Applications for Transmission
Applications for Digital Transmission
2 Digital Line Interfaces (LID-1 and LID-2) are available through expansion of the Processing Unit (PU4) module
with the interface module to digital transmission paths, Digital Line Equipment (DLE).
The hardware interfaces X.21 (64 Kbps), G703.1 (64 Kbps), and G703.6 (2 Mbps HDB3-coded and balanced or
coaxial) are selectable on every LID, although only one can be used per LID.
The LID-1 can be operated alone or jointly with the LID-2 (multipath transmission). With multipath transmis-
sion, different line interfaces can be used for LID-1 and LID-2.
When using exclusively digital interfaces, up to 16 signal inputs can be transmitted transparently to the
distant station with operating mode 5D and can be routed to signal outputs there. 4 Interface Command
Modules IFC-P/D (for Binary I/O) or one EN 100 interface (for GOOSE I/O) are necessary for this application.
Applications for Analog and/or Digital Transmission
The SWT 3000 system is used for fast and reliable transmission of several commands for protection and special
switching functions in supply networks.
Protection functions
(Mode 1, Mode 2)
Commands can be transmitted for the protection of two 3-phase
systems (double system protection) or one 3-phase system (single
phase protection). High-voltage circuit breakers can be operated with
selective protection relays. This operation is designated as a permis-
sive protection system. Direct switch operation is also possible. This
operation is known as intertripping, transfer tripping, or direct trip-
ping.
4 commands with priority
(Mode 3)
It is possible to transmit 4 individual commands. Several commands
can be activated simultaneously. They are arranged according to
priority (input 1, 2, 3, and 4) and output one after the other.
Only one command active
(Mode 4)
Only one of the signal inputs 1 to 3 can be active in this operating
mode. Input 4 has priority and is treated independently of the states
of input 1 to 3. Therefore, if input 4 is active, the state of the other
inputs is insignificant. If more than one of the signal inputs 1 to 3 is
active and input 4 is inactive, an input error occurs. The guard tone
continues to be transmitted.
3 independent commands, 3iC
(Mode 5A)
3 signal inputs are available in this operating mode.
On the transmit side, every possible combination of signal input is
assigned to one specific protection frequency. On the receive side,
each protection frequency can be assigned to one or more signal
outputs (1 to 4).
4 independent commands, 4iC
(Mode 3a)
4 signal inputs are available in this operating mode.
On the transmit side, every possible combination of signal input is
assigned to a pair of protection frequencies. On the receive side, each
pair of protection frequencies is assigned to one or more signal
outputs. This function is only available with the coded tripping
feature.
2.2
2.2.1
2.2.2
Functional Description
2.2 Applications for Transmission
34
Smart Communication, SWT 3000 Teleprotection, Equipment Manual
C53000-G6040-C605-1, Edition 03.2020
