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SUBESTACIÓN HUANCAVELICA 220/60/
10kV
MANUALDEEQUIPO
DE
T
ELE
COMUNICACION
E
S
SUBESTACIÓN
HUANCAVELICA
220/60/
10kV
.
CO U C C O S
EQUIPODETELEPROTECCIÓN
MARCA:SIEMENS
TIPO:SWT‐3000
BANCODEINFORMACIÓNTÉCNICA
DEPARTAMENTODETRANSMISIÓNESTE
Functional Description SWT 3000 Equipment Manual
Page - 2 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Contents:
Functional Description ------------------------------------------------------------------------------------------------------------ 4
Features at a glance ---------------------------------------------------------------------------------------------------------------- 5
Applications for analog and/or digital transmission------------------------------------------------------------------------- 6
Applications for digital transmission -------------------------------------------------------------------------------------------6
Combination of analog and digital interfaces---------------------------------------------------------------------------------- 7
Transmission paths---------------------------------------------------------------------------------------------------------------- 7
FOM (Fibre Optic Modem)------------------------------------------------------------------------------------------------------ 8
Connection to the PowerLink PLC System: -------------------------------------------------------------------------------- 8
Connection to a multiplexer -------------------------------------------------------------------------------------------------- 9
Direct connection via optical fibre connection ----------------------------------------------------------------------------10
Mode of operation: analog------------------------------------------------------------------------------------------------------10
Mode of operation: digital ------------------------------------------------------------------------------------------------------11
Features----------------------------------------------------------------------------------------------------------------------------11
Operating modes with PLC equipment ---------------------------------------------------------------------------------------11
Single purpose operation--------------------------------------------------------------------------------------------------------12
Multi-purpose operation---------------------------------------------------------------------------------------------------------12
Alternate multi-purpose operation ---------------------------------------------------------------------------------------------12
Equipment versions ---------------------------------------------------------------------------------------------------------------13
Broadband version ---------------------------------------------------------------------------------------------------------------13
Narrow band version-------------------------------------------------------------------------------------------------------------14
Applications for narrow band devices:----------------------------------------------------------------------------------------14
Possible ways of using the SWT 3000------------------------------------------------------------------------------------------16
Analog transmission path ----------------------------------------------------------------------------------------------------16
Digital transmission path-----------------------------------------------------------------------------------------------------16
Analog and digital transmission path---------------------------------------------------------------------------------------17
Integrated into the PowerLink PLC system--------------------------------------------------------------------------------17
Monitoring--------------------------------------------------------------------------------------------------------------------------18
Protection modes-------------------------------------------------------------------------------------------------------------------19
Unblocking mode ----------------------------------------------------------------------------------------------------------------20
Possible tripping codes used in the SWT 3000-------------------------------------------------------------------------------20
Description of the operating modes without unblocking mode ------------------------------------------------------------21
Mode1 (Double system protection)-----------------------------------------------------------------------------------------21
Mode2 (Single-phase protection) -------------------------------------------------------------------------------------------21
Mode3 (four commands with priority) -------------------------------------------------------------------------------------22
Mode 3a (four independent commands 4iC)-------------------------------------------------------------------------------22
Mode 3b (2plus2) -------------------------------------------------------------------------------------------------------------23
Mode4 (only one commands active)----------------------------------------------------------------------------------------23
Mode 5A “3 commands independent”--------------------------------------------------------------------------------------24
Mode 5D (only for digital line interfaces LID)----------------------------------------------------------------------------25
Description of the operating modes with unblocking mode ----------------------------------------------------------------26
Mode1 (Double system protection)-----------------------------------------------------------------------------------------26
Mode2 (Single-phase protection) -------------------------------------------------------------------------------------------26
Mode3 (four commands with priority) -------------------------------------------------------------------------------------27
Mode 3a (four independent commands 4iC)-------------------------------------------------------------------------------27
Mode 3b (2plus2) -------------------------------------------------------------------------------------------------------------28
Mode4 (only one commands active)----------------------------------------------------------------------------------------28
Mode 5A “3 commands independent”--------------------------------------------------------------------------------------29
Mode 5D (only for digital line interfaces LID)----------------------------------------------------------------------------30
Frequency overview---------------------------------------------------------------------------------------------------------------31
Broadband devices in the VF range [kHz]------------------------------------------------------------------------------------31
Narrow band devices in the VF range [kHz] ---------------------------------------------------------------------------------31
Frequency diagram for broadband and narrow band devices:--------------------------------------------------------------32
Command duration for single purpose operation ----------------------------------------------------------------------------33
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 3
Double system protection----------------------------------------------------------------------------------------------------33
Single-phase protection resp. operating mode 4 and M5A --------------------------------------------------------------33
Switching functions Mode 3-------------------------------------------------------------------------------------------------33
Mode 3a, 3b resp. 5A---------------------------------------------------------------------------------------------------------33
Command duration for alternate multi purpose operation ------------------------------------------------------------------33
Remote Monitoring (RM) and Service Channel (SC) ----------------------------------------------------------------------34
RM with analog interface -------------------------------------------------------------------------------------------------------34
RM with digital interface--------------------------------------------------------------------------------------------------------35
Service channel (SC) ------------------------------------------------------------------------------------------------------------35
The IP network – your gateway to SWT 3000 -------------------------------------------------------------------------------37
Power supply -----------------------------------------------------------------------------------------------------------------------38
Stand-alone unit ------------------------------------------------------------------------------------------------------------------38
Integrated unit --------------------------------------------------------------------------------------------------------------------38
Index: --------------------------------------------------------------------------------------------------------------------------------39
Appendix: ---------------------------------------------------------------------------------------------------------------------------41
List of figures---------------------------------------------------------------------------------------------------------------------41
List of tables ----------------------------------------------------------------------------------------------------------------------41
Functional Description SWT 3000 Equipment Manual
Page - 4 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Functional Description
The object of network protection is to selectively disconnect the faulty part of the system as
quickly as possible in the event of faults occurring in high-voltage systems. As a consequence of
ever higher power station outputs and the increasingly close interconnection of high-voltage net-
works very high demands are placed on network protection systems in terms of reliability and
availability. Network protection systems with absolute selectivity therefore 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 of-
fers the required maximum security and reliability together with the shortest command transmission
time. It replaces the two teleprotection signaling devices SWT 2000 F6 and SWT 2000 D.
The device can be used as a “stand-alone” unit or can also be integrated in the PowerLink PLC
system.
Combinations of analog and digital interfaces are possible in both cases. The analog interface is
operated in the VF range. The digital interfaces can be configured for X.21 or G703.1 (64kbit/s) or
G703.6 (2 Mbit/s).
SIEMENS
LID2 LID1
LIA
OK
SAL
EAL
S/N
>
>
SWT 3000
Figure 1: SWT 3000 device with analog interface
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 5
Features at a glance
Table 1: Features at a glance
Feature Digital Analog
Number of commands 8 4
Digital line interface
64 kbit/s (X.21 or G703.1)
2 Mbit/s (G703.6)
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
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 Power Line carrier system PowerLink x x
Redundant power supply (Hot standby) x x
Addressing for increased security x ---
INC (Impulse Noise Compression) --- x
Configuration of SWT 3000 with a service PC (intuitive Windows-
based user interface)
x x
Software-upgrade via service PC (download) x x
Free programmable output allocation x x
Remote access to SWT 3000 devices via TCP/IP link x x
Remote access to SWT 3000 devices via in band channel (SC) x ---
Real-time clock integrated and synchronizable from external
sources (e.g. GPS, IRIGB, NTP) and via the transmission link
x x
Event recorder (date- and time-stamped) with guaranteed data
storage when the power supply is switched off
x x
Remote readout of the event recorder x x
Easy upgrade from analog to digital (and vice versa) x x
SNMP agent for NMS integration x x
Coded tripping for up to four independent commands --- x
Functional Description SWT 3000 Equipment Manual
Page - 6 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Applications for analog and/or digital transmission
The SWT 3000 system is used for fast, reliable transmission of several commands for protection
and/or special switching functions in supply networks.
Protection functions: Commands can be transmitted for the protection of two three-phase sys-
tems (double system protection) or one three-phase system with single-
phase protection (single-phase protection). High-voltage power switches
can be operated in conjunction with selective protection relays. This is
designated as a "permissive protection system". Direct switch operation
is also possible. This is known as "intertripping", “transfer tripping" or “di-
rect tripping“.
Switching functions: It is possible to transmit four 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.
Operating mode 4 Only one of the signal inputs 1 to 3 may be active in this operating mode.
Input 4 has priority and is treated independently of the states of input 1 to
3. This means that if input 4 is active the state of the other inputs in insig-
nificant. If more than one of signal inputs 1 to 3 is active and input 4 is in-
active that is an input error. The idle tone (guard) continues to be trans-
mitted.
3 independent Three signal inputs are available in this operating mode.
commands On the transmit side every possible combination of signal input is as-
signed to a protection frequency. On the receive side each protection fre-
quency can be assigned to one or more signal outputs (1 to 4).
4 independent Four signal inputs are available in this operating mode.
commands On the transmit side every possible combination of signal input is as-
signed to a protection frequency. On the receive side each protection fre-
quency can be assigned to one or more signal outputs. This function is
only available with the coded tripping (CT) feature.
2plus2 mode This mode offers the transmission of two double systems. One is trans-
mitted in the fast permissive transfer trip, the other in the direct transfer
trip using the CT feature.
Information on assignment of the frequencies for the individual operating modes can be found in
the section “Protection operating modes”.
Applications for digital transmission
Two digital line interfaces (LID-1 and LID-2) are available through expansion of the PU3 module
with the interface module to digital transmission paths DLE (digital line equipment).
The hardware interfaces X.21 (up to 64kbit/s), G703.1 (64kbit/s) and G703.6 (2Mbit/s HDB3-
coded balanced or coaxial) can be selected 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). Operation with
different line interfaces is possible for LID-1 und LID-2 with multipath transmission. LID-1 is always
used if only one interface is needed.
When using exclusively digital interfaces up to 8 signal inputs can be transmitted transparently to
the distant station with Operating Mode 5D and can be jumpered to signal outputs there. Two in-
terface modules of type IFC-P and/or IFC-D are necessary for this application.
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 7
Combination of analog and digital interfaces
Multipath transmission can also be implemented in the SWT 3000 system by using the analog in-
terface (LIA) and the digital interface (LID-1). This combination, like only analog or only digital
transmission is possible for stand-alone SWT 3000 units and for units integrated (iSWT3) in the
PLC system PowerLink.
You will find a detailed overview of the equipment combinations with the resulting applications
in the section <Possible ways of using SWT 3000>.
Transmission paths
The following transmission paths can be used depending of the nature of the supply networks:
High-voltage and medium-voltage overhead lines
High-voltage and medium-voltage cables
Aerial and (buried) underground cables
Radio relay routes
Digital networks (SDH/PDH)
FO modem
This results in the following possible applications:
Table 2: Possible applications of the SWT 3000
Configuration Option
SWT 3000 stand-alone for analog route digital alternate route
SWT 3000 stand alone for digital route analog or digital alternate route
SWT 3000 integrated in PLC unit PowerLink analog digital alternate route
SWT 3000 integrated in PLC unit PowerLink digital analog or digital alternate route
SWT 3000 stand alone with connection via FOM digital alternate rout
SWT 3000 stand alone with connection via FOM to the Pow-
erLink
digital alternate rout
SWT 3000 stand alone with connection of the digital interface
via FOM to a PDH or SDH multiplexer
analog or digital alternate route
Functional Description SWT 3000 Equipment Manual
Page - 8 Edition p3_3_2x 08/09 © SIEMENS AG 2008
FOM (Fibre Optic Modem)
With the integrated fibre optic modems (FOM) it is possible to connect a SWT 3000 to the PLC
system PowerLink or to a multiplexer via fibre optic cables. The communication of two SWT 3000
units via fibre optic cables is also possible. A distance from 80 km can be covered.
Two FOM modules for the main and alternate path can be integrated into the SWT 3000. In this
case an other (broadened) backplane has to be used. In this case only one SWT 3000 can be in-
stalled in a module frame.
At slot FOM-1 alternatively the CLE module for the wired analog transmission can be inserted. For
applications without FOM modules the primary backplane is used. With it two SWT 3000 units can
be operated in one module frame.
With the FOM modules the following cases of operation can be carried out:
Connection to the PowerLink PLC System:
E
O
PU3f
FOM
Slot PU3f Slot FOx
Slot PU3f
FOM CSP
SWT 3000 PowerLink
<3km
Figure 2: Connection of the SWT 3000 via fibre optic cable to the PowerLink
The SWT 3000 is connected via fibre optic cables (for each transmission direction one fibre) to
the PowerLink. The functional performance of the SWT 3000 is like an integrated SWT i.e. all pos-
sible variants with iSWT can be carried out with the stand alone SWT 3000 via fibre optic cables.
The programming of the SWT 3000 in this case is only possible via PowerLink and the ser-
vice program PowerSys. In the PowerLink system two SWT 3000 can be connected via fibre op-
tic cables (iSWT (A) and iSWT (B)). The FOM modules are installed in the slots of the PU3f.
A digital alternate path can be electrical direct connected to the SWT 3000 or optical via a second
FOM.
The S6 control wire for the switch over in the alternate multi purpose operation is transmitted from
the FOM module to the PowerLink.
Fibre optic module: SFP-Module
Fibre type: multi mode with modules using 850nm wave length, single mode with
modules using 1300nm wave length
Wave length: 850 nm or 1300 nm
Opt. connector: LC-connector
Range: approx. 3 km at 1300nm, 550m at 850nm (depending on module type).
LED receiver alarm
2 x LED TX- and RX-Alarm (RX + F6UE-Alarm)
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 9
Connection to a multiplexer
E
O
PU3f
FOM
Slot PU3f Slot FOx
Slot PU3f
FOM
SWT 3000 FOB
<3km
C
o
n
v
e
r
t
e
r
RS422
DLE
Power Supply
Interface
converter
X.21
or
G.703.1
or
G.703.6
A
d
a
p
t
e
r
Figure 3: Connection of the SWT 3000 via optical fibre to a FO Box.
The SWT 3000 is operating via optical fibre and a fibre optic box (FOB) for the interface conver-
sion with a PDH- or SDH-Multiplexer. For each transmission direction a separate fibre is neces-
sary. The FOBox contains the FOM module with the electrical/optical conversion, the interface to
the multiplexer and a power supply.
An adaptor is installed for the conversion from the system connector to the alarm relay, the con-
nectors for the digital interface (X.21/G703.1/G703.6) and the power supply connector.
Fibre optic module: SFP-Module
Fibre type:
multi mode with modules using 850nm wave length, single mode with
modules using 1300nm wave length
Wave length: 850 nm or 1300 nm
Opt. connector: LC-connector
Range: approx. 3 km at 1300nm, 550m at 850nm (depending on module type).
LED receiver alarm
2 x LED TX- and RX-Alarm (RX + F6UE-Alarm)
Digital interface X.21, G703.1 or G703.6 selectable with jumpers
Bit rate 64 kbit/s or 2 Mbit/s
Clock FOBox is DTE (for test purpose a switch over to DCE possible)
Power Supply 48 V DC (
± 20 %), potential separation 2,5 kV
Functional Description SWT 3000 Equipment Manual
Page - 10 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Direct connection via optical fibre connection
E
O
PU3f
FOM
Slot PU3f Slot FOx
SWT 3000
<80km
C
o
n
v
e
r
t
e
r
RS422
DLE
PU3f
FOM
Slot PU3fSlot FOx
SWT 3000
RS422
DLE
C
o
n
v
e
r
t
e
r
E
O
Figure 4: Optical fibre connection SWT 3000 – SWT 3000
Two SWT 3000 are direct connected via optical fibre. The transmission is carried out with 2Mbit/s.
Fibre optic module: SFP-Module
Fibre type: Single mode
Wave length: 1300 nm or 1500 nm
Opt. connector: LC-connector
Range depending on SFP module and bit rate
LED: Receiver alarm
2 x LED: TX- and RX-Alarm (RX + F6UE-Alarm)
Clock: DTE or DCE adjustable
Mode of operation: analog
F6 Modulation:
The principle of F6 modulation (frequency-shift keying FSK) is applied
with the SWT 3000. Therefore only one of the possible frequencies is
ever transmitted. This enables the available transmit power to be used to
the full.
Security: The influence of burst interferences with amplitudes that can be signifi-
cantly greater than the wanted signal is suppressed. This is achieved by
limiting the amplitude of the input signal with the largest possible band-
width and then analyzing the frequency with a small bandwidth. Burst in-
terferences are generated, for example, by lightning strike or by switching
operations in high-voltage systems.
An optimum setting of the evaluation thresholds and the integration times
guarantees maximum security against unwanted tripping and a high de-
gree of reliability at the same time. Protection commands are still trans-
mitted in time despite serious interference.
Coded tripping (CT): The CT function is available for the analog line interface (LIA). The com-
mand codes consist of two simultaneously transmitted trip frequencies
(parallel coding).
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 11
Mode of operation: digital
General The digital line interfaces LID-1 and LID-2 are needed for transmitting the
protection commands over a digital network. The data for the interfaces
RM (Remote Maintenance) and SC (Service Channel) and system-
internal control information are transmitted additionally.
Transmission concept Information is transmitted over the digital interface by means of the peri-
odic transmission of 4 message types of constant length. The messages
have the following priority among themselves:
z Command transmission
z Service channel
z Remote maintenance
z System information
Command transmission Each command message is transmitted 4 times with a Hamming distance
of 4. The receiving end checks whether three identical command mes-
sages have been received. The command is not valid until this check has
been carried out.
Features
z
Frequency generation and evaluation by digital signal processor (DSP).
z Full utilization of the available transmit power since only one of the possible frequen-
cies is ever transmitted.
z Burst interferences with significantly greater amplitudes than the wanted signal is
largely suppressed.
z Noise analysis in the unused wanted signal circuits.
z Analog and/or digital line interfaces
z Alternative paths possible by combination of analog and digital interfaces.
z Event memory (Data retention over several days, at least 5 hours)
z It is also possible to read out the event memory remotely via RM or service channel.
z Configuration of the device with PC.
Operating modes with PLC equipment
Power system protection signals can be transmitted over the high-voltage and medium-voltage
overhead line to be protected in conjunction with PLC equipment. For this purpose the devices of
the SWT 3000 system are connected to special inputs and outputs of the PLC unit. In case of using
a PowerLink PLC system it is also possible to integrate SWT 3000 in PowerLink. When using PLC
equipment several variants of teleprotection signaling are possible as described in the following:
Functional Description SWT 3000 Equipment Manual
Page - 12 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Single purpose operation
In this operating mode the transmission band of the PowerLink is used exclusively for teleprotec-
tion signaling. The greatest transmission distances are reachable in this mode with maximum secu-
rity against impulse noise and minimum signal transmission time. The following equipment combi-
nations are possible:
1. SWT 3000 remote with VF connection to PowerLink
2. SWT 3000 integrated in PowerLink
Multi-purpose operation
In this operating mode the teleprotection signals are simultaneously transmitted with voice and
data signals. The distribution of the available transmission power between the services to be
transmitted results in shorter transmission ranges with the same signal transmission time as with
single purpose operation. The following equipment combinations are possible:
1. SWT 3000 remote with VF connection to PowerLink
2. SWT 3000 integrated in the PowerLink
Alternate multi-purpose operation
Normal operation:
In this operating mode the transmission band is used for the transmission
of voice and/or data so long as there is no protection case. In the idle
state, i.e. the high-voltage system is operating properly the signals of all
services including the guard tone are transmitted simultaneously. The pi-
lot of the PLC system is used as the guard tone in this operating mode.
Protection mode: If a protection command is to be transmitted voice transmission and, de-
pending on the parameters set, data transmission as well is interrupted
briefly while the protection command is being transmitted. The protection
command can thus be transmitted with the full transmission power avail-
able (this only applies to single-channel devices). If a voice connection is
set up it is not interrupted. This operating mode saves frequency space
but results in shorter transmission ranges and higher signal transmission
times than with single purpose or multi-purpose operation. The following
equipment combinations are possible:
Configurations: SWT 3000 remote at short distance with VF coupling to PowerLink. The
connecting cable between SWT 3000 and PowerLink should be kept as
short as possible.
SWT 3000 remote with optical fibre connection to the PowerLink.
SWT 3000 integrated in PowerLink.
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 13
Equipment versions
Equipment is available in broadband and narrow band versions depending on the application.
Broadband version
Application:
This equipment version is intended for operation over all communication
paths (4-wire connections ), preferably over PLC links. It offers a high
level of security against impulse interference and interference voltages.
Frequency space: In this equipment version the wanted frequencies are distributed over the
complete frequency space available. In conjunction with PLC transmis-
sion frequency space in the 2.5 kHz or 4 kHz channel arrangement is re-
quired for each operating direction.
With CF and radio relay routes and cable connections an ITU-T voice
band from 0.3 ... 3.4 kHz is used for each operating direction.
VF cable connections The following diagram shows a four-wire connection over a VF cable.
Broadband variants VF1 to VF5 can be used.
T
R
T
R
SWT 3000 SWT 3000
NFx NFx
NFx Frequency variant VF1 - VF5
T Transmitter
R Receiver
Figure 5: SWT 3000 four-wire connection via VF cable
PLC connections Variants VF1 to VF5 are used in conjunction with PowerLink PLC sys-
tems depending on the assignment of the transmission band.
Functional Description SWT 3000 Equipment Manual
Page - 14 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Narrow band version
Application:
Equipment in the narrow band version can be operated on VF links and
over CF and radio relay routes. Security against impulse noise and inter-
ference voltages is somewhat lower than with the broadband version.
Frequency space: The wanted frequencies are closer together in this equipment version. As
a result up to three of the 4 possible channels (channel 1, 2, 3) can be
operated simultaneously within an ITU-T voice band of 3.1 kHz band-
width (0.3 ... 3.4 kHz).
SWT unit: Each of these channels requires a separate SWT 3000 unit. There is
space for accommodating two SWT 3000 units in an equipment frame.
These two units are totally independent from one another and no compo-
nents are shared.
Multi-purpose: Use in conjunction with PLC transmission is possible in multi-purpose
operation. However, a smaller range (transmit level distribution for all
services) and less security against interference must be expected com-
pared with the broadband version.
Alternate multi-purpose: Use in conjunction with PLC transmission is not possible in alternate
multi-purpose operation.
Channel 4: Channel 4 can be used with a 4 kHz frequency space. Its position in the
VF frequency band is defined so that it is operated in the upper half of the
transmission bands 2.67 ... 3.7 kHz (voice band limitation 2.4 kHz with pi-
lot 2.58 kHz) and 2.1 ... 3.6 kHz (voice band limitation 2.0 kHz with pilot
3.78 kHz). In the second case another four 50 Bd WT channels can be
accommodated between the voice band and channel 4.
Applications for narrow band devices:
4-wire connections The operation of several units in parallel at a connection is possible by
using narrow band devices.
T
R
T
R
SWT 3000 SWT 3000
NB1
T
R
T
R
SWT 3000 SWT 3000
NB2
NB1
NB2
Figure 6: Parallel connection of several SWT 3000 units at one connection
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 15
2-wire connections 2-wire cable connections can be implemented with the narrow band ver-
sions of the SWT 3000.
T
R
T
R
SWT 3000 SWT 3000
NB12 NB21
NBx Narrowband Version
Figure 7: Example of a 2-wire connection with narrow band versions
In this case the receiver input of the SWT 3000 is connected parallel to
the transmitter output. Since there is only one wire pair available for the
transmit and receive direction, different frequencies must be used.
The variants listed in the following table are provided for this.
Table 3: Narrow band variants for VF 2-wire connections
Direction Variant NB12: Transmit channel 1 Receive channel 2
Reverse
direction
Variant NB21: Transmit channel 2 Receive channel 1
Direction Variant NB13: Transmit channel 1 Receive channel 3
Reverse direc-
tion
Variant NB31 Transmit channel 3 Receive channel 1
Direction Variant NB23 Transmit channel 2 Receive channel 3
Reverse direc-
tion
Variant NB32 Transmit channel 3 Receive channel 2
Functional Description SWT 3000 Equipment Manual
Page - 16 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Possible ways of using the SWT 3000
Analog transmission path
Figure 8: Examples using analog transmission path
Examples 1 and 2:
Pilot cable connections. For operation via pilot cable, two SWT 3000 devices can be linked di-
rectly through the analog inter faces (CLE).
Example 3:
The analog link (CLE) between two SWT 3000 devices can also be a PLC link. Depending on de-
vice configuration, SWT 3000 can be used with PowerLink in alternate multipurpose, simultaneous
multipurpose or single-purpose mode.
Example 4:
Fiber optic connections between SWT 3000 and PowerLink. A short-distance connection between
an SWT 3000 and Siemens’ PowerLink PLC terminal can be realized via an integrated fiber optic
modem. In this case an SWT 3000 standalone system provides the same advanced functionality as
the version integrated into PowerLink. Each PowerLink can be connected to two SWT 3000 de-
vices via fiber optics.
Digital transmission path
Figure 9: Examples using digital transmission path
Examples 5,6,7:
SWT 3000 digital connections. The digital interface (DLE) permits protection signals to be trans-
mitted over a PDH or SDH network.
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 17
Example 8:
Direct fiber optic connection between two SWT 3000 devices. SWT 3000 protection signaling in-
corporates an internal fiber optic modem for long distance trans-mission. The maximum distance
between two SWT 3000 devices is 150 km.
Example 9:
Fiber optic connection between an SWT 3000 and a MUX. A short distance connection of up to 3
km between an SWT 3000 and a multiplexer can be realized via an integrated fiber optic modem.
The multiplexer is connected with the SWT 3000’s FOBox, converting the optical signal to an elec-
trical signal.
Analog and digital transmission path
Figure 10: Examples for using analog and digital transmission path
Example 11:
Alternative transmission routes. SWT 3000 enables transmission of protection signals via two dif-
ferent routes. Both routes are constantly used. In the event that one route fails, the second route
immediately takes over without any loss of time. The digital interface (DLE) permits protection sig-
nals to be transmitted over a PDH or SDH network.
Example 12:
A short-distance connection between an SWT 3000 and Siemens’ PowerLink PLC terminal can
be realized via an integrated fiber optic modem. The multiplexer is connected with the SWT 3000’s
FOBox, converting the optical signal to an electrical signal.
Integrated into the PowerLink PLC system
Figure 11: Examples of integrated SWT 3000
Examples 13 and 14:
An SWT 3000 system can be integrated into the PowerLink equipment. Either the analog inter
face or the digital interface, or a combination of the analog and the digital interfaces, can be used.
Functional Description SWT 3000 Equipment Manual
Page - 18 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Monitoring
z Operating voltage
The output of commands from transmitter and receiver is disabled in case of failure
to meet the specified operating voltage tolerance.
z Switching command duration
The command outputs are disabled and an alarm triggered if a switching command
with a duration of > 500 ms is received (can be set as a parameter).
z Guard tone failure alarm
If there is no valid command frequency present a guard tone failure alarm is triggered
after about 10 ms.
z S/N ratio
A signal/noise alarm could be triggered (i.e. level ratio with AMP different, not with al-
ternate multi-purpose operation).
z Transmit level monitoring
The level of the transmit amplifier is monitored.
z Operating state
The operating state of the device is displayed on the front panel by means of differ-
ently coloured LED.
z Control contacts for external equipment
A floating normally open or normally closed contact (switchable) is available at the
device terminals for signaling the following alarms:
Pre- alarm
Receiver failure alarm
General alarm
z A signaling module IFC-S can be provided additionally as an option. With the aid of
this module any operation of the local circuit can be signaled externally via an auxil-
iary contact. (Note: maximum 2 interface modules possible)
z Measuring options
Decoupled measuring points at which the operating values can be monitored are ar-
ranged on the modules for start-up and maintenance of the unit.
z Input pulse suppression
Commands to be sent must be applied at the input for at least 1 ms in order to be
accepted as an input signal. This minimum time can be increased to 100 ms in steps
of 1 ms (settable as a parameter).
z Minimum transmission duration
Each command is transmitted for at least 15 ms (settable as a parameter).
SWT 3000 Equipment Manual Functional Description
© SIEMENS AG 2008 Edition p3_3_2x 08/09 Page - 19
Protection modes
The SWT 3000 system has the following different protective operating modes:
z Operating mode 1 (Double system protection) for the analog and/or digital interface.
The commands can be transmitted coded or uncoded with the application permissive
or direct tripping (selectable).
z Operating mode 2 (Single-phase protection) for the analog and/or digital interface.
The commands can be transmitted coded or uncoded with the application permissive
or direct tripping (selectable).
z Operating mode 3 (four commands with priority) for the analog and/or digital inter-
face. The commands are transmitted uncoded with the application permissive or di-
rect tripping (selectable).
z Operating mode 3a (4iC) for the transmission of four independent commands. The
commands are always transmitted coded with the application permissive or direct
tripping (selectable).
z Operating mode 3b (2plus2). This mode offers the transmission of two times mode 1.
Two commands are transmitted in the fast permissive transfer trip, the other two in
the direct transfer trip using the CT feature.
z Operating mode 4 (only one command active) for analog and/or digital interfaces.
The commands can be transmitted coded or uncoded with the application permissive
or direct tripping (selectable).
z Operating mode 5A (3 independent commands) for analog and/or digital interfaces.
The commands are transmitted uncoded with the application permissive or direct
tripping (selectable).
z Operating mode 5D (8 independent commands) only for operation with digital inter-
faces
Operating modes 1, 2, 3 and 4 were already used in the SWT 2000 F6 system. The new operat-
ing modes 3a, 3b resp. 5A are needed for variants that transmit 4 resp. 3 commands independ-
ently.
Operating mode 5D was previously used in the system SWT 2000 D.
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