As a core country in global phosphate reserves and production, Morocco adopts 132kV high-voltage power transmission and 6kV medium-voltage power distribution as the backbone power supply framework for mining areas. The 3MVA-132/6kV mining main transformer is the core power supply equipment for open-pit/underground mining, crushing and screening, mineral processing, and mining area substations. In response to the extreme working conditions of Moroccan phosphate mines, such as high-temperature desert, severe dust, phosphate dust corrosion, heavy-duty impact, and continuous production, HENGFENGSHUAI ELECTRIC provides a full-process integrated solution covering customized design, intelligent manufacturing, factory testing, cross-border delivery, installation and commissioning, and operation and maintenance support. The solution is developed in strict compliance with ONEE power grid standards, IEC/ANSI specifications, and mining safety requirements, ensuring continuous and stable power supply for mining areas, reducing downtime losses, and improving mine power safety and energy efficiency.

1. Project Overview and Core Technical Parameters
This solution is customized for the whole-process power consumption of Moroccan phosphate mining, mineral processing, and transportation. It adopts a mining-reinforced oil-immersed structure, suitable for open-pit/underground, high-temperature, high-dust, phosphorus chemical corrosion, and strong vibration environments in mining areas. It meets the dual requirements of 132kV high-voltage grid connection and 6kV medium-voltage power distribution, stably supporting heavy-duty impact loads such as crushers, ball mills, conveyor belts, fans, and water pumps, and guaranteeing 24-hour continuous production of mines.

2. Customized Design and Development Exclusive for Phosphate Mines
2.1 Electromagnetic Adaptation Design for Mining Conditions
Professional simulation optimizes no-load loss, load loss, temperature rise, and short-circuit impedance, with full-load efficiency ≥98.5%, reducing mining area power consumption costs.
Adopts 0.27mm high-permeability oriented silicon steel sheet, featuring low loss and low noise, meeting noise reduction and energy-saving requirements of mining areas.
Strengthened anti-short-circuit, anti-harmonic, and anti-voltage fluctuation design to cope with strong impact loads and harmonic interference from crushers, ball mills, etc.
Optimized 6kV low-voltage output structure, supporting multi-loop power distribution and simultaneous power consumption of multiple sections, adapting to the decentralized load characteristics of mining areas.
2.2 Structural and Protection Reinforcement for Mining Environment (Exclusive for Phosphate Mines)
Iron Core: Step-lapped and vacuum-impregnated to reduce magnetic resistance and prevent dust intrusion.
Winding: Interleaved continuous winding with multi-layer strong insulation, resistant to lightning impulse, short-circuit impact, and mine vibration.
Oil Tank and Shell: C5-M heavy anti-corrosion grade, treated with sandblasting and multiple anti-corrosion coatings, passing salt spray and phosphate dust corrosion tests, ensuring no rust or corrosion in mining areas for a long time.
Sealing and Insulation: Fully sealed structure with weather-resistant, temperature-resistant, and oil-resistant materials, preventing phosphate dust, water vapor, and chemical media from intrusion.
Anti-seismic and Loosening-proof: Fastened body and anti-loosening structure, adapting to transportation and operation vibration of mining equipment.
2.3 Mining Compliance and Design Review
Tripartite review of technology, process, and quality, focusing on verification of:
Compliance of electromagnetic performance, temperature rise, loss, and insulation.
Satisfaction of anti-corrosion, dustproof, anti-seismic, and heat dissipation with extreme working conditions of phosphate mines.
Conformity with ONEE, IEC, ANSI, and mining safety access, ensuring one-time clearance, grid connection, and mining acceptance.
3. Intelligent Manufacturing and Mining Quality Process Control
3.1 Full Re-inspection of Core Materials (High Mining Standards)
Silicon Steel Sheet: Full inspection of magnetic performance, thickness, and temperature resistance to ensure low loss.
Copper Conductor: T1 oxygen-free copper, meeting resistivity, strength, and ductility standards to reduce load loss.
Insulation Materials: Weather-resistant, temperature-resistant, oil-resistant, and phosphorus chemical corrosion-resistant, passing electrical strength and aging tests.
Transformer Oil: Naphthenic oil, meeting breakdown voltage, moisture content, and oxidation resistance standards.
Seals and Accessories: Anti-aging, anti-loosening, and anti-corrosion, complying with mining safety standards.
3.2 Precision Manufacturing of Core Mining Components
Iron Core: High-precision longitudinal/transverse shearing, deburring, insulation treatment, and step stacking.
Winding: Wound in a constant temperature and humidity workshop, with accurate turns and tight uniformity, and enhanced mining insulation on the high-voltage side.
Oil Tank: Steel plate welding, kerosene leakage test, and heavy anti-corrosion coating, suitable for long-term outdoor use in mining areas.
Body Assembly: Dust-free exclusive assembly for mining, silver-copper welding of leads, reliable conductivity, and high mechanical strength.
3.3 Vacuum Drying and Final Assembly
Two-way vacuum hot air drying to completely remove insulation moisture.
High-vacuum oil filling (≤133Pa, pressure holding ≥24h), free of bubbles and leakage, with stable insulation.
Installation of complete mining accessories such as bushings, voltage regulators, oil level gauges, temperature controllers, and pressure relief valves, and overall inspection.
4. Factory Acceptance Test (FAT) – Full Compliance for Mining
Each transformer undergoes a complete factory test, with a FAT report issued and data traceable, meeting the operation requirements of mining applications.
4.1 Routine Tests
Verification of winding DC resistance, voltage ratio, and connection group.
Measurement of insulation resistance, absorption ratio, polarization index, and dielectric loss.
Test of no-load/load loss and short-circuit impedance.
Analysis of breakdown voltage, moisture content, and chromatography of transformer oil.
Verification of sealing test, voltage regulator switch, and protection device.
4.2 Type Tests
Temperature Rise Test: Verifies the stability of continuous operation at high temperatures in mining areas.
Lightning/switching Impulse Test: Inspects overvoltage tolerance.
Partial Discharge Measurement: Discharge quantity ≤100pC at 1.5Um/√3.
Sound Level Measurement: ≤60dB (A), meeting mining requirements.
Short-Circuit Withstand Test: Ensures equipment safety under mine fault conditions.
4.3 Special Mining Tests (Optional)
Winding Deformation Test (Frequency Response Method).
Accelerated Insulation Aging Test, design life ≥30 years.
Extended tests for harmonic load, anti-seismic, and mining corrosion environment.
5. Exclusive Packaging, Transportation, and Cross-Border Delivery for Phosphate Mines
5.1 Mining Reinforced Protective Packaging
Vulnerable parts (bushings, radiators) are individually packaged for shock resistance.
The oil tank is filled with dry nitrogen (0.02~0.03MPa) to protect insulation and oil quality, preventing moisture and dust intrusion during long-distance transportation.
The body is equipped with wooden brackets and waterproof, dustproof, and anti-corrosion cloth; accessories are packed in classified wooden boxes, marked with center of gravity, lifting points, moisture-proof, shock-proof, and no inversion signs.
Attached documents: Certificate of conformity, FAT report, French/English bilingual mining installation manual, packing list, and certification.
5.2 Cross-Border Logistics for Mining Areas
The body weighs about 15 tons, shipped by container to Casablanca.
Handling of oversized transportation permits for Moroccan mining areas inland, planning the optimal route to avoid height and weight limits.
Full-process 3D impact recorder to monitor vibration and impact, ensuring zero damage during transportation and direct delivery to mining areas.
6. On-site Installation, Commissioning, and Operation in Mining Areas
6.1 On-site Unpacking Acceptance (Jointly with Customer, Power, and Mining Parties)
Appearance Inspection: No bumps, rust, intact sealing, and no leakage.
Accessory Check: Counted according to the packing list, no missing or wrong delivery.
Status Detection: Normal nitrogen pressure and qualified impact recorder data.
Document Verification: Complete compliant documents, meeting mining grid connection acceptance.
6.2 On-site Installation Guidance for Mining
Foundation Placement: Leveled and fixed, meeting load-bearing and anti-seismic requirements of mining areas.
Accessory Reinstallation: Bushings, radiators, oil conservators, voltage regulating devices, and protection control circuit wiring.
Vacuum Oil Filling and Standing: Oil filling in accordance with mining specifications, standing for ≥24h for full exhaust.
Grounding System: Reliable lightning protection grounding and protective grounding, complying with mining safety specifications.
6.3 On-site Handover Test (SAT)
Re-test of insulation and oil quality; recheck of DC resistance, transformation ratio, and connection group.
Re-test of AC withstand voltage and partial discharge; comparison of winding deformation.
Joint commissioning of protection devices, temperature controllers, and pressure relief valves for mining.
6.4 Power-on Trial Operation in Mining Areas
Five no-load impulse closing operations to check excitation inrush current and protection action.
24h no-load operation, no abnormal noise, heating, or leakage.
Gradual voltage boost with load, 24h full-load trial operation, and official operation after stability.
Chinese technicians on-site duty, providing mining emergency treatment and operation training.
7. Full-Process Quality Control (Full-Chain Traceability for Mining)
Design: Mining compliance review, production only after scheme freezing.
Materials: 100% re-inspection of core materials, no unqualified materials entering the factory.
Production: 100% process inspection of key processes, dust-free mining assembly.
Factory: Complete FAT test, no unqualified products leaving the factory.
Transportation: Full-process monitoring and data archiving.
On-site: Comparison of SAT and factory data to ensure no attenuation of mining performance.
8. As-built Documents and Mining Operation and Maintenance Support
Deliver complete technical documents to Moroccan mining parties:
Product Certificate, factory FAT, and on-site SAT test reports.
French/English bilingual mining installation, operation, and maintenance manuals.
Assembly drawings, dimension drawings, foundation drawings, and electrical schematic diagrams.
Certifications such as IEC, CE, ISO, and ANSI.
Provide lifelong mining operation and maintenance guidance, spare parts, and on-site technical support.
9. Solution Summary
HENGFENGSHUAI ELECTRIC's full-solution for 3MVA-132kV phosphate mining transformers in Morocco is not a simple equipment export, but a deep customization + full-cycle mining service. It accurately matches the four core demands of Moroccan power grid standards, extreme phosphate mine environments, heavy-duty mining conditions, and grid-connected mining compliance, effectively solving the pain points of traditional transformers in mining areas, such as high loss, poor heat dissipation, intolerance to dust corrosion, easy failure, and slow delivery. The product has been implemented and operated in large phosphate mines in Morocco, highly recognized by mining and power departments.
For customized solutions, quotation lists, and mining technical whitepapers of 3MVA/5MVA/10MVA 132/6kV phosphate mining transformers adapted to Morocco, please contact us via email: hfs@hengfengshuai.com. HENGFENGSHUAI ELECTRIC provides you with a one-stop mining power solution.