup voltage for step 1
For example, if the measured voltage jumps from the rated value to 0.8 times the set pickup
voltage level and time multiplier TD1 is set to 0.05 s (default value), then the TRST1 and TRIP
signals trip 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 2 out of 3 and for 3 out of 3 operation mode.
10.5.1.2 Completing the test
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
100
The trip value in secondary volts is calculated according to the following equations:
<
VBase VT sec
´ ´
100 VTprim
3
<
VT sec
´ ´
VBase
100 VTprim
For example, if the inverse time curve A is selected, the trip signals TRST1 and TRIP
trip after a time corresponding to the equation:
TD 1
=
æ ö
V
-
1
ç ÷
<
Vpickup
è ø
Trip time in seconds
Settable time multiplier of the function for step 1
Measured voltage
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1MRK 505 372-UUS Rev. K
(Equation 15)
(Equation 16)
(Equation 17)
M13796-35 v8
M13796-25 v5
Busbar protection REB670
Commissioning manual