Manufacture of metal-oxide surge arresters for medium, high and DC voltage up to 800 kV at the Hermsdorf site
Tridelta Meidensha GmbH
Hermsdorf (Thuringia)New on Amplifa
About Tridelta Meidensha
Tridelta Meidensha GmbH, headquartered in Hermsdorf (Thuringia), has been producing surge arresters since 1960 and has been wholly owned by Japan's Meidensha Corporation since 2015. The product portfolio includes metal-oxide surge arresters (MOSA) for system voltages from 1 to 800 kV: high-voltage arresters in porcelain and silicone housings (SBKC Cage Design, SBKT Tube Design), medium-voltage arresters up to 60 kV, DC arresters up to 4.8 kV for railway applications, and line arresters (NGLA). This is complemented by monitoring devices such as the DCC-series discharge counters and the intelligent monitoring device smartCOUNT, as well as custom arrester solutions from the company's own development department. The metal-oxide blocks (ZnO varistors), the core component, are manufactured at the R&D center of parent company Meidensha, which as a pioneer developed the world's first metal-oxide surge arrester in 1975. Type tests in accordance with IEC 60099-4 can be performed in the modern high-voltage laboratory in Hermsdorf. The arresters are in service in over 120 countries, including in substations, rail vehicles and overhead lines.
- Site
- Hermsdorf
- Processes
- Manufacture of metal-oxide surge arresters (MOSA) for high voltage up to 800 kV (SB porcelain,, Manufacture of medium-voltage arresters SBKW in silicone housing (glass-fiber cage,, Manufacture of DC arresters up to 4.8 kV DC (SB-B, SBKW DC-B/DC-C) with, Manufacture of line arresters (NGLA) based on SBKC silicone housing, Manufacture of monitoring devices (discharge counters DCC 2/DCC-ML 2, smartCOUNT,, Development of custom arrester solutions (special applications, e.g. support insulator function,, Type tests in accordance with IEC 60099-4 in the high-voltage laboratory (impulse voltage, AC, Production of metal-oxide blocks (varistors) for AC and DC applications by the parent company
- Materials
- Metal-oxide varistors (ZnO), LSR silicone (liquid silicone rubber, housing material), HTV silicone rubber (injection molding), glazed porcelain (hollow insulator), Glass-fiber reinforced epoxy resin rods / glass-fiber tube, Glass-fiber rods (cage), Metal-oxide varistors, LSR silicone (liquid silicone rubber)
- Certificates
- DIN EN ISO 9001, DIN EN ISO 14001, DIN EN ISO 45001, ISO 9001, ISO 14001, ISO 45001
- Founded
- 1960
- Industries
- Power engineering (power supply/substations), Rail transport (railway applications), Electrical industry
- 01
Varistor manufacturing (metal-oxide blocks, Meidensha R&D center)
- 02
Assembly of the active part (glass-fiber cage/filament cage)
- 03
Housing manufacture (LSR/HTV silicone injection molding or porcelain)
- 04
Type testing in the high-voltage laboratory
- 05
Sales and service via a worldwide agent network
Materials and Processes
Metal-oxide varistors
Core component of all arresters, manufactured by parent company Meidensha for AC and DC applications.
LSR silicone (liquid silicone rubber)
Housing material with lifelong water repellency, UV and aging resistance and excellent behavior under pollution.
HTV silicone rubber
Used in injection molding for DC arresters with filament cage technology.
Glazed porcelain
Hollow insulator of the proven SB design for high-voltage applications up to 800 kV.
Glass-fiber reinforced epoxy resin rods and glass-fiber tubes
Form the highly mechanically stable cage around the varistors in the patented cage or tube design.
Locations
Hermsdorf
DEHeadquarters and production site
- Materials
- Metal-oxide varistors, LSR/HTV silicone, porcelain, glass-fiber epoxy resin
- Impulse generator up to 1.2 MV
- AC voltage test transformer 600 kV
- Varistor test system IP 225/100
- High-current impulse generator 100 kA
- Long-wave generator (line discharge class 1–5)
- Test system for 5000-hour weather aging test
- Climatic chamber -40 °C to +100 °C
- Mechanical bending and tensile test system 30,000 N
Products and Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Manufacture of metal-oxide surge arresters (MOSA) for high voltage up to 800 kV (SB porcelain,Assembly | – | – | – | – | Metal-oxide varistors, Porcelain, LSR silicone, Glass-fiber epoxy resin |
| Manufacture of medium-voltage arresters SBKW in silicone housing (glass-fiber cage,Assembly | – | – | – | – | Metal-oxide varistors, Glass fiber, LSR silicone |
| Manufacture of DC arresters up to 4.8 kV DC (SB-B, SBKW DC-B/DC-C) withAssembly | – | – | – | – | Metal-oxide varistors, Glass fiber, HTV silicone rubber, Porcelain |
| Manufacture of line arresters (NGLA) based on SBKC silicone housingAssembly | – | – | – | – | Metal-oxide varistors, Glass fiber, LSR silicone |
| Manufacture of monitoring devices (discharge counters DCC 2/DCC-ML 2, smartCOUNT,Assembly | – | – | – | – | – |
| Development of custom arrester solutions (special applications, e.g. support insulator function,Engineering | – | – | – | – | – |
| Type tests in accordance with IEC 60099-4 in the high-voltage laboratory (impulse voltage, ACTesting | – | – | – | – | – |
| Production of metal-oxide blocks (varistors) for AC and DC applications by the parent companyCasting | – | – | – | – | Metal oxide (ZnO varistor ceramic) |
8 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Impulse generator (impulse voltage test) | – | – | up to 1.2 MV | – | Hermsdorf |
| AC voltage test transformer | – | – | 600 kV | – | Hermsdorf |
| Varistor test system | IP 225/100 | – | – | – | Hermsdorf |
| High-current impulse generator | – | – | 100 kA | – | Hermsdorf |
| Long-wave generator (line discharge class 1 to 5) | – | – | – | – | Hermsdorf |
| Weather aging test system | – | – | 5000 h | – | Hermsdorf |
| Climatic chamber | – | – | -40°C to +100°C | – | Hermsdorf |
| Mechanical bending and tensile test system | – | – | 30,000 N | – | Hermsdorf |
Additional services
Quality and Certification
Type tests in accordance with IEC 60099-4 are performed in the company's own high-voltage laboratory in Hermsdorf, including impulse voltage, AC voltage, varistor, high-current impulse, weather aging, climate and mechanical tests. The company is certified to DIN EN ISO 9001, 14001 and 45001; the entire development department is certified to ISO 9001.
| Evidence | Hermsdorf |
|---|---|
| ISO 9001 | |
| ISO 14001 | |
| ISO 45001 |
History
- 1922
Predecessor company HESCHO is formed from the merger of Margarethenhütte with the Kahla porcelain factory (porcelain insulators)
- 1960
Start of specialization in the production of surge arresters in Hermsdorf
- 1962
First medium-voltage arresters produced
- 1972
Meidensha begins developing metal-oxide blocks as a pioneer
- 1975
Meidensha develops the world's first metal-oxide surge arrester (MOSA)
- 1997
Production facility of Magnetfabrik Aplerbeck (Dortmund) acquired
- 2010
French arrester manufacturer acquired from Areva and later divested
- 2014
Tridelta Überspannungsableiter GmbH becomes a wholly owned part of Meidensha Corporation
- 2015
Sale of the arrester division to the Japanese Meiden Group; company renamed Tridelta Meidensha GmbH
- 2020
New arrester monitoring device smartCOUNT launched on the market
- 2024
Phase-out of indoor medium voltage