3150kVA Three Phase Dry Type Power Transformer Custom Voltage Factory Direct
The 3150kVA Three Phase Dry Type Power Transformer Cast Resin Custom Voltage Factory Direct is a large-capacity, high-efficiency cast-resin dry-type power transformer designed for demanding indoor and semi-outdoor applications in heavy commercial, industrial, data center, renewable energy, mining, railway, and large-scale EV infrastructure projects. Fully compliant with IEC 60076-11, IEC 60076-1/2/3/5/20, EN 50588-1 (eco-design), IEEE C57.12.01, IEEE C57.12.91, UL 1561 (optional), and DOE 2016 efficiency standards, this 3150 kVA dry-type transformer achieves superior energy efficiency (typically 99.35–99.55% at full load), ultra-low no-load and load losses, strong overload capability (up to 150% short-term), low sound levels (<65 dB standard; <60 dB low-noise execution), and a design life exceeding 40 years.
- Primary Voltage Ratings Custom (commonly 6.6 kV, 10 kV, 11 kV, 13.8 kV, 20 kV, 22 kV, 33 kV, 35 kV)
- Secondary Voltage Ratings Custom (commonly 0.4 kV / 0.69 kV / 3.3 kV / 6.6 kV / 11 kV)
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Dry type transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA,IEC,GB
- Application data centers, semiconductor fabs, high-tech campuses
- Power Rating 7500kVA
- Certificate IEC 60076-11, IEC 60076-1, IEC 60076-3, UL 1561
- Cooling Method OA/OF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
3150kVA Three Phase Dry Type Power Transformer Custom Voltage Factory Direct
Technical Specifications
Accessories
| Rated Power | 3150 kVA | |
| Rating Primary Voltage | 2.4-35kV | |
| Secondary Voltage | 480/277V 400/230V 380/220V 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 | |
| Enclosure material | 304 Stainless Steel | |
|
Enclosure |
IP23 ventilated (indoor standard), IP54/IP55 totally enclosed (optional) |
|
|
Sound level |
<65 dB standard (low-noise fans & core clamping optional for <60 dB) |
|
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
3150kVA Three Phase Dry Type Power Transformer Custom Voltage Factory Direct
The 3150kVA Three Phase Dry Type Power Transformer Cast Resin offers extensive factory-direct customization to precisely match voltage, environmental, and performance requirements across demanding medium- and high-power installations. Primary voltages range from 6kV to 66kV (including common 10kV, 11kV, 22kV, 33kV, 35kV), with secondary voltages from 0.4kV to 11kV or custom values for direct equipment supply. Copper windings are standard for maximum conductivity and thermal endurance; aluminum options reduce weight and cost where applicable. Tap configurations include off-circuit ±2×2.5% to ±10% or advanced on-load tap changers (OLTC) with up to 17 steps for automatic regulation under fluctuating loads. Insulation class upgrades to Class H (180°C) and low-temperature-rise designs (80K/100K) support high ambient temperatures or continuous overload. Cooling enhancements feature forced air (AF) fans or ducted systems for 40-50% capacity increase, with enclosure protection from IP00 to IP54/IP55 for dust, water, or corrosive atmospheres.
Additional tailoring includes vector groups (Dyn11, YNd1, Dyn5, or custom) for harmonic mitigation and parallel operation, integrated fiber-optic temperature monitoring, partial discharge sensors, Modbus/Ethernet smart interfaces for predictive maintenance, electrostatic shielding, anti-vibration isolators reducing noise below 65dB, and special resin formulations for enhanced fire behavior or chemical resistance. Seismic qualification, marine-grade coatings, and oversized bushings for high-current applications further broaden applicability. These factory-direct customizations deliver optimal performance and cost efficiency, positioning the transformer as a leading option in searches for "custom high-capacity 3150kVA cast resin dry type transformers."
Packing and Shipping
3150kVA Three Phase Dry Type Power Transformer Custom Voltage Factory Direct
Packaging the substantial 3150kVA Three Phase Dry Type Power Transformer Cast Resin is engineered for maximum protection of the resin-encapsulated windings, core, and accessories during heavy-duty transport. The unit is rigidly secured to an extra-heavy reinforced wooden skid with multiple anti-vibration isolators, steel cross-bracing, and high-strength lifting trunnions. All terminals, bushings, sensors, and fragile components receive custom-molded foam cradles and rigid protective covers. The entire assembly is wrapped in thick multi-layer moisture-proof film, anti-static sheeting, and edge/corner reinforcements. A purpose-built, ISPM 15-compliant heavy-duty wooden crate or open steel frame fully encloses the transformer, incorporating internal supports, active desiccant systems, humidity indicator cards, and multi-axis electronic shock & tilt recorders to document handling and preserve dry-type integrity.
Global shipping is tailored for this large-capacity cast resin unit, balancing safety, cost, and schedule. Ocean freight in dedicated 40ft open-top or flat-rack containers with custom cradles and certified multi-point lashing provides secure, economical delivery (typically 30-70 days to international ports). Air charter services expedite critical components or urgent replacements in 7-18 days. Overland transport uses specialized low-loader trailers with hydraulic suspension, police escorts, and pre-approved heavy-haul routes for domestic/regional movements.
Comprehensive export documentation—including commercial invoices, detailed dimensional/weight manifests, origin certificates, test reports, and IEC compliance declarations—is prepared in advance for rapid customs clearance. Sustainable logistics practices incorporate reusable skids, optimized container loading, and carbon-offset options where available. Clients benefit from a secure tracking portal with real-time satellite positioning, ETA forecasts, and direct logistics engineer support.
Post-arrival services include optional heavy-lift crane or SPMT offloading coordination, immediate condition assessment, insulation verification, and packaging recycling/disposal to accelerate commissioning. Multi-unit factory-direct orders leverage consolidated shipments and phased delivery scheduling. This end-to-end heavy-equipment logistics ensures the 3150kVA transformer arrives pristine and ready for installation, dominating searches for "factory direct large dry type transformer shipping."
Global shipping is tailored for this large-capacity cast resin unit, balancing safety, cost, and schedule. Ocean freight in dedicated 40ft open-top or flat-rack containers with custom cradles and certified multi-point lashing provides secure, economical delivery (typically 30-70 days to international ports). Air charter services expedite critical components or urgent replacements in 7-18 days. Overland transport uses specialized low-loader trailers with hydraulic suspension, police escorts, and pre-approved heavy-haul routes for domestic/regional movements.
Comprehensive export documentation—including commercial invoices, detailed dimensional/weight manifests, origin certificates, test reports, and IEC compliance declarations—is prepared in advance for rapid customs clearance. Sustainable logistics practices incorporate reusable skids, optimized container loading, and carbon-offset options where available. Clients benefit from a secure tracking portal with real-time satellite positioning, ETA forecasts, and direct logistics engineer support.
Post-arrival services include optional heavy-lift crane or SPMT offloading coordination, immediate condition assessment, insulation verification, and packaging recycling/disposal to accelerate commissioning. Multi-unit factory-direct orders leverage consolidated shipments and phased delivery scheduling. This end-to-end heavy-equipment logistics ensures the 3150kVA transformer arrives pristine and ready for installation, dominating searches for "factory direct large dry type transformer shipping."
32
32 years of industry experience
Manufacturer Test
3150kVA Three Phase Dry Type Power Transformer Custom Voltage Factory Direct
Progress Test
Early manufacturing stages for the 3150kVA three-phase cast resin dry type transformer focus on core validation through detailed Epstein frame and flux density testing of premium grain-oriented silicon steel to guarantee ultra-low no-load losses. Copper winding production employs precision automated layering with continuous inter-turn surge and high-potential testing for insulation uniformity. Pre-casting conductor and spacer alignment is verified via 3D laser scanning for accurate duct placement. Vacuum pressure impregnation cycles are monitored with real-time resin flow sensors and ultrasonic void detection. Core-coil preliminary assembly includes low-voltage excitation for magnetization curve, harmonic content, and magnetic balance profiling. These incremental validations, supported by fully serialized digital traceability, establish the foundation for high-efficiency and reliable performance. Advanced progress evaluations feature controlled resin casting with multi-zone temperature monitoring, post-cure hardness testing, and thermal expansion verification. Partial discharge pre-screening during stepped voltage ramps confirms levels well below acceptance thresholds. Cooling duct airflow resistance and uniformity are assessed through pressure drop and flow visualization tests. Vibration modal analysis on the assembled core-coil structure identifies natural frequencies for damping optimization.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ Insulation Power Factor
♦ 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)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
Transformer Factory Acceptance Test
Factory Acceptance Testing for the 3150kVA three-phase cast resin dry type transformer commences with high-precision ratio and polarity verification across all taps using dual-reference ratiometric equipment, achieving accuracy within 0.15%. No-load loss, excitation current, and harmonic spectra are exhaustively measured at 90-110% rated voltage to confirm superior core efficiency and compliance with energy standards. Winding resistance is recorded at controlled temperatures and corrected for accurate load loss segregation and thermal modeling. Routine dielectric tests include applied power-frequency withstand at full specified levels, insulation resistance far exceeding minimums, and dissipation factor below 0.3%. Partial discharge measurement under induced overvoltage restricts levels to stringent low pC values. Oil-free design verification confirms encapsulation integrity. These foundational electrical tests, executed under calibrated conditions with optional witness participation, provide irrefutable baseline certification per IEC 60076-11. Sophisticated FAT continuation incorporates double-frequency induced overvoltage with ultra-sensitive partial discharge, RIV, and acoustic emission monitoring, maintaining discharge well below 10pC across the voltage range.
Routine Test - Induced Voltage
Purpose of Testing
The purpose of winding resistance testing is to detect the continuity and connection quality of the internal conductors of the motor or transformer windings, and to promptly detect potential faults such as open circuits, poor contact or local heating.
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.
Test standard
IEEE C57.12.01 & IEEE C57.12.91 (Dry-Type)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Extensively deployed across large commercial complexes, mixed-use urban developments, and utility indoor substations, delivering efficient, fire-safe, high-power distribution for integrated industrial, commercial, and critical infrastructure operations.
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
31500kVA 35kV Oil-Immersed Copper Transformer For Substation
The 31500kVA 35kV Oil-Immersed Copper Transformer is engineered for high-capacity, stable, and efficient power distribution across industrial plants, substations, and utility networks. Built with a high-purity copper winding structure, the transformer ensures superior conductivity, reduced losses, and long-term reliability under continuous heavy-load operation. Its oil-immersed insulation system provides excellent thermal performance, enabling stable operation even in demanding outdoor environments. The robust 35kV design enhances voltage regulation, short-circuit resistance, and overall safety. Advanced manufacturing standards, precision coil winding, and strict quality control ensure exceptional dielectric strength and mechanical durability.
50kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
50kVA Completely self-protected(CSP) Single Phase pole Mounted transformer is a robust, high-efficiency solution designed for reliable single-phase power distribution in residential, commercial, and small industrial applications. This transformer features built-in protection mechanisms, including overload, short-circuit, and over-voltage safeguards, ensuring automatic disconnection during fault conditions to protect both the transformer and the electrical system. With its pole-mounted design, it is space-efficient and ideal for installations in urban, rural, and remote areas. The transformer operates with low losses, ensuring high energy efficiency and long-term performance. Built with durable materials, it offers exceptional resilience against harsh weather conditions, ensuring reliability and longevity. This transformer is an ideal choice for any application requiring consistent, stable single-phase power.
3150kVA Oil Immersed Transformer
3150kVA Oil Immersed Transformer is a high-capacity three-phase power transformer optimized for efficient voltage transformation in 50/60Hz AC medium-voltage networks, with primary ratings commonly at 11kV, 22kV, 33kV, or 35kV (adaptable to 10–38.5kV) and secondary at 0.4kV, 0.69kV, 6.3kV, 10kV, or 11kV. Employing advanced high-permeability grain-oriented silicon steel core (S13/S20 series compliant) for dramatically reduced no-load losses (typically 3200–5400W), high-purity copper windings, and premium insulating oil (IEC 60296 compliant, dielectric >60kV/2.5mm), it achieves low load losses (around 18–22kW at 75°C), strong overload capability (up to 150–180% short-duration), noise below 65dB, and efficiency exceeding 99%.This transformer minimizes operational expenses, transmission losses, and environmental impact in large-scale industrial, utility, and renewable setups.
500kVA Dry Type Transformer
NPC ELECTRIC 500kVA Dry-Type Transformer offers reliable and efficient power distribution with a compact, oil-free design. It ensures safe, low-maintenance operation with advanced insulation and cooling systems, making it ideal for industrial and commercial use. With a capacity of 500kVA, it delivers stable performance while being environmentally friendly and cost-effective. Key characteristics feature three-phase design (single-phase adaptable), primary voltages 208V–600V (e.g., 480V Delta, 600V Delta), secondary voltages such as 208Y/120V, 480Y/277V, or custom, aluminum or copper windings, 150°C rise (standard) or 115°C/80°C with 220°C insulation class, ±2×2.5% primary taps, NEMA 1 ventilated enclosure (NEMA 3R/encapsulated options), natural convection cooling (AN), electrostatic shielding, and low sound levels per NEMA.
167kVA Single Phase Pad Mounted Transformer
The 167kVA single phase pad mounted transformer is engineered for higher-capacity underground residential and light commercial distribution, efficiently transforming primary voltages such as 12470GrdY/7200, 24940GrdY/14400, 34500GrdY/19920, or dual-voltage configurations to secondary 120/240V split-phase or 240V outputs. Constructed with premium grain-oriented silicon steel cores and aluminum or copper windings, it delivers exceptional energy efficiency and minimal losses while fully complying with DOE 2016 standards and IEEE/ANSI C57.12.34 specifications.
10.5KV Oil Immersed Substation Transformer
The 10.5kV Oil Immersed Substation Transformer is specifically designed for medium-voltage power substations requiring stable voltage conversion and reliable long-term operation. Utilizing a proven oil-immersed insulation system, the transformer provides excellent dielectric strength and efficient heat dissipation, ensuring dependable performance under continuous load conditions. High-quality winding materials and precise manufacturing processes enhance mechanical strength and short-circuit resistance. With low operating noise and strong thermal stability, the transformer is well-suited for modern substations serving industrial, commercial, and infrastructure power distribution systems.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