35 KV Three-phase Oil-immersed Power Distribution Transformer

• Junengda 35 KV  Oil-immersed  Transformer  Overview>>>

Junengda’s 35 KV three-phase oil-immersed transformer delivers exceptional efficiency and robustness for utility and industrial grids, engineered to withstand voltage fluctuations and harsh environments.With capacities ranging from 10kVA to 5000kVA, this transformer notably features advanced insulation and low-loss designs. As a result, it significantly reduces operational costs while enhancing grid stability across diverse applications.

• Junengda 35 KV  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)
50	35	± 2×2.5% ±5	0.4	Dyn11 Yyn0	160	1200/1140	1.30	6.5
100					230	2010/1910	1.10
125					270	2370/2680	1.10
160					280	2820/2680	1.00
200					340	3320/3160	1.00
250					400	3950/3760	0.95
315					480	4750/4530	0.95
400					580	5740/5470	0.85
500					680	6910/6580	0.85
630					830	7860	0.65
800					980	9400	0.65
1000					1150	1150	0.65
1250					1400	1390	0.60
1600					1690	1660	0.60
2000					1990	1970	0.55
2500					2360	2320	0.55

• Junengda 35 KV  Oil-immersed  Transformer  Features>>>

Standards & Certifications

Compliant with IEC, GB, and Global Energy Efficiency Directives.Junengda’s transformer meets IEC 726, GB/T 6451, and GB 20052-2020 standards, ensuring minimal losses (≤30% lower than conventional models) and non-flammable ester-oil options with FM/UL certification.

Target Markets

This 35kV three-phase oil-immersed transformer is extensively deployed in Southeast Asia, Africa, and South America, supporting grid upgrades and renewable energy integration in regions requiring robust, cost-effective solutions.

Application ScenariosI

deal for wind/solar farms (up to 35kV collection systems), underground substations, and urban networks, its compact design adapts to space-constrained sites while withstanding voltage fluctuations.Building on versatility, it excels in high-risk environments like mines and ports with C4-grade corrosion resistance and seismic stability.

Structural Materials

Featuring amorphous alloy cores (losses ≤0.90 W/kg) and cold-rolled grain-oriented steel, this oil-immersed transformer reduces energy waste by 15–30%.Transitioning to safety, the fully sealed tank or conservator system prevents leaks, while optional ester oil (flash point >300°C) enhances fire safety in densely populated areas.

Smart System Integration

Real-Time Monitoring and IoT Compatibility.Integrated sensors enable remote load management via Modbus/RS-485 protocols, supporting “four remote” functions (remote measurement, signaling, control, adjustment) for predictive maintenance.

• Junengda 35 KV  Oil-immersed  Transformer advantage>>>

High Safety

To ensure top-tier protection, Junengda’s 35kV oil-immersed transformer incorporates a fully sealed tank or conservator system, thereby eliminating oil leakage risks. Additionally, we offer optional ester oil (flash point >300°C) with FM/UL non-flammable certification, which ensures fire safety in densely populated areas or high-risk sites like mines and ports.

Operational Stability

Engineered to thrive in extreme conditions, this three-phase oil-immersed transformer offers C4-grade corrosion resistance and seismic stability. Consequently, it maintains precise voltage regulation even within renewable grids characterized by high variability (e.g., 35kV wind/solar farms)²³. Moreover, its amorphous alloy core and cold-rolled steel construction minimize energy losses to ≤0.90 W/kg, thereby enhancing grid inertia during frequency deviations and ensuring continuous, reliable operation.

Low Maintenance Costs

By reducing hotspot temperatures and using durable cellulose insulation, we extend the service longevity of the transformer. Meanwhile, integrated IoT sensors enable predictive maintenance via “four remote” functions (remote measurement, signaling, control, adjustment), which helps to cut downtime and manual checks.

High Space Efficiency

Ideal for space-constrained deployments like urban substations or underground sites, this 35kV three-phase oil-immersed transformer’s modular design supports flexible cooling configurations (natural/forced air, oil circulation) without compromising 5,000kVA capacity.

Eco-Friendly Performance

Aligned with GB 20052-2020 and IEC efficiency directives, Junengda’s transformer uses recyclable ester oil and reduces CO₂ emissions by 15–30% through ultra-low no-load losses (≤30% lower than conventional models).

Energy Efficiency Leadership

Optimized electromagnetic design and low-waste materials slash operational costs by 30%, exceeding IEC 726 and GB/T 6451 standards for peak performance in utility and industrial networks.

 

why choose Junengda?

Choose Junengda’s 35kV Three-Phase Oil-Immersed Transformer for unmatched safety, 30% higher energy efficiency, and ultra-reliable performance in demanding grid environments.

 

• Junengda 35 KV  Oil-immersed  Transformer Case>>>

1. Chinese Manufacturing Plant Upgrade

Junengda’s 35kV oil-immersed transformer enabled stable power expansion for an Eastern Chinese machinery factory, replacing aging units to support 27 MVA capacity and 10kV distribution, cutting downtime by 40% through enhanced voltage regulation  and overload resilience .

2. Wind-Solar Hybrid Farm Integration

When transitioning to renewable energy, we deployed this three-phase oil-immersed transformer in a 200 MW Central China hybrid farm. It efficiently collects 35kV wind/solar output while resisting salt corrosion and voltage fluctuations to ensure grid stability.

3.Southeast Asian Industrial Park

Junengda’s transformer powers a Thai auto-parts zone, where its compact design and C4-grade anti-corrosion withstood tropical humidity, enabling 5,000 kVA capacity in limited space without forced cooling.

4. Latin American Mining Operation

For critical resource extraction, this 35kV three-phase oil-immersed transformer delivered seismic stability and FM-certified fire safety in a Peruvian copper mine, sustaining 35kV hauling systems amid dust/vibration via ester-oil insulation and remote IoT monitoring.

• Junengda  35kV Three-Phase Oil-Immersed Transformer FAQ

1. What is a 35kV Three-Phase Oil-Immersed Transformer?

Engineers design the 35kV three-phase oil-immersed transformer as a power distribution device to step up or step down voltages in electrical grids.It operates at 35kV voltage levels, uses mineral oil for insulation and cooling, and is ideal for medium-to-high voltage applications such as substations, industrial plants, and renewable energy systems. These transformers comply with international standards like IEC and GB, ensuring reliability and safety.

2. Where are 35kV Oil-Immersed Transformers Typically Used?

They are widely deployed in power transmission networks, mining facilities, wind/solar farms, and large-scale industrial complexes. Their robust design supports continuous operation under harsh conditions, including high humidity and temperature fluctuations.

3. What Safety Features Does the Transformer Include?

Junengda transformers integrate gas relays, pressure relief devices, and temperature monitoring systems. The gas relay triggers alarms during internal faults, while the pressure release mechanism prevents tank rupture. Additionally, oil conservators and silica gel breathers maintain oil quality and insulation performance.

4. How Efficient and Durable Are These Transformers?

With advanced core materials and optimized winding designs, our transformers minimize no-load and load losses, achieving over 99% efficiency. The oil-immersed structure ensures long-term durability, with a service life exceeding 25 years under proper maintenance.

5. What Maintenance is Required?

Regular checks include oil level inspection, temperature monitoring (max 55°C rise above ambient), and annual dielectric strength tests. For extended outages, ensure monthly brief operation to preserve insulation integrity. Always follow local safety protocols during maintenance.

6. Can the Transformer Be Customized?

Yes! Junengda offers flexible configurations, including on-load/off-load tap changers, corrosion-resistant coatings, and accessories like surge arrestors or protective relays. Custom voltage ratios and capacity ranges are available to meet specific project needs.

7. Why Choose Junengda35kV Transformers?

Our transformers combine cutting-edge technology, rigorous quality control, and global certifications. They deliver stable performance in diverse environments, reduce energy waste, and comply with eco-friendly regulations. Partner with us for reliable power solutions tailored to your grid demands.