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ABB TU849 with factory sealed box

The protection unit receives the analog input signals of the phase currents IL1 (B3-B4), IL2 (B5- B6), IL3 B7-B8) and the current IE (B1-B2), phase voltages U1 (A3), U2 (A5), U3 (A7) with A2 as star point, each via separate input transformers. The constantly detected current measuring values are galvanically decoupled, filtered and finally fed to the analog/digital converter. 

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