22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer, a premium oil-free solution engineered for safe, reliable medium-voltage power distribution in indoor environments. This three-phase cast resin transformer features fully vacuum-impregnated epoxy resin windings with high-conductivity copper conductors and premium low-loss grain-oriented silicon steel cores, achieving superior energy efficiency (typically 98.5%+), significantly reduced no-load and load losses, and excellent partial discharge performance (<10pC). The advanced cast resin encapsulation provides outstanding moisture resistance, self-extinguishing fire safety (F1 class), robust short-circuit withstand capability, and completely maintenance-free operation. Natural air (AN) cooling with optional forced air (AF) upgrades supports high overload capacity, while optimized core clamping, vibration-dampening mounts, and noise-reduction design deliver low acoustic levels suitable for urban or sensitive installations.
- Primary Voltage Ratings 22 kV (22000 V) delta or grounded wye
- Secondary Voltage Ratings 0.4 kV (400/230 V) wye or custom
- 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 office buildings, transportation facilities
- Power Rating 30kVA - 7500kVA
- Certificate IEC 60076-11, IEC 60076-1, IEC 60076-3, UL 1561
- Cooling Method OA/OF
- Opeartion Step Down & Step Up
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer
Technical Specifications
Accessories
| Rated Power | 30kVA - 7500 kVA | |
| Rating Primary Voltage | 22kV | |
| 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 | |
|
Temperature rise |
100°C or 120°C (Class F/H) |
|
|
Insulation system |
Class F (155°C) or Class H (180°C) rise |
|
| HV Bushing |
| LV Bushing |
| Tap changer connector |
| Lifting hook for complete transformer |
| Name plate |
Customization Optional
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer
The 22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer supports extensive customization to meet precise project specifications, environmental conditions, and grid requirements in indoor medium-voltage applications. Primary voltage is standard at 22kV (with 20kV, 22.9kV, or 24kV variants available), while secondary voltages include 0.4kV, 0.415kV, 0.69kV, or custom low-voltage outputs. Copper windings are standard for maximum conductivity and thermal endurance; aluminum options reduce weight and cost where suitable. Tap changers offer off-circuit ±2×2.5% to ±10% for basic regulation, or advanced on-load tap changers (OLTC) with multiple steps for automatic voltage control in fluctuating networks. Insulation class upgrades to Class H (180°C) and low-temperature-rise designs (80K/100K) accommodate higher ambients or continuous overload. Cooling enhancements include forced air (AF) fans or ducted systems for 40-50% capacity increase, with enclosure protection from IP00 open to IP54/IP55 dust/water-resistant designs featuring filters or louvers.
Additional tailoring includes vector groups (Dyn11 standard, Yyn0, Dyn5, or custom) for harmonic mitigation and parallel operation, integrated fiber-optic temperature monitoring, partial discharge sensors, Modbus/Ethernet smart interfaces for predictive maintenance, electrostatic shielding, anti-vibration isolators reducing noise below 60-65dB, and specialized resin formulations for enhanced fire behavior or chemical resistance. Seismic qualification, marine-grade coatings, and high-current bushings support demanding installations. These factory-direct customizations ensure optimal efficiency and adaptability, making the transformer highly visible in searches for "custom 22kV cast resin dry type distribution transformers."
Packing and Shipping
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer
Packaging the 22kV Cast Resin Dry Type Transformer is engineered to protect the vacuum-cast windings, core, and accessories during heavy-duty transport. The unit is rigidly secured to a reinforced wooden pallet with steel cross-bracing, anti-vibration isolators, and high-strength lifting trunnions. Terminals, bushings, sensors, and fragile components receive custom-molded foam cradles and rigid protective covers. The complete assembly is wrapped in thick multi-layer moisture-proof film, anti-static sheeting, and reinforced edge guards. A purpose-built, ISPM 15-compliant heavy-duty wooden crate or open steel frame fully encloses the transformer, incorporating internal supports, active desiccant systems, humidity indicators, and multi-axis electronic shock & tilt recorders to document handling and preserve dry-type integrity.
Shipping is tailored for secure global delivery of this medium-voltage cast resin unit. Ocean freight in dedicated 40ft open-top or flat-rack containers with custom cradles and certified multi-point lashing provides economical transport (typically 25-65 days to international ports). Air charter services expedite critical components in 7-16 days. Overland transport uses specialized low-loader trailers with hydraulic suspension, escorts, and pre-approved heavy-haul routes for domestic/regional movements.
Comprehensive export documentation—including commercial invoices, dimensional/weight manifests, origin certificates, test reports, and IEC compliance—is prepared for rapid customs clearance. Sustainable practices incorporate reusable skids, optimized container loading, and carbon-offset options where available. Clients benefit from secure tracking portals with real-time satellite positioning, ETA forecasts, and dedicated logistics support.
Post-arrival services include optional heavy-lift crane or SPMT offloading coordination, condition assessment, insulation verification, and packaging recycling to accelerate commissioning. Multi-unit orders leverage consolidated shipments and phased delivery scheduling. This professional logistics framework guarantees flawless delivery, enhancing visibility for "secure 22kV dry type transformer shipping."
Shipping is tailored for secure global delivery of this medium-voltage cast resin unit. Ocean freight in dedicated 40ft open-top or flat-rack containers with custom cradles and certified multi-point lashing provides economical transport (typically 25-65 days to international ports). Air charter services expedite critical components in 7-16 days. Overland transport uses specialized low-loader trailers with hydraulic suspension, escorts, and pre-approved heavy-haul routes for domestic/regional movements.
Comprehensive export documentation—including commercial invoices, dimensional/weight manifests, origin certificates, test reports, and IEC compliance—is prepared for rapid customs clearance. Sustainable practices incorporate reusable skids, optimized container loading, and carbon-offset options where available. Clients benefit from secure tracking portals with real-time satellite positioning, ETA forecasts, and dedicated logistics support.
Post-arrival services include optional heavy-lift crane or SPMT offloading coordination, condition assessment, insulation verification, and packaging recycling to accelerate commissioning. Multi-unit orders leverage consolidated shipments and phased delivery scheduling. This professional logistics framework guarantees flawless delivery, enhancing visibility for "secure 22kV dry type transformer shipping."
32
32 years of industry experience
Manufacturer Test
22kV Dry Type Transformer Cast Resin Three Phase Distribution Transformer
Progress Test
Progress tests for the 22kV cast resin dry type transformer are conducted at every critical manufacturing stage to ensure material quality and specification conformance. Core lamination stacking is inspected for precise alignment, clamp pressure uniformity, and inter-lamination insulation integrity to minimize no-load losses and audible noise. Winding fabrication progress verifies exact turn counts using automated counters, consistent conductor tension, correct transposition, and adequate insulation thickness between layers for balanced impedance and thermal distribution. After core-coil assembly, preliminary DC resistance, turns ratio, polarity, and inductance measurements are taken to confirm correct phasing, no shorted turns, and electrical symmetry before encapsulation. Cast resin encapsulation progress monitors resin mixing ratios, vacuum pressure levels, curing temperature profiles, and partial discharge testing during cure to ensure void-free insulation. Enclosure assembly checks verify fit-up, ventilation openings (if ventilated), grounding continuity, and surface preparation for paint adhesion. These incremental checks enable early identification and correction of nonconformities, ensuring the finished transformer meets efficiency, dielectric, and reliability targets.
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
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
Transformer Factory Acceptance Test
Factory acceptance testing (FAT) for the 22kV cast resin dry type transformer strictly follows IEC 60076-11, IEEE C57.12.91, and UL 1561 protocols to confirm full compliance before shipment. Routine visual and mechanical inspections verify enclosure finish, weld quality (if applicable), nameplate data accuracy, accessory mounting, and terminal tightness. Winding resistance is measured across all tap positions at reference temperature to confirm conductor uniformity and match calculated loss values. Turns ratio (TTR) testing is performed on every tap to ensure ratio accuracy within 0.5% and correct vector group alignment. Polarity and phase relation checks confirm proper connection. Insulation resistance (megger at 2500–5000 V) evaluates winding-to-winding and winding-to-ground paths for multi-gigohm readings. Applied potential withstand test applies one-minute power-frequency voltage to HV and LV separately per insulation class without breakdown or excessive corona. Induced voltage test at double frequency stresses inter-turn and layer insulation with sensitive partial discharge monitoring to confirm corona-free operation.
Routine Test - DC Insulation Resistance Test
Purpose of Testing
The purpose of DC insulation resistance testing is to measure the insulation resistance of a device by applying a DC voltage, thereby evaluating the health of the insulation material and the voltage withstand capability of the electrical device. This test helps detect potential insulation aging, moisture or damage, preventing electrical failures in the device.
Testing Equipment
Insulation resistance tester (e.g. Megger, Fluke, Hioki, Klein Tools, etc.)
Voltage source (usually 500V, 1000V, 2500V, or customized according to customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test to ensure that the test conditions meet the standard requirements.)
Voltage source (usually 500V, 1000V, 2500V, or customized according to customer requirements)
Temperature and humidity meter (used to record the ambient temperature and humidity during the test to ensure that the test conditions meet the standard requirements.)
Pre-Test Preparation
Make sure the device is properly grounded and fully discharged to prevent residual charge in the device from affecting the test results.
Perform the test under suitable environmental conditions. It is recommended to have a relative humidity below 75%, no rain, and a temperature range of 20-30°C to avoid moisture or temperature fluctuations affecting the test results.
Perform the test under suitable environmental conditions. It is recommended to have a relative humidity below 75%, no rain, and a temperature range of 20-30°C to avoid moisture or temperature fluctuations affecting the test results.
Test Progress
Connect the Test Instrument:
Connect an insulation resistance tester to the high voltage terminal of the device under test and to ground.
Apply Test Voltage:
Select an appropriate test voltage based on the rated voltage of the equipment .
Connect an insulation resistance tester to the high voltage terminal of the device under test and to ground.
Apply Test Voltage:
Select an appropriate test voltage based on the rated voltage of the equipment .
Measure and Record
Start the test and record the following parameters:
Insulation resistance value (MΩ)
Applied voltage
Ambient temperature and humidity during testing
Insulation resistance value (MΩ)
Applied voltage
Ambient temperature and humidity during testing
Temperature Correction
The measured insulation resistance values are corrected to a reference temperature (usually 20°C) for accurate evaluation.
Repeat Testing (if necessary)
Measure different windings (high voltage, medium voltage, low voltage) or each bushing separately, and conduct comparative analysis to ensure the insulation status of all parts.
Evaluation Criteria (Reference)
nsulation resistance ≥ 1000 MΩ (excellent)
500 MΩ ≤ Insulation resistance < 1000 MΩ (good)
100 MΩ ≤ Insulation resistance < 500 MΩ
Insulation resistance < 100 MΩ
500 MΩ ≤ Insulation resistance < 1000 MΩ (good)
100 MΩ ≤ Insulation resistance < 500 MΩ
Insulation resistance < 100 MΩ
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
Widely deployed in commercial office buildings, shopping malls, hotels, high-rise residential towers, schools, and hospitals for safe indoor step-down from 22 kV medium-voltage to 400/230 V low-voltage distribution. Ideal for fire-sensitive, noise-restricted, or space-constrained locations where oil-filled transformers are prohibited by building codes, insurance requirements, or environmental regulations.
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
10.5KV Oil Immersed Substation Transformer
The 10.5kV Oil Immersed Substation Transformer is specifically designed for medium-voltage power substations requiring stable voltage conversion and reliable long-term operation. Utilizing a proven oil-immersed insulation system, the transformer provides excellent dielectric strength and efficient heat dissipation, ensuring dependable performance under continuous load conditions. High-quality winding materials and precise manufacturing processes enhance mechanical strength and short-circuit resistance. With low operating noise and strong thermal stability, the transformer is well-suited for modern substations serving industrial, commercial, and infrastructure power distribution systems.
65kV Three-Phase Oil-Immersed Power Transformer with No-Load Voltage Regulation
The 65kV Three-Phase Oil-Immersed Power Transformer with No-Load Voltage Regulation is engineered for medium-to-high voltage distribution systems requiring stable performance and precise voltage control. Equipped with a no-load tap changer, the transformer allows flexible adjustment of voltage ratios to meet varying grid demands. Its high-grade silicon steel core and oxygen-free copper windings ensure low losses, superior thermal efficiency, and long operational life. The oil-immersed cooling system provides enhanced heat dissipation, while the durable outdoor-rated tank structure enables reliable operation in harsh climatic environments. Designed in compliance with IEC, IEEE, and GB standards, this transformer is widely used in utility substations, industrial power networks, renewable energy stations, and large commercial distribution systems. It delivers consistent voltage regulation, strong overload capability, and dependable long-term grid support.
10kV Cast Resin Dry Type Transformer Copper Winding
The 10kV Cast Resin Dry Type Transformer Copper Winding, a high-reliability, oil-free power solution engineered for safe and efficient indoor medium-voltage distribution. This three-phase dry-type transformer features fully vacuum-cast epoxy resin encapsulation around high-purity copper windings, combined with premium low-loss grain-oriented silicon steel cores to deliver exceptional energy efficiency (typically 98%+), significantly reduced no-load and load losses, and outstanding partial discharge performance (<10pC). The cast resin design ensures superior moisture resistance, self-extinguishing fire safety (F1 class), robust short-circuit withstand, and maintenance-free operation. Natural air (AN) cooling with optional forced air (AF) upgrades supports high overload capacity while maintaining low acoustic emissions through advanced vibration isolation and optimized core/winding geometry. Compliant with IEC 60076-11 and equivalent standards, this transformer steps down 10kV primary (with ±2×2.5% or wider off-circuit taps) to 0.4kV secondary (Dyn11 vector group standard), making it the ideal choice for modern commercial, industrial, and utility indoor installations prioritizing safety, sustainability, and long-term performance.
45kVA Three Phase Pad Mounted Transformer
The 45 kVA pad-mounted transformer meets ANSI, CSA, NEMA, IEEE, and DOE standards. The compartmental dead-front enclosure features tamper-resistant doors, mineral oil or ester fluid insulation, and ONAN cooling for a 65°C temperature rise, enabling quiet, overload-capable operation in outdoor pad installations.
230kV 3-Phase Step-Down Power Transformer
The 230kV 3-Phase Step-Down Power Transformer is designed to reduce high transmission voltages to suitable distribution levels while maintaining excellent efficiency and operational stability. Engineered for utility substations and large-scale grid interfaces, this transformer ensures safe and controlled power delivery from high-voltage networks to regional or industrial distribution systems. Its oil-immersed insulation system provides strong dielectric protection and efficient thermal dissipation, enabling reliable continuous operation under varying load conditions. Precision core construction and optimized winding layout help minimize energy losses and voltage fluctuation. The transformer’s robust mechanical design enhances resistance to short-circuit forces and thermal stress, supporting long service life and low maintenance. This solution is ideal for modern power grids requiring dependable voltage transformation and efficient energy management.
750kVA Radial Feed Pad Mounted transformer To Honduras
The 750kVA Radial Feed Pad Mounted Transformer is a high-capacity, three-phase, oil-immersed distribution transformer specifically configured for radial feed (single-source primary supply) applications. It is ideal for utility substations, commercial complexes, industrial sites, and large residential developments requiring dependable step-down from medium-voltage primary lines to low-voltage secondary service. Fully compliant with ANSI C57.12.00, IEEE C57.12.90, IEEE C57.12.34 (for pad-mounted compartmental-type transformers), IEC 60076, and DOE 2016 efficiency standards (aligned with 2029 amendments for reduced losses), this 750 kVA unit provides excellent energy efficiency (>99.2% typical), low no-load/load losses, robust overload capability, and long-term reliability in outdoor environments. Typical specifications include mineral oil or FR3 natural ester fluid (ONAN cooling), aluminum or copper windings, primary voltage 13.8kV (13800V Delta or 12470GrdY/7200 common for Latin America/Honduras compatibility), secondary 480Y/277V (or 208Y/120V, custom options), BIL 95kV HV / 30kV LV, impedance 5.75–7.0% (±7.5%), ±2×2.5% taps, radial-feed dead-front design with three high-voltage bushings (H1, H2, H3), bayonet fuses + partial-range current-limiting fuses, load-break switch (optional), lightning arresters, pressure relief valve, oil level/temperature gauges, and ANSI 70 gray (or Munsell green) finish. Low sound level (<60 dB), strong short-circuit withstand, and radial-feed configuration suit single-source underground or overhead feeds.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