Air-insulated substations up to 800 kV
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Air-insulated substations up to 800 kV As the demand for electrical power grows, power companies worldwide are active to ensure power is available wherever and whenever it is needed. Providing power to the customer has become an increasingly challenging task for system operators. Reliable power plants and a dependable transmission and distribution network are key factors for their success. Switchgear in transmission and distribution substations is not only used to control the power flow, but also to ensure that system failures and malfunctions remain limited to a defined area, which...

Engineered for all environmental conditions The design of an outdoor substation has to take into account not only the electrical parameters, but also the environmental conditions to which the substation is exposed. With Siemens as your partner, you can count on decades of experience in customized outdoor substations and thus leave the responsibility for such projects to us. Based on the customer’s specifications, our planning and design will make sure that the substation fits even the most challenging surroundings. Siemens’ services include selecting suitable high-voltage devices and design...

Design of air-insulated switchyards While stranded conductors are sufficient for currents up to a certain level, solutions with aluminum tubes are required for higher-rated currents and high short-circuit currents. Such conductors can carry rated currents of up to 8,000 A and short-circuit currents of up to 80 kA without difficulty. The switchyard design is not only influenced by the available space, but also by the location (e.g. living area, special environmental protection area) and the given infrastructure and accessibility. The coordinates of incoming and outgoing overhead lines and...

Single-line diagram H-configuration 110 kV Two lines are connected to two transformers and interlinked by a double bus sectionalizer. With this arrangement each of the feeders and devices of the switchyard can be maintained without an outage of the other feeders. The H-arrangement is mainly used for supplying power to industrial consumers as well as for distribution and transformer substations. With only one busbar and a minimum of equipment, it is an economical solution to serve your needs.

In-line longitudinal arrangement Kiellinie® with center-break disconnectors The busbar disconnectors are arranged one behind the other (in-line) and in parallel to the longitudinal axis of the busbar. It is possible to use either wire-type or tubular busbars. In case of tubular busbars, gantries are required only for the outgoing overhead lines. The system design requires only two conductor levels, which results in a very clear layout. Because of the disconnectors’ in-line arrangement, the bay is wide, but quite short.

The name of the arrangement is derived from the center tower between two busbar systems. The busbar disconnecting switches are arranged side by side and in parallel to the longitudinal axis of the feeder. Busbars are usually designed with stranded conductors. It is necessary to run the conductors over the circuit breakers, which results in a reduced bay width as compared to the in-line arrangement. The system layout is clearly structured and straightforward. A more complex double-busbar scheme provides higher flexibility and increased operational availability and reliability of the...

Diagonal layout with pantograph disconnectors The pantograph disconnectors are placed diagonally to the axis of the busbars and feeders, which results in a very clear arrangement with minimal space requirement as compared to other conventional AIS arrangements. Wire and tubular conductors are customary. The busbars can be placed above or below the feeder conductors. For important grid stations at transmission network nodes of higher voltage levels, the 3-busbar scheme can be used.

Breaker-and-a-half layout The breaker-and-a-half arrangement assures the highest degree of availability and reliability. As expressed in this layout’s name, this high degree is achieved with an extra half circuit breaker per outgoing feeder. Therefore, the expenditure for high-voltage devices is quite high. The busbar disconnectors are of the pantograph, rotary, or vertical-break type. Vertical-break disconnectors are preferred for the diameters. The extremely short connections between the high-voltage devices that help dealing with even very high short-circuit currents (even with multiple...

Space-saving solutions – AIS compact Wherever conventional substation design exceeds the limits of available space, or the extension of a fully developed substation is required, space-saving and powerful alternatives are needed. Apart from the complete encapsulated design (GIS), customers also rely on mixed-technology outdoor solutions and on space-saving AIS compact solutions. Especially regions where small-scale transformer substations prevail, where wind parks are to be connected to the network, or industrial plants benefit from Siemens’ AIS compact solutions

Upgrading to a state-of-the-art substation An increasing number of aging HV substations has to be refurbished to extend lifetime and performance. Siemens’ experience in the modernization of older installed substations is vast, regardless of whether they originated from Siemens or other manufacturers. Adapting the original installation to current network requirements and upgrading protection, control, and monitoring systems to the latest state of the art will enhance the overall reliability of your power supply system, resulting in reduced downtimes and increased network performance. It will...

Published by and copyright © 2017: Siemens AG Energy Management Division Freyeslebenstrasse 1 91058 Erlangen, Germany For more information, please contact our Customer Support Center. Phone: +49 180 524 70 00 Fax: +49 180 524 24 71 (Charges depending on provider) E-mail: support.energy@siemens.com Article No. EMTS-B10029-00-7600 Dispo 30003 fb 7356 WS 0917 Subject to changes and errors. The information given in this document only contains general descriptions and/or performance features which may not always specifically reflect those described, or which may undergo modification in the...