Solar Step-up Transformer
NPC ELECTRIC specializes in the design and production of high-performance Solar Step-up Transformers for photovoltaic (PV) applications, offering a wide range of transformer types to meet diverse installation and operational needs. Our product portfolio includes Dry Type Transformers for indoor or fire-sensitive environments, Pad Mounted Transformers for compact and secure outdoor use, Oil-Immersed Transformers known for their reliability and thermal performance, and Prefabricated Substation Transformers that integrate seamlessly into modular substation systems. Each solution is engineered to support efficient voltage step-up from inverter output to medium voltage grid levels, ensuring safe and stable energy transmission. In addition to standard models, NPC ELECTRIC provides customized solutions, including dual-split (Double-Split Winding) transformer designs that are particularly advantageous for high-capacity systems, difficult logistics, or site limitations, enabling easier transport and installation without compromising performance. Our transformers are compatible with both centralized and string inverter configurations and are manufactured to comply with international standards such as IEC, ANSI, and IEEE. Backed by advanced manufacturing capabilities and strict quality control.
- Primary Voltage Ratings 220/132/138/46/34.5/33/24/12kV or others
- Secondary Voltage Ratings 800V, 600V, 480V, 400V, 380V, 34.5, 33,24, 12kV or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Solar Step-up Transformer
- BIL 30/200kV, 30/170kV, 30/150, 30/95 or others
- Standards IEEE, ANSI, NEMA, IEC, GB
- Application Solar Farm,Substation,Grid-connected System etc
- Power Rating Customized
- Certificate UL ,CESI
- Cooling Method ONAN, KNAN
- Oil Mineral Oil or FR3
- Opeartion Step-up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
Solar Step-up Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | Customized | |
| Rating Primary Voltage | 6-220kV | |
| Secondary Voltage | Customized | |
| Frequency | 50/60Hz | |
| Vector Group | Dyn11,Ynd11,Dyn11yn11,YNd11d11 | |
| Winding Material | Aluminum/Copper | |
| Zero-Sequence Impedance | Customized | |
| 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 |
| CT |
| Lifting hook for complete transformer |
| Name plate |
| Radiators |
| Oil upper filtering valve |
| Oil drain valve with 3/8" sampler |
| Terminal box |
Customization Optional
Solar Step-up Transformer
Solar power transformers used in photovoltaic (PV) systems can be equipped with various optional features to meet site-specific, environmental, and operational requirements. NPC ELECTRIC offers a wide range of configurable options such as low voltage cable boxes or bus duct interfaces, porcelain or polymer high-voltage bushings with customizable installation angles, integrated current and voltage transformers for protection and measurement, oil temperature indicators, winding thermometers, pressure relief devices, Buchholz relays, off-circuit or on-load tap changers, surge arresters, grounding terminals, and earthing switches. Additionally, we offer double-split winding transformer designs. This design improves heat dissipation, reduces losses，short current and enhances parallel operation capabilities—ideal for large-capacity PV plants with uneven load distribution or redundancy requirements.
We also provide modular or split-winding transformer structures to facilitate transport and on-site assembly, as well as specialized anti-corrosion paint systems suitable for desert, coastal, or industrial environments. These options enhance the transformer’s adaptability, reliability, and safety, ensuring long-term stable operation in various PV power applications
Packing and Shipping
Solar Step-up Transformer
NPC ELECTRIC Solar power transformers are designed to be securely packaged for sea freight transport, ensuring safe delivery across long distances. For this purpose, the Packing and Shipping process for Solar power transformers is designed to ensure safe delivery to the customer, minimizing the risk of damage during transit.
The transformer is securely packed in a robust, weather-resistant wooden crate or steel container, with appropriate cushioning materials like foam or bubble wrap to absorb any shocks or impacts during transport.
The packing is carefully designed to protect the transformer from moisture, dust, and other environmental factors that could potentially affect its functionality.
For shipping, the transformer is typically delivered via road, rail, or sea, depending on the destination. It is properly secured to the shipping platform or pallet using straps or tie-downs to prevent any movement during transit. The packaging is clearly labeled with handling instructions and safety warnings to ensure that all involved parties handle the equipment with care.
Shipping documentation, including customs clearance forms, certificates of origin, and any necessary permits, are included to comply with international shipping standards. Upon arrival, the transformer is inspected for any potential damage before installation. This thorough packing and shipping process ensures that the Grounding Transformer reaches its destination in optimal condition, ready for installation and long-term operation.
The transformer is securely packed in a robust, weather-resistant wooden crate or steel container, with appropriate cushioning materials like foam or bubble wrap to absorb any shocks or impacts during transport.
The packing is carefully designed to protect the transformer from moisture, dust, and other environmental factors that could potentially affect its functionality.
For shipping, the transformer is typically delivered via road, rail, or sea, depending on the destination. It is properly secured to the shipping platform or pallet using straps or tie-downs to prevent any movement during transit. The packaging is clearly labeled with handling instructions and safety warnings to ensure that all involved parties handle the equipment with care.
Shipping documentation, including customs clearance forms, certificates of origin, and any necessary permits, are included to comply with international shipping standards. Upon arrival, the transformer is inspected for any potential damage before installation. This thorough packing and shipping process ensures that the Grounding Transformer reaches its destination in optimal condition, ready for installation and long-term operation.
32
32 years of industry experience
Manufacturer Test
Solar Step-up Transformer
Progress Test
NPC Electirc manufacture Solar power transformers have the strict quality control , The Progress Test for Solar power transformers is carried out during the manufacturing process to ensure that the transformer meets all design and quality requirements. These tests include verification of the core insulation, winding resistance, and dielectric strength of the transformer. Additionally, electrical components such as bushings, tap changers, and protection devices are tested for proper functionality. The progress test also checks the transformer’s ability to handle operational loads and voltage fluctuations. Any issues identified during these tests are addressed before moving on to the final testing stages, ensuring that the transformer is reliable, safe, and ready for commissioning. These tests are essential to confirm the transformer’s performance under real-world conditions and compliance with industry standards.
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
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
Transformer Factory Acceptance Test
NPC Electric will tests made for quality control by the manufacturer on every device or representative samples, or on parts or materials as required, to verify during production that the product meets the design specifications.
Factory Acceptance Test (FAT) for Solar power transformers is an essential procedure conducted before shipment to ensure the transformer meets all required standards and performs optimally. During the FAT, several critical tests are carried out:
Visual Inspection: Ensuring the transformer’s physical appearance, including the enclosure, bushings, and labeling, meets design specifications.
Electrical Testing: This includes measuring winding resistance, insulation resistance, and verifying the turns ratio to confirm proper electrical functionality.
The FAT ensures the Solar power transformers is reliable, safe, and ready for installation, guaranteeing compliance with industry standards before being dispatched to the customer.
Routine Test - On load Loss Test
Purpose of Testing
The purpose of On-load Loss Test is to measure the active power loss of the transformer under rated voltage and rated load, evaluate its energy efficiency level and design compliance, and provide a basis for energy consumption calculation and performance optimization during operation.
Testing Equipment
Power transformer test system (e.g. OMICRON, ISA, Tettex, Vanguard, etc.)
Voltage source and current source (usually rated voltage, or adjusted according to the test standard, such as 10 KV, 20 KV, 35 KV, etc.)
Temperature and humidity meter (used to record ambient temperature and humidity for correction of test data)
Voltage source and current source (usually rated voltage, or adjusted according to the test standard, such as 10 KV, 20 KV, 35 KV, etc.)
Temperature and humidity meter (used to record ambient temperature and humidity for correction of test data)
Pre-Test Preparation
Disconnect the transformer high voltage, low voltage and neutral power supply to ensure that the equipment is properly grounded and safely discharged.
The test environment should be dry and rainless, with a relative humidity of less than 75% and a recommended temperature range of 20–30°C.
The test environment should be dry and rainless, with a relative humidity of less than 75% and a recommended temperature range of 20–30°C.
Test Progress
Connect the Test Instrument:
Connect the test equipment to the appropriate terminals of the device under test and ensure that all wiring is correct and the device is well grounded.
Apply Test Voltage:
Apply the specified test voltage at the rated frequency and adjust the low voltage side to maintain the rated current (or specified current).
Connect the test equipment to the appropriate terminals of the device under test and ensure that all wiring is correct and the device is well grounded.
Apply Test Voltage:
Apply the specified test voltage at the rated frequency and adjust the low voltage side to maintain the rated current (or specified current).
Measure and Record
Start the test and record the following parameters:
On-Load Loss Power
Input Power and Output Power
Current
Voltage
Temperature (temperature rise or winding temperature)
Ambient temperature and humidity during the test
On-Load Loss Power
Input Power and Output Power
Current
Voltage
Temperature (temperature rise or winding temperature)
Ambient temperature and humidity during the test
Temperature Correction
The measured loss data is corrected based on a reference temperature (usually 20°C) to ensure the accuracy of the results.
Repeat Testing (if necessary)
Test different tap positions (Tap Changer) and record and compare the load loss data of each tap point.
Evaluation Criteria (Reference)
Evaluate the test results based on the equipment type and manufacturer requirements. If the load losses are low and the efficiency is high, it is considered "normal".
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
Solar Farm,Substation,Grid-connected System etc
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)
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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.
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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.
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Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
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