Application
A condition monitoring system (CMS) has been designed and installed as part of a new 245kV power cable circuit in Stockholm, Sweden by LIOS Technology. The principal aim of the CMS is to provide real time monitoring of cable conditions, and to assist in asset management to ensure reliable cable operation. The major features of the CMS are the cable temperature monitoring and prediction functions based on a distributed temperature sensing system (DTS).
In October 2006 the commissioning of the integrated RTTR solution for real-time monitoring of cables was successfully completed. Together with a Distributed Temperature Sensor (DTS) from LIOS Technology of Germany, a parallel run of cables installed in a tunnel near Stockholm is being continuously rated by RTTR.
The RTTR calculation engine is supplied by CYME of Canada. The cable installation, owned by the Swedish utility Fortum consists of 3 km of a double circuit of 245 kV cables fitted with optical fiber sensors installed in a 20 m deep tunnel. The DTS measures the temperature external to the jacket of the cables and the ambient temperature of the tunnel. Real time temperature and current readings serve to compute the temperature of the conductor and perform emergency ratings looking into the future.
