By Hermann Koch
Gas-insulated transmission strains (GIL) is a longtime excessive voltage know-how used whilst environmental or structural concerns limit using overhead transmission strains. With an summary at the technical, least expensive and environmental impression and gear process implications of GIL, this advisor offers a whole figuring out of its actual layout, positive aspects and benefits. the writer illustrates the best way to assessment whilst GIL could be the top answer through the making plans series and the way to use GIL within the electrical energy energy network.Other key gains include:operation and upkeep standards with details on fix approaches, length, and diverse tracking structures allowing the success of trustworthy and secure operation;a good selection of learned functions from internationally over the last 35 years, illustrating general fields of software via descriptions of genuine initiatives that the writer has labored on; andfuture program probabilities in a wise transmission community, used for fixing strength transmission problems.This is an important reference for engineers considering making plans and executing bulk energy transmission initiatives overground, in tunnels or buried. It bargains a concise precis of all parts of the topic and is the appropriate reduction for application energy engineers, consulting engineers and brands around the globe.
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Additional resources for Gas Insulated Transmission Lines (GIL)
Sample text
R The on-site assembly with high-voltage cleanliness (insulators, gas compartments) has shown that the conditions for high-voltage GIL can be met successfully. The automated welding process produces high-quality welds with high repetition rates. From the total of 300 orbital welds, less than 10 needed manual rework after 100% ultrasonic testing of each weld. r The second-generation, gas-mixture GIL proved to be reliable and went into service after the high-voltage tests without any failure. r The elastic bending down to 700 m bending radius allowed adaptation to the tunnel bending without the need for angle modules.
80% N2 /20% SF6 angle modules (7). In the middle of the tunnel the GIL is fixed by a steel structure to the tunnel walls (6) and in the tunnel run held by steel structures with sliding supports (5). During erection, access was given through the installing opening (1); this was closed after erection was complete [43, 44, 61]. 14 a view into the tunnel is shown. 6 m width. The pipes are held by steel structures at distances of 28 m and can slide when thermal expansion occurs. The single spiral-welded pipe has a length of 14 m.
In feasibility studies, the design of a future GIL was explained. 8. The key technical data required a high-power, underground transmission system to solve network links of up to 100 km. The requirement of 3000–4000 MW power transmission is the limit for network stability reasons. Three GIL design teams (ABB, Alstom and Siemens) came up with two basic solutions: one three-phase insulated design and two single-phase insulated designs [38–41]. The three-phase insulated design had three aluminium conductors in one enclosure of steel with an aluminium inlay.