Method of detecting a fault in a dedicated metallic return line or in an electrode line in a bipolar HVDC system and bipolar HVDC system comprising a fault detector

The method generates AC current in DMR or EL lines to measure current differences, addressing the inadequacies of existing fault detection in bipolar HVDC systems by ensuring reliable fault identification with minimal operational disruption.

WO2026125353A1PCT designated stage Publication Date: 2026-06-18HITACHI ENERGY LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HITACHI ENERGY LTD
Filing Date
2025-12-09
Publication Date
2026-06-18

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Abstract

A method of detecting a fault in a DMR line (6a-6e) or in an electrode line (13) in a bipolar HVDC system (1) comprises creating an AC current (iharm) in the DMR line (6a-6e) or in the electrode line (13) during bipolar operation of the HVDC system (1), measuring currents (i1, i2) at two or more locations in the DMR line (6a-6d) or in the electro de line (13), calculating the difference (DRMS) between the currents (i1, i2) and determining if the difference (DRMS) is larger than a pre-defined threshold level (L) for detecting a fault (12) in the DMR line (6a-6e) or in the electrode line (13).
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