DC compact switchgear (DC CS) for 320 kV siemens.com/energy The changing generation and load structure in existing power grids requires increased transmission capacity. ­Longer transmission distances and increased loading tend to reduce the AC grid’s static and dynamic stability. To amend this, HVDC systems can be integrated into ­existing AC grids to provide the required transmission ­capacity and at the same time increase grid stability. A new dimension in compactness •space-saving design What is more, the global trend towards decarbonization of power generation calls for an increased use of renewable energy sources (RES). While RES like offshore wind are typically found at great distances from the load centers, HVDC provides an effective (and in some cases the only) technical solution for power transmission. •reduction of DC switchyard in converter stations up to 95% The compact 320 kV DC switchgear DC CS is needed for HVDC cable connections to remote offshore wind farms as well as for onshore HVDC projects. Thanks to its com­ pact design, the DC CS helps to reduce the HVDC system’s space requirements. Hence it is predestinated for appli­ cations where space is limited or expensive, e.g. offshore HVDC platforms for remote windfarms as well as close to city centers. Using the DC CS outdoors even in rough climates adds to this effect. In the near future, DC com­ pact switchgear and transmission solutions facilitate the realization of multi-terminal arrangements or DC grids, backing up the existing AC networks. •safe encapsulation •suitable for onshore and offshore ­operation •reliable operation even under extreme environmental conditions •high degree of gas-tightness •high availability and reliability •low life cycle and maintenance costs Answers for energy. Technical Data Switchgear, general data Switchgear type Udc nominal voltage Umcov maximum continuous operation voltage Rated lightning impulse withstand voltage (1.2/50 μs) •to earth •across the isolating distance at the power frequency voltage Rated switching impulse withstand voltage (250/2500 μs): •to earth •across the isolating distance at the power frequency voltage Rated normal current Rated short-time withstand current, 1 second Ambient temperature range Leakage rate per year and gas compartment Disconnector Rated current Rated short-time withstand current, 1 second Type of motor-drive Closing time Opening time Earthing switch / High Speed Earthing Switch Rated short-time withstand current, 1 second Type of motor-drive Closing time Opening time DC CS 320 kV 320 kV 336 kV 1175 kV 1175 + 336 kV 950 kV 950 + 336 kV 4000 A 50 kA –30 to +50 °C ≤ 0.5 % routine test ≤ 0.1 % type test 4000 A 50 kA DC-motor ≤ 6 s ≤ 6 s 50 kA DC-motor ≤ 7 s / ≤ 100 ms ≤ 7 s / ≤ 100 ms Published by and copyright © 2014: Siemens AG Energy Sector Freyeslebenstrasse 1 91058 Erlangen, Germany Siemens AG Energy Sector Power Transmission Division Transformers Katzwanger Strasse 150 90461 Nuremberg, 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 Order No. E50001-G610-A134-X-4A00 Printed in Germany Dispo 30003 TH 150-140382 WÜ 473222 DB 07141.5 siemens.com/energy