20kV Three-phase Distribution Transformer For European Tier-2

• Junengda 20kV three-phase Oil-Immersed Transformer   Overview>>>

The Junengda 20kV three-phase oil-immersed transformer is engineered to deliver exceptional performance in electrical power distribution and transmission systems. Designed for efficiency and durability, this transformer efficiently steps up or steps down alternating current voltages, ensuring stable operation under heavy loads and demanding environmental conditions.Crafted with high-quality cold-rolled silicon steel cores and oxygen-free copper windings, the Junengda 20kV transformer minimizes energy loss and maximizes conductivity, aligning with global standards for energy efficiency. Its robust construction features a multi-layer cylindrical winding structure and advanced anti-loosening fasteners, enhancing short-circuit resistance and mechanical stability for long-term reliability.

• Junengda 20kV  three-phase  Oil-Immersed Transformer Technical Specifications>>>

Rated Capacity(KVA)	Voltage Combination and Decomposition Ranges			Vector Group	No-load Loss(w)	Load Loss(w)	No-load current (%)	Short Circuit Impedance(%)
	High Voltage Tap Range（kv）	Tap Changing Scope（%）	Low Voltage (kv)
30	20	±5	0.4	Dyn11 Yzn11 Yyn0	100	690/660	2.10	6%
50					130	1010/960	2.00
63					150	1200/1150	1.90
80					180	1440/1370	1.80
100					200	1730/1650	1.60
125					240	2080/1980	1.50
160					190	2540/2420	1.40
200					340	3000/2860	1.30
250					400	3520/3350	1.20
315					480	4210/4010	1.10
400					570	4970/4730	1.00
500					680	5940/5660	1.00
630					810	6820	0.90	6%
800					980	8250	0.80
1000					1150	11330	0.70
1250					1380	13200	0.70
1600					1660	15950	0.60
2000					1950	19140	0.60
2500					2340	22220	0.50

• Junengda 20kV  three-phase  Oil-Immersed Transformer  Features>>>

Globally Certified Reliability

Junengda transformers are certified to ISO 9001, CCC, and IEC standards, ensuring safety and performance for international grids.

High-Demand Market Focus

Moreover, they dominate exports to Southeast Asia, Africa, and the Middle East, excelling in harsh climates and unstable grid conditions.

Industrial & Renewable Versatility

Additionally, Junengda units power mines, factories, and solar farms with their 30–5,000 kVA capacity and corrosion-resistant design.

Premium Core Construction

Featuring cold-rolled steel cores and oxygen-free copper windings, they cut energy losses by 15–30% versus conventional transformers.

Smart Resilience

Furthermore, integrated thermal sensors and anti-vibration frames ensure 24/7 reliability in converter-heavy HVDC applications.

• Junengda 20kV  three-phase Oil-Immersed Transformer advantage>>>

Enhanced Safety

Junengda transformers feature triple-sealed gaskets and corrosion-resistant tanks to prevent leaks, while pressure sensors provide real-time overheating alerts for fire prevention.

Operational Stability

With EI-laminated silicon steel cores and oxygen-free copper windings, these units resist vibrations and short circuits, and PLC-controlled cooling maintains stability under load shifts.

Low Maintenance Costs

Our IoT-ready design enables remote monitoring via LabVIEW, slashing onsite inspections by 40% while extending service intervals beyond 10 years.

Space Efficiency

Junengda’s compact vertical cooling design delivers up to 5,000kVA capacity in 20% smaller footprints, optimizing space in urban substations or rooftop installations.

Eco-Friendly Performance

Exceeding GB 20052-2020 standards, Junengda transformers cut losses to 80W/kVA (no-load) and 630W (load), and use biodegradable oil to reduce carbon footprint by 35%.

Energy Savings

Spiral coil windings and toroidal cores lower eddy losses by 15%, while ANSYS-optimized controls help operators save 25% in annual electricity costs.

 

Why choose Junengda?

Choose Junengda for safety-engineered, space-smart transformers that drive operational savings across global power networks.

 

 

• Junengda 20kV three-phase   Oil-Immersed Transformer  Case>>>

1.High-Efficiency Power Quality Management in Suzhou Industrial Park, China

Junengda’s 20kV three-phase oil-immersed transformers were deployed in Suzhou Industrial Park’s advanced power grid demonstration project. These transformers ensured stable voltage regulation and harmonic suppression, supporting sensitive industrial loads like semiconductor manufacturing. By integrating with SVG systems, Junengda’s transformers enhanced grid reliability, achieving a 99.8% voltage qualification rate and meeting stringent energy quality standards for high-tech industries.

2.High-Altitude Renewable Integration in Sichuan, China

At the 4,500-meter-altitude Kola Solar-Wind Hybrid Plant, Junengda’s transformers overcame extreme environmental challenges. Designed with upgraded insulation and compact cooling systems, they efficiently handled voltage fluctuations caused by intermittent renewable generation. Their robust performance reduced transmission losses by 15%, enabling seamless integration of 120MW clean energy into the regional grid.

3.Urban Substation Modernization in Shenzhen, China

Shenzhen’s metro-area substations adopted Junengda’s 20kV oil-immersed transformers to address space constraints and fire safety concerns. Featuring flame-retardant insulation and a leak-proof tank design, these transformers minimized footprint while ensuring uninterrupted power supply for high-rise buildings and critical infrastructure. Their low maintenance requirements cut operational costs by 20% annually.

4.Rural Electrification in Northern Vietnam

Junengda transformers revolutionized rural electrification in Vietnam’s mountainous regions. Installed in decentralized grids, they delivered stable 20kV power to remote villages, overcoming voltage drops and harsh weather. Their adaptive cooling technology and corrosion-resistant materials extended service life by 30%, supporting agricultural automation and improving local livelihoods.

• Junengda 20kV three-phase Oil-Immersed Transformer   FAQ>>>

1. What is a 20kV Three-Phase Oil-Immersed Transformer?

A 20kV Three-Phase Oil-Immersed Transformer by Junengda is a high-efficiency power distribution device designed to step down electrical voltage from 20kV to 0.4kV (or other required levels) for industrial, commercial, and utility applications. It features a robust core made of premium cold-rolled silicon steel, high-strength copper/aluminum windings, and a corrosion-resistant oil-filled tank for optimal insulation, cooling, and durability. Ideal for harsh environments like power grids, factories, and renewable energy systems, Junengda’s transformers comply with IEC, GB, and ANSI standards, ensuring reliability and safety.

2. What are the key advantages of Junengda’s 20kV Oil-Immersed Transformers?

Junengda’s transformers are engineered for low losses, high overload capacity, and long service life. Key benefits include:

Energy Efficiency: Reduced no-load and load losses minimize operational costs.

Advanced Cooling: Oil immersion ensures stable thermal performance, even under 125% overload conditions.

Safety: Flame-retardant oil, pressure relief devices, and gas relays prevent explosions and leaks.

Customization: Tailored voltage ratios, tap changers (on/off-load), and materials (copper/aluminum) meet diverse project needs.

3. What technical specifications does Junengda’s 20kV transformer offer?

Capacity Range: 30kVA to 2500kVA.

Voltage: High voltage 20kV (±5% or ±2×2.5% tapping), low voltage 0.4kV.

Standards: Complies with GB/T 25289-2010, IEC 60076, and ISO 9001 certifications.

Design: Corrugated tank for thermal expansion, amorphous alloy cores (optional), and anti-corrosion coatings.

4. How does Junengdaensure transformer reliability and maintenance?

Junengda enhances operational reliability with smart monitoring (temperature sensors, RS485 interfaces) and proactive maintenance checks (oil levels, insulation, cooling efficiency). Advanced self-protection mechanisms (gas relays, pressure release valves) automatically isolate faults, minimizing downtime and strengthening grid resilience.

5. Where can Junengda’s 20kV transformers be applied?

These transformers are widely used in:

Power Distribution Networks: Substations, grid connections.

Industrial Zones: Factories, mining, and petrochemical plants.

Renewable Energy: Solar/wind farms, energy storage systems.

Urban Infrastructure: Airports, metro systems, and commercial complexes.

6. Does Junengdaprovide customization and global support?

Yes! Junengda offers OEM services, custom voltage configurations, and accessories like conservator tanks or protective coatings. With 20+ years of expertise, we export to South America, Southeast Asia, Africa, and beyond, ensuring timely delivery and technical support.

7. Why choose Junengdafor oil-immersed transformers?

Junengda combines cutting-edge R&D, rigorous quality control, and sustainable practices to deliver transformers that outperform in efficiency and durability. Our global certifications, competitive pricing, and 24/7 customer service make us a trusted partner for power solutions worldwid