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Title: New protection method for HVDC lines including cables

New protection method for HVDC lines including cables For the third project of the Hokkaido-Honshu HVDC Link in Japan, called the HVDC Link III project (rated at 250 kVdc-1,200 A-300 MW), the authors developed an HVDC transmission line protection method based on a new working principle that allows high-speed and highly sensitive detection of faults, enhancing reliability in the supply of electric power. In general, increasing the sensitivity of relays will lead to an increased likelihood of undesired operation whereas lowering the sensitivity will impair the responsiveness of the relays. The proposed method meets these apparently incompatible requirements very well. Basically classified as a differential scheme, the HVDC transmission line protection method compensates for a charging and discharging current that flows through the line-to-ground capacitance at times of voltage variations caused by a line fault or by the operation of dc power systems. The developed protection method is also characterized in that it uses current changes induced by voltage variations to restrain the operation of a relay. This configuration has made the proposed method far superior in responsiveness and sensitivity to the conventional protection method. A simulation using an EMTP (Electro-Magnetic Transients Program) was conducted on this method. Developed relay equipment embodying the new protection method was subjected more » to various verification tests, where this equipment was connected to a power system simulator, before being delivered to the HVDC Link III facility. « less
Authors: ; ; ;
Publication Date:
OSTI Identifier:OSTI ID: 152960
Report Number(s):CONF-950103--
Journal ID: ITPDE5; ISSN 0885-8977; TRN: IM9602%%140
Resource Type:Journal Article
Resource Relation:Journal Name: IEEE Transactions on Power Delivery; Journal Volume: 10; Journal Issue: 4; Conference: Winter meeting of the IEEE Power Engineering Society, New York, NY (United States), 29 Jan - 2 Feb 1995; Other Information: PBD: Oct 1995
Country of Publication:United States
Language:English
Subject: 24 POWER TRANSMISSION AND DISTRIBUTION; HVDC SYSTEMS; POWER TRANSMISSION LINES; EQUIPMENT PROTECTION DEVICES; COMPUTERIZED SIMULATION; ELECTRICAL TRANSIENTS