ABB REB670 Commissioning Manual page 119

1MRK 505 372-UEN A
Busbar protection REB670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
Verification of start value and time delay to operate for Step 1
1. Check that the IED settings are appropriate, especially the START value, the
definite time delay and the 1 out of 3 operation mode.
2. Supply the IED with three-phase voltages at their rated values.
3. Slowly decrease the voltage in one of the phases, until the START signal
appears.
4. Note the operate value and compare it with the set value.
The operate value in secondary volts is calculated according
to the following equations:
For phase-to-earth measurement:
U UBase VT
1 sec
<
× ×
100 VTprim
3
IECEQUATION2430 V1 EN-US
For phase-to-phase measurement:
U 1 VT sec
<
UBase
× ×
VTprim
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<.
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
t s
( )
=
U
 
1
−
 
U 1
<
 
IECEQUATION2428 V1 EN-US
where:
t(s) Operate time in seconds
k1 Settable time multiplier of the function for step 1
U Measured voltage
U1< Set start voltage for step 1
Section 10
M13796-29 v10
(Equation 15)
(Equation 16)
(Equation 17)
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