UL1
UL2
UL3
UN
UL1
UL1
UL2
UL3
IE
D
T
E
S
T
S
E
T
IE
D
IEC07000108-1-en.vsd
UL2
UL3
UN
1
2
IEC07000108 V2 EN-US
Figure 62: Connection of the test set to the IED for test of alarm levels, trip levels
and trip timer
where:
1
is three-phase voltage group1 (U1)
2
is three-phase voltage group2 (U2)
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.
The ALARM signal is delayed with timer
tAlarm
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.
Observe that the connections to U1 must be shifted to test another phase. (UL1 to UL2,
UL2 to UL3, UL3 to UL1)
12.6.5.3
Check of trip and trip reset timers
SEMOD175258-124 v2
Procdure
1.
Connect voltages to the IED according to valid connection diagram and figure
.
2.
Set Ur (rated voltage) to the U1 inputs and increase U2 voltage until 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.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
189
Commissioning manual
