25kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
25 kVA Completely self-protected(CSP) Single Phase pole Mounted transformer is an efficient and reliable power equipment designed for small and medium-sized power needs. It is widely used in power distribution systems in residential areas, commercial areas, and small industrial facilities. The transformer adopts fully self-protection technology and has built-in multiple protection functions such as overload, short circuit, overvoltage, etc. to ensure automatic power failure under abnormal conditions, avoid equipment damage, and improve system safety. High-quality manufacturing materials and reliable performance ensure its long-term stable operation, reduce energy waste, and improve power supply efficiency.
- Primary Voltage Ratings 2.4-34.5kV
- Secondary Voltage Ratings 480-240/240-120 or customized
- H.V. Tap Range ± 2×2.5% HV taps or others
- Type Completely self-protected(CSP) Type
- BIL 30-150kV
- Standards IEEE, ANSI, IEC, CSA, NEMA
- Application Residential Areas， Commercial Buildings，Small Industrial Facilities
- Power Rating 25kVA
- Certificate CE, ISO, UL
- Cooling Method ONAN
- Oil Minerial Oil or FR3
- Opeartion Step Down
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
25kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
Technical Specifications
Accessories
| Rated Power | 25 kVA |
| Rating Primary Voltage | 12.4-34.5kV |
| Secondary Voltage | 480-240V 240-120V 277V Customized |
| Frequency | 50/60Hz |
| Vector Group | Ii0,Ii6 |
| 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 | 45 kg |
| Total Weight | 258 kg |
| Outline Dimensions（W×D×H） | 560×590×935 (mm) |
| Lifting Lug |
| Tap Changer |
| Pressure Relief Valve |
| Tank Cover and clamp |
| L.V Bushing |
| HV Bushing |
| Ground Strap |
| Nameplate |
| Non-PCB decal |
| High Voltage Warning Signs |
| Support lug |
| Oil fill valve |
| Surge arrester |
| Secondary breaker |
| Weak link |
Customization Optional
25kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
NPC ELECTRIC's Completely Self-Protected (CSP) Single-Phase Pole-Mounted Transformers offer a range of customizable features to meet diverse operational needs.
The optional specifications for the 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer offer various customization options to meet specific operational and environmental requirements.
These options may include different input voltage levels, such as 11kV or 13.8kV, to match the local grid specifications. The output voltage can be customized for specific needs, typically providing 230V or 400V configurations.
The optional specifications for the 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer offer various customization options to meet specific operational and environmental requirements.
These options may include different input voltage levels, such as 11kV or 13.8kV, to match the local grid specifications. The output voltage can be customized for specific needs, typically providing 230V or 400V configurations.
Additionally, customers can choose enhanced protection features, such as advanced surge protection, temperature monitoring, or remote monitoring capabilities for real-time performance tracking and fault detection.
For installations in harsh environmental conditions, options like corrosion-resistant coatings, weatherproof enclosures, or specialized insulation materials can be selected to ensure durability and long-term reliability.
These optional specifications provide flexibility for adapting the transformer to a wide range of applications and operating environments.
For installations in harsh environmental conditions, options like corrosion-resistant coatings, weatherproof enclosures, or specialized insulation materials can be selected to ensure durability and long-term reliability.
These optional specifications provide flexibility for adapting the transformer to a wide range of applications and operating environments.
Packing and Shipping
25kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
NPC ELECTRIC single-phase 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 the 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer is designed to ensure safe transportation and protection during transit. Once the transformer is fully assembled and inspected, it is carefully packaged in a durable wooden crate or steel frame to safeguard it from external damage. Inside the crate, the transformer is secured with shock-absorbing materials such as foam padding, wooden supports, or bubble wrap to prevent any movement and protect it from vibrations or impacts during handling and transportation.
To further protect the transformer from environmental elements like moisture or dust, the package is wrapped in a moisture-resistant plastic sheet or protective coating. Clear labels indicating handling instructions such as "Keep Dry," "This Side Up," and "Fragile" are placed on the exterior to guide the handling team during transportation. Additionally, the transformer is mounted securely on a pallet for stability.
Depending on the destination, the transformer is shipped by road, rail, or sea freight, and is tracked during transit to ensure timely delivery and minimize risks of delays or damages. Upon arrival at the destination, the packaging is inspected for any signs of damage before the transformer is unpacked and checked to ensure it is in proper condition for installation and use.
This careful packing and shipping process ensures that the 25kVA CSP Single Phase Pole Mounted Transformer arrives safely and is ready for deployment in the field.
For this purpose, the packing and shipping process for the 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer is designed to ensure safe transportation and protection during transit. Once the transformer is fully assembled and inspected, it is carefully packaged in a durable wooden crate or steel frame to safeguard it from external damage. Inside the crate, the transformer is secured with shock-absorbing materials such as foam padding, wooden supports, or bubble wrap to prevent any movement and protect it from vibrations or impacts during handling and transportation.
To further protect the transformer from environmental elements like moisture or dust, the package is wrapped in a moisture-resistant plastic sheet or protective coating. Clear labels indicating handling instructions such as "Keep Dry," "This Side Up," and "Fragile" are placed on the exterior to guide the handling team during transportation. Additionally, the transformer is mounted securely on a pallet for stability.
Depending on the destination, the transformer is shipped by road, rail, or sea freight, and is tracked during transit to ensure timely delivery and minimize risks of delays or damages. Upon arrival at the destination, the packaging is inspected for any signs of damage before the transformer is unpacked and checked to ensure it is in proper condition for installation and use.
This careful packing and shipping process ensures that the 25kVA CSP Single Phase Pole Mounted Transformer arrives safely and is ready for deployment in the field.
32
32 years of industry experience
Manufacturer Test
25kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
Progress Test
NPC Electric manufactures pad-mounted transformers the strict quality control.
The progress test for the 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer is conducted during the manufacturing process to ensure the transformer meets all required performance and safety standards. This includes testing the electrical characteristics such as input and output voltage levels, load capacity, and the functionality of the built-in protection systems like overcurrent, short-circuit, and overload protection. Insulation resistance and dielectric strength tests are also carried out to verify the transformer’s electrical integrity and reliability. The progress test ensures that all components are functioning as expected and that the transformer will operate safely and efficiently once fully assembled, meeting both quality standards and customer requirements before moving to the final factory acceptance testing stage.
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
♦ 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
NPC Electric will have 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.
The Transformer Factory Acceptance Test (FAT) for the 25kVA Completely Self-Protected (CSP) Single Phase Pole Mounted Transformer is a comprehensive procedure conducted before the transformer is shipped to the customer. During the FAT, the transformer undergoes a series of tests to ensure it meets all design specifications and operational standards. These tests include verifying the input and output voltages, load performance, and the functionality of the built-in protection systems, such as overcurrent, short-circuit, and overload protection. Additionally, insulation resistance and dielectric strength tests are performed to confirm the transformer's electrical safety. The self-protection system is also tested to ensure it will automatically disconnect the transformer in case of faults. Successful completion of the FAT ensures that the transformer is fully operational, safe, and ready for installation, meeting all required quality standards.
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). Calibrate and inspect the test instruments to ensure they are in good working condition.
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) Test standard:IEEE C57.12.00 & IEEE C57.12.90 (Liquid-Immersed)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Residential Areas， Commercial Buildings， Small Industrial Facilities
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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