Dehler
Dehler
Pre-engineered, modular substation platforms and high-voltage outdoor vacuum circuit breakers designed for harsh maritime environments.
As a Small Island Developing State (SIDS) located in the Gulf of Guinea, São Tomé and Príncipe (STP) faces unique and pressing challenges in energy security, grid infrastructure modernization, and decarbonization. Historically dependent on imported diesel for power generation, the nation is actively transitioning to utility-scale solar photovoltaic (PV) integrations and hydro-power rehabilitation.
However, integrating volatile renewable sources into an isolated, fragile microgrid requires highly resilient, smart power distribution technologies. The conventional brick-and-mortar substation model is no longer viable for STP due to prolonged civil engineering lead times, scarce local specialized labor, and aggressive tropical coastal corrosion.
This is where prefabricated substations (modular e-houses / package substations) emerge as a vital technology. By shifting up to 90% of assembly, wiring, and testing from the field to a controlled factory setting, utilities like EMAE (Empresa de Água e Electricidade) and private industrial operators can deploy fully operational, type-tested power nodes in a fraction of the time.
Corrosion Protection Standard
kV Substation Output Range
Faster Project Commissioning
Enclosure Protection Levels
The expansion of agriculture processing (cocoa export facilities), port expansions (Port of São Tomé and deep-water developments), and luxury eco-tourism resorts across both São Tomé and Príncipe islands requires decentralized energy networks. A localized prefabricated substation acts as the heart of these microgrids, bridging high-voltage transmission lines (up to 33kV/40.5kV) down to usable low-voltage distributions (400V/230V).
Furthermore, the introduction of reactive power compensation technology is critical to maintain power quality. Weak grids are susceptible to voltage drops and reactive losses. Utilizing Dehler's intelligent Reactive Power Compensation Controllers within these compact substation setups ensures automated power factor correction, lowering thermal stress on local transformers and eliminating penalty charges from energy suppliers.
By implementing ring main unit architectures (RMUs) inside modular enclosures, commercial grids can run loop configurations. In the event of a localized line failure (common during the tropical rainy seasons), the switchgear automatically isolates the fault and routes power from alternate nodes, minimizing downtime for vital fish processing, agricultural, and hospital grids.
Dehler substations are structurally optimized for constant high temperatures, salt spray, and seismic dynamics.
Hot-dip galvanized structural bases combined with marine-grade exterior coating systems prevent rust build-up caused by constant oceanic winds.
Distinctly separated physical compartments for High Voltage Switchgear, Distribution Transformer, and Low Voltage Switchgear to guarantee operational safety.
Equipped with thermal-regulated dynamic intake/exhaust fans and double-walled insulated ceiling panels to maintain internal temperature equilibrium.
Compliant with international standards IEC 62271-202 for High-voltage/Low-voltage prefabricated stations.
| Specification Parameter | High-Voltage Side Range | Low-Voltage Side Range | Environmental Rating |
|---|---|---|---|
| Rated Operating Voltage | 12 kV to 40.5 kV | 230 V to 690 V | Maximum ambient +50°C |
| Short-circuit Current Limit | 20 kA to 31.5 kA (1s / 3s) | 50 kA to 80 kA (1s) | Relative humidity: up to 95% |
| Enclosure Protection Class | IP54 / IP65 (Optional) | IP4X / IP54 | IK10 high impact resilience |
| Transformer Capacities | Up to 2500 kVA (Dry-type / Oil-immersed) | Integrated bus-duct systems | C5-M (Marine coastal compliant) |
| Main Switching Interrupters | SF6 Ring Main Units or Eco-Gas RMU | ACB / MCCB withdrawable units | Seismic resistance: Zone 4 |
Dehler Technology Co., Ltd., established in 2016, is currently located at No. 271, Weishiqi Road, Yanpan Economic Development Zone, Yueqing City. And also have an electrical complete equipment transformer division located at No. 178, Jingba Road, Economic Development Zone. Dehler Technology Co., Ltd. is a technology enterprise integrating R&D, production, sales, and service, specializing in the high and low voltage power equipment industry.
We specialize in the production of high & low voltage switchgear, Prefabricated substations, cable branch cabinets, indoor & outdoor vacuum circuit breakers, disconnectors, earthing switches, load switches, and various electrical components.
We have established an efficient and comprehensive marketing network and after-sales service system. Our business covers key sectors such as power generation, railway electrification, steel mills, coal mining, cement, communications, shipbuilding, petroleum, wind power generation, electrical automation, harmonic control, high and low voltage capacitor switches, and supporting equipment. Our products meet the diverse needs of power systems with precise, reliable, energy-saving, and environmentally friendly intelligent power distribution products.
Complete product range for primary isolation, backup protection, power factor optimization, and automated transitions.
Strategic logistics coordination and pre-shipment quality standards to guarantee smooth transition on-site.
Delivering critical energy hardware to island ecosystems requires rigorous planning. Dehler designs all prefabricated substations with standard ISO footprint formats. This means the outer e-houses can be loaded directly onto container vessels, shipped from global marine logistics hubs, and unloaded easily at the Port of São Tomé without requiring specialized, hyper-heavy crane platforms.
Before shipment, all units undergo comprehensive Factory Acceptance Testing (FAT) at our production divisions located at Yanpan Economic Development Zone and Jingba Road. FAT protocols cover electrical insulation margins, mechanical interlocking mechanisms, IP moisture prevention validation, and full switchboard sequence mock-tests. Once delivered, the installation process on-site only involves anchoring the structure onto concrete pad foundations, sliding in the transformers, and connecting primary incoming and outgoing cables.
Our tech engineers provide digital commissioning support and detailed wiring roadmaps. By utilizing our customized high-voltage component systems (like Plum Blossom Contacts and Stationary Contacts), you ensure that high-frequency switches run without electrical resistance buildup, drastically reducing the necessity of local regular site maintenance.
Consistently expanding sales networks and supporting major industrial developers worldwide.
Detailed technical advice regarding project deployment, solar microgrid adaptation, and high-voltage operations.
They significantly cut down construction timelines and minimize the reliance on scarce local technical labor. By completing up to 90% of assembly and validation at our factory, units are simply shipped, positioned, and turned on safely, minimizing risks in volatile maritime climates.
We supply enclosures designed up to C5-M ratings (applicable for coastal areas with high salinity). All structural framing undergoes hot-dip galvanization and receives protective paint coats to resist oxidation and structural damage.
They house low-voltage control setups, DC combiner blocks, and step-up transformers (such as moving from 0.4kV up to 11kV or 33kV levels). They also interface seamlessly with storage facilities and local grid protection schemes.
Yes. By utilizing integrated indoor electromagnetic locks, dry-type cast resin transformers, and high-voltage circuit breakers (like the ZW32 vacuum series), we eliminate condensation problems. Thermal ventilation fans kick in automatically based on internal temperatures.
We integrate reliable options like the KYN61-40.5 armored removable switchgear or compact SF6 insulated ring main units (RMU), such as the XGN15-24. These provide safe loop network protection and quick overcurrent isolation.
We install DLQ5 dual power automatic transfer switches (ATS) within the low-voltage output control rooms. If primary grid power is lost, the ATS transitions critical local circuits to diesel backup generators or solar storage systems automatically.
Weak island grids suffer from fluctuating voltage and line losses. Integrating reactive power factor correction controllers stabilizes the grid voltage, improves transmission efficiency, and prevents grid equipment overload.
Substations are pre-assembled inside structural containers matching ISO shipping standard parameters. They can be shipped as general container cargo, easing logistics at local ports and simplifying road transport to installation sites.
Contact our senior electrical engineers to configure custom electrical parameter configurations, custom structural materials, and request comprehensive factory quotes.
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