{
  "language": "en",
  "interfaceLanguage": "ar",
  "url": "https://voltformer.com/ar/news/suedlink-suedostlink-dual-corridor-525kv-converter-transformers-isar-wolmirstedt-2026",
  "slug": "suedlink-suedostlink-dual-corridor-525kv-converter-transformers-isar-wolmirstedt-2026",
  "category": "transformers-grid",
  "publishDate": "2026-09-27",
  "sourceName": "50Hertz, TenneT TSO & TransnetBW",
  "sourceUrl": "https://www.50hertz.com/de/News/Detail/suedostlink-525kv-stromrichtertransformatoren-anlieferung-isar-wolmirstedt",
  "readingTimeMinutes": 5,
  "tags": [
    "SuedLink",
    "SuedOstLink",
    "525 kV DC",
    "Converter Transformers",
    "50Hertz",
    "TenneT",
    "TransnetBW",
    "German Grid",
    "HVDC Backbone",
    "Germany"
  ],
  "content": {
    "title": "German TSOs Receive First 525 kV HVDC Converter Transformers at SuedOstLink and SuedLink Terminal Hubs",
    "summary": "German transmission system operators 50Hertz, TenneT, and TransnetBW have received the first consignment of single-phase 525 kV DC converter transformers at the Wolmirstedt and Isar converter stations, marking a major milestone for the SuedOstLink and SuedLink HVDC corridors that will transfer 4 GW of northern wind power to Bavaria and Baden-Württemberg.",
    "sections": [
      {
        "heading": "Heavy-Haul Logistics Across Germany’s Inland Waterways",
        "paragraphs": [
          "Weighing over 340 metric tons each during transport, the 525 kV converter transformers were transported via inland barges along the Elbe and Danube rivers, followed by specialized 24-axle self-propelled modular transporters (SPMT) over reinforced heavy-haul road corridors.",
          "At Wolmirstedt (Saxony-Anhalt) and the Isar substation site (Bavaria), the units were skidded into dedicated fireproof acoustic blast bays equipped with automatic deluging and synthetic ester retention basins."
        ]
      },
      {
        "heading": "Engineered for ±525 kV Modular Multilevel Converters",
        "paragraphs": [
          "Manufactured by Siemens Energy and Hitachi Energy, these converter transformers bridge the 400 kV AC grid and the ±525 kV DC valve halls. They feature high-dielectric pressboard insulation barriers and electrostatic shields capable of enduring combined continuous DC stress and AC switching harmonics.",
          "Vacuum on-load tap changers (OLTC) with digital motor drives enable rapid voltage adaptation across 35 tap positions, ensuring seamless regulation under volatile renewable generation profiles."
        ]
      },
      {
        "heading": "Completing the Backbone of Germany’s Energiewende",
        "paragraphs": [
          "Together, SuedLink (Brunsbüttel to Leingarten/Großgartach) and SuedOstLink (Wolmirstedt to Isar) will provide 4 GW of controllable bidirectional transmission capacity, drastically cutting redispatch and curtailment payments.",
          "Following high-voltage oil impregnation and nitrogen dry-out verification, site acceptance testing (SAT) will proceed through early 2027 ahead of trial system commissioning."
        ]
      }
    ]
  },
  "companies": []
}