Transforming distance into daily life. Siemens Transformers.
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El www.siemens.com/energy/transformers Transforming distance into daily life. Siemens Transformers. HVDC transformers ensure efficient energy flow

Efficient energy transformation with HVDC Reliable electrical power supply is based upon highly developed power grids. That is why Siemens is right there wherever networks are being expand d, retrofitted, or e newly built. As a world-leading manu acturer, systems f integrator, and provider of complete solutions and services, Siemens enables power utilities to transport and distribute electricity reliably and economically from the power plant to the customer. Our comprehensive product range covers transformers for power stations, substations, and HVDC converter stations as well as...

Special demands on transformers HVDC transformers are subject to operating conditions that set them apart from conventional system or power transformers. These conditions include: combined voltage stresses with both AC and DC high harmonics content of the operating current DC premagnetization of the core. The valve windings which are connected to the rectifier and the converter circuit are subject to the combined load stress of AC and DC voltage. Added to this stress are transient voltages from outside caused by lightning strikes or switching operations. Special demands require special...

Everything starts with the core Tank – unconventional design HVDC transformers are normally single-phase trans ormers, f whereby the valve windings for the star and delta connection are configured either for one core with at least two main limbs or separately for two cores with at least one main limb, depending on the rated power and the system voltage. The unconventional tank design in HVDC transformers results from the following requirements: The valve-side bushings should extend into the valve chamber, nearly horizontally. The cooling system is usually mounted on the opposite side to...

Nelson River Virginia Smith Welsh Neptune Acaray Moyle Interconnector Cahora Bassa East-South Interconnector Ge-Nan Tian-Guang Three Gorges Gui-Guang Gui-Guang II Thailand–Malaysia Basslink Project references – in use around the world Tried, tested, and proven Wherever long cable connections, trans missions of very large volumes of energy over extremely long distances, or the coupling of networks of the same or different frequencies are needed, Siemens HVDC transformers and smoothng reactors deliver outstanding per or ance. i f m As a technology leader in HVDC, Siemens stands for...

1 Nelson River, Manitoba, Canada Introducing water-cooled thyristor valves A double-bipolar 500 kV HVDC landline link delivers up to 2,000 MW from the power plants on the Nelson River in the north of Manitoba to the load centers in the south of the province, about 1,000 kilometers away. Bipole 2 was the first HVDC system using highly efficient water cooling for the thyristor valves, a technology which in the meantime has become standard. Siemens supplied all thyristor modules and all four smoothing reactors, 0.65 H, 500 kV. 2 Virginia Smith, Nebraska, USA Linking the asynchronous US...

4 Neptune, USA HVDC via subsea cable The purpose of the 105 km 500 kV DC undersea and underground cable link is to transmit 660 MW of power from the Sayreville substation in New J ersey to Duffy Avenue substation on Long Island, thus providing LIPA (Long Island Power Authority) with access to the very competitive PJM Inter on c nection, a multi-state energy market on the east coast of the USA. Siemens supplied eight HVDC transformers, 245 MVA each, plus three units rated at 80 –115 MVA. 5 Acaray, Paraguay Enabling intelligent energy exchange In times of low output from its hydropower...

7 Cahora Bassa, Mozambique The most powerful HVDC system in Africa The Cahora Bassa project, which was originally commissioned in 1977, allows the landline transmission of 1,920 MW at 533 kV DC over a distance of 1,456 kilometers, from the Zambezi River in Mozambique to South Africa. Siemens delivered 38 transformers rated at 90.8 MVA as well as four smoothing reactors, 0.7 A, 500 kV. South Africa After civil warfare in the region in the 1980s, the most powerful HVDC system in Africa and the transformers were completely refurbished and updated by Siemens between 1995 and 1998. 8 East-South...

10 Tian-Guang, China 1,800 MW over about 1,000 kilometers The 1,800 MW 500 kV landline HVDC system which transmits energy from the Tianshengqiao hydropower plant to the Guangzhou region in the south of China employs water-cooled thyristor valves with the valve towers hanging from a special ceiling construction and active DC filters. Siemens supported this project with 14 HVDC transformers, 354 MVA. Guangzhou Hong Kong 11 Three Gorges, China Crossing inhospitable terrain Transmitting energy over a long distance through nearly unaccessible terrain is a classic challenge in power transmission,...

13 Gui-Guang II, China Expanding a successful system In 2007, the Gui-Guang landline HVDC system, which transmits 3,000 MW of energy from the Anshun substation in southwest China across a distance of 980 kilometers to the Zhaoqing converter station near Guangzhou, was further expanded. Guangzhou Hong Kong Siemens delivered a further six HVDC transformers at 297 MW, six HVDC transformers at 278 MW, and two smoothing reactors, 0.27 H, 500 kV DC, 1,500 MVA. 14 Thailand–Malaysia Linking Asian networks together The 110 kilometers HVDC long-distance transmission system interconnects the 230 kV AC...

Published by and copyright © 2012: Siemens AG Energy Sector 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 Power Transmission Division Transformers Order No. E50001-G640-A101-V3-7600 Printed in Germany Dispo 19200 c4bs No. 7482 fb 4701 BR 472806 WS 02121.0 Printed on elementary chlorine-free bleached paper. All rights reserved. Trademarks mentioned in this document are the property of Siemens AG, its affiliates, or...