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Klein Vielen, Germany

Since 2001 DB Energie has renewed SCADA systems and control centres for the 16.7 Hz high and middle voltage grids supplying the German railways. This renewal based on digital substation automation, standardized data communication (IEC 60870-5-104) and the protocol TCP/IP.

The parallel conduct of 110 kV traction current overhead lines and 380 kV overhead lines on common transmission towers may lead in case of a contact between the systems to heavy damages and destructions of the 110 kV traction current network. Overvoltage arresters that are modified concerning their behaviour under electric arc discharges shall minimise the damages. Following a successful testing, the so-called sacrificial arresters shall be applied from 2016 in the high voltage network of DB Energie.

Xie J.,University of Ulm | Feng Y.X.,University of Ulm | Krap N.,DB Energie GmbH
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2010

The network impedance of power systems is an important quantity for many power system calculations. This paper presents a novel method for measuring network impedances of high-voltage (110 kV) power systems by injecting line-to-line test signals. The injected test signals are generated by a medium-frequency converter and fed to grid by a station transformer. During the measurement, we only assess the fundamental signal in order to ensure the measurement accuracy. As the transfer ratio of voltage and current transducers is questionable, we calibrate the total measurement system. The field tests show that the proposed method is suitable for measuring network impedances of high-voltage power systems. ©2010 IEEE.

Dib R.,Fachhochschule Gie.en Friedberg | Sassmannshausen A.,DB Energie GmbH | Scheel J.,Im Flur 5
eb - Elektrische Bahnen | Year: 2010

The DB installed its fi rst high-temperature conductor in its 110 kV network in 2002. The line was designed using the standard calculation methods for the sags. In the future high-temperature conductors will be used increasingly in high-voltage grids. When operating such conductors at high currents, more precise models for calculating the sags are recommended. The method presented hereafter uses a bilinear model for representing the behaviour of bimetallic conductors at high temperatures and determines the transition point above which the steel core alone carries the mechanical load. Above the transition point the tensile force is reduced to a lower extent than by standard calculations. The sag above the transition point will be determined more precisely.

DB Energie GmbH | Entity website

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