城网改造中电缆入地工程存在的问题及对策

对城网改造中电缆入地工程在施工和管理中存在的一些问题进行分析,并提出在以后的项目实施时应采取的相应对策。     

Construction features and environmental factors influencingcorrosion on a self-contained fluid-filled submarine cable circuit inLong Island Sound

A 345 kV self-contained fluid-filled cable circuit was installed in an environment where corrosion of the armor may occur. To better understand the conditions that may result in corrosion, stray currents in the cable end zones and in the middle (submarine) of the circuit were measured, and cable samples were analyzed to determine the electrochemical activity of the cable's outer layers. The results of the project revealed that electrolytic corrosion would affect the semiconductive polyethylene if sufficient stray current density (greater than 0.15 A/m²) was induced by stray currents which were present in Long Island Sound where the cables are installed. Measurements revealed stray current densities in excess of this level towards one end of the cable route. Various other considerations for corrosion are also discussed     

美国康涅狄格至长岛轻型直流跨海电缆工程

介绍美国康涅狄格至长岛跨海电缆工程及其采用的轻型直流输电技术、系统设计及运行维护等。该工程于2002年建成投产,用于进行地区间的电力交易,是一个商业输电工程。该工程系统电压等级±150kV,输送容量330 MW,是目前为止容量最大、电压等级最高的轻型直流工程。工程采用了基于电压源换流器的直流技术,具有运行灵活、可以精确控制联络线传输容量的特点。     

The Metropolitan Transportation Authority's Program for Modernization of the Long Island Rail Road

The modernization of the Long Island Rail Road undertaken by the New York Metropolitan Transportation Authority provided a major replacement of passenger cars used in electrified service as well as the first major extension of electrified service in more than 40 years. Rehabilitation of electric power supplies, installation of communication equipment, station platform improvements, and track upgrading have been accomplished. Other projects will provide improved access to Manhattan and John F. Kennedy Airport.     

The 132 kV AC power cables and the optical fiber cable for thesubmarine intertie Italy-Elba Island

A 132 kV oil-filled submarine cable transmission system to supply power from mainland Italy (Piombino) to Elba island off its east coast and an associated fiber-optic submarine cable for telecommunication purposes are described. The power system comprises four single-core oil-filled cables and accessories, including an oil pumping plant with a cross-over system. Attention is focused on the system characteristics of the intertie, the environmental conditions and site survey, and the design, manufacture, installation and protection of the cable. Special attention is paid to the design and installation of the fiber-optic cable and its connection to an overhead line and to an exchange     

钢索式液压提升技术汽包吊装中的应用

介绍了利用GYT-100型钢索式液压提升装置吊汽包就位的作业程序和操作工艺,可供同类机组汽包吊装参考。     

Condition assessment of 12- and 24-kV XLPE cables installed during the 80s. Results from a joint Norwegian/Swedish research project

This paper reports the results from the condition assessment of 12- and 24-kV cross-linked polyethylene (XPLE) cables using a technique based on dielectric spectroscopy initially developed at KTH in Sweden. The work aims to examine whether the method could detect water tree degradation for the second generation medium voltage (MV) cables with long, but not bridging, water trees. While the overall cable condition was better than expected for second generation XPLE cables, water trees were found in most of the selected cables. The diagnostic method based on the measurement of the dielectric response could only detect water tree degradation in the examined second generation cables when the water trees bridged the insulation wall. Condition assessment above service stress may, in some cases, be required to detect bridging water trees. The results indicate that there is a correlation between the voltage level and the breakdown voltage of the cable. This can be used as a diagnostic criterion for this group of cables.     

长岛海缆和风电场对末端电压的影响与解决方案

风电场实际发电量受来风的影响从零至最大发电量之间变化,使风电场与主网连接点的电压变动率很大。长岛风电场通过110kV海缆与大陆主电网连接,由于电缆的电容电感分布参数加剧了电压的变化。当主网往风电场送电并且输送的无功较小时需要补偿感性无功以补充电缆的充电电容,而风电场往主网送电时在风电场处需补偿容性无功。     

Improving solar development policy and planning through stakeholder engagement: The Long Island Solar Roadmap Project

The Long Island Solar Roadmap Project involves a collaborative research approach with multiple organizational entities and actors engaged in a stakeholder driven process. Long Island is a space-constrained region with a steep urban to rural gradient, resulting in a complex suite of local governments, development priorities, and utility, planning, and development actors. This project is integrating technological, economic, and social data into a spatial planning output that allows decision makers to see where mid-to-large scale solar development (capacity of 250 kW and larger) is technically, economically, and socially feasible. This spatial output involves innovative methods of evaluating site suitability based on criteria developed by stakeholders. The project’s stakeholder and partnership driven approach allow the team to consider technological and economic feasibility across a wide variety of solar development forms and financial models. Social science data collected via a residential electric utility ratepayer survey is used to examine the perceptual barriers and opportunities for solar development as well as the sites and types of solar development that community members are most likely to support. The Long Island Solar Roadmap Project is an example of how research and community engagement can improve solar development policy and planning.     

N2/SF6混合气体在气体绝缘管道电缆中的应用

本文论述了N2/SF6混合气体的优点及其应用于气体绝缘管道电缆(GIC)的可能性,认为N2/SF6的混合气体应用于GIC具有重要的社会和经济意义。