200kVA Oil Immersed Transformer
The 200kVA oil-immersed transformer produced by our company adopts a new insulation structure to improve the short-circuit resistance; the iron core is made of high-quality cold-rolled silicon steel sheet; the high-voltage winding is made of high-quality oxygen-free copper wire and adopts a multi-layer cylindrical structure; all fasteners are treated with special anti-loosening treatment. Standard configuration includes mineral oil or FR3 natural ester fluid, ONAN cooling, aluminum or copper windings, high-voltage 34.5kV / 24.94kV / 13.8kV / 12.47kV / 4.16kV.
- 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 Small Communities, Power Distribution Stations
- Power Rating 200kVA
- 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
200kVA Oil Immersed Transformer
Technical Specifications
Accessories
| Rated Power | 200 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 | 305 kg | |
| Total Weight | 1350 kg | |
| Outline Dimensions（L×W×H）in. | 1455 × 1050 × 1580（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
200kVA Oil Immersed Transformer
NPC ELECTRIC’s three-phase oil-immersed transformers can be fully customized to meet your specific requirements.
The optional specifications of 200 kVA three-phase oil-immersed transformers provide a variety of customized options to meet the needs of different application scenarios. Users can choose different input and output voltage levels according to actual needs, such as 10kV/0.4kV, 11kV/0.4kV, etc., to adapt to different power distribution requirements. The insulation level and cooling method of the transformer can also be adjusted according to the use environment, such as providing natural oil cooling or a forced oil cooling system to optimize the heat dissipation effect. To improve safety and reliability, temperature monitoring devices, overload protection systems, and short circuit protection functions are also optional.
The optional specifications of 200 kVA three-phase oil-immersed transformers provide a variety of customized options to meet the needs of different application scenarios. Users can choose different input and output voltage levels according to actual needs, such as 10kV/0.4kV, 11kV/0.4kV, etc., to adapt to different power distribution requirements. The insulation level and cooling method of the transformer can also be adjusted according to the use environment, such as providing natural oil cooling or a forced oil cooling system to optimize the heat dissipation effect. To improve safety and reliability, temperature monitoring devices, overload protection systems, and short circuit protection functions are also optional.
In addition, the transformer can also be customized according to noise requirements, providing a low-noise design, suitable for noise-sensitive environments. Anti-corrosion coating and moisture-proof protection are also optional configurations for severe weather and environmental conditions. With these optional specifications, the 200 kVA oil-immersed transformer can flexibly respond to various industrial, commercial and residential power needs. Protection and switching configurations include radial or loop-feed, dead-front or live-front bushings, load-break elbow-operated switches, bayonet expulsion fuses + partial-range current-limiting fuses, external or internal arresters (normal/heavy duty), and visible break options. Accessories can be tailored with oil temperature/pressure gauges, liquid level indicators, sudden pressure relay, nitrogen blanket system, FR3-compatible gauges, wildlife guards, and digital monitoring (temperature, oil condition, SCADA-ready).
Packing and Shipping
200kVA Oil Immersed Transformer
NPC ELECTRIC 200kVA Oil Immersed Transformer is designed to be securely packaged for sea freight transport, ensuring safe delivery across long distances.
For this purpose, our company's 200kVA three-phase oil-immersed transformers are packed and transported with comprehensive protection measures to ensure that the equipment can reach the customer's designated location safely and efficiently. First of all, before leaving the factory, the transformer undergoes strict quality inspection and performance testing to ensure that it meets technical standards and customer-specific requirements. The exterior and key components of the transformer, such as the oil tank and electrical wiring parts, will be tightly wrapped with waterproof, moisture-proof, and rust-proof materials to ensure that the equipment is not affected by the external environment during transportation and prevent any possible corrosion or contamination.
To ensure transportation safety, the transformer is installed in a sturdy wooden or steel frame. The frame design takes into account the needs of shock and impact resistance, and the interior is filled with shock-proof foam or other cushioning materials to effectively reduce the impact of vibration and collision on the equipment during transportation. All external packaging will be specially reinforced according to the mode of transportation (land, sea, or air) to ensure the stability of the transformer during transportation. At the same time, clear handling instructions and warning labels will be marked on the packaging to remind the handling personnel to operate carefully to avoid any damage caused by improper operation.
We will choose experienced and reliable logistics companies for transportation, and choose the most suitable transportation method according to the specific needs of the destination. During the entire transportation process, the logistics company will track the transformer in real time to ensure safe delivery on time and as required. After arriving at the destination, we will provide detailed unloading and installation instructions to ensure that the transformer can be put into use smoothly and safely, and meet the customer's operation and maintenance needs
For this purpose, our company's 200kVA three-phase oil-immersed transformers are packed and transported with comprehensive protection measures to ensure that the equipment can reach the customer's designated location safely and efficiently. First of all, before leaving the factory, the transformer undergoes strict quality inspection and performance testing to ensure that it meets technical standards and customer-specific requirements. The exterior and key components of the transformer, such as the oil tank and electrical wiring parts, will be tightly wrapped with waterproof, moisture-proof, and rust-proof materials to ensure that the equipment is not affected by the external environment during transportation and prevent any possible corrosion or contamination.
To ensure transportation safety, the transformer is installed in a sturdy wooden or steel frame. The frame design takes into account the needs of shock and impact resistance, and the interior is filled with shock-proof foam or other cushioning materials to effectively reduce the impact of vibration and collision on the equipment during transportation. All external packaging will be specially reinforced according to the mode of transportation (land, sea, or air) to ensure the stability of the transformer during transportation. At the same time, clear handling instructions and warning labels will be marked on the packaging to remind the handling personnel to operate carefully to avoid any damage caused by improper operation.
We will choose experienced and reliable logistics companies for transportation, and choose the most suitable transportation method according to the specific needs of the destination. During the entire transportation process, the logistics company will track the transformer in real time to ensure safe delivery on time and as required. After arriving at the destination, we will provide detailed unloading and installation instructions to ensure that the transformer can be put into use smoothly and safely, and meet the customer's operation and maintenance needs
32
32 years of industry experience
Manufacturer Test
200kVA Oil Immersed Transformer
Progress Test
NPC Electric manufactures three-phase oil-immersed transformers the strict quality control. The Progress Test for a 200kVA is a test conducted at various stages during the transformer production process. The purpose is to ensure the quality of each manufacturing link and to detect potential problems in a timely manner to ensure that the transformer is of a qualified quality when it is finally shipped. The main contents include: Component inspection: Check whether the various components of the transformer (such as core, winding, insulation material, etc.) meet the design requirements and meet the quality standards. Process inspection: Check in each production link, such as the production and assembly process of the winding, to ensure that each step meets the standards and specifications. Electrical inspection: Perform preliminary electrical tests during the assembly process to confirm that all electrical connections are correct and the equipment can work properly. Welding and sealing inspection: Check whether the transformer's oil tank welding is firm and the sealing is perfect to ensure that the equipment does not leak oil during transportation and use.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ 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
♦ 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 a 200kVA three-phase Oil immersed transformers is a series of comprehensive inspections and tests conducted after the transformer is produced and assembled before leaving the factory, aiming to confirm that the equipment meets the design specifications and technical requirements, and ensure the safety and stability of the transformer in actual operation. The main contents include: Electrical performance test: including no-load voltage test, load loss test, short-circuit impedance measurement, etc., to ensure that the electrical performance of the transformer meets the design requirements. Temperature rise test: Under rated load conditions, measure the temperature of the transformer oil and windings to ensure that it does not exceed the safe temperature range during normal operation. Oil quality inspection: Detect the quality of the transformer oil, including insulation strength, water content, etc., to ensure that the quality of the oil meets the standards. Noise test: Test the noise level of the transformer during operation to ensure that it meets the relevant noise control requirements.
Routine Test - Insulation Power Factor
Purpose of Testing
The purpose of testing the insulation power factor is to evaluate the dielectric loss of the insulation system in electrical equipment, and to determine whether issues such as moisture ingress, aging, or contamination are present. A high power factor value usually indicates insulation deterioration.
Testing Equipment
Insulation power factor tester (e.g., brands like Doble, Megger) Voltage source (typically 1 kV, 2.5 kV, or 10 kV or as the customer request standard) Temperature and humidity meter (for recording environmental conditions)
Pre-Test Preparation
De-energize tap changer the equipment and ensure it has been properly grounded and discharged. Make sure the bushings and terminal connections to prevent surface contamination from affecting test results. Perform the test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20–30°C).
Test Progress
Connect the Test Instrument: Connect the test equipment to the bushings or terminals of the equipment under test and ensure proper grounding. Apply Test Voltage: Select the appropriate test voltage according to the rated voltage of the equipment (e.g., 25 kV for high-voltage windings or as the request of the pad mounted transformer).
Measure and Record
Start the test and record the following parameters: Capacitive current (IC) Power current (IW) Power factor (PF) or dissipation factor (Tanδ) Capacitance Ambient temperature and humidity at the time of testing
Temperature Correction
Correct the measured power factor to the reference temperature (typically 20°C) for accurate evaluation.
Repeat Testing (if necessary)
Measure different windings (high-voltage, medium-voltage, low-voltage) and bushings separately for comparative analysis.
Evaluation Criteria (Reference)
Insulation power factor ≤ 0.5% (Excellent) 0.5% < Power factor ≤ 1% (Good) 1% (Further inspection or corrective action required)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Ideal for medium to large commercial buildings, office parks, retail centers, schools, hospitals, and light-to-medium manufacturing facilities requiring reliable step-down from medium-voltage utility feed to 480V or 208V. Also suits suburban/urban distribution networks with underground or overhead feeds, delivering safe, low-maintenance power in moderate to high-traffic locations.
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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