用于敞开式变电站的特高压开关设备

UHV Switchgear Transmission Module for AIS

作为1100kV的UHV（特高压）输电，面临技术——生态环境的巨大挑战。变电站的UHV开关装置模块，需要的是可靠、成本／效益比好、环境友好、可维护的方案。对于这些所需的参数以及技术规范的验证，采用AIS（空气隔离变电所）技术能完全满足这些需要。 介绍由瓷柱式断路器、隔离开关和NCIT（非传统互感器）所组成的UHV模块。这些装置是根据模块原理预先设计好的，其中的设备间的连接肯定允许快速安装。在变电站设备控制和检测方面，模块是预制标准化。加拿大和德国的试验站对断路器、隔离开关等独立的开关元件，在1100kV上做BIL、SIL和工频等绝缘试验，性能表现非常优越。因为对于特高压电压等级，IEC标准至今尚未规定，所以将根据外推法和现场数据作合理解释。 瓷柱式断路器采用了最新复合绝缘体技术，在安全方面有所改进。AIS方案其他的关键技术，例如环境保护和成本，在可比的功能间，根据市场估计价值，与GIS解决方法作了比较。

UHV （Ultra High Voltage） as 1100 kV transmission levels represent an enormous technico-ecological challenge. UHV switchgear modules for substations needs reliable, cost effective environmental friendly and maintainable solutions. The combination of these demanding parameters together with the verification of the technical specification parameters can be best fulfilled with the AIS （Air Insulated Substation） technologies. This paper presents UHV modules made of live tank circuit breakers, disconnectors and NCIT （Non Conventional Instrument Transformers）. These devices are pre-designed on a modular basis where the interfaces are well defined to allow a very fast installation. The modules are pre-engineered with substation control and monitoring of equipment. Further within the paper, we will show the successful performance testing of the 1100 kV individual switchgear elements as the circuit breaker and the disconnector in testing stations in Canada and Germany for dielectric tests as such as BIL, SIL, and power frequency. As no IEC Standard yet exists for voltage class, the rational, based on extrapolation and field data, will be explained. It can be noted that the live tank circuit breaker includes the latest technologies of composite insulators, improving the safety aspect. Other technical key advantages of this AIS solution, such as environmental declarations and cost comparison based on estimated market values is made between comparable functions with a possible GIS solution.