315kVA Oil Immersed Transformer
The 315kVA Oil Immersed Transformers are essential devices that convert electrical energy from one voltage level to another, enabling the efficient transmission and distribution of power across various systems. Oil-immersed transformers, in particular, have become industry favorites due to their superior cooling and insulation capabilities, which extend their lifespan and reduce maintenance requirements. The integration of renewable energy sources, such as wind and solar, requires transformers that can handle the variable output of these sources. 315kVA Oil Immersed Transformers are well-suited for this task due to their robustness and adaptability.
- Primary Voltage Ratings 34.5-19.92/13.8-7.957/13.2-7.62/12.47-7.2, 24.94, 26.25, 33 or others
- Secondary Voltage Ratings 480/277V, 400/230V, 380/220V or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Oil immersed distribution transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA, GB
- Application Residential Areas And Small Communities, Energy And Power Distribution Stations, Wind And Solar Power Generation Systems Etc
- Power Rating 315kVA
- Certificate ISO, CE, UL, IEEE
- Cooling Method ONAN, ONAN/ONAF, KNAN, KNAN/KNAF
- Oil Mineral Oil or FR3
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
315kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Technical Specifications | ||
| Rated Power | 315 kVA | |
| Rating Primary Voltage | 2.4 - 34.5kV | |
| 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 | |
| Color | ANSI 70 Light gray/Munsell 7GY3.29/1.5 or customized, etc | |
| Tank material | Mild Steel, 304 Stainless Steel | |
| Insulating Oil Weight | 480 kg | |
| Total Weight | 1720 kg | |
| Outline Dimensions（L×W×H）in. | 1780 × 1300 × 1890（mm) | |
| 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
315kVA Oil Immersed Transformer
NPC ELECTRIC’s three-phase oil-immersed transformers can be fully customized to meet your specific requirements. The optional specifications of the 315kVA three-phase oil-immersed transformer can adapt to different application scenarios and customer needs. In terms of voltage, the high-voltage side can be selected from common voltage levels such as 6kV, 10kV, and 35kV, and the low-voltage side is generally 0.4kV; other voltage values can also be customized on demand. There are two types of tap changers: on-load voltage regulation and off-excitation voltage regulation. On-load voltage regulation can adjust the voltage when the transformer is running to ensure voltage stability, which is suitable for places with high voltage quality requirements; off-excitation voltage regulation has a low cost and is suitable for environments with small voltage fluctuations.
In terms of cooling methods, in addition to the basic oil-immersed self-cooling (ONAN), oil-immersed air cooling (ONAF) can also be selected. When the transformer load is heavy or the ambient temperature is high, ONAF can accelerate heat dissipation through the fan to enhance the cooling effect. The protection level is optional, such as IP20 and IP23. IP20 can prevent the entry of larger solid foreign objects and is suitable for indoor clean environments; IP23 can also prevent water splashing on this basis and can be used outdoors or in humid environments.
In terms of cooling methods, in addition to the basic oil-immersed self-cooling (ONAN), oil-immersed air cooling (ONAF) can also be selected. When the transformer load is heavy or the ambient temperature is high, ONAF can accelerate heat dissipation through the fan to enhance the cooling effect. The protection level is optional, such as IP20 and IP23. IP20 can prevent the entry of larger solid foreign objects and is suitable for indoor clean environments; IP23 can also prevent water splashing on this basis and can be used outdoors or in humid environments.
In addition, an intelligent monitoring system can be equipped according to demand to monitor the temperature, humidity, load, winding temperature, and other parameters of the transformer in real time, and realize remote monitoring and fault warning. The insulation heat resistance level can also be customized, such as F level, H level, etc., to adapt to different operating temperatures and working conditions. There are also multiple options for grounding methods. The appropriate grounding scheme can be determined according to the power grid and installation environment to ensure safe operation.
Packing and Shipping
315kVA Oil Immersed Transformer
For this purpose, the packaging and transportation of 315kVA three-phase oil-immersed transformers are key links to ensure the safety and complete delivery of equipment to customers, including the following important contents:
In terms of packaging, the transformer body must first be fully protected. First, use professional cleaning agents to clean the impurities and oil stains on its surface, and then wrap it tightly with a plastic film with moisture-proof and rust-proof functions to prevent rust caused by moisture erosion during transportation. For key accessories such as radiators, oil pillows, and gas relays, customized foam or sponges are used for separate wrapping. These cushioning materials can effectively reduce the damage caused by collisions and vibrations. Subsequently, the transformer body and the wrapped accessories are packed together in a special, large wooden or metal box. The box must have sufficient strength and rigidity to withstand various external forces during transportation. Special fixing devices such as angle steel and bolts are set up in the box to firmly fix the transformer to the bottom of the box to prevent it from shaking or displacement during transportation. At the same time, the surface of the box is clearly marked with obvious signs such as "upward", "fragile", and "moisture-proof" to remind transportation personnel to handle and store it correctly.
In terms of transportation, it is necessary to carefully choose the appropriate mode of transportation according to factors such as the transportation distance, the geographical environment of the destination, and customer requirements. For short-distance transportation, road transportation is a common choice, and large trucks with sufficient carrying capacity and good shock absorption performance should be selected. When loading the transformer, ensure that its center of gravity is stable, and use steel wire ropes, iron chains, and other fixing devices to firmly connect the box to the truck to prevent the box from sliding or colliding due to bumps, braking, etc., during driving. If the transportation distance is long, rail transportation or water transportation may be more appropriate. In rail transportation, loading and fixing must be carried out in strict accordance with the regulations of the railway department; water transportation must consider the stability of the ship and moisture-proof measures. During the entire transportation process, arrange special personnel to track the position and status of the transport vehicle or ship in real time, and regularly check the fastening of the fixing device and the appearance of the box. If any abnormality is found, take appropriate measures to deal with it in time. In addition, no matter which mode of transportation is used, rain, sun, moisture, and other measures must be taken to prevent the transformer from being affected by bad weather.
In terms of packaging, the transformer body must first be fully protected. First, use professional cleaning agents to clean the impurities and oil stains on its surface, and then wrap it tightly with a plastic film with moisture-proof and rust-proof functions to prevent rust caused by moisture erosion during transportation. For key accessories such as radiators, oil pillows, and gas relays, customized foam or sponges are used for separate wrapping. These cushioning materials can effectively reduce the damage caused by collisions and vibrations. Subsequently, the transformer body and the wrapped accessories are packed together in a special, large wooden or metal box. The box must have sufficient strength and rigidity to withstand various external forces during transportation. Special fixing devices such as angle steel and bolts are set up in the box to firmly fix the transformer to the bottom of the box to prevent it from shaking or displacement during transportation. At the same time, the surface of the box is clearly marked with obvious signs such as "upward", "fragile", and "moisture-proof" to remind transportation personnel to handle and store it correctly.
In terms of transportation, it is necessary to carefully choose the appropriate mode of transportation according to factors such as the transportation distance, the geographical environment of the destination, and customer requirements. For short-distance transportation, road transportation is a common choice, and large trucks with sufficient carrying capacity and good shock absorption performance should be selected. When loading the transformer, ensure that its center of gravity is stable, and use steel wire ropes, iron chains, and other fixing devices to firmly connect the box to the truck to prevent the box from sliding or colliding due to bumps, braking, etc., during driving. If the transportation distance is long, rail transportation or water transportation may be more appropriate. In rail transportation, loading and fixing must be carried out in strict accordance with the regulations of the railway department; water transportation must consider the stability of the ship and moisture-proof measures. During the entire transportation process, arrange special personnel to track the position and status of the transport vehicle or ship in real time, and regularly check the fastening of the fixing device and the appearance of the box. If any abnormality is found, take appropriate measures to deal with it in time. In addition, no matter which mode of transportation is used, rain, sun, moisture, and other measures must be taken to prevent the transformer from being affected by bad weather.
32
32 years of industry experience
Manufacturer Test
315kVA Oil Immersed Transformer
Progress Test
NPC ELECTRIC manufactures three-phase oil-immersed transformers the strict quality control. The process test of 315kV three-phase oil-immersed transformers mainly includes the following contents:
Raw materials and parts inspection
Microstructure analysis of silicon steel sheets: In addition to the routine inspection of silicon steel sheet specifications, material certification, etc., the microstructure analysis of silicon steel sheets is also carried out. The microscopic characteristics of silicon steel sheets, such as grain size and orientation, are observed through a metallographic microscope to ensure that they meet the design requirements, because the microstructure will affect the core loss and electromagnetic performance of the transformer.
Winding wire coating quality inspection: For winding wires, not only are the conventional parameters such as diameter and resistivity tested, but also the coating quality of the wires is tested. The coating thickness gauge is used to measure the coating thickness, and the corrosion resistance of the coating is tested through a salt spray test to ensure that the electrical performance of the wire will not be affected by coating problems during long-term operation.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ 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
The Transformer Factory Acceptance Test (FAT) for 315kVA three-phase oil-immersed 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:
Appearance inspection: Check the transformer's casing, terminals, markings, oil level, etc. to ensure that there is no physical damage or defects.
Oil immersion inspection: Confirm that the transformer's oil immersion process meets the requirements, the oil quality is qualified, the oil level is normal and there are no impurities.
Electrical performance test:
No-load test: Measure the transformer's no-load current, no-load loss, etc., to confirm that its performance at no-load meets the standard.
Load test: Test the transformer's voltage, current, power loss, etc., under different loads to ensure that the transformer operates stably under the working load.
Short-circuit impedance test: Measure the transformer's short-circuit impedance to confirm that it meets the design specifications.
Routine Test - No Load Loss Test
Purpose of Testing
The purpose of No Load Loss Test is to measure the power loss of the equipment when it is not loaded to evaluate the iron loss and other core losses. This test can help understand the energy efficiency of the equipment and help determine the performance of the transformer or motor when it is running at no load.
Testing Equipment
No Load Loss tester (e.g. OMICRON, Megger, Schneider Electric, etc.)
Voltage source (usually 230V, 400V or customized according to customer requirements to adapt to different equipment)
Power analyzer (used to measure power loss and efficiency)
Ammeter and voltmeter
Temperature and humidity meter
Voltage source (usually 230V, 400V or customized according to customer requirements to adapt to different equipment)
Power analyzer (used to measure power loss and efficiency)
Ammeter and voltmeter
Temperature and humidity meter
Pre-Test Preparation
Disconnect the power supply of the device and ensure that the device is properly grounded and discharged to ensure safe operation.
Please ensure that the test is carried out in a suitable environment with a relative humidity of less than 75% and avoid rainy days or extreme weather (recommended temperature range: 20-30°C).
Please ensure that the test is carried out in a suitable environment with a relative humidity of less than 75% and avoid rainy days or extreme weather (recommended temperature range: 20-30°C).
Test Progress
Connect the Test Instrument:
Connect the test equipment to the high voltage side of the transformer, making sure the wiring is correct and the equipment is grounded.
Apply Test Voltage:
Usually it is 110% of the rated voltage, for example, if the rated voltage of the transformer is 33 KV, apply 36.3 KV (110%).
Connect the test equipment to the high voltage side of the transformer, making sure the wiring is correct and the equipment is grounded.
Apply Test Voltage:
Usually it is 110% of the rated voltage, for example, if the rated voltage of the transformer is 33 KV, apply 36.3 KV (110%).
Measure and Record
Start the test and record the following parameters:
No Load Current
No Load Loss
Power Factor
Current
Voltage
Temperature and Humidity
No Load Current
No Load Loss
Power Factor
Current
Voltage
Temperature and Humidity
Temperature Correction
The power loss of the test results is corrected to a reference temperature (usually 20°C) to ensure an accurate evaluation.
Repeat Testing (if necessary)
Test at different rated voltages, especially when the transformer has multiple capacity levels, and perform no-load loss tests for each capacity level separately.
Evaluation Criteria (Reference)
No-load loss ≤ 0.2% rated power (excellent)
No-load loss < 0.2% ≤ 0.5% rated power (good)
No-load loss > 0.5% rated power (further inspection or corrective action required)
No-load loss < 0.2% ≤ 0.5% rated power (good)
No-load loss > 0.5% rated power (further inspection or corrective action required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Residential Areas And Small Communities, Energy And Power Distribution Stations, Wind And Solar Power Generation Systems 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)
Transformers Packaging (6)
Transformers Packaging (7)
Transformers Packaging (8)
Related Products
80kVA Dry Type Transformer
80kVA dry-type transformer launched by NPC ELECTRIC adopts advanced dry insulation technology, has the advantages of high efficiency, environmental protection, and safety, and is widely used in industrial, commercial, and residential power systems. The transformer has a compact design, strong load-bearing capacity, stable operation, and effectively reduces energy loss. The oil-free structure reduces the risk of fire, meets modern green environmental standards, and is suitable for use in environments with high requirements for power stability and low noise.
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.
2000kVA Dry Type Transformer
The NPC ELECTRIC 2000kVA Dry Type Transformer is a robust and efficient power solution designed to handle the electrical needs of large-scale industrial and commercial operations. With a capacity of 2000kVA, it features advanced dry-type insulation, ensuring enhanced safety, minimal maintenance, and long-lasting performance. This transformer is built to operate reliably in various environmental conditions while offering low noise levels and a reduced environmental footprint.
4000kVA Three Phase Pad Mounted Transformer
NPC ELECTRIC's 4000kVA Three Phase Pad Mounted transformer is made of high-performance silicon steel sheets and high-quality insulating oil. It complies with international standards such as IEC 60076 and ANSI C57. It has excellent electrical performance and weather resistance. It is suitable for large industrial parks, urban distribution stations, and new energy power generation systems. It is an ideal choice for high-reliability and high-efficiency power distribution.
1500kVA Oil Immersed Transformer
NPC ELECTRIC's 1500kVA oil-immersed transformer adopts advanced technology, complies with international IEC, ANSI, and other standards, and has efficient and stable power conversion capabilities. It uses oil-immersed cooling technology, has excellent heat dissipation performance and durability, and ensures long-term stable operation of the equipment in harsh environments.
35kV 46kV Power Transformer
NPC ELECTRIC's 35kV and 46kV power transformer complies with international standards such as IEC and ANSI, and features high efficiency, low loss, and strong insulation. This product is widely used in power grid main transformers, power plants, industrial and mining enterprises, and large infrastructure projects. It has a compact structure and reliable operation, and is suitable for all types of outdoor and indoor installation environments.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