用于发电中心大规模电力输送的气体绝缘输电线路

Gas insulated transmission lines: bulk power transmission in power generation centres

在大型(巨型)城市中,用电负荷持续增长,有些城市中心的用电负荷甚至超过了每年10%的增长率,但城市内的可用空间却在持续减少。这种巨型城市的供电可靠性依赖于连接到负荷中心的大功率传输的可能性。根据巨型城市的规模,地下输电的传输距离已达到10km或20km,甚至更长,将会是未来常用的供电方式。气体绝缘输电线路(GIL)提供了满足大功率及地下安装需求的解决方案。这种方式在世界范围内的应用已有30多年的历史。尤其是GIL提供了针对"最后一英里"的解决方案,即发电厂高压开关装置与架空出线之间的连接。这种连接虽然比较短,但经常具有其他传输技术不能满足的特定要求,最严格的要求通常是传输电流达到4000A,而采用架空线路几乎是不可能实现的。GIL还广泛用于跨国界输电和可再生能源电力的向外输送,是一种经过实践验证的、经济、可靠的解决方案。

In large or Mega Cities the power ratings are constantly increasing, in some cases in the city centres by more ten 10% per year, and in the same time available space is constantly reduced. The reliability of the power supply of such Mega Cities is linked to the possibility of strong power transmission connections into the load centres. With the sizes of Mega Cities underground transmission length of 10, 20 or more kilometres are normal applications in the future. The gas insulated line （GIL） offers a solution for such requirements： high power ratings and underground transmission. This of course also qualifies GIL as a reliable technology for transmission purposes in power plants. There is a long record of such applications spread over the world since more than 30 years now. In particular GIL provides a technical solution for the ＂last mile＂, meaning the connection between the power plant high voltage switchgear and the outgoing overhead line. This comparatively short but required connection is frequently characterised by requirements, which any other transmission technology is unable to comply with. The most severe requirements are usually the transmission current up to 4000A and the fact that access for an overhead line is almost impossible. GIL provides an economic, reliable and proven solution for this problem.