Specialized High Voltage Distribution Transformers for KPLC Infrastructure Projects
Visão geral do projeto
Tengyi recently launched a major supply project of 33kV Distribution Transformers for the Kenya Power and Lighting Company (KPLC) grid upgrade. In collaboration with a prominent local installation firm, we are committed to supplying a total of 1,600+ high-performance distribution transformers. Accordingly, the first batch of 135 units has successfully passed factory inspections and is now in transit. These units were specifically engineered to withstand Kenya’s challenging climate and meet KPLC’s stringent technical benchmarks.
Technical Solutions: Optimized for 33kV High-Voltage Grids
To address the regional 33kV distribution requirements, we provided a versatile portfolio of 25kVA and 50kVA units. The 50kVA series, specifically engineered for this project, features the following specifications:
- Superior Insulation Safety: With a primary voltage of 33kV, these units feature a 170kV Lightning Impulse Level (BIL) and 70kV Power Frequency Withstand. This reinforced insulation ensures long-term grid stability in high-altitude and lightning-prone regions across Africa.
- Premium Material Options: Based on the specific technical requirements of different project segments, we provided both high-performance copper winding and cost-effective aluminum winding options. The copper units offer superior thermal stability and lower operational losses (No-load loss as low as 160W).
- Standards & Accessories: Fully compliant with the IEC 60076 series. Utilizing the Dyn11 vector group to suppress harmonics, the transformers are equipped with utility-standard accessories, including Oil Temperature Indicators (OTI), pressure relief devices, and conservator tanks.
| No. | Parameter | Especificação |
| 1 | Tipo de transformador | Oi-immersed, self-cooled (ONAN) |
| 2 | Model | S-M-50-33/0.415 |
| 3 | Capacidade nominal | 50 kVA |
| 4 | Primary Voltage (HV) | 33,000 V (33 kV) |
| 5 | Secondary Voltage (LV) | 415 V, 3-phase, 4-wire |
| 6 | Phase-to-Neutral Output | 240 V |
| 7 | Frequência | 50 Hz |
| 8 | Grupo Vector | Dyn11 |
| 9 | Método de resfriamento | ONAN (Oil Natural Air Natural) |
| 10 | Material do enrolamento | Copper |
| 11 | No-Load Loss | 160W |
| 12 | Load Loss (at 75 C) | 1,200W |
| 13 | No-Load Current | 0.6% |
| 14 | Impedance Voltage (at 75 C) | 4% +/- 10%tolerance |
| 15 | Tap Changer | DETC, HV side, +/- 2×2.5% |
| 16 | Max Ambient Temperature | 40 C |
| 17 | Max Winding Temperature Rise | 65K (avg)/ 78K (hot spot) |
| 18 | Max Oil Temperature Rise | 55 K |
| 19 | HV BIL (Lightning Impulse,full wave) | 170 kV (peak) |
| 20 | HV Chopped Wave Impulse | 195 kV (peak) |
| 21 | HV Power Frequency Withstand | 70 kV (RMS, 1min) |
| 22 | LV Power Frequency Withstand | 5 kV (RMS, 1min) |
| 23 | Maximum Altitude | 1,000 m |
| 24 | Permissible Short-Circuit Duration | 2 seconds |
| 25 | Insulation Level | Per IEC 60076-3 (33 kV class) |
| 26 | Noise Level | 53 dB (A) |
| 27 | Tank Type | Sealed or conservator type |
| 28 | Finish | Light gray or RAL 7035 |
| 29 | Dimensions (L×W×H) | 980×800×1,700 mm |
| 30 | Total Mass | 0.77t (Active: 0.3t, Oil: 0.265t) |
| 31 | Applicable Standards | IEC 60076-1,-2,-3,-5,-10 |
| Standard Accessories: · Conservator tank with oil level indicator · Pressure relief device · Oil Temperature Indicator (OTI) · Oil drain valve and sampling valve · Lifting lugs and jacking pads · Earthing terminals (min.2) · Nameplate and rating plate per IEC 60076 | ||
Mass-Scale Supply and Reliable Delivery
To manage the total commitment of 1,600+ units effectively, Tengyi has established a robust sequential delivery mechanism. For this initial 135-unit shipment, we implemented specialized export protocols to address the challenges of maritime and inland transit:
- Risk Mitigation: Units were sealed in moisture-proof film and enclosed in heavy-duty export crates with professional container anchoring. This prevents oxidation from salt air and eliminates risks such as bushing breakage or internal core displacement caused by rough transit conditions.
- Efficient Logistics: All packaging materials are ISPM 15 compliant, ensuring seamless customs clearance at the Port of Mombasa and timely arrival at the installation sites.
Summary
The successful dispatch of the first 135 units marks the start of our 1,600-transformer rolling supply plan for Kenya. This large-scale infrastructure commitment reaffirms Tengyi’s capacity as a premier supplier for utility-grade, high-voltage projects. Ultimately, this partnership provides the sustained “Technical Certainty” needed for the successful modernization of Kenya’s power grid.
Empower Your Grid with Tengyi’s Specialized Global Expertise
Tengyi delivers the technical certainty your critical grid projects demand across the globe. From our 33kV Utility-Grade Solutions , optimized for African power grids, to our Americas Exclusive Series (IEEE/ANSI Standards), our expert team provides the technical precision and secure logistics needed to ensure stable, long-term operation in even the most challenging environments.
