ABB Relion 670 Series Applications Manual page 499

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1MRK 505 370-UUS Rev. K

Note that the IEC/UCA 61850-9-2LE standard does not specify the quality of the sampled values, only

the transportation. Thus, the accuracy of the current and voltage inputs to the merging unit and the

inaccuracy added by the merging unit must be coordinated with the requirement for actual type of

protection function.

Factors influencing the accuracy of the sampled values from the merging unit are for example anti

aliasing filters, frequency range, step response, truncating, A/D conversion inaccuracy, time tagging

accuracy etc.

In principle the accuracy of the current and voltage transformers, together with the merging unit, shall

have the same quality as direct input of currents and voltages.

Busbar protection REB670

Application manual

Requirements

Relion reb670