30kVA Dry Type Transformer
The 30kVA Dry type transformer complies with ANSI, CSA, NEMA, IEEE, IEC, GB, and DOE standards. NPC ELECTRIC manufactures dry-type transformers in strict accordance with the highest industry and international standards. The 30kVA dry-type transformer provides dependable, oil-free power transformation for indoor environments, stepping down primary voltages such as 480V Delta, 600V, 11kV, or 10kV to secondary outputs like 208Y/120V, 480Y/277V, or 400Y/230V in three-phase configurations.
- 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 Dry type transformer
- BIL 30/95kV
- Standards IEEE, ANSI, NEMA,IEC,GB
- Application commercial centers, theaters, hospitals, hotels
- Power Rating 30kVA
- Certificate UL ,CESI
- Cooling Method OA/OF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
30kVA Dry Type Transformer
Technical Specifications
Accessories
| Rated Power | 30 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 | |
| Enclosure material | 304 Stainless Steel | |
| Total Weight | 150 kg | |
| Outline Dimensions（L×W×H）in. | 500×400×800（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
30kVA Dry Type Transformer
Configure the 30kVA dry type transformer to precisely match indoor application demands with versatile options that enhance safety, efficiency, and integration. Primary voltage ranges cover low-voltage (240V-600V) or medium-voltage (6.6kV-11kV), including Delta or Wye connections, while secondary voltages support 208Y/120V, 480Y/277V, 400Y/230V, or custom configurations for specific load requirements. Winding materials allow aluminum for economical lightweight designs or copper for superior conductivity and thermal performance in high-duty cycles. Insulation systems offer Class F (155°C) for standard use or Class H (180°C) for elevated ambient temperatures, with temperature rise options of 150°C, 115°C, or 80°C for energy savings. Enclosure types include IP00 open ventilated, IP23 drip-proof, or IP54/IP55 enclosed with forced ventilation for dusty or humid environments. Additional features such as K-factor ratings (K4-K13) handle harmonic loads, forced air cooling (AF) for overload capability, or integrated PT100/thermocouple sensors for remote monitoring. These customizations optimize thermal management, noise reduction, and environmental adaptability, delivering a fire-safe, compliant transformer tailored for commercial and institutional power needs.
Further personalization includes enclosure finishes with anti-corrosion paints for coastal or chemical exposure, reinforced mounting bases for seismic zones, or accessory integrations like surge protection devices, harmonic filters, and digital temperature controllers. Core designs minimize no-load losses further, while low-noise fans and acoustic barriers suit sensitive locations. These extensive options make the 30kVA dry type transformer a highly adaptable, maintenance-free solution, ensuring regulatory compliance, reduced operational costs, and dependable performance in indoor distribution systems for offices, healthcare facilities, educational institutions, and light industrial settings.
Packing and Shipping
30kVA Dry Type Transformer
NPC ELECTRIC’s dry-type transformers are meticulously packaged for secure sea freight and long-distance transport, ensuring they arrive at their destination in perfect condition and ready for installation. For a 30kVA dry-type transformer, the packing and shipping process is carefully engineered to minimize the risk of damage during transit.
Each transformer is enclosed in a durable, weather-resistant wooden crate or steel-reinforced container, with internal cushioning materials such as high-density foam or shock-absorbing padding to protect against vibration, impact, and shifting. The packaging is designed to shield the transformer from moisture, dust, and other environmental factors that could compromise performance.
During shipping—whether by road, rail, or sea—the transformer is securely fastened to a pallet or transport platform using heavy-duty straps or tie-downs to prevent movement. Clear handling instructions, safety warnings, and directional indicators are prominently displayed on the packaging to ensure proper handling by logistics personnel.
All necessary shipping documentation is provided, including customs clearance paperwork, certificates of origin, and any required permits, ensuring full compliance with international transport regulations. Upon delivery, a thorough visual inspection is conducted to verify the transformer's integrity before installation.
This comprehensive packing and shipping process guarantees that the 30kVA dry-type transformer arrives safely and in optimal working condition, ready for reliable, long-term operation.
Environmental considerations drive packing choices, using recyclable timber and optimized crate designs to reduce carbon footprint. Impact and tilt recorders attached to crates record transit conditions, supporting post-arrival inspections and claims if required. Accessories such as sensors, fans, or enclosures ship separately with detailed checklists for onsite verification. Specialized carriers experienced in dry-type electrical equipment obtain necessary permits and follow rigorous safety protocols across road, rail, and sea routes.
Upon arrival, comprehensive support includes site preparation advice, unpacking guidelines, terminal connection torque specifications, and commissioning recommendations. This end-to-end logistics strategy safeguards transformer integrity, minimizes installation delays, and ensures rapid deployment in indoor power distribution projects worldwide.
Each transformer is enclosed in a durable, weather-resistant wooden crate or steel-reinforced container, with internal cushioning materials such as high-density foam or shock-absorbing padding to protect against vibration, impact, and shifting. The packaging is designed to shield the transformer from moisture, dust, and other environmental factors that could compromise performance.
During shipping—whether by road, rail, or sea—the transformer is securely fastened to a pallet or transport platform using heavy-duty straps or tie-downs to prevent movement. Clear handling instructions, safety warnings, and directional indicators are prominently displayed on the packaging to ensure proper handling by logistics personnel.
All necessary shipping documentation is provided, including customs clearance paperwork, certificates of origin, and any required permits, ensuring full compliance with international transport regulations. Upon delivery, a thorough visual inspection is conducted to verify the transformer's integrity before installation.
This comprehensive packing and shipping process guarantees that the 30kVA dry-type transformer arrives safely and in optimal working condition, ready for reliable, long-term operation.
Environmental considerations drive packing choices, using recyclable timber and optimized crate designs to reduce carbon footprint. Impact and tilt recorders attached to crates record transit conditions, supporting post-arrival inspections and claims if required. Accessories such as sensors, fans, or enclosures ship separately with detailed checklists for onsite verification. Specialized carriers experienced in dry-type electrical equipment obtain necessary permits and follow rigorous safety protocols across road, rail, and sea routes.
Upon arrival, comprehensive support includes site preparation advice, unpacking guidelines, terminal connection torque specifications, and commissioning recommendations. This end-to-end logistics strategy safeguards transformer integrity, minimizes installation delays, and ensures rapid deployment in indoor power distribution projects worldwide.
32
32 years of industry experience
Manufacturer Test
30kVA Dry Type Transformer
Progress Test
NPC Electric manufactures high-quality three-phase dry-type transformers under strict quality control protocols. During production, a comprehensive Progress Test is conducted on each 30kVA unit to ensure full compliance with design specifications and quality standards. This process includes verification of core insulation, winding resistance, and dielectric strength. Key electrical components such as bushings, tap changers, and protection devices are also tested to confirm proper functionality. The transformer’s ability to withstand operational loads and voltage fluctuations is thoroughly assessed. Any deviations or issues identified are promptly addressed before proceeding to final testing. These rigorous progress tests ensure that every dry-type transformer delivered is safe, reliable, and fully prepared for real-world operation, while meeting all relevant industry standards.
Design Tests
All transformers will be tested after finishing the production, test items as follows:
♦ Insulation Power Factor
♦ 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)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
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 30kVA three-phase dry-type 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.
These comprehensive tests ensure that each 30kVA dry-type transformer is safe, reliable, and fully compliant with industry standards, providing peace of mind before delivery and installation.
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)
Test standard
IEEE C57.12.01 & IEEE C57.12.91 (Dry-Type)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Highly effective for institutional facilities paired with healthcare and educational environments, this 30kVA dry type transformer powers medical equipment, classrooms, laboratories, and data rooms, providing reliable, low-noise, maintenance-free three-phase power in hospitals, schools, and cleanroom settings.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
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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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