Application Scope - Siemens SIPROTEC 6MU805 User Manual

Introduction

1.2 Application Scope

1.2 Application Scope
The Merging Unit (MU) device 6MU805 focuses on the sample values generation and transmission according
to IEC 61850-9-2.
The SV (Sample Value) synchronization of 6MU805 can be realized via GPS or IRIG-B/PPS accurate to the
microsecond.
The time synchronization of 6MU805 can be realized via GPS, IRIG-B protocol or via Ethernet interfaces with
SNTP (Simple Network Time Protocol).
Commissioning operational usage is similar to the other SIPROTEC4/DIGSI4 products. To ensure a continu-
ously stable operation of Merging Unit, Siemens recommends disconnecting the DIGSI via switching it to off-
line mode or exiting the DIGSI program after the 6MU805 device is configured. Additonally, a supervision of
time signals is supported.
Control Functions
The device provides a control function which can be used to activate and deactivate switching devices via the
operation panel, the Web Monitor, port F, binary inputs, and the USB interface using DIGSI.
The status of the primary equipment can be transmitted to the device via auxiliary contacts connected to binary
inputs. The present status (or position) of the primary equipment can be displayed on the device, and used for
interlocking or alarm condition monitoring. The number of operating equipments to be switched is limited by the
binary inputs and outputs available in the device or the binary inputs and outputs allocated for the switch posi-
tion indications. Depending on the primary equipment being controlled, one binary input (single point indication)
or two binary inputs (double point indication) may be used for this process.
The capability of switching primary equipment can be restricted by a setting associated with switching authority
(Remote or Local), and by the operating mode (interlocked/non-interlocked, with or without password request).
Processing of interlocking conditions for switching (e.g. switchgear interlocking) can be established with the aid
of integrated, user-configurable logic functions.
The service interlocking function allows you to block switching operations which can be triggered for the con-
figured switching devices via the device.
Indications and Measured Values
The operational indications provide information about conditions in the power system and the device. Measure-
ment quantities and values that are calculated can be displayed locally and communicated via the serial inter-
faces.
Device indications can be processed externally via output contacts (routable), linked with user-definable logic
functions, and/or issued via various interfaces. Furthermore, indications can be output to a number of LEDs
(routable) and displayed on the operation panel or using the Web Monitor.
Communication
The following interfaces are available for communication with external operating, control and memory systems.
Local communication with a PC is possible via the USB-DIGSI interface in the front. The DIGSI 4 operating
software enables you to perform all operational and evaluation tasks, for example, entering and modifying con-
figuration and setting parameters, configuring user-specific logic functions, reading out operational indications,
fault indications and measured values, reading out and displaying fault records, retrieving device conditions
and measured values, issuing control commands.
MU supports two optical Ethernet Interfaces for process bus communication.
Port F serves for process bus communication between merging unit and IEC 61850 GOOSE and SV
subscribers, for example, protection devices, measurement devices or fault recorders. It can be operated via
optical fiber. Standardized protocol IEC 61850 is available for data transmission.
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SIPROTEC, 6MU805, Manual
C53000-G1140-C380-5, Release date 06.2018