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1MRK 504 165-UEN Rev. K
IEC07000108 V2 EN-US
Figure 53:
where:
1
2
2.
Apply 1.2 · Ur (rated voltage) to the U1 and U2 inputs.
3.
Decrease slowly the voltage of in phase UL1 of the test set until the ALARM signal is activated.
4.
Check the alarm operation level by comparing the differential voltage level at ALARM with the
set alarm level UDAlarm.
5.
Continue to slowly decrease the voltage until START signal is activated.
6.
Check the differential voltage operation level by comparing the differential voltage level at
START with the set trip level UDTrip.
7.
Repeat steps
Observe that the connections to U1 must be shifted to test another phase. (UL1 to UL2, UL2 to
UL3, UL3 to UL1)
11.6.5.4
Check of trip and trip reset timers
Procedure
1.
Connect voltages to the IED according to valid connection diagram and figure 53.
2.
Set Ur (rated voltage) to the U1 inputs and increase U2 voltage until the differential voltage is
1.5 · operating level (UDTrip).
3.
Switch on the test set. Measure the time from activation of the START signal until TRIP signal
is activated.
4.
Check the measured time by comparing it to the set trip time tTrip.
5.
Increase the voltage until START signal resets. Measure the time from reset of START signal to
reset of TRIP signal.
6.
Check the measured time by comparing it to the set trip reset time tReset.
Transformer protection RET670
Commissioning manual
UL1
UL2
UL3
UN
Connection of the test set to the IED for test of alarm levels, trip levels and
trip timer
is three-phase voltage group1 (U1)
is three-phase voltage group2 (U2)
The ALARM signal is delayed with timer tAlarm
1
to
6
to check the other phases.
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Testing functionality by secondary injection
UL1
UL2
1
UL3
UN
UL1
2
UL2
UL3
IEC07000108-1-en.vsd
Section 11
SEMOD175258-124 v2
201
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