Uzbekistan National Electric Grid 6300 kVA – 115/11 kV Transformers: Delivery of 3 Main Units and Technical Selection Guide
Writer： Hengfeng you electric Time：2026-08-28 views：times
Uzbekistan National Electric Grid 6300 kVA – 115/11 kV Transformers: Delivery of 3 Main Units and Technical Selection Guide
Keywords: Uzbekistan National Electric Grid, 6300 kVA – 115/11 kV transformer, 6300 kVA transformer, Uzbekistan grid modernization
Description/Abstract: This article provides a detailed explanation of the technical parameters, environmental adaptability, and certification standards of three custom‑built 6300 kVA – 115/11 kV transformers produced by Hengfengyou Electric for the Uzbekistan National Electric Grid project. From market demand to solutions, it comprehensively analyzes how this batch of main transformers supports the upgrading of the Central Asian power grid. The article is interpreted by the Central Asia Sales Manager of Hengfengyou Electric, covering industry prospects, market access conditions, and solutions.
I. Market Demand Analysis for 6300 kVA – 115/11 kV Transformers in the Uzbekistan National Electric Grid
1. Current Status of Uzbekistan’s Power Infrastructure
Uzbekistan, the most populous country in Central Asia, has seen continuous growth in industrial and agricultural electricity consumption in recent years. However, over 40% of the local grid equipment was built during the Soviet era and is severely aged, resulting in insufficient power supply reliability in some areas. The National Electric Grid of Uzbekistan is actively promoting grid modernization and plans to replace thousands of high‑loss transformers within the next five years. Against this backdrop, the 6300 kVA – 115/11 kV transformer has become the preferred model for substation expansion due to its moderate capacity and voltage level that matches the connection needs between the main grid and the distribution network.
2. Positioning of the 6300 kVA – 115/11 kV Transformer in Uzbekistan’s Grid
The 115 kV high‑voltage side can be directly connected to the national main grid, while the 11 kV low‑voltage side flexibly adapts to regional distribution networks, balancing long‑distance transmission and large‑capacity distribution. For the Uzbekistan National Electric Grid, the 6300 kVA transformer is a key node device linking the 115 kV transmission system and the 11 kV distribution network, widely used in small and medium‑sized substations and industrial park power supply. The three 6300 kVA – 115/11 kV transformers purchased in this project are intended to replace the core main transformers of an old substation in the Tashkent region, thereby improving regional power supply stability.
II. Customer Requirements and Environmental Challenges for the 6300 kVA Transformers in the Uzbekistan National Electric Grid
1. Special Requirements for Equipment Design Imposed by Extreme Climate
Uzbekistan has a continental climate, with summer temperatures exceeding 45°C and winter temperatures dropping to –20°C, accompanied by frequent dust storms in some areas. These conditions impose stringent requirements on the heat dissipation system, sealing performance, and insulating oil stability of the 6300 kVA – 115/11 kV transformers. The customer explicitly required that the transformers be capable of continuous full‑load operation within an ambient temperature range of –25°C to +45°C and possess an IP54 protection rating to prevent dust ingress.
2. Alignment of Technical Parameters and Standards
The Uzbekistan National Electric Grid operates under a dual‑track system that parallels GOST standards and IEC standards. For 115 kV main transformers, the customer required that no‑load loss and load loss both meet Grade 2 energy efficiency of GOST R 52719‑2007, while short‑circuit impedance be controlled at 6% ±10%. In addition, the 11 kV low‑voltage outlets needed to be equipped with electric operating mechanisms to accommodate remote centralized control. During the design phase, Hengfengyou Electric aligned each parameter with Uzbek engineers to ensure that every 6300 kVA transformer fully complied with on‑site operating conditions.
III. Certification Requirements and Normative Standards for the 6300 kVA – 115/11 kV Transformers in the Uzbekistan National Electric Grid
Bella, Central Asia Sales Manager of Hengfengyou Electric (hfy@hengfengyou.com), offers a friendly reminder to transformer export companies aiming to enter the Uzbekistan National Electric Grid project: Uzbekistan’s regulatory system for imported power equipment is strict, mainly involving the following policies and certification requirements.
1. Mandatory Certification and Customs Clearance Documents
All transformers entering the Uzbekistan National Electric Grid must obtain Uzbekistan Certification, commonly known as GOST‑UZ certification. The certification requires the provision of the factory’s ISO 9001 quality system certificate, product type test reports (based on GOST or IEC 60076 standards), and insulating oil test reports. The certification cycle is usually 4–6 weeks and requires sampling by a locally authorized laboratory in Uzbekistan or acceptance of the factory’s self‑inspection reports. In addition, customs clearance requires a Technical Passport in Russian or Uzbek, detailing all technical parameters and factory test results of the 6300 kVA – 115/11 kV transformers.
2. Certification Advantages of Hengfengyou Electric
Hengfengyou Electric has already obtained GOST‑UZ certification in advance and possesses complete type test reports for 115 kV transformers. For the three 6300 kVA transformers in this batch, the factory completed all routine and type tests before delivery, including induced over‑voltage withstand test, partial discharge measurement, and temperature rise test, ensuring that the equipment can quickly pass local acceptance and be put into operation after arriving in Uzbekistan.
IV. Solution and Technical Advantages of the 6300 kVA Transformers for the Uzbekistan National Electric Grid
1. Quantifiable Energy‑Saving Benefits
The SFZ12‑6300 kVA – 115/11 kV transformers customized by Hengfengyou Electric for this project adopt a new type of low‑loss CRGO oriented silicon steel core. Compared with the traditional S11 series, no‑load loss is reduced by approximately 15% and load loss by about 8%. Based on an annual operation of 8,000 hours in the Uzbekistan grid, each transformer can save about 40,000 kWh of electricity per year, equivalent to a reduction of 33 tons of CO₂ emissions. For the Uzbekistan National Electric Grid, which purchased three main transformers, this translates into significantly lower operating electricity expenses over the entire life cycle.
2. Short‑Circuit Resistance and Reliability Design
Electromagnetic simulation software was used to model extreme short‑circuit conditions, optimizing winding ampere‑turn balance and core clamping structure. This batch of 6300 kVA transformers can withstand a short‑circuit current impact of 40 kA/2s, far exceeding the Uzbek grid’s standard requirement of 16 kA. At the same time, the oil tank adopts a fully sealed corrugated‑fin structure, effectively compensating for volume fluctuations caused by oil temperature changes and extending the service life of the insulating oil to more than 15 years.
3. Competitive Advantages Compared with Rivals
Comparison Item
Hengfengyou Electric 6300 kVA – 115/11 kV
Local Traditional Supplier
European Brand
Delivery Time
8–10 weeks
12–16 weeks
20–24 weeks
Price Level
Moderate (best cost‑performance)
Low but high loss
High
Certification Support
GOST‑UZ already obtained
Local certification
Needs re‑application
After‑Sales Response
24‑hour remote + local agent
Slow
Slow
V. Conclusion
The successful delivery of the 6300 kVA – 115/11 kV transformer project for the Uzbekistan National Electric Grid once again demonstrates Hengfengyou Electric’s profound accumulation in the Central Asian power market. From precisely matching market demand to overcoming extreme climate challenges, from rapidly obtaining GOST‑UZ certification to quantifiable energy‑saving advantages, every 6300 kVA transformer carries the reliable quality of Chinese manufacturing. If you are looking for a transformer supplier for the Uzbekistan National Electric Grid project, or need a customized solution for the 115/11 kV voltage level, please contact us at any time for a quick quotation and technical support.
Hengfengyou Electric successfully entered the Uzbekistan power market in 2018. Transformer products customized for Uzbekistan, including 10 kV distribution transformers, 35 kV distribution transformers, 35 kV electric furnace transformers, and 35 kV rectifier transformers, have participated in multiple local project bids and are favored by Uzbek electrical engineering companies. With 30 years of manufacturing experience, we offer quick quotations and fast delivery. Hengfengyou Electric will provide you with the optimal electrical product solution.
Email: hfy@hengfengyou.com
VI. Data Sources
National Electric Grid of Uzbekistan (NEGU) 2024 Grid Modernization Plan White Paper, source: https://www.negc.uz
World Bank “Uzbekistan Energy Sector Assessment Report” (2023), source: https://www.worldbank.org
GOST R 52719‑2007 “Energy Efficiency Standards for Power Transformers,” source: Russian Federal Technical Standards and Metrology Agency official website
