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ABB DI810-EA 100% brand new DI810
The residual voltage UE required for determining earth fault direction can be measured in three different
ways, depending on the voltage transformer connections.
(refer to Table 4.1: Connection of the voltage transformers). Total current can be measured by
connecting the unit either to a ring core C.T. or to cur-rent transformers in a Holmgreen circuit.
However, maximum sensitivity is achieved if the MRl1 protective device is connected to a ring core
C. T.
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