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.
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