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In this paper the short-circuit current of overhead transmission lines is analyzed at a short circuit in an HVDC transmission network. The analysis focuses solely on the current contribution of the transmission line at a line-to-earth or a line-to-line short circuit. In this context it is shown which impedance is effective at the corresponding fault case. Special attention is given to the frequency...
The developed method of risk-based asset replacement consists of the three major parts: availability & reliability calculations, asset risk determination with a Value at Risk (VaR) method and the multiple choice knapsack optimized replacement strategy developer. The transmission network availability & reliability calculations are carried out with multiple load flow scenarios which cover all...
In this paper the contribution of HVDC cables to the short-circuit current during a fault in an HVDC system is analyzed. The cable is implemented as a frequency-dependent model in a monopolar and bipolar configuration. The first part of the paper covers the calculation of the line parameters in dependence of the frequency. Special attention is given to the grounding of the sheath. In the second part...
This paper deals with the short circuit current contribution of different HVDC converter types at a fault on the DC side. The analysis covers both current source converters (CSC) and voltage source converters (VSC). Bipolar and monopolar configurations are considered. The influence of the AC and DC system parameters (SCR, AC system equipment, DC transmission line length etc.) on the short circuit...
This paper deals with the analysis of short circuit currents in radial HVDC networks. After the occurrence of a short circuit in a HVDC system different sources contribute to the resulting short circuit current. In this paper the various short circuit current sources with their corresponding fault currents are analyzed. The determination of short circuit currents is done by simulation in PSCAD®. The...
Power transmission capacity of overhead lines is limited by the maximal conductor temperature: should this maximal temperature be exceeded, unacceptable line sag as well as increased ageing of the conductor itself could result. This is especially the case for the most common steel reinforced conductors, where grease — used for protection against corrosion — may leak at high temperatures. Aside from...
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