1. Project Overview | Custom PV Containerized Substation Solution for South Africa, Adapted to Plateau Desert PV Power Station Conditions

 

Project Information	Details
Country	South Africa
Industry	Photovoltaic Power Generation
Project Type	Utility‑scale Ground‑mount PV Power Station
Implementation Year	2026
Equipment	2000kVA PV Oil‑immersed Containerized Substation
Unit Capacity	2000kVA per unit, bulk supply available

2. Project Background

 

A local South African PV EPC enterprise procures highly reliable step‑up containerized substations for large‑scale ground‑mount PV plants located on plateaus, deserts and coastal zones. The site features harsh and complex operating conditions: extreme high‑temperature exposure under strong sunlight on plateaus, large day‑night temperature differences, inland dust erosion, coastal salt spray corrosion, frequent PV power fluctuation and harmonic disturbance from inverters. The site is remotely located with limited on‑site maintenance resources. Meanwhile, the equipment shall strictly comply with SANS 780, IEC 60076 and Eskom grid connection specifications. Full sets of compliant English documentation are required for import customs clearance review. The customer selected Qingdao Hengfengshuai Electric to deliver a complete factory‑integrated custom containerized substation solution, ensuring stable operation over the 25‑year design service life of the power plant.

3. Customer Requirements

        *  Conform to IEC 60076 and SANS 780 standards, satisfy Eskom grid connection codes, adapt to harmonic conditions of PV inverters and control the risk of harmonic heating.

        *  Operate reliably under alternating extreme temperatures from ‑10℃ to +48℃, with a maximum day‑night temperature difference of 32℃. Compatible with inland dust accumulation and coastal salt spray environments under long‑term UV radiation; heat dissipation performance remains stable at high altitudes for continuous full‑load operation under high ambient temperature.

        *  Adapt to intermittent PV output fluctuation and rapid power variation of inverters, with enhanced harmonic resistance and sufficient temperature rise margin to withstand short‑term overload shocks.

        *  C5‑M marine heavy‑duty anti‑corrosion coating and fully sealed structure to suppress internal condensation caused by diurnal temperature cycling. The coating on tank and enclosure is verified to ISO 12944‑6 C5‑M. Enclosure protection grade IP54; relative humidity inside control cabinet ≤60%. All exposed fasteners adopt 304 stainless steel.

        *  Deliver full English technical documentation for customs clearance and grid acceptance: English FAT reports, general assembly drawings, wiring diagrams, type test reports, operation & maintenance manuals, BOM lists and instrument calibration certificates. Certificate of origin can be provided upon request.

        *  Shockproof and moisture‑proof packaging for transoceanic shipment: resistant to vibration impact of 2–200Hz; capable of withstanding high humidity inside cargo holds during 45‑day ocean transit. All modules are pre‑assembled in factory to reduce on‑site installation and commissioning workload.

4. Engineering Solution: 2000kVA 0.4‑0.8kV/33kV PV Containerized Substation

   

Hengfengshuai Electric provides custom PV step‑up containerized substations. Our scope covers customized R&D and simulation, full electrical structure optimization, factory FAT acceptance, special marine packaging, delivery of complete English data packages and remote technical support.
 

Customized Optimizations

        *  50Hz Electromagnetic Simulation & Enhanced Temperature Rise Margin Full‑condition electromagnetic simulation is performed according to South Africa’s 50Hz grid frequency. Core flux density is optimized, internal oil cooling channels are widened, and anti‑oxidant mineral insulating oil is selected to reserve sufficient temperature rise margin. Continuous full‑load stable operation is guaranteed at +42℃ ambient temperature, with short‑term tolerance for peak ambient temperature up to +48℃.

        *  Dy11 Harmonic‑resistant Reinforced Copper Winding High‑purity electrolytic copper winding with harmonic‑resistant reinforced structure. Dy11 vector group effectively suppresses 3rd harmonics generated by inverters, reduces additional eddy‑current loss caused by harmonics and withstands short‑term PV overload shocks triggered by cloud shading and rapid power variation.

        *  Fully Sealed Anti‑condensation Structure Aging‑resistant sealing components are adopted for all flanges and bushing seats. Double rubber sealing strips are equipped. Every unit passes 50kPa pressure holding test for 12 hours without pressure drop to block moisture ingress and eliminate insulation dampness risk caused by large temperature difference in desert areas.

        *  C5‑M Marine Heavy‑duty Anti‑corrosion Enclosure & Tank Metal substrate blast cleaning roughness controlled at 60–75μm. Five‑layer coating system: epoxy zinc‑rich primer, intermediate coat and weather‑resistant polyurethane topcoat. It meets ISO12944‑6 C5‑M marine heavy‑duty anti‑corrosion standard, passing 1440h neutral salt spray test and 2000h UV accelerated aging test. Coating design service life ≥20 years. All exposed fasteners are 304 stainless steel.
 

Auxiliary Components

        *  Anti‑pollution HV Bushing: 33kV composite anti‑pollution bushing with extended creepage distance, suitable for heavily polluted sites with ESDD 0.2–0.55mg/cm²; complies with lightning impulse withstand requirements.

        *  Temperature controller, Buchholz relay and pressure relief valve with alarm signal output, supporting remote monitoring integration of the power plant.

        *  ONAN oil natural air natural cooling system. External cooling fans are omitted to avoid fan stall failure induced by dust and lower on‑site maintenance workload.

        *  Full set of English drawings, type test reports, FAT reports, O&M manuals and spare parts list.

5. Main Technical Data

 

Parameter	Specification
Rated Capacity	2000kVA, bulk supply available
Rated Frequency	50Hz
Rated Ratio	0.4‑0.8kV ±2×2.5% /33kV (Max. operating voltage Um=36kV)
Equipment Type	Oil‑immersed PV Containerized Substation (Factory Pre‑fabricated Module)
Tap Changer	Off‑circuit tap changer ±2×2.5%
Cooling Mode	ONAN
Vector Group	Dy11
Design Ambient Temperature	Max. +42℃, extra temperature margin reserved, short‑term peak +48℃ acceptable
Winding Material	High‑purity electrolytic copper, harmonic‑resistant reinforced winding
Insulation Level	33kV side complies with IEC / SANS lightning impulse and power frequency withstand standards
Short‑circuit Impedance	6%–8%
Anti‑corrosion Grade	C5‑M marine heavy‑duty, ISO12944‑6, 1440h salt spray test passed
Noise Level	≤68dB(A), measured 1.5m from enclosure wall under full load
Applicable Standards	IEC 60076, SANS 780, IEC62271‑202, compliant with Eskom grid connection codes
Design Service Life	25 years

6. Manufacturing Process

        *  Incoming Raw Material Inspection (Copper Winding, Silicon Steel Sheet, Seals): Copper purity ≥99.97%; iron loss sampling test for silicon steel sheet; aging and UV resistance verification for sealing strips.

        *  Winding Fabrication & Harmonic Overload Reinforcement: Harmonic‑resistant winding process. High‑temperature binding material is used for end fastening to reduce harmonic eddy loss and resist frequent PV power shocks.

        *  Core Assembly & Noise Reduction Buffer Treatment: Winding clamping force tolerance ±5%. Buffer pads are installed between core assembly and tank to damp alternating electromagnetic noise.

        *  Enclosure & Tank Blast Cleaning and Multi‑layer Anti‑corrosion Coating: Blast roughness 60–75μm. Film thickness inspection for each coating layer. UV‑stable topcoat passed 2000h UV accelerated aging test.

        *  Complete Unit Assembly, Fitting Installation & Sealing Verification: Double rubber sealing strips for cabinet doors. 50kPa pressure holding test for 12 hours without pressure drop to prevent condensation and dust penetration.

        *  Factory Integration & Protection Device Interlock Debugging: HV compartment, transformer body and LV protection unit are pre‑integrated in factory. Alarm interlock of temperature controller, Buchholz relay and pressure relief valve is fully calibrated.

        *  IPPC Certified Marine Packaging: IPPC heat‑treated steel base + plywood case. Optional 3D shock recorder for transport impact monitoring. Desiccants inside package to meet moisture protection requirement for 45‑day ocean shipment.

 

7. Testing & Quality Control

 

All units complete full factory acceptance tests before delivery. Witness Test (WTT) by SGS / BV third party is available.
 

        *  Routine Tests: Winding DC resistance, voltage ratio, vector group, no‑load loss, load loss, short‑circuit impedance.

        *  Dielectric Tests: Power frequency withstand voltage, lightning impulse test.

        *  Temperature Rise Simulation Check: Simulate extreme high‑temperature plateau conditions of South Africa plus harmonic loss from PV inverters to verify temperature rise margin.

        *  Sealing & Anti‑corrosion Verification: C5‑M sample 1440h salt spray aging test; 50kPa /12h tightness test for complete unit.

        *  Protection Interlock Test: Alarm and signal output linkage calibration for temperature controller, Buchholz relay and pressure relief valve.

        *  English FAT report issued together with full grid‑connection and customs clearance data package.

 

8. Delivery & Installation

        *  Packaging: Oil‑filled shipment; IPPC steel base + plywood case; 3D shock recorder optional to record vibration during ocean transit.

        *  Logistics: Container shipping across Indian Ocean to South African ports. Shockproof and moisture‑proof protection for 45‑day high‑humidity cargo hold environment.

        *  Document Handover: Full English technical package and customs clearance documents delivered before shipment.

        *  On‑site Execution: Lifting onto precast concrete foundation, cable termination, earthing installation, SAT site acceptance and step‑by‑step energization commissioning. Factory pre‑assembly greatly cuts on‑site working hours.

 

9. Project Outcome

 

The 2000kVA PV containerized substation has completed fabrication, FAT inspection and ocean shipment to the South Africa PV plant. After site installation, SAT acceptance and energization commissioning, the equipment steps up 0.4‑0.8kV power from inverters to 33kV collection voltage, fully satisfying Eskom grid connection requirements. It is qualified for plateau high solar exposure, inland dust and coastal salt spray in South Africa and supports 25‑year design service life of the PV station.


 

10. Related Products

        *  Containerized Substation

        *  Overseas New Energy Step‑up Transformer

11. Contact Us

 

Planning PV and wind power projects in South Africa and other African regions?

Welcome to contact our engineers for technical discussion.

    Request the Solution     

 

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Project Name	2000 kVA 33/0.4-0.8 kV Containerized Substation Solution for Solar PV Project in South Africa
Industry	Solar PV (renewable energy) · Step-up and collection for ground-mounted PV plants
Project Location	South Africa (highland, desert and coastal PV sites)
Related Products	2000 kVA 0.4-0.8/33 kV oil-immersed PV step-up containerized substation (prefabricated enclosure)
Applicable Standards	IEC 60076, SANS 780, IEC 62271-202/200; compliant with Eskom grid connection code
Voltage Level	0.4-0.8 kV / 33 kV (Um = 36 kV)
Project Year	2026-10-09
Project Status	Solution released; customized manufacturing and delivery on order
Author	Operation Department, HENGFENGSHUAI ELECTRIC
Reviewer	Technical Department, HENGFENGSHUAI ELECTRIC
Published Date	2026-10-09
Last Updated	2026-11-06
Company Introduction	HENGFENGSHUAI ELECTRIC  specializes in manufacturing and sales of electrical equipment, delivering integrated power transmission and distribution solutions for customers worldwide.
Disclaimer	This article is for reference only and does not constitute an offer, promise or contractual basis; product specifications, technical parameters and lead times mentioned herein are subject to the official contract; the company shall not be liable for any loss arising from the use of this information; external data and industry information cited belong to the original authors or third parties and are for reference only.
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