Rockwill 400 Units Prefabricated Substation Case Study in Niger

Riding the wave of electrification across West Africa, customized prefabricated substations are fully tailored to Niger’s extreme operating conditions of high heat, aridity and frequent sandstorms. Leveraging integrated and modular advantages, they effectively shore up urban and rural power supply weaknesses and solidify the foundation of national power grid modernization.

01 Project Overview 1.1 Project Background

Niger, a significant French-speaking nation in the Sahel region of West Africa, has been aggressively advancing rural power grid upgrades and universal electrification initiatives in recent years. With rapid growth in urban industrial and commercial loads and continuous expansion of rural grid coverage, legacy distribution facilities faced challenges such as insufficient supply capacity, aging equipment, and low reliability. These issues struggled to meet local production and domestic electricity demands. Furthermore, the harsh environmental conditions of high temperatures, drought, and heavy dust in Niger placed higher demands on the environmental adaptability of power distribution equipment.

To support the upgrade of the Niger national grid and ensure stable and reliable power supply for both urban and rural areas, Rockwill provided a batch of 400 prefabricated substations for Niger. Leveraging mature product design, rigorous quality control, and a comprehensive overseas service system, Rockwill delivered safe, efficient, and highly adaptable power distribution solutions. These solutions effectively enhanced grid supply capacity and operational stability, driving the high-quality development of Niger's power infrastructure.

1.2 Core Product and Parameters

A total of 400 units of prefabricated substations, along with associated accessories and spare parts, were configured for this project. The core parameters are as follows:

Item

Technical Details

Product Name

Prefabricated Substation (Package Substation)

Rated System Voltage

20 kV / 0.4 kV

Rated Frequency

50 Hz

Rated Capacity

250 kVA ~ 1600 kVA

Degree of Protection

IP54

Applicable Standards

IEC 62271-202

Supply Quantity

400 Units

Installation Location

Urban and Rural Distribution Networks in Niger

Commissioning Year

2024

2.1 Manufacturing and Quality Assurance

Rockwill prefabricated substations utilize an integrated modular design, specifically optimized for the high-temperature, arid, and dusty environments of Niger. Key advantages include:

• Compact Integrated Design: High-voltage units, transformer units, and low-voltage units are rationally arranged in an integrated layout. The compact structure and small footprint enable quick on-site installation, significantly shortening grid construction cycles to meet local rapid networking needs.

• Enhanced Corrosion and Dust Resistance: The enclosure features a high-strength structural design with professional anti-corrosion, sun-proof, and dust-proof spray coatings. It offers excellent rain-proof, dust-proof, and UV-resistant performance, ensuring long-term stable operation in harsh outdoor environments.

• High-Efficiency Cooling System: Transformers are strictly designed according to IEC 60076 standards, utilizing high-efficiency, low-loss cores and windings combined with an optimized cooling structure. High heat dissipation efficiency and excellent temperature rise control allow for continuous full-load operation under high-temperature conditions.
• Localized Adaptation: The overall solution balances safety, reliability, and ease of maintenance. Cabinet labels and operation panels are provided in French, fully adapting to the usage habits of French-speaking regions and meeting the practical needs of rapid construction and simple maintenance for the local grid.

2.2 Quality Certification

Rockwill is certified under ISO 9001, ISO 14001, and ISO 45001. All products have passed authoritative tests by national electrical equipment quality supervision and inspection centers, complying with IEC international standards and relevant industry specifications.

03 Factory Acceptance Testing (FAT)

All 400 units underwent comprehensive factory acceptance tests in accordance with IEC and industrial standards:

• Dielectric Withstand Test: Power frequency and lightning impulse withstand tests were completed per standards with no breakdown or flashover, verifying insulation performance.
• Temperature Rise and Load Test: Simulated full-load operating conditions to test temperature rise and loss indicators, ensuring long-term reliability.
• Degree of Protection Test: Successfully passed the IP54 dust-proof and water-proof test for harsh outdoor environments.
• Protection Function Test: Simulated over-voltage, under-voltage, over-current, and short-circuit faults verified rapid and accurate protection responses.
• Environmental Adaptation Test: Simulated high-temperature, dry, and heavy dust environments to verify long-term operational stability.

04 Packaging and Shipping

To address the large cabinet structure of prefabricated substations and the transportation requirements of the Niger project, Rockwill adopts a heavy-duty customized protective packaging solution exclusively for export, ensuring the safety of equipment throughout the entire transportation process:

• The cabinet is protected by high-strength integral packaging. Key electrical components, secondary circuits and other core elements are individually sealed for moisture protection, with desiccants and moisture-proof films installed inside, effectively resisting moisture and sand erosion during sea freight and inland transportation in Africa.
• The exterior of the cabinet is equipped with a customized reinforced protective structure, and professional cushioning, shock-absorbing materials and limit fixing devices are installed inside, comprehensively withstanding the jolts and impacts of long-distance sea and land transportation, and preventing structural deformation and component damage during transit.
• Supporting accessories, spare parts and technical documents are packed separately in categories, with French-language markings uniformly applied to all shipments, ensuring efficient and convenient on-site acceptance.
• Shipments are made in batches strictly in accordance with the construction schedule of the Niger power grid project, with full logistics tracking throughout the process, ensuring all equipment arrives at the project site intact and on time, and guaranteeing the smooth progress of the project as scheduled.

05 Installation and Operation Summary 5.1 Installation Implementation

Rockwill dispatched a professional technical team to Niger to provide comprehensive installation and commissioning services, ensuring standardized installation and successful acceptance:

• Guided the construction of equipment foundations and earthing systems (ensuring resistance < 4 Ω).
• Supervised the lifting, positioning, and securing of the units, precisely adjusting leveling for outdoor operation.
• Completed high-voltage and low-voltage cable terminations, insulation testing, and grounding reliability checks.
• Conducted on-site commissioning, precisely set protection parameters, and verified all functions met grid requirements.
• Coordinated with the Niger National Electricity Company (NIGELEC) for on-site acceptance testing (SAT), ensuring all units passed successfully.
• Provided operation and maintenance training for local personnel and delivered French technical dossiers and Operation and Maintenance manuals.

5.2 Operation Feedback

Since commissioning, the 400 prefabricated substations have operated stably without major failure or shutdown. The project has significantly improved power supply capacity and reliability in Niger, enhanced voltage quality, and reduced line losses, receiving high praise from NIGELEC and local users.

Local Utility Testimonial: "Rockwill prefabricated substations are stable and highly adaptable to Niger's actual conditions. Their professional and efficient technical service has provided strong support for our grid upgrade and livelihood power security."

06 Full Lifecycle O&M Managed Services

Rockwill provides a dedicated lifecycle management framework for the 400-unit project in Niger, covering selection, installation, monitoring, regular inspection, maintenance, fault response, and decommissioning. Our specialized approach ensures long-term safety, extends equipment life, and reduces overall O&M costs for the Niger distribution network.

Contact us for more details and customized power solutions for the African market!