20.3 IEC/UCA 61850-9-2LE communication protocol
20.3.1 Introduction
Every IED can be provided with communication interfaces enabling it to connect to
the process buses in order to get data from analog data acquisition units close to the
process (primary apparatus), commonly known as Merging Units (MU). The protocol
used in this case is the IEC/UCA 61850-9-2LE communication protocol.
The IEC/UCA 61850-9-2LE standard does not specify the quality of the sampled
values. 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
the 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, will have the same quality as the direct input of currents and voltages.
The process bus physical layout can be arranged in several ways, described in Annex
B of the standard, depending on what are the needs for sampled data in a substation.
IEC06000537 V1 EN
Figure 325: Example of a station configuration with separated process bus and
station bus
1MRK 502 071-UEN - Section 20
Station communication
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 685
Application manual
To Next Page
Loading...
Need help?
General
