ABB Relion 670 Series Applications Manual page 614

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Requirements

The standard does not define the sample rate for data, but in the UCA users group

recommendations there are indicated sample rates that are adopted, by consensus, in the

There are two sample rates defined: 80 samples/cycle (4000 samples/sec. at 50Hz or 4800

samples/sec. at 60 Hz) for a merging unit "type1" and 256 samples/cycle for a merging unit

"type2". The IED can receive data rates of 80 samples/cycle.

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.

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