Abstract
In this paper by analyzing the topological structure made of smoothing reactor and DC-filter of HVDC transmission systems, we found that the structure of the filter is different when internal or external fault occurs. Furthermore the difference of the structure can result in the difference of the current. According to the difference of the current, a new rapid protection principle for HVDC transmission lines only using current signal from one-end is proposed. Simulation results and the verification results with field data show that the proposed protection principle can identify internal or external fault and it can identify the fault pole. It can operate rapidly, reliably, with high sensitivity and selectivity in different fault conditions.
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