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At a short circuit in an HVDC system modular multi-level converters with half-bridge submodules contribute to the short-circuit current even after blocking of the submodules. DC circuit breakers are therefore necessary for the interruption of the short-circuit current especially for the reliable operation of multi-terminal HVDC systems. In this paper a calculation method of important parameters of...
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...
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...
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