66kV 69kV Power Transformer
66 69kV power transformer uses high-performance silicon steel sheets and a fully sealed structure design, with excellent insulation performance and thermal stability. The product complies with international and national standards, such as 1 . IEC 60076 Power Transformers; 2. AS NZS 60076 Power Transformers CSAC88-16 Power Transformers 3.ANSI/IEEE C57.12.00 IEEE Standard for General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers;
4. GOST R 52719 Power Transformers - General Specifications;
5. EN60076 Poer Transformer;8. Local After-Sales Services In North America South
- Primary Voltage Ratings 69kV 66kV 63kV or others
- Secondary Voltage Ratings 33/13.8/11 kV or customized
- H.V. Tap Range ±8×1.25% or others
- Type Oil-immersed power transformer
- BIL Up to 350kV
- Standards IEEE, ANSI, IEC, CSA
- Application Transmission and distribution systems, industrial parks, power plants and urban substations etc
- Power Rating 5000-400000kVA
- Certificate UL ,CESI ,ISO
- Cooling Method ONAN/ ONAF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
66kV 69kV Power Transformer
Technical Specifications
Accessories
| Rated Power | 5000-400000kVA |
| Rating Primary Voltage | 69kV 66kV 63kV or others |
| Secondary Voltage |
33kV 13.8kV 11kV Customized |
| Frequency | 50/60Hz |
| Vector Group | Dyn11, YNd1, Dyn1, YNd11 or others |
| 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
66kV 69kV Power Transformer
NPC ELECTRIC's 66 69kV power transformer has excellent stability and efficiency, and uses high-quality materials to ensure long-term high reliability. Its design meets international standards to ensure normal operation in various harsh environments. The transformer has excellent load capacity and can effectively cope with different changes in power demand. It has a built-in efficient cooling system to effectively reduce equipment overheating, improve operating efficiency, and extend service life. It uses advanced insulation technology to reduce power loss and improve safety. The transformer's shell adopts an anti-corrosion design to ensure its long-term use in humid or harsh environments. It is easy to install and maintain, and provides professional technical support and services. Its intelligent control system can monitor the operating status in real time to ensure the safety and stability of the transformer.
The equipment has a low noise level and meets environmental protection requirements. The transformer has a compact design structure and a small footprint, which is suitable for various installation environments. It is suitable for urban power grids, industrial enterprises, and energy systems to meet various power supply needs. The overall performance is superior, which can effectively reduce the occurrence of failures and ensure the continuity and stability of the power supply.
Packing and Shipping
66kV 69kV Power Transformer
NPC ELECTRIC's 66kV and 69kV power transformers are packed and shipped with strict protection measures to ensure the safety of the product during transportation.
First, the transformer is wrapped in a waterproof plastic film to prevent the humid environment from damaging the equipment. Then, the transformer is fixed to the transportation platform with a sturdy wooden box or steel frame to avoid shaking or impact during transportation. The box is filled with high-density foam material to effectively absorb external vibration and impact, further ensuring the safety of the equipment.
In order to prevent the transformer from being damaged during transportation, shock pads and shock absorbers are also used for additional fixing in the box. For long-distance transportation, the weight and volume of the transformer usually require the use of special transportation tools such as flatbed trucks and containers to ensure its stable transportation.
During transportation, we will provide insurance according to customer requirements to protect the equipment from any potential risks during transportation. The insurance cost is usually calculated according to the value of the equipment and the mode of transportation. If the customer requires special transportation conditions, NPC ELECTRIC can also provide customized packaging services. Before transportation, we will explain the transportation plan and costs to the customer in detail to ensure transparent communication.
After the transformer arrives at the destination, the staff will unload and transport it according to the installation requirements and specifications. After the installation and commissioning work is completed, the customer can put it into use directly. In order to avoid delays, the real-time location of the transformer will be tracked in advance during transportation, and the latest transportation information will be provided to the customer.
First, the transformer is wrapped in a waterproof plastic film to prevent the humid environment from damaging the equipment. Then, the transformer is fixed to the transportation platform with a sturdy wooden box or steel frame to avoid shaking or impact during transportation. The box is filled with high-density foam material to effectively absorb external vibration and impact, further ensuring the safety of the equipment.
In order to prevent the transformer from being damaged during transportation, shock pads and shock absorbers are also used for additional fixing in the box. For long-distance transportation, the weight and volume of the transformer usually require the use of special transportation tools such as flatbed trucks and containers to ensure its stable transportation.
During transportation, we will provide insurance according to customer requirements to protect the equipment from any potential risks during transportation. The insurance cost is usually calculated according to the value of the equipment and the mode of transportation. If the customer requires special transportation conditions, NPC ELECTRIC can also provide customized packaging services. Before transportation, we will explain the transportation plan and costs to the customer in detail to ensure transparent communication.
After the transformer arrives at the destination, the staff will unload and transport it according to the installation requirements and specifications. After the installation and commissioning work is completed, the customer can put it into use directly. In order to avoid delays, the real-time location of the transformer will be tracked in advance during transportation, and the latest transportation information will be provided to the customer.
32
32 years of industry experience
Manufacturer Test
66kV 69kV Power Transformer
Progress test
NPC Electric's 66kV and 69kV power transformers have undergone rigorous production testing during the production process. First, the design and manufacture of the transformers comply with relevant international standards to ensure their stable operation under high-voltage environments. Secondly, a series of tests, including electrical strength, temperature rise, load characteristics, and other tests, were carried out to verify their performance and safety. Then, each key component was inspected in detail to ensure that there were no defects. All test results met the design requirements and were confirmed by the customer. Finally, the transformers were fully commissioned and performance verified to ensure that they can achieve the expected efficiency and reliability in actual operation.
Design Tests
All transformers will be tested after finishing the production test items as below:
♦ 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 to 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
NPC Electric conducts rigorous quality control testing on every transformer or representative samples, as well as on specific components and materials, to ensure compliance with design specifications throughout the production process.
The Factory Acceptance Test (FAT) for a power transformer is a critical step performed before shipment to verify that the unit meets all applicable standards and delivers optimal performance. The FAT includes the following key procedures:
Visual Inspection: Evaluates the transformer’s physical condition, including the enclosure, terminals, and labeling, to ensure conformance with design and safety requirements.
Electrical Testing: Involves measuring winding resistance, insulation resistance, and performing turns ratio tests to validate electrical integrity and functionality.
Dielectric Strength Test: Applies high voltage across the insulation system to ensure it can endure both normal and transient operating voltages without failure.
Load Testing: Simulates real-world operating conditions to assess the transformer’s voltage regulation, temperature rise, and overall efficiency under load.
Protection Device Testing: Verifies the proper operation of integrated protective components such as thermal sensors, temperature relays, and tap changers (if applicable).
Routine Test - Test of transformer oil
Purpose of Testing
The purpose of testing transformer oil is to evaluate its condition and ensure it is still effective in providing insulation and cooling for the transformer. This test helps detect contaminants such as moisture, gas buildup, or impurities, which can compromise the oil’s performance and, consequently, the transformer’s reliability and longevity. Regular oil testing enables early detection of potential issues, allowing for corrective actions to prevent transformer failure.
Testing Equipment
Dielectric Strength Tester: Measures the insulating capacity of the oil by applying high voltage.
Dissolved Gas Analyzer (DGA): Detects gases in the oil that indicate internal faults.
Acid Value Tester: Determines the oil's acidity to check for oxidation.
Dissolved Gas Analyzer (DGA): Detects gases in the oil that indicate internal faults.
Acid Value Tester: Determines the oil's acidity to check for oxidation.
Pre-Test Preparation
Disconnect the transformer from the electrical grid to avoid any electrical hazards during testing.
Prepare oil sampling kits, testing instruments (e.g., dielectric strength tester, gas analyzer), and clean containers for oil samples.
Ensure all personnel are equipped with necessary safety gear, such as gloves, goggles, and protective clothing.
Visually inspect the oil for signs of contamination or abnormal color before collecting samples.
Prepare oil sampling kits, testing instruments (e.g., dielectric strength tester, gas analyzer), and clean containers for oil samples.
Ensure all personnel are equipped with necessary safety gear, such as gloves, goggles, and protective clothing.
Visually inspect the oil for signs of contamination or abnormal color before collecting samples.
Test Progress
Oil Sampling:
Carefully extract oil samples from the transformer at specific locations (such as the oil conservator or top of the tank) to ensure accurate representation of the oil’s condition.
Chemical and Gas Analysis:
The pressure is maintained for a set period (usually 30-60 minutes) to observe if there is any drop in pressure, which could indicate a leak.
Carefully extract oil samples from the transformer at specific locations (such as the oil conservator or top of the tank) to ensure accurate representation of the oil’s condition.
Chemical and Gas Analysis:
The pressure is maintained for a set period (usually 30-60 minutes) to observe if there is any drop in pressure, which could indicate a leak.
Test Standard
IEC 60076 Oil-immersed power transformers
ASTM D1816 Dielectric Breakdown Voltage of Insulating Liquids
ASTM D1816 Dielectric Breakdown Voltage of Insulating Liquids
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Transmission and distribution systems, industrial parks, power plants, and urban substations 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)
Transformers Packaging (3)
Transformers Packaging (4)
Transformers Packaging (5)
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Transformers Packaging (8)
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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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