Function Revision History; Check Of Undervoltage Levels - Hitachi RET670 Commissioning Manual

Section 11
Testing functionality by secondary injection
11.6.5.1

Function revision history

Document
revision
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B
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J
11.6.5.2

Check of undervoltage levels

This test is relevant if the setting BlkDiffAtULow = Yes.
Check of U1Low
Procedure
1. Connect voltages to the IED according to valid connection diagram and figure 51.
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 51.
The voltage differential START signal is set.
198
Product History
revision
2.2.1 -
2.2.1 -
2.2.2 -
2.2.3 -
2.2.3 -
2.2.4 -
2.2.4 -
2.2.5 -
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1MRK 504 165-UEN Rev. K
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Transformer protection RET670
Commissioning manual