Siemens SIPROTEC 7SC805, Руководство пользователя, Страница: 16 / 158

Introduction
1.2 Application Scope
SIPROTEC, 7SC805, Manual
C53000-G1140-C380-1, Release date 05.2014
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1.2 Application Scope
The Merging Unit(MU) device 7SC805 focuses on the sample values generation and transmission according
to IEC61850-9-2.
The SMV (Sample Measured Value) of 7SC805 can be synchronized via GPS or IRIG-B/PPS accurate to the mi-
crosecond.
7SC805 can also be time synchronized via GPS, IRIG-B protocol or via Ethernet interfaces with SNTP (Simple
Network Time Protocol ) accurate to the microsecond.
Commissioning operational usage is similar to the other SIPROTEC4 / DIGSI4 products. Additonally, an super-
vision 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 optional 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 on 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.
PortF
serves for process bus communication between merging unit and protection devices, measurement de-
vices, fault recorders, sample value receivers etc.. It can be operated via optical fiber. Standardized protocol
IEC 61850 is available for data transmission.