800kVA Dry Type Transformer
NPC ELECTRIC 800kVA Dry-Type Transformer provides reliable, oil-free power distribution with a compact design. Featuring advanced insulation and cooling systems, it ensures safe, low-maintenance operation for industrial and commercial use. With 800kVA capacity, it delivers efficient and environmentally friendly performance. Its dry-type ventilated or encapsulated construction supports zero fluid maintenance, eliminates leak/spill concerns, and fits seamlessly into high-load, high-traffic, or environmentally restricted spaces. It targets efficiencies approximately 99.36–99.38% at 35% load (consistent with DOE 2029 levels for higher kVA ranges in low-voltage dry-type category), manages harmonics robustly, accommodates overloads, and provides exceptional reliability with minimized lifecycle costs and environmental benefits.
- 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 power distribution, commercial buildings
- Power Rating 800kVA
- 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
800kVA Dry Type Transformer
Technical Specifications
Accessories
| Rated Power | 800 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 | 3550 kg | |
| Outline Dimensions（L×W×H）in. | 1850×1560×2200（mm) | |
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
800kVA Dry Type Transformer
Our transformers offer a range of core features designed to meet diverse application needs and ensure reliable performance. The 800kVA Dry-Type Transformer offers efficient, oil-free power distribution with a robust design. Key features include advanced insulation for enhanced safety, low noise operation, and minimal maintenance. Its compact size is ideal for industrial and commercial applications, providing reliable, environmentally friendly, and cost-effective performance. Customize the 800kVA dry type transformer extensively to align with specific voltage, environmental, and performance criteria for complex power infrastructures. Primary voltages range from 208V to 600V in delta or wye configurations (e.g., 480V Delta, 240/480V dual-voltage, 600V), secondary voltages include 208Y/120V, 480Y/277V, 240/120V, or bespoke low-voltage outputs, with vector groups such as Dyn11 or Delta-Wye to facilitate optimal grounding, phase coordination, and harmonic suppression.
Additional capabilities include forced-air fans for extended overload handling, integrated primary/secondary circuit breakers, surge arresters, digital temperature/condition monitoring with alarms, SCADA compatibility, low-noise optimizations, seismic reinforcements (OSHPD-compliant), 50/60Hz dual frequency, or tailored impedance. All custom designs receive in-depth engineering evaluation to ensure compliance with IEEE, ANSI, NEMA, UL, CSA, and DOE efficiency standards (2029-amended with 20% loss reduction for three-phase low-voltage dry-type), delivering reduced no-load/load losses, impedance optimization (typically 3-7%), heightened safety, and lower total ownership costs in high-demand or space-limited environments.
Packing and Shipping
800kVA 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.
The 800kVA Dry-Type Transformer is packed and shipped with the utmost care to ensure safe delivery and protection during transit. The transformer is first securely wrapped in moisture-resistant plastic or film to protect it from dust, dirt, and moisture.
It is then placed on a robust wooden pallet or inside a custom-built wooden crate, designed to offer optimal support and prevent any damage during handling. To ensure stability, shock-absorbing materials such as foam, bubble wrap, or wooden supports are added to cushion the transformer and protect it from impacts or vibrations.
The unit is clearly labeled with shipping marks, including details like weight, dimensions, and specific handling instructions to ensure proper care throughout the transport process.
The transformer is shipped using reliable, experienced logistics providers who adhere to international shipping standards.
Upon arrival, the packaging is carefully removed, and the transformer is thoroughly inspected for any signs of damage before installation.
At destination, comprehensive installation instructions detail safe lifting (using designated points), placement ensuring ventilation clearances, grounding, connection torque specifications, and pre-energization procedures (insulation resistance, turns ratio verification). Customs support provides commercial invoices, packing lists, certificates of origin, efficiency certifications, and test reports for expeditious clearance. Pre-shipment third-party or customer witness inspections can be coordinated for added confidence. Our logistics prioritize regulatory adherence, risk mitigation, and delivery of a transformer primed for efficient, secure commissioning.
The 800kVA Dry-Type Transformer is packed and shipped with the utmost care to ensure safe delivery and protection during transit. The transformer is first securely wrapped in moisture-resistant plastic or film to protect it from dust, dirt, and moisture.
It is then placed on a robust wooden pallet or inside a custom-built wooden crate, designed to offer optimal support and prevent any damage during handling. To ensure stability, shock-absorbing materials such as foam, bubble wrap, or wooden supports are added to cushion the transformer and protect it from impacts or vibrations.
The unit is clearly labeled with shipping marks, including details like weight, dimensions, and specific handling instructions to ensure proper care throughout the transport process.
The transformer is shipped using reliable, experienced logistics providers who adhere to international shipping standards.
Upon arrival, the packaging is carefully removed, and the transformer is thoroughly inspected for any signs of damage before installation.
At destination, comprehensive installation instructions detail safe lifting (using designated points), placement ensuring ventilation clearances, grounding, connection torque specifications, and pre-energization procedures (insulation resistance, turns ratio verification). Customs support provides commercial invoices, packing lists, certificates of origin, efficiency certifications, and test reports for expeditious clearance. Pre-shipment third-party or customer witness inspections can be coordinated for added confidence. Our logistics prioritize regulatory adherence, risk mitigation, and delivery of a transformer primed for efficient, secure commissioning.
32
32 years of industry experience
Manufacturer Test
800kVA Dry Type Transformer
Progress Test
During 800kVA dry type transformer fabrication, core flux density validation optimizes magnetic efficiency to curtail hysteresis and eddy current losses. Impregnation/varnish progress tracks thorough penetration and cure for elevated dielectric performance. Lead routing/clearance inspections adhere to creepage/distances per insulation class. Initial post-assembly low-voltage excitation and insulation tests validate overall robustness. Enclosure checks gauge paint thickness, grounding paths, and assembly fit. Functional progress cycles tap changers, optional fans, and alarm systems repeatedly for assured operation. Pre-final audits confirm nameplate accuracy, labeling, and structural readiness. Cumulative progress testing facilitates prompt corrective measures, establishing reliability for advancement to full factory acceptance and prolonged low-maintenance field performance.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ 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
Induced potential test at double frequency stresses inter-turn insulation with partial discharge monitoring for defect-free execution. No-load loss/excitation current at rated voltage validates core efficiency against DOE 2029 levels (~99.36%+ at 35% load interpolated). Impedance/load loss at rated current quantifies percent Z, copper losses, and regulation for coordination. Optional witnessed heat run verifies temperature rise limits. Sound level measurement confirms NEMA adherence. Functional operations cycle taps, fans (if equipped), and monitoring/alarm features. Certified reports with traceable calibration and optional customer witnessing document parameters, confirming exceptional efficiency, dielectric strength, safety, and readiness for dependable deployment.
Routine Test - Insulation Power Factor
Purpose of Testing
The purpose of winding resistance testing is to detect the continuity and connection quality of the internal conductors of the motor or transformer windings, and to promptly detect potential faults such as open circuits, poor contact or local heating.
Testing Equipment
Winding resistance tester (e.g. OMICRON, DV Power, Raytech, Megger, ISA, etc.)
Test voltage source (commonly used are 6V, 10V, 20V, 40V or 100V, depending on the equipment model or customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test)
Test voltage source (commonly used are 6V, 10V, 20V, 40V or 100V, depending on the equipment model or customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test)
Pre-Test Preparation
Check if the instrument has been calibrated to ensure the test accuracy.
Disconnect the electrical connection between the test cable and the equipment to ensure that there is no external current or voltage interference.
Select a suitable voltage range for testing and set the test voltage according to the equipment requirements.
Disconnect the electrical connection between the test cable and the equipment to ensure that there is no external current or voltage interference.
Select a suitable voltage range for testing and set the test voltage according to the equipment requirements.
Test Progress
Connect the Test Instrument:
Connect the test equipment to the winding terminals of the device under test, making sure the connections are secure and properly grounded to avoid measurement errors.
Apply Test Voltage:
Select the appropriate test current according to the equipment specifications (such as test current for low-voltage windings, single-phase or three-phase windings).
Connect the test equipment to the winding terminals of the device under test, making sure the connections are secure and properly grounded to avoid measurement errors.
Apply Test Voltage:
Select the appropriate test current according to the equipment specifications (such as test current for low-voltage windings, single-phase or three-phase windings).
Measure and Record
Start the test and record the following parameters:
Winding resistance (usually expressed in units of "Ω")
Test current (A)
Test voltage (V)
Temperature (record the winding temperature before and after the test)
Winding resistance (usually expressed in units of "Ω")
Test current (A)
Test voltage (V)
Temperature (record the winding temperature before and after the test)
Temperature Correction
The measured winding resistance values are converted to a reference temperature (usually 20°C) based on a temperature correction formula to allow accurate evaluation and comparison.
Repeat Testing (if necessary)
Test the different windings (high voltage, medium voltage, low voltage) separately and make sure to record the resistance value of each winding.
Evaluation Criteria (Reference)
Resistance deviation is less than 5% (normal)
Resistance deviation is between 5% and 10% (warning)
Resistance deviation exceeds 10% (further inspection or corrective action is required)
Resistance deviation is between 5% and 10% (warning)
Resistance deviation exceeds 10% (further inspection or corrective action is 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
Perfect for expansive commercial developments, high-rise offices, large retail centers, universities, and hospitals needing substantial indoor power transformation without oil hazards. Also ideal for heavy industrial facilities, manufacturing plants, and processing operations with high loads, providing efficient 480V to 208Y/120V step-down, reduced noise, and superior fire safety in populated or ventilated settings.
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
7500kVA Dry Type Transformer
7500kVA Dry Type Transformer is a high-capacity, reliable power solution designed for large-scale industrial and commercial applications. With a robust 7500kVA rating, it incorporates advanced dry-type insulation technology, ensuring enhanced safety, minimal maintenance, and exceptional durability. Engineered for demanding environments, this transformer delivers stable, efficient, and low-noise operation while reducing environmental impact. The NPC ELECTRIC 7500kVA Dry Type Transformer is the ideal choice for high-power applications, providing secure and continuous power distribution for critical infrastructure. Typical attributes encompass three-phase construction, primary voltages 208V–600V (e.g., 480V Delta, 600V Delta), secondary voltages such as 208Y/120V, 480Y/277V, or custom, aluminum or copper windings, 150°C rise (standard) or 115°C/80°C with 220°C insulation class, ±2×2.5% primary taps, NEMA 1 ventilated enclosure (NEMA 3R/encapsulated options), natural convection cooling (AN), electrostatic shielding, and low sound levels per NEMA.
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. Primary voltages range from 2.4kV to 34.5kV (common: 34.5kV, 24.94kV, 13.8kV, 13.2kV, 12.47kV, 4.16kV) in delta or grounded wye configurations with BIL up to 200kV.
50kVA Completely self-protected(CSP) Single Phase Pole Mounted Transformer
50kVA Completely self-protected(CSP) Single Phase pole Mounted transformer is a robust, high-efficiency solution designed for reliable single-phase power distribution in residential, commercial, and small industrial applications. This transformer features built-in protection mechanisms, including overload, short-circuit, and over-voltage safeguards, ensuring automatic disconnection during fault conditions to protect both the transformer and the electrical system. With its pole-mounted design, it is space-efficient and ideal for installations in urban, rural, and remote areas. The transformer operates with low losses, ensuring high energy efficiency and long-term performance. Built with durable materials, it offers exceptional resilience against harsh weather conditions, ensuring reliability and longevity. This transformer is an ideal choice for any application requiring consistent, stable single-phase power.
167kVA Single Phase Pad Mounted Transformer
The 167kVA single phase pad mounted transformer is engineered for higher-capacity underground residential and light commercial distribution, efficiently transforming primary voltages such as 12470GrdY/7200, 24940GrdY/14400, 34500GrdY/19920, or dual-voltage configurations to secondary 120/240V split-phase or 240V outputs. Constructed with premium grain-oriented silicon steel cores and aluminum or copper windings, it delivers exceptional energy efficiency and minimal losses while fully complying with DOE 2016 standards and IEEE/ANSI C57.12.34 specifications.
1600kVA Three Phase Pad Mounted Transformer
The 1600kVA Three Phase Pad Mounted Transformer is a robust, liquid-immersed, self-cooled distribution transformer designed for reliable underground power delivery in high-demand environments. Built to exceed IEEE C57.12.34, ANSI C57.12.00, DOE 2016 efficiency standards, and CSA C802.3 requirements, this UL-listed compartmental-type unit features dead-front high-voltage bushings (200A loadbreak inserts), loop-feed or radial configurations, and a fully sealed tank with mineral oil or eco-friendly FR3 fluid options.Suitable for primary voltages like 12.47kV, 13.8kV, 24.94kV, or 34.5kV to secondary 480Y/277V or 208Y/120V, it provides overload capability, low maintenance, and enhanced fire safety for modern grid integration.
Solar Transformer
NPC ELECTRIC specializes in the design and production of high-performance Solar Step-up Transformers for photovoltaic (PV) applications, offering a wide range of transformer types to meet diverse installation and operational needs. Our product portfolio includes Dry Type Transformers for indoor or fire-sensitive environments, Pad Mounted Transformers for compact and secure outdoor use, Oil-Immersed Transformers known for their reliability and thermal performance, and Prefabricated Substation Transformers that integrate seamlessly into modular substation systems. Each solution is engineered to support efficient voltage step-up from inverter output to medium voltage grid levels, ensuring safe and stable energy transmission. In addition to standard models, NPC ELECTRIC provides customized solutions, including dual-split (Double-Split Winding) transformer designs that are particularly advantageous for high-capacity systems, difficult logistics, or site limitations, enabling easier transport and installation without compromising performance. The Transformer must comply with international standards such as IEC, ANSI, and IEEE. Backed by advanced manufacturing capabilities and strict quality control.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