Switchgear construction, transformers and service for medium and low voltage – since 1970
Geier Starkstromtechnik GmbH
Dillenburg-Oberscheld (headquarters, workshop, transformer warehouse, laboratory)New on Amplifa
About us
Geier Starkstromtechnik GmbH is an ISO 9001:2015 certified specialist firm for high-current and energy technology based in Dillenburg-Oberscheld (Hesse). Founded in 1970 in Herborn, the company manufactures low-voltage main distribution boards, reactive power compensation systems (swivel frame technology) and switchgear combinations to DIN EN 61439 up to 4000 A in its own electrical workshop as an authorized STRIEBEL & JOHN system partner (ABB Group). Its range of services includes medium-voltage switchgear up to 36 kV, transformer substations, and the sale of new and factory-reconditioned oil and cast-resin transformers from 160 to 3.150 kVA ex stock. In addition, the company offers transformer service including insulating oil treatment, decontamination of PCB-containing transformers and electrical transformer testing, live-line work (AuS) up to 36 kV, grid and harmonic analyses, infrared thermography, and maintenance to DIN/VDE with a 24h emergency service. Over 40 employees serve industry, trade, energy suppliers and municipalities nationwide.
- Site
- Dillenburg-Oberscheld
- Processes
- Manufacture of low-voltage switchgear up to 4000 A, Airless moisture cleaning of cast-resin transformers, Live-line work (AuS) on high-current installations up to 36 kV, Transformer substations (planning, delivery, installation, commissioning, erection), Cable routing construction, cable laying, cable testing (insulation measurements), Grid/harmonic analysis, measurement & grid analysis (voltage quality, up to 50th order or higher), Taktfrequenzfilter TAGEDA (filter circuit for interference quantities between 1 kHz and 150 kHz), Infrared thermography on electrical installations
- Materials
- Oil/insulating oil (transformer capacitor oil, PCB-free), Cast resin (cast-resin transformers), SF6 (insulating gas for MV switchgear), STRIEBEL & JOHN system components (enclosure system technology), Cast resin, Insulating oil (PCB-free), SF6, STRIEBEL & JOHN system components
- Certificates
- DIN EN ISO 9001:2015, Specialist company under water law (§62 WHG / AwSV), CrefoZert (Creditreform creditworthiness certificate), System Partner Striebel & John (pro E power), Specialist company under § 62 WHG (Water Resources Act), CrefoZert (creditworthiness), STRIEBEL & JOHN system partner (pro E power)
- Founded
- 1970
- Employees
- 40
- Industries
- Industry, Trade, Energy suppliers, Municipalities, Crafts
- 01
Consulting & planning of electrical installations
- 02
Manufacture of switchgear and LV main distribution boards in own workshop
- 03
Delivery of transformers ex stock
- 04
Installation & cable routing construction
- 05
Testing (insulation measurement, transformer testing)
- 06
Commissioning
- 07
Maintenance, overhaul & 24h emergency service
Materials & Processes
Cast resin
Cast-resin transformers for low-maintenance applications, including airless moisture cleaning.
Insulating oil (PCB-free)
Transformer capacitor oil for oil transformers, including treatment, replacement and laboratory analysis.
SF6
Insulating gas for SF6 gas-insulated medium-voltage switchgear up to 36 kV.
STRIEBEL & JOHN system components
Enclosure system technology from the ABB Group for switchgear combinations to DIN EN 61439.
Locations
Dillenburg-Oberscheld
DEHeadquarters, electrical workshop/control cabinet construction, transformer warehouse, insulating oil laboratory
- Lot size
- Single-unit and project production, small series
- Materials
- Switchgear, oil and cast-resin transformers
- Electrical workshop/control cabinet construction with computer-aided planning and documentation
- Transformer warehouse (new and factory-reconditioned transformers)
- DC micro-ohmmeter for high-current winding testing
- Laboratory for transformer insulating oil analysis
- Cable pulling winch
- Special lifting frame for tank edge seal replacement
Services & Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Assembly | – | – | – | – | – |
| Assembly | – | – | – | – | STRIEBEL & JOHN system components (ABB Group) |
| Manufacture of low-voltage switchgear up to 4000 AAssembly | – | – | – | – | – |
| Assembly | – | – | – | – | – |
| Testing | – | – | – | – | – |
| Assembly | – | – | – | – | – |
| Assembly | – | – | – | – | – |
| Assembly | – | – | – | – | Oil transformers, Cast-resin transformers, Hermetic transformers, Oil-expansion tank transformers |
| Testing | – | – | – | – | – |
| Airless moisture cleaning of cast-resin transformersSurface | – | – | – | – | Cast-resin transformers |
| Live-line work (AuS) on high-current installations up to 36 kVAssembly | – | – | – | – | – |
| Transformer substations (planning, delivery, installation, commissioning, erection)Assembly | – | – | – | – | – |
| Cable routing construction, cable laying, cable testing (insulation measurements)Assembly | – | – | – | – | – |
| Grid/harmonic analysis, measurement & grid analysis (voltage quality, up to 50th order or higher)Testing | – | – | – | – | – |
| Taktfrequenzfilter TAGEDA (filter circuit for interference quantities between 1 kHz and 150 kHz)Assembly | – | – | – | – | – |
| Infrared thermography on electrical installationsTesting | – | – | – | – | – |
| Plant construction and electrical installation (power distribution, control technology, buildingAssembly | – | – | – | – | – |
| Assembly | – | – | – | – | – |
| Assembly | – | – | – | – | Oil transformers |
6 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| – | – | – | – | – | Dillenburg (Fritz-Heun-Weg 7) |
| Transformer warehouse (new and factory-reconditioned transformers ex stock) | – | – | Transformers 160 to 3150 kVA for 10 kV and 20 kV | – | Dillenburg (Fritz-Heun-Weg 7) |
| Cable pulling winch | – | – | – | – | – |
| DC micro-ohmmeter for high-current winding testing on transformers | – | – | – | – | Dillenburg / on-site at the customer |
| In-house laboratory for transformer insulating oil analysis | – | – | – | – | Dillenburg |
| Special lifting frame for tank edge seal replacement on transformers | – | – | – | – | – |
Additional services
Reference customers
Quality
Quality assurance to DIN EN ISO 9001:2015 (TÜV Hessen, Reg. No. 73 100 8324) with documented manufacturing and testing processes, tests to DIN EN 61439, DIN VDE 0100 and DGUV Regulation 3. Own test equipment such as DC micro-ohmmeters, insulation measurement technology and an in-house laboratory for transformer insulating oil analysis to DIN EN 60422.
| Evidence | Dillenburg-Oberscheld |
|---|---|
| DIN EN ISO 9001:2015 | |
| Specialist company under § 62 WHG (Water Resources Act) | |
| CrefoZert (creditworthiness) | |
| STRIEBEL & JOHN system partner (pro E power) |
History
- 1970
Founded in Herborn by Karl-Ludwig Geier
- 2013
Inauguration and relocation to Oberscheld (Dillenburg)
- 2014
New construction of a hall in Oberscheld, expansion of operating floor space
- 2014
Authorization as STRIEBEL & JOHN system partner for switchgear combinations up to 4.000 A to DIN EN 61439
- 2024
Company founder Karl-Ludwig Geier passes away on 13.05.2024 at the age of 80
- 2026
Re-certification to DIN EN ISO 9001:2015 by TÜV Hessen (05.03.2026–04.03.2029); CrefoZert from Creditreform for excellent creditworthiness