Leveraging our integrated industry and trade manufacturing advantages, we have recently completed the customized production and shipment of SFZ25000KVA 115/38.5kV three-phase oil-immersed on-load voltage-regulating all-copper power transformer. This equipment serves the key substation reconstruction project in Ukraine, providing high-reliability core power equipment for the local aging power grid upgrading and effectively boosting the stability and capacity of regional power transmission systems.

I. Project Background & Core Customer Pain Points

This project focuses on the renovation and reconstruction of a key substation in Ukraine. The original old main transformers on site have been in service for a long time, featuring high operation loss, insufficient voltage regulation performance and poor adaptability to extreme climates. The local power grid has long been faced with severe operating challenges including large grid voltage fluctuations and extremely cold winter temperatures.

Ukraine’s power grid implements strict DSTU national standards and IEC 60076 international specifications. Imported high-voltage power equipment must obtain UA TR conformity certification before customs clearance and grid connection. The customer put forward stringent and targeted requirements for this reconstruction project:

1. The original non-load tap-changing transformers cannot stabilize voltage during grid load fluctuations, requiring on-load voltage regulation design to ensure real-time and stable power supply.
2. The local winter minimum temperature drops to -25°C, and conventional transformers suffer from poor low-temperature start-up performance and sealing failure risks, requiring special anti-freezing and low-temperature resistant structural optimization.
3. The substation reconstruction schedule is extremely tight. The whole process from drawing confirmation and production to final shipment must be completed within 60 days, while the average delivery cycle of local Ukrainian manufacturers exceeds 90 days, which cannot meet the project progress requirements.
4. To ensure long-term continuous and stable operation of the substation, the transformer is required to adoptall-copper windingsto reduce operational loss and daily maintenance costs.

Based on in-depth research on Ukraine’s grid standards, severe cold working conditions and urgent project schedule, our technical team customized a full-set high-efficiency and low-temperature resistant power transformer solution for the client

 

II. Core Customized Technologies Adapted to Ukraine’s Severe Cold Grid Conditions

The SFZ25000KVA 115/38.5kV main transformer exported to Ukraine is fully equipped with pure copper windings and optimized with multiple targeted upgrades for local extreme climates and grid characteristics, with outstanding technical advantages:

1. All-copper Winding & Low-loss Core for Energy Saving

High and low voltage windings adopt 100% pure copper conductors, featuring excellent electrical conductivity, high mechanical strength and strong short-circuit impact resistance. The core is made of high-permeability grain-oriented silicon steel sheets with multi-stage lap stacking technology, making no-load and load losses far lower than IEC standard values, effectively reducing long-term grid transmission loss and operational power consumption.

2. On-load Voltage Regulation for Fluctuating Grid Adaptation

Equipped with high-quality on-load tap changer, the transformer can adjust voltage in real time with load operation, stably coping with ±10% grid voltage fluctuation in Ukraine, ensuring stable output of 38.5kV voltage and avoiding equipment shutdown and damage caused by abnormal voltage.

3. Special Anti-freezing Design for Ultra-wide Temperature Operation

The oil tank and radiator adopt thickened folded steel plate structure with low-temperature resistant special rubber seals. Low-temperature anti-freezing insulating oil is configured to support stable operation in the temperature range of -25°C to +40°C. The external anti-corrosion and low-temperature resistant coating effectively resists frost and rain erosion, and the optimized heat dissipation structure ensures controllable temperature rise under full load and no condensation under low-temperature no-load conditions.

4. Intelligent Monitoring System for Centralized Grid Management

Standard equipped with online temperature monitoring sensors for oil surface and windings, and reserved remote monitoring interfaces. It can be connected to the substation automatic control system to real-time monitor oil level, temperature and partial discharge data, realizing early fault warning and reducing manual operation and maintenance pressure.

5. High-level Insulation Compliant with Local Certification Standards

Adopts high-grade insulating materials, with partial discharge indicators far exceeding international and Ukrainian DSTU standards. The bell-type oil tank facilitates on-site maintenance, and the capsule-type oil conservator slows down the aging of insulating oil, greatly extending the service life and maintenance cycle of the equipment.

[Insert Image 3: Full-performance factory testing of transformer]

III. Integrated Industry & Trade Strength: 60-day Ultra-fast Delivery & Full Compliance

Ukraine implements strict market access rules for imported power equipment, and UA TR conformity certification is a mandatory prerequisite for customs clearance and grid connection. Relying on our complete industrial and trade integrated industrial chain, we provide one-stop full-cycle services including customized design, independent production, strict testing, certification assistance and export packaging for this project.

Full-standard Factory Testing & Complete Compliance Documents

The main transformer has passed all routine tests before delivery, including DC resistance test, voltage ratio test, insulation withstand test, no-load & load loss test and short-circuit resistance test. We provide complete bilingual technical reports and assist customers in completing UA TR conformity certification, ensuring zero-delay customs clearance in Ukraine.

Independent Production Shortens Delivery Cycle

With self-owned fully automatic production lines covering core processing, winding assembly, vacuum drying and final assembly, we realize independent production without outsourcing. We complete drawing confirmation, mass production and full testing efficiently, greatly compressing the production cycle.

Export-grade Shockproof & Moisture-proof Packaging

The whole machine adopts reinforced steel structure fixing and multi-layer waterproof and rust-proof packaging, equipped with transportation vibration monitoring devices, which can fully adapt to long-distance ocean transportation and inland road transportation in Eastern Europe, avoiding equipment damage during transit.

60-day Whole-cycle Efficient Delivery

From contract signing and technical drawing confirmation to finished product testing and shipment, the whole project cycle is only 60 days, 30% shorter than the industry average, perfectly meeting the urgent construction schedule of the Ukraine substation reconstruction project.

IV. Project Achievements & Overseas Market Layout

After official commissioning, the SFZ25000KVA 115/38.5kV all-copper main transformer will completely replace the aging high-loss equipment of the substation, thoroughly solving local problems such as unstable grid voltage and frequent equipment failures in low-temperature environments. It is estimated to reduce the comprehensive line loss of the substation by more than 12%, significantly improving the power supply stability and grid bearing capacity of the regional power system, and providing reliable power guarantee for local industrial production and residential electricity consumption.

Our overseas project director stated that the successful delivery of this Ukraine substation project fully demonstrates our core advantages of industry-trade integration. Different from pure trading companies, we can provide customized high-voltage transformer solutions compliant with European and CIS national standards, as well as full-life cycle services including technical design, independent production, certification processing, cross-border logistics and after-sales technical guidance.

In the future, we will continue to deeply cultivate the power grid renovation market in Ukraine and Eastern Europe. With high-efficiency energy-saving and extreme weather resistant power equipment, we will continuously deliver high-quality Chinese manufacturing solutions for global power infrastructure upgrading.