350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer
Elevate your power distribution system with the advanced 350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer, expertly crafted for optimal performance and energy savings in modern electrical infrastructures. This three-phase transformer employs cutting-edge amorphous metal cores and high-conductivity copper windings to significantly reduce core losses and achieve outstanding efficiency levels exceeding 98.5%. The fully sealed oil-immersed design with superior PCB-free mineral oil provides exceptional insulation, natural cooling, and resistance to overloads, ensuring stable operation in varied conditions. Equipped with low-noise technology and a durable corrugated tank for enhanced heat dissipation, it offers quiet performance and extended lifespan over 30 years. Meeting stringent standards such as IEC 60076 and EN 50588-1 for eco-friendly operation, this 350kVA transformer delivers reliable voltage transformation, minimizes downtime, and contributes to lower electricity costs for commercial and residential networks.
- Primary Voltage Ratings 10kV, 46kV or others
- Secondary Voltage Ratings 0.4kV 6kV 10kV or others
- H.V. Tap Range ±8×1.25% or others
- Type power transformer
- BIL 10kV 0.4kV
- Standards IEEE, ANSI, NEMA, IEC, CE
- Application mining operations, oil & gas facilities
- Power Rating 350kVA
- Certificate UL, CESI, IEEE
- Cooling Method ONAN/ONAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer
Technical Specifications
Accessories
| Rated Power | 350kVA | |
| Rating Primary Voltage | 10kV 0.4kV | |
| Secondary Voltage |
6.6kV 10kV 13.8kV Customized |
|
| Frequency | 50/60Hz | |
| Vector Group | Dyn11, Yyn0, Dyn5 | |
| Winding Material | Aluminum/Copper | |
| Efficiency | As IEEE, Doe 2016, CAS Std or Customized | |
| Impedance Voltage | Nominal 2% or Customized 1.1 - 5.75% | |
| Altitude | ≤1,000m or Customized | |
| Color | ANSI 70 Light gray/Munsell 7GY3.29/1.5 or customized, etc | |
| Tank material | Mild Steel, 304 Stainless Steel | |
| HV Bushing |
| LV Bushing |
| Tap changer |
| Oil level gauge |
| Oil temperature indicator |
| Pressure relief device |
| Pressure vacuum gauge |
| Lifting hook for complete transformer |
| Name plate |
| Radiators |
| Oil upper filtering valve |
| Oil drain valve with 3/8" sampler |
Customization Optional
350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer
The 350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer supports extensive customization to adapt seamlessly to unique installation requirements and enhance system efficiency. Users can opt for amorphous or traditional silicon steel cores to prioritize ultra-low no-load losses or cost balance, paired with copper or aluminum windings for optimal thermal and electrical performance. Tap changer options range from off-circuit (±4×2.5%) for basic regulation to on-load variants enabling automatic voltage control in fluctuating networks. Cooling enhancements include KNAN (natural ester oil) for fire safety and biodegradability, or additional radiators for higher ambient temperatures up to 50°C. Protection upgrades feature gas-actuated relays, oil level gauges with alarms, and digital thermometers for proactive monitoring, facilitating integration into IoT-enabled substations and remote diagnostics.
Personalization extends to enclosure styles, such as hermetically sealed for zero maintenance in humid or dusty locations, or a conservator with a breather for standard setups. Vector groups (Dyn5, Dyn11, or others) ensure compatibility with existing grids and reduce harmonics from nonlinear loads. Accessories like plug-in bushings, earthing terminals, surge protection devices, and custom RAL color coatings allow full aesthetic and functional alignment. Low-noise kits with elastic supports drop sound levels below 50dB for sensitive areas. Seismic and high-altitude adaptations further broaden applicability. These tailored features position the transformer as a premium, searchable choice for "custom high-efficiency 350kVA oil-immersed distribution transformers."
Packing and Shipping
350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer
Protecting the integrity of the 350kVA 10kV/0.4kV transformer during transit starts with specialized packaging that safeguards against shocks, vibrations, and weather exposure. The unit is anchored to a reinforced pallet base with anti-slip brackets, then wrapped in multi-layer anti-corrosion film and moisture-barrier foil. Delicate parts like bushings and gauges receive individual foam cradles and hardwood caps for extra security. The entire assembly is housed in a heat-treated export wooden case meeting IPPC-ISPM 15 regulations, complete with internal silica gel desiccants and humidity indicators. External impact recorders and GPS-enabled seals monitor handling in real time, providing evidence for insurance and quality assurance in high-efficiency transformer deliveries.
Flexible shipping arrangements ensure the timely and secure arrival of this three-phase oil-immersed transformer worldwide. Sea transport via 20ft or 40ft containers offers economical rates for bulk or single units, with professional lashing and ventilation to maintain oil stability, delivering in 20-45 days to most ports. Air freight accelerates urgent orders to 4-8 days, ideal for project deadlines. Land routes employ flatbed trucks with hydraulic lifting for safe loading/unloading, adhering to oversize permit guidelines. All options include door-to-door service and full-value cargo insurance, minimizing risks associated with "oil-immersed power transformer international shipping."
Export documentation is meticulously prepared, encompassing fumigation certificates, detailed weight/volume specs, and hazardous goods notifications for insulating oil compliance. Sustainable elements like recyclable crate components and carbon-offset routing align with green logistics trends. Clients access an online portal for live shipment tracking, ETA alerts, and direct coordinator support from dispatch to destination. Final delivery support includes optional crane-assisted offloading, pre-installation oil sampling, and packaging waste disposal to expedite commissioning. For multiple units, synchronized phasing reduces on-site storage. This holistic packing and shipping process guarantees your 350kVA transformer arrives pristine, boosting confidence in searches for "safe and efficient distribution transformer logistics."
Flexible shipping arrangements ensure the timely and secure arrival of this three-phase oil-immersed transformer worldwide. Sea transport via 20ft or 40ft containers offers economical rates for bulk or single units, with professional lashing and ventilation to maintain oil stability, delivering in 20-45 days to most ports. Air freight accelerates urgent orders to 4-8 days, ideal for project deadlines. Land routes employ flatbed trucks with hydraulic lifting for safe loading/unloading, adhering to oversize permit guidelines. All options include door-to-door service and full-value cargo insurance, minimizing risks associated with "oil-immersed power transformer international shipping."
Export documentation is meticulously prepared, encompassing fumigation certificates, detailed weight/volume specs, and hazardous goods notifications for insulating oil compliance. Sustainable elements like recyclable crate components and carbon-offset routing align with green logistics trends. Clients access an online portal for live shipment tracking, ETA alerts, and direct coordinator support from dispatch to destination. Final delivery support includes optional crane-assisted offloading, pre-installation oil sampling, and packaging waste disposal to expedite commissioning. For multiple units, synchronized phasing reduces on-site storage. This holistic packing and shipping process guarantees your 350kVA transformer arrives pristine, boosting confidence in searches for "safe and efficient distribution transformer logistics."
32
32 years of industry experience
Manufacturer Test
350kVA 10kV/0.4kV Three Phase Oil Immersed Power Distribution Transformer
Progress Test
Early manufacturing stages for the 350kVA 10kV/0.4kV transformer involve core lamination checks using laser interferometry to verify flatness and low-loss amorphous material properties under induced flux. Winding layer insulation is tested via surge comparison for turn-to-turn uniformity, achieving breakdown thresholds over 3kV. Tank seam welds undergo vacuum helium spray testing for absolute leak-proofing. Initial core-coil assembly includes capacitance mapping and tan-delta measurements to predict long-term dielectric health. These phased inspections ensure foundational quality for high-efficiency performance.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Leak Test
♦ DC Insulation Resistance Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Transformer Factory Acceptance Test
Further FAT includes an induced overvoltage test with partial discharge monitoring limited to 5pC, assessing winding integrity. Heat run trial at rated power tracks oil and winding temperature rises via embedded sensors, staying below 55K/60K. Noise level assessment in a controlled environment verifies under 52dB operation. Accessory functionality checks the cycle tap changers 500 times and activates the protection devices. Final magnetic circuit balance and zero-phase sequence tests conclude the protocol, certifying superior quality and reliability.
Routine Test - Induced Voltage
Purpose of Testing
The purpose of the Induced Voltage test is to simulate the electrical stress that the equipment may encounter under actual working conditions by applying an induced voltage, thereby evaluating the tolerance and stability of the equipment's insulation system. This test helps to detect the insulation performance of the equipment under high voltage conditions and ensure its safety and reliability in operation.
Testing Equipment
Induced Voltage Tester (e.g. OMICRON, Megger, HioKI, etc.)
AC voltage source, commonly 2 kV, 5 kV, 10 kV, or customized according to test requirements.
Environmental thermometer and hygrometer, used to record the temperature and humidity of the environment for appropriate test evaluation.
AC voltage source, commonly 2 kV, 5 kV, 10 kV, or customized according to test requirements.
Environmental thermometer and hygrometer, used to record the temperature and humidity of the environment for appropriate test evaluation.
Pre-Test Preparation
Disconnect all relevant power supplies and ensure that the equipment is properly grounded and discharged.
Check the connection wires and terminals to ensure they are secure and free of contamination.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Check the connection wires and terminals to ensure they are secure and free of contamination.
Test under suitable environmental conditions: relative humidity below 75%, no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the appropriate terminals or bushings of the device under test, ensuring that the connections are secure and properly grounded.
Apply Test Voltage:
Select the appropriate induction voltage according to the rated voltage and standard of the equipment.
Connect the test equipment to the appropriate terminals or bushings of the device under test, ensuring that the connections are secure and properly grounded.
Apply Test Voltage:
Select the appropriate induction voltage according to the rated voltage and standard of the equipment.
Measure and Record
Start the test and record the following parameters:
Induced Voltage
Applied Current
Voltage peak, stability and waveform (waveform analysis)
Any abnormal current or voltage changes during the measurement process.
Induced Voltage
Applied Current
Voltage peak, stability and waveform (waveform analysis)
Any abnormal current or voltage changes during the measurement process.
Temperature Correction
The measured induced voltage data is corrected to the reference temperature (usually 20°C) to ensure the accuracy of the test results.
Repeat Testing (if necessary)
If necessary, test different windings (HV, MV, LV) and bushings separately and compare the results at different test points.
Evaluation Criteria (Reference)
Inductive voltage ≤ 1% (Excellent): normally and meets safety standards.
1% < Inductive voltage ≤ 3% (Good): still within acceptable range.
Inductive voltage > 3% : faulty or not meet safety requirements and requires further analysis and repair.
1% < Inductive voltage ≤ 3% (Good): still within acceptable range.
Inductive voltage > 3% : faulty or not meet safety requirements and requires further analysis and repair.
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Perfect for small commercial buildings and office parks, this 350kVA transformer provides a dependable low-voltage supply for lighting, air conditioning, and IT infrastructure.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Transformers Packaging (1)
Transformers Packaging (2)
Transformers Packaging (3)
Transformers Packaging (4)
Transformers Packaging (5)
Transformers Packaging (6)
Transformers Packaging (7)
Transformers Packaging (8)
Related Products
2000kVA Oil Immersed Transformer
NPC ELECTRIC's 2000kVA oil-immersed transformer uses advanced oil-immersed cooling technology, has excellent heat dissipation performance and high efficiency, and is suitable for various power systems. The transformer complies with international IEC standards and ISO quality management system certification to ensure product reliability and stability. Its design meets environmental protection requirements, has low noise and low vibration, and is widely used in industrial, commercial, and power transmission and distribution systems.
11kV Three-Phase Oil-Immersed Power Transformer
The 11kV Three-Phase Oil-Immersed Power Transformer is engineered for stable and efficient distribution across medium-voltage networks. Designed with high-grade silicon steel, advanced insulation systems, and premium mineral oil, this transformer ensures superior dielectric strength, excellent heat dissipation, and long service life. Its oil-immersed configuration delivers reliable cooling performance, enabling continuous operation under varying load conditions. The three-phase design ensures balanced power delivery, reduced energy losses, and improved grid stability. With enhanced short-circuit strength, low noise levels, and robust mechanical structure, it is suitable for industrial facilities, commercial complexes, substations, and utility distribution networks. Custom voltage ratios, tap changers, protection devices, and enclosure options are available to meet regional standards and project-specific requirements.
11kV 1500kVA Zigzag Wiring Earthing Transformer with NGR High Impedance
11kV 1500kVA Zigzag Wiring Earthing Transformer with NGR (High Impedance) is designed to provide a reliable artificial neutral point for medium-voltage power systems where controlled earth fault current is required. Utilizing a zigzag winding configuration, the transformer offers low zero-sequence impedance while maintaining balanced operation during normal conditions. The integrated high-impedance Neutral Grounding Resistor (NGR) effectively limits ground fault current, reducing thermal and mechanical stress on network equipment. This transformer is engineered for stable performance, high fault withstand capability, and long operational life. The robust insulation system and reinforced windings ensure safe operation under fault conditions, while the optimized core design minimizes losses.
3000kVA Dry Type Transformer
3000kVA Dry Type Transformer is a high-performance, reliable power solution designed to meet the needs of large industrial and commercial facilities. With a 3000kVA capacity, it utilizes advanced dry-type insulation, ensuring exceptional safety, minimal maintenance, and extended durability. Built for demanding environments, this transformer provides stable, efficient, and low-noise operation while minimizing environmental impact. The NPC ELECTRIC 3000kVA Dry Type Transformer is the ideal choice for ensuring reliable and efficient power distribution in large-scale applications.
75kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
NPC ELECTRIC, the production of a 75kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer is a high-efficiency, reliable solution for single-phase power distribution in residential, commercial, and small industrial applications. Equipped with built-in protection features such as overload, short-circuit, and over-voltage protection, it ensures automatic disconnection during fault conditions to prevent damage to the system. Its pole-mounted design saves space and is ideal for installation in both urban and rural environments. The transformer operates with minimal energy loss, ensuring high efficiency and long-term performance, while its durable construction makes it resistant to harsh weather conditions, ensuring a reliable and safe power supply over time.
1000kVA Dry Type Transformer
NPC ELECTRIC 1000kVA Dry-Type Transformer offers efficient, oil-free power distribution with a compact design. Equipped with advanced insulation and cooling systems, it ensures safe and reliable operation with minimal maintenance. Ideal for industrial and commercial applications, it provides environmentally friendly and cost-effective performance.FAQ From Customers
-
What is a Transformer?A transformer is an electrical device used to change the voltage of alternating current (AC). It works on the principle of electromagnetic induction, converting high-voltage current into low-voltage current or low-voltage current into high-voltage current. Transformers are widely used in power transmission, distribution systems, and various electronic devices.
-
What are the main uses of a transformer?The main use of a transformer is voltage conversion. Transformers are used in power transmission systems to help transfer electricity from power plants to consumers. In addition, transformers are also used in electronic devices such as chargers, televisions, power adapters, etc., to adjust the voltage to meet the requirements of different devices.
-
Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
Welcome your inquiry
Honesty, Integrity, Frugality, Activeness and Passion