130kV 10MVA / 25MVA / 40MVA Electrical Power Transformer
The 130kV Electrical Power Transformer with ratings of 10MVA, 25MVA, and 40MVA is designed to support medium-to-large capacity power transmission and distribution systems. It is engineered to provide consistent voltage conversion, high operational efficiency, and excellent thermal stability under variable grid conditions. The transformer incorporates a precisely calculated magnetic core, high-strength winding design, and an oil-immersed insulation system that enhances heat dissipation and electrical reliability. Its structure is optimized to withstand electrical stress, mechanical vibration, and long-term continuous operation. Suitable for outdoor installation, the transformer maintains stable performance in challenging environments such as high temperature, humidity, or heavy industrial zones. Built in accordance with recognized international standards, it offers dependable service life and reduced maintenance requirements for modern power networks.
- Primary Voltage Ratings 110kV, 115kV, 130kV or others
- Secondary Voltage Ratings 11/10.5/6.6/6.3kV or customized
- H.V. Tap Range ± 8×2.5% HV taps or others
- Type Oil-immersed power transformer
- BIL up to 350kV
- Standards IEEE, ANSI, IEC
- Application industrial power systems, renewable energy integration projects, infrastructure development
- Power Rating 10MVA / 25MVA / 40MVA
- Certificate UL , CESI , CE
- Cooling Method ONAN/ ONAF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
130kV 10MVA / 25MVA / 40MVA Electrical Power Transformer
Technical Specifications
Accessories
| Rated Power | 10MVA / 25MVA / 40MVA |
| Rating Primary Voltage | 110kV, 115kV, 130kV |
| Secondary Voltage |
6.3 kV 6.6 kV 10.5 kV 11 kV Customized |
| Frequency | 50/60Hz |
| Vector Group | Dyn11, YD11, YNd11 |
| Winding Material | Aluminum/Copper |
| Efficiency | As IEEE, CAS Std or Customized |
| Impedance Voltage | As IEC |
| Altitude | ≤1,000m or Customized |
| Enclosure material | Mid Steel |
| HV Bushing |
| LV Bushing |
| OLTC/NLTC |
| Lifting hook for complete transformer |
| Name plate |
| Oil temperature |
| Winding temperature |
| Radiators |
| Oil level |
| Pressure relief valve |
| CT |
Customization Optional
130kV 10MVA / 25MVA / 40MVA Electrical Power Transformer
The 130kV Electrical Power Transformer can be customized to suit a wide range of system designs, operating conditions, and utility standards. Customers may specify rated capacity within the 10MVA to 40MVA range, primary and secondary voltage combinations, frequency requirements, and impedance levels. Various vector group configurations can be selected to ensure compatibility with existing grid topology. Winding materials may be configured based on performance or budget considerations, and insulation systems can be adapted for higher thermal class or special environmental demands. Voltage regulation solutions include both off-circuit and on-load tap changers, allowing stable output during load fluctuation or network expansion.
Structural and functional customization options further enhance adaptability. The transformer tank can be designed for compact substations, high seismic zones, or corrosive environments using reinforced steel structures and specialized surface treatments. Cooling configurations may be adjusted according to load profile and ambient temperature to optimize efficiency and lifespan. Optional accessories include comprehensive monitoring and protection devices such as oil temperature indicators, winding temperature sensors, gas detection relays, pressure relief systems, and digital monitoring interfaces. Customers may also request low-noise designs, environmentally friendly insulating fluids, custom color finishes, and labeling standards. Each customized transformer undergoes dedicated engineering review to ensure full compliance with technical and regulatory requirements.
Packing and Shipping
130kV 10MVA / 25MVA / 40MVA Electrical Power Transformer
Packing and shipping of the 130kV Electrical Power Transformer are carefully managed to protect the unit throughout transportation and handling. Prior to packing, the transformer is thoroughly inspected, cleaned, and treated with anti-corrosion coatings. All external interfaces are sealed, and internal components are secured to prevent movement or contamination. Detachable accessories such as bushings, cooling equipment, and monitoring devices are removed when necessary and packed separately using reinforced export-grade crates with internal cushioning and moisture protection.
The transformer body is fixed onto a heavy-duty transport base designed to distribute weight evenly and absorb vibration. Protective materials such as shock-resistant pads, moisture barriers, and reinforced bracing are applied at critical points to prevent mechanical damage. For long-distance transport, additional protection measures such as vacuum sealing or inert gas filling may be used to preserve insulation integrity and oil quality.
Shipping arrangements are selected according to transformer size, weight, and destination logistics. Available methods include flat-rack containers, open-top containers, or break-bulk shipment for oversized units. All packing materials comply with international export and phytosanitary standards. Clear markings indicate lifting locations, center of gravity, handling orientation, and safety precautions to ensure proper handling during loading and unloading.
Complete shipping documentation accompanies each shipment, including packing lists, inspection records, test reports, drawings, and operation manuals. Upon arrival, customers receive detailed instructions for unpacking, storage, and installation. Optional services such as on-site supervision, oil treatment, accessory installation, and commissioning assistance are available to support smooth project execution.
The transformer body is fixed onto a heavy-duty transport base designed to distribute weight evenly and absorb vibration. Protective materials such as shock-resistant pads, moisture barriers, and reinforced bracing are applied at critical points to prevent mechanical damage. For long-distance transport, additional protection measures such as vacuum sealing or inert gas filling may be used to preserve insulation integrity and oil quality.
Shipping arrangements are selected according to transformer size, weight, and destination logistics. Available methods include flat-rack containers, open-top containers, or break-bulk shipment for oversized units. All packing materials comply with international export and phytosanitary standards. Clear markings indicate lifting locations, center of gravity, handling orientation, and safety precautions to ensure proper handling during loading and unloading.
Complete shipping documentation accompanies each shipment, including packing lists, inspection records, test reports, drawings, and operation manuals. Upon arrival, customers receive detailed instructions for unpacking, storage, and installation. Optional services such as on-site supervision, oil treatment, accessory installation, and commissioning assistance are available to support smooth project execution.
32
32 years of industry experience
Manufacturer Test
130kV 10MVA / 25MVA / 40MVA Electrical Power Transformer
Progress test
Progress testing for the 130kV 10–40MVA Electrical Power Transformer is conducted at multiple production stages to maintain strict quality control. Raw materials such as magnetic steel, conductors, insulation materials, and insulating oil are verified against approved specifications before production begins. During core assembly and winding manufacture, inspections focus on dimensional accuracy, insulation placement, and mechanical stability. Drying and vacuum processing of the active part are monitored to ensure optimal moisture removal and insulation performance.
Additional checks include intermediate electrical measurements such as winding resistance, continuity, and turns ratio verification prior to final assembly. Tank fabrication undergoes inspection for weld quality, structural integrity, and surface treatment. Pressure and sealing tests confirm oil tightness before oil filling. All progress test results are documented, reviewed, and approved to ensure consistent quality and early identification of any deviations.
Design Tests
All transformers will be tested after finishing the production test items as follows:
♦ Leak testing with pressure for liquid-immersed transformers
♦ Test of transformer oil
♦ Measurement of voltage ratio and check of phase displacement
♦ Measurement of winding DC resistance
♦ Measurement of d. c. Insulation resistance between each winding and earth, and check of the core and frame insulation
♦ Capacitive bushing test
♦ Measurement of dissipation factor (tan δ) of the insulation system capacitances, and determination of capacitances windings-to-earth
♦ Measurement of no-load loss and current at 90%,100%,110% of rated voltage
♦ Operation test on on-load tap-changer
♦ Measurement of short-circuit impedance and load loss
♦ Lightning impulse test
♦ Induced-voltage test with partial discharge measurement
♦ Auxiliary wiring check
♦ Current transformer test
♦ Frequency response analysis test
Transformer Factory Acceptance Test
The Factory Acceptance Test for the 130kV Electrical Power Transformer is performed after final assembly to confirm compliance with contractual specifications and international standards. Routine electrical tests include winding resistance measurement, voltage ratio verification, vector group confirmation, polarity checks, and insulation resistance testing. Dielectric tests, such as applied voltage and induced overvoltage tests, verify insulation strength under rated conditions.
Performance testing evaluates no-load losses, load losses, impedance voltage, and temperature rise to ensure efficiency and thermal stability. Partial discharge testing assesses insulation quality, while impulse testing verifies resistance to transient overvoltage events. Mechanical inspections include oil tank pressure testing, leak inspection, cooling system operation checks, and tap changer functionality verification. Oil samples are analyzed to confirm dielectric strength and cleanliness. All test results are compiled into a formal FAT report and approved prior to shipment.
Routine Test - Measurement Of Voltage Ratio And Check Of Phase Displacement
Purpose of Testing
The purpose of measuring the voltage ratio and checking the phase displacement is to verify that the transformer’s windings are correctly connected and functioning according to design specifications. The voltage ratio test ensures that the transformer delivers the correct output voltage relative to its input, while the phase displacement check confirms that the phase relationship between primary and secondary windings is accurate.
Testing Equipment
Voltage Ratio Tester (also known as a Transformer Turns Ratio Tester, TTR Tester)
Phase Displacement Tester (also called Phase Angle Meter or Phase Sequence Meter)
Digital Multimeter (for basic checks)
Oscilloscope (for phase displacement)
Phase Displacement Tester (also called Phase Angle Meter or Phase Sequence Meter)
Digital Multimeter (for basic checks)
Oscilloscope (for phase displacement)
Pre-Test Preparation
The transformer must be completely disconnected from any live electrical circuits to prevent electrical hazards. Ensure that the transformer is de-energized and isolated from the system before beginning any testing.
Visually inspect the primary and secondary winding connections of the transformer to ensure that they are properly configured and accessible for testing. Ensure that the transformer tap settings are clearly labeled and can be adjusted if necessary.
Ensure all personnel are equipped with appropriate safety gear (e.g., gloves, safety glasses) and that proper grounding and earthing procedures are in place to prevent electrical accidents.
Visually inspect the primary and secondary winding connections of the transformer to ensure that they are properly configured and accessible for testing. Ensure that the transformer tap settings are clearly labeled and can be adjusted if necessary.
Ensure all personnel are equipped with appropriate safety gear (e.g., gloves, safety glasses) and that proper grounding and earthing procedures are in place to prevent electrical accidents.
Test Progress
Ensure Safety and Equipment Setup:
Begin by confirming that the transformer is de-energized and isolated from any live circuits. Set up the necessary testing equipment, including the voltage ratio tester, phase displacement tester, and any other required tools. Verify that all equipment is properly calibrated and ready for use. Voltage Ratio Measurement:
Apply a known voltage to the primary winding of the transformer using the voltage ratio tester. Measure the corresponding voltage at the secondary winding. Calculate the voltage ratio by comparing the primary and secondary voltages. Ensure that the measured ratio aligns with the transformer's rated specification. If the ratio deviates significantly, it may indicate an issue with the windings or tap settings.
Begin by confirming that the transformer is de-energized and isolated from any live circuits. Set up the necessary testing equipment, including the voltage ratio tester, phase displacement tester, and any other required tools. Verify that all equipment is properly calibrated and ready for use. Voltage Ratio Measurement:
Apply a known voltage to the primary winding of the transformer using the voltage ratio tester. Measure the corresponding voltage at the secondary winding. Calculate the voltage ratio by comparing the primary and secondary voltages. Ensure that the measured ratio aligns with the transformer's rated specification. If the ratio deviates significantly, it may indicate an issue with the windings or tap settings.
Test Standard
IEC 60076 Oil-immersed power transformers
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
This transformer is suitable for high-voltage substations, regional transmission networks, industrial power systems, renewable energy integration projects, and infrastructure developments requiring dependable voltage conversion and stable long-term power delivery.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
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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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