News from Japan

IF 2.6 4区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Electrical Insulation Magazine Pub Date : 2024-10-17 DOI:10.1109/MEI.2024.10721379

Yoshimichi Ohki

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引用次数: 0

Abstract

To address the swift expansion and critical demand for renewable energy, high voltage direct current (HVDC) electric power interconnections between power grids, nations, and even continents are set to assume a greater significance in ensuring a dependable and resilient power supply than they did in the previous decade. For instance, the inaugural 400-kV DC interconnection, linking Belgium and the UK using cables insulated with cross-linked polyethylene (XLPE), was established in 2019 [1] and has been operational to accommodate fluctuating power requirements, particularly in the UK. This HVDC link between Belgium and the UK, called the NEMO link, was constructed using innovative voltage source converters (VSC). On the other hand, numerous 350- to 450-kV HVDC systems employing conventional line-commutated converters (LCC) remain in the world, and some have been operated for over 25 years. In such LCC HVDC systems, cables insulated with oil-impregnated paper, such as self-contained fluid-filled (SCFF) or mass-impregnated (MI) cables, are used. However, some have deteriorated after a long service due to malfunctions such as oil migration and fatigue fracture of lead sheaths around insulation caused by heat cycles. In general, LCC, probably receiving lighter external stresses than undersea cables, seem to be more robust and require less maintenance than cable systems. Consequently, replacing outdated paper-insulated cables with XLPE cables is a beneficial upgrade, while keeping the same converter.

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日本新闻

为了应对可再生能源的快速扩张和关键需求，电网、国家甚至大陆之间的高压直流（HVDC）电力互联在确保可靠和弹性电力供应方面将比前十年发挥更大的作用。例如，使用交联聚乙烯（XLPE）绝缘电缆连接比利时和英国的首条 400 千伏直流互联线路于 2019 年建成[1]，并已投入运行，以满足波动的电力需求，尤其是英国的电力需求。这条连接比利时和英国的高压直流链路被称为 NEMO 链路，采用创新的电压源换流器（VSC）建造。另一方面，世界上仍有许多 350 千伏至 450 千伏的高压直流系统采用传统的线路换流器 (LCC)，其中一些已经运行了 25 年以上。在这些 LCC 高压直流系统中，使用的是油浸纸绝缘电缆，如自带充液（SCFF）或大规模浸渍（MI）电缆。然而，有些电缆在长期使用后，由于热循环导致绝缘层周围的油迁移和铅护套疲劳断裂等故障而老化。一般来说，LCC 承受的外部压力可能比海底电缆轻，因此似乎比电缆系统更坚固，所需的维护也更少。因此，在保持转换器不变的情况下，用 XLPE 电缆取代过时的纸绝缘电缆是一种有益的升级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Electrical Insulation Magazine 工程技术-工程：电子与电气

CiteScore

4.60

自引率

3.40%

发文量

121

审稿时长

>12 weeks

期刊介绍： The EI Magazine publishes articles written by authors from industry, research institutes and academia. The articles are more practical in content than the papers published in the Transactions. Usually three articles are published in each issue. The articles deal with dielectric materials, processes and new developments applied to industry products. Also the EI Magazine is used to promote upcoming conferences and solicits papers for the conferences. In addition, reports on past conferences are given in many issues. Book reviews and news items are included. An editorial is written by both the EIC and the President of DEIS in alternate issues. Advertising of insulation products appears in many issues.