Glossary
ACD
IEC 61850 data type: Directional protection activation information
ACK
Data transfer acknowledgment
ACT
IEC 61850 data type: Protection activation information
APC
Controllable analog set point information
ASDU
ASDU stands for Application Service Data Unit. An ASDU can consist of one or more identical information
objects. A sequence of the same information elements, for example measured values, is identified by the
address of the information object. The address of the information object defines the associated address of the
first information element of the sequence. A consecutive number identifies the subsequent information
elements. The number builds on this address in integral increments (+1).
BAC
Binary Controlled Analog Process Value
Back-up battery
The back-up battery ensures that specified data areas, flags, times and counters are kept retentive.
Bay Controller
Bay controllers are devices with control and monitoring functions without protection functions.
BCR
IEC 61850 data type: Binary counter reading
Best master clock algorithm
A PTP network contains communicating clocks. With the best master clock algorithm (BMC), the device indi-
cating the most precise time is determined. This device is used as a reference clock and is designated as grand-
master. If the network topology is changed, the BMC algorithm is executed again on network segments that
are possibly disconnected from the grandmaster. If a participating device is a master and a slave, it is called a
boundary clock.
SIPROTEC 5, Overcurrent Protection, Manual
1615
C53000-G5040-C017-8, Edition 07.2017
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