Case Studies / A Telecommunication Project for Drava River Hydropower Plants
The European Bank supported a project for the renovation of the Drava River
Power Plants in 1993 with a loan. The first goal of the project was to
increase power production, followed by enlarging the variability of power
transmitted into the electrical network. This goal was achieved by using a
remote control system consisting of control-switching part and digital
The project's investor was Dravske Elektrarne Maribor (DEM). The public
tender for the communication network was released in 1995 and the winner
was Iskra Teling; the subcontractor for the transmission part of the network
was Iskra Transmission.
Network lay-out for the River Drava Hydropower Plants
The purpose of the intelligent digital network is to connect the chain of
eight power plants on the river Drava to the remote control center in Maribor,
to other power distribution networks in Slovenia, Austria and Croatia and to the
public telecommunications network. The project was started in 1995 and finished in 1996.
The network is set up with SparkWave digital radio-relay systems and SparkLine
optical transmission systems. Optical links along the river of Drava from KW
Schwabegg, Dravograd, and Formin to the Varaždin hydropower plant have been
established with two optical cables and SparkLine optical equipment. This also
ensures the connection to the Power Distribution Company of Maribor and Celje
and the connection to ELES (Elektro Slovenija). There are 82 installed SparkLine
Devices. The transmission capacity is 4x2 and 34 Mbit/s. Ring configurations of
SparkLine and SparkWave system ensure traffic protection in the case of system
or path outage.
SparkWave for the Drava River Power Plants Project - laboratory set-up
The backbone network to the Republic Remote Control Centre in Ljubljana was set
up with SparkWave 8 Mbit/s systems from three locations: Dravograd, Maribor and
Formin. Relay stations are at Plesivec, Pohorje and Kum mountains. The configuration
of all the links is 1+1 hot stand-by.
Multi-protection by optical SparkLine rings along the river Drava and SparkWave
radios ensures high system reliability. All Iskra Transmission devices have the
built-in SparkView Network Element Management System, ensuring additional high
quality and trouble-free operation.