Gas Insulated Transmission Lines (GIL) by Hermann Koch

By Hermann Koch

Gas-insulated transmission strains (GIL) is a longtime excessive voltage expertise used whilst environmental or structural issues limit using overhead transmission traces. With an summary at the technical, not pricey and environmental impression and gear approach implications of GIL, this advisor presents an entire knowing of its actual layout, positive aspects and merits. the writer illustrates the way to evaluation while GIL could be the top answer through the making plans series and the way to use GIL within the electrical energy strength network.Other key good points include:operation and upkeep specifications with details on fix procedures, period, and varied tracking platforms permitting the fulfillment of trustworthy and secure operation;a wide selection of learned purposes from internationally over the last 35 years, illustrating average fields of program via descriptions of actual initiatives that the writer has labored on; andfuture program chances in a wise transmission community, used for fixing energy transmission problems.This is an important reference for engineers considering making plans and executing bulk strength transmission tasks overground, in tunnels or buried. It bargains a concise precis of all parts of the topic and is the fitting relief for application energy engineers, consulting engineers and brands all over the world.

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11 the principle set-up of the Schluchsee hydropower plant is shown. In each cavern a 420 kV high-voltage machine transformer (1) is located with a power capacity of 600 MVA. This machine transformer connects the power generator with the GIL. 11 Principle set-up of the Schluchsee GIL. 12 View into the tunnel. , because of lightning strokes). Between the vertical sections of the two GIL systems (1a) when leaving the cavern to the GIL systems (1b) in the tunnel a disconnecting switch is located to be able to separate the overhead line (6) side from the generator sides at the transformers (1).

The high-power transmission capability of 1800 MVA makes the GIL a powerful technical solution. The expected operation time is 2012. More technical design information is given in Chapter 4. 3 World-Wide Experiences SF6 has a three times higher electrical insulation capability than air when the same gas pressure is applied. 22 Cross-section of the trench with two GIL systems. 23 Trench with six pipes of GIL before backfill. Reproduced by permission of © Siemens AG and © Amprion GmbH and the ability to attach and fix free electrons, SF6 can be used for the design of high-voltage equipment.

The N2 content is between 80% and 98% and, respectively, the SF6 content is between 2% and 20% depending on pressure and dimensions. The three-phase and single-phase solutions have been investigated in detail to cover all aspects of manufacturing, laying process, on-site testing, operation, maintenance and repair. Three sets of prototypes have been produced by the designer to carry out all kinds of electrical, mechanical and thermal design tests. The result was that, from a technical point of view, three-phase and single-phase GILs are both possible.

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