Device Description and Features
Overview
The network protection disconnects the faulty part of the system as quick as possible in a selective way. These
faults occurring in high-voltage systems are simultaneously stored in an event list. As a consequence of higher
power plant outputs and the increasingly close interconnection of high-voltage power systems, high demands
are placed on network protection systems in terms of reliability and availability. Therefore, network protection
systems with absolute selectivity need a reliable and fast transmission system for the transfer of information
between the stations.
The SWT 3000 for teleprotection signaling in analog and digital communication networks offers the
required maximum security and reliability together with the shortest command transmission time. The SWT
3000 (in release SWT 3000R3.5 or higher) replaces all earlier SWT 3000 releases.
The device can be used as a stand-alone unit or can also be integrated in the PowerLink Power Line Carrier
(PLC) system.
Combinations of analog and digital interfaces are possible in both cases. The analog interface is operated in
the Voice Frequency (VF) range. The digital interfaces can be configured for X.21, G703.1 (64 Kbps), G703.6
(2 Mbps) or fiber-optic connection.
Quick Overview of the Features
Table 2-1
Quick Overview of the Features
Feature
Digital
Analog
Number of commands
Up to 16 Up to 4
Digital line interface
64 Kbps (X.21 or G703.1)
2 Mbps (G703.6 sym. 120 Ω, G703.6 asym. 75 Ω)
x
x
-
-
Ethernet line interface
100 Base-TX (electrical)
100 Base-FX (optical, short-range; 1310 nm)
x
x
Analog line interface
4-wire
2-wire
-
-
x
x
Fiber-optic interface
Long-range (single-mode, 1550 nm)
Short-range (single-mode, 1310 nm)
Short-range (multi-mode, 850 nm)
x
x
x
-
x
x
Transmission paths
Digital network
Direct connection to SDH multiplexer
Direct connection to PDH multiplexer
Fiber-optic cable
Power line carrier
Pilot cable
x
x
x
x
-
-
-
-
-
x
x
x
Integrated path protection (1 + 1)
x
x
Integration into PowerLink PLC system
x
x
Redundant power supply (hot standby)
x
x
2.1
2.1.1
2.1.2
Functional Description
2.1 Device Description and Features
32
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020