Check Of Voltage Differential Trip And Alarm Levels - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
IEC07000107 V2 EN-US
Figure 28:
where:
1
2
2. Apply voltage higher than the highest set value of UDTrip, U1Low and U2Low to the U1 three-
phase inputs and to one phase of the U2 inputs according to figure 28.
The voltage differential START signal is set.
3. Decrease slowly the voltage in phase UL3 of the test set until the START signal resets.
4. Check U2 blocking level by comparing the voltage level at reset with the set undervoltage
blocking U2Low.
11.5.4.3

Check of voltage differential trip and alarm levels

Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 29.
126
UL1
UL2
UL3
UN
Connection of the test set to the IED for test of U2 block level
is three-phase voltage group1 (U1)
is three-phase voltage group2 (U2)
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UL1
UL2
1
UL3
UN
UL1
2
UL2
UL3
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Commissioning manual