Energy distribution & transmission
We support you in the planning, development and production of your projects.
The Energy Transmission & Distribution division includes in particular air & gas-insulated switchgear (substations), converter stations for traction power systems, so-called FACTS systems (Flexible Alternating Current Transmission Systems) for reactive/active power control, systems for high-voltage direct current transmission (HVDC for short) and high-voltage cable systems. Our activities range from planning and construction to commissioning and service. We thus offer you complete, high-quality services from a single source. We are in the excellent position of being able to draw on a wealth of experience, which is represented by numerous successfully completed projects around the globe.
AIS - Outdoor switchgear
GIS - Gas-insulated switchgear
Converter plants for DB AG
FACTS - Reactive/active power control systems
HVDC - High-voltage direct current transmission
HKM - High-voltage cable assembly
Special equipment
AIS - Outdoor switchgear
Scope of services:
Primary and secondary technology, assembly and commissioning
- Pipe busbar assembly and field stranding
- Construction of portals and overvoltage systems
- Assembly and adjustment of HV components
- Connection of transformers and QRTs (cross-regulating transformers)
- Installation and commissioning as well as support during commissioning
- Earthing measurement in cooperation with partner companies
- Protection/control technology
Voltage level:
110 - 380 kV up to 4-fold busbar
Project types:
- New "greenfield" building
- New replacement buildings
- Extensions
- Conversion of e.g. protection and control technology
Customers/end customers:
- SIEMENS, General Electric, Hitachi, ...
- TSO: 50Hz, TransnetBW, Amprion, TenneT, StatNet (Norway), ...
- DSO: SNH,
Experience & Key facts:
Over 1,000 switch panels in more than 100 substations
GIS - Gas-insulated switchgear
Scope of services:
Primary and secondary technology for onshore and offshore substations
- Installation and commissioning
- Earthing measurement in cooperation with partner companies
- SF6 handling with certified employees
- Design of high-voltage test equipment
- Protection/control technology
Voltage level:
110 - 380 kV with SF6 (sulphur hexafluoride) and CleanAir
Cable dimensioning:
System types:
e.g. 8DQ, 8DN, 8VN / ELK-3 420
Customers/end customers:
- SIEMENS, General Electric, Hitachi, Linxon
- TSO -> 50Hz, TransnetBW, Amprion, TenneT, ...
- DSO -> SNH, SW Munich, SW Stuttgart
Experience & Key facts:
Over 600 switch panels in more than 150 substations
Converter plants for DB AG
Scope of services:
Primary and secondary technology for onshore and offshore substations
- Installation and commissioning
- Installation of frequency inverter modules
- Earthing measurement in cooperation with partner companies
Voltage level:
Up to 110 kV
Customers/end customers:
- SIEMENS, Hitachi
Experience & Key facts:
Currently 4 systems and more in planning
FACTS - Blind/
Active power control systems
Scope of services:
Primary and secondary technology
- Construction of capacitor assemblies, power transformers, generator circuit breakers and switching elements
- Protection/control technology
Voltage level:
Up to 380 kV
Project types:
New construction and expansions in existing plants as part of the energy transition
Cable dimensioning:
System types:
Statcom (with and without battery storage or supercapacitor), SVC, MSCDN, SynCon (rotating phase shifter)
Customers/end customers:
- SIEMENS, General Electric, Hitachi
- TSO -> 50 Hz, TransnetBW, Amprion, TenneT
Experience & Key facts:
Over 20 projects already completed
HVDC - High-voltage direct current transmission
Scope of services:
Electromechanical installation of the complete converter technology for land and sea stations (offshore converter platforms)
- Protection/control technology
- Converter cooling
- Converter assemblies
- Transformer assemblies
- Monday HV equipment
- Pipe busbar assembly and field stranding
Voltage level:
up to 525kV +/- DC, 380kV AC
Project types:
Interconnectors, wind farm connections, corridor projects
System types:
Monopoles, bipoles, HVDC short coupling (BTB)
Customers/end customers:
- SIEMENS, General Electric, Hitachi
- 50Hz, TransnetBW, Amprion, TenneT (DE/NL), RTE, Energinet.dk, ELIA
Experience & Key facts:
- SEAR GmbH is a leading installation service provider in the HVDC sector
- > 20,000 MW installed transmission capacity
- > 700,000 man-hours of work
- > 10 years of experience in HVDC technology
- Number of projects 23 converter stations (of which 6 offshore and 17 onshore stations)
HKM - High-voltage cable installations
Scope of services
Medium and high-voltage cable installations
- Delivery and laying of construction cables (BEK) and high-voltage cables (62-400 kV, cross-sections up to 1 x 2,500 mm²)
- High-voltage terminations up to 245kV incl. pylon installations NKT, Brugg, Tyco, Pfisterer
- Cable sheath testing
- High-voltage testing and PD measurement in cooperation with partner companies
- Erection of overhead lines from pole installation to bird protection measures
- Upgrading and oil filling of 1-phase and 3-phase large transformers up to 695 MVA with corresponding WHG certification
- Overhead line systems and portal overvoltages up to 400 kV, conductor cable and pylon replacements (conductor cables up to AL/St 1055/45 mm²)
Special equipment
Upgrading and oil filling of large transformers
- Vacuum oil treatment system max. 6,000 l/h (EOK6000 for mineral oil)
- Auxiliary heating oil treatment
- System for the flexible production of dried breathing air (no dry air cylinders required)
- Breakdown voltage tester and various accessories
Medium and high-voltage cable installation/ overhead lines and portal overvoltages
- Truck with Palfinger crane superstructure (6 t) and alternative work basket (max. working height 23 m)
- Bagela BTT300 10 V cable trailer (capacity 29.9 t)
- Bagela cable pushers up to 800 Nm
- ZECK 7.5 t cable pulling winch, Vetter capstan winch (1 t)
- Installation material (cable reels, etc.) for approx. 1,500 m of cable route
- HIVOTEC CP 90 and 130 peeling devices, pull-on tools, cable heating sleeves
- Medium-voltage tester (VLF) SebaKMT CR-60
- Various test adapters and dummy caps
English 
Deutsch 
Polski