HENGFENGYOU TRANSFORMER|ANSI/IEEE STANDARD TRANSFORMER
HENGFENGYOU TRANSFORMER|ANSI/IEEE STANDARD TRANSFORMER
Hengfengyou 24.9kV US standard three-phase dry-type distribution transformer is a high-voltage safe, energy-saving, eco-friendly and maintenance-free power distribution equipment fully compliant with American power industry standards. It is widely used in North American high-voltage municipal power grids, large industrial parks, mining enterprises, commercial hubs, high-rise complexes, data centers and key high-standard indoor power supply projects.
With ultra-low power loss, low noise, excellent flame retardancy and zero environmental pollution, all performance parameters surpass ANSI and IEEE standard requirements. It adopts F1 class fire-resistant design, with high lightning impulse withstand voltage up to 95kV. Supported by forced air cooling system, it can operate stably under 120% rated load. Equipped with complete intelligent temperature monitoring and full-set protection system, the transformer owns outstanding operational stability and long service life.
Our 24.9kV US standard dry-type transformers have been exported to more than 50 countries and regions, mainly serving North America, Latin America and Oceania high-voltage power markets, and have gained high reputation and wide recognition in global American-standard high-voltage power distribution systems.
24.9kV high-voltage urban distribution network construction and renovation in North America
Indoor high-voltage power supply for large commercial buildings, hospitals, campuses and data centers
High-voltage power distribution for US-standard heavy industry, mining plants and municipal key infrastructure
Indoor high-voltage substations, underground power stations, large public facilities and fire-sensitive core areas
ANSI C57.12.01 / ANSI C57.12.22
IEEE C57.110 / IEEE C57.12.90
IEC 60076 series
GB 1094 series
Low loss & high energy efficiency: Adopts US high-voltage optimized electromagnetic design, greatly reduces no-load and load loss, achieves remarkable energy-saving effect, meets North American high-voltage power energy efficiency certification standards.
Low noise operation: Low-vibration core and integrated compact winding structure ensure stable low-noise running, conforming to American regional environmental noise control regulations.
Flame retardant & ultra-safe: F1 grade high-standard fireproof performance, self-extinguishing, halogen-free, smokeless and non-toxic, no fire leakage and explosion risks, fully compliant with US high-standard building fire safety codes.
Strong high-voltage impulse resistance: 24.9kV high voltage class lightning impulse withstand voltage reaches 95kV, excellent lightning protection and overvoltage surge resistance, adapts to complex high-voltage grid operation environment.
Powerful overload capacity: Realizes stable long-term operation at 120% rated load with forced air cooling mode, strong load impact resistance to meet peak power demand of heavy industry.
Intelligent temperature protection: Built-in high-precision temperature monitoring, automatic fan control and multi-stage overtemperature alarm & trip protection system.
Heavy-duty customizable enclosure: Optional aluminum alloy, cold-rolled steel and anti-rust stainless steel shell; protection class IP20 / IP23 available for different installation environments.
Zero daily maintenance: Integral high-strength cast resin insulation structure, outstanding moisture-proof, dust-proof and corrosion-resistant performance, suitable for various harsh high-voltage working scenes.
HV winding: High-spec copper strip continuous winding, high vacuum integral casting, customized patented high-voltage flame-retardant epoxy formula meeting US environmental standards
LV winding: High-precision copper foil winding, thermosetting epoxy full insulation, strong high-voltage short-circuit resistance
High overall structural rigidity, extremely low partial discharge value, superior mechanical stability for high voltage operation
High-grade imported oriented cold-rolled silicon steel sheet for high voltage use
Optimized ladder lap joint and multi-stage step-lap stacking structure
Special high-temperature resistant mineral oxide insulating coating, effectively reduce no-load loss and running noise
Natural air cooling (AN) / Forced air cooling (AF) dual cooling modes
Independent real-time temperature monitoring for three-phase high voltage windings
Automatic fan start-stop linkage, overtemperature early warning and emergency trip protection
Stable and reliable continuous operation for long-cycle high-load working conditions
Material: Aluminum alloy, cold-rolled steel, stainless steel optional
Protection Class: IP20 (indoor anti-touch), IP23 (semi-outdoor rainproof)
Scientific high-voltage ventilation structure, neat appearance, convenient installation, inspection and maintenance
Compact high-voltage optimized structure, small floor space, suitable for indoor high-voltage power rooms, basement closed power distribution spaces
All oil-free dry-type design without flammable oil medium, no extra high-standard fire protection facilities required
Low noise design can be installed close to high-voltage load center, effectively reduce high-voltage line loss
Unified American standard installation size, simple construction procedure and low overall project investment cost
Keep installation site dry, well ventilated, free of corrosive and harmful gas
Reserve sufficient high-voltage safety insulation distance and heat dissipation space in accordance with ANSI installation specifications
Ensure firm and horizontal foundation installation to avoid high-voltage equipment vibration and deformation
Adopt standard American high-voltage cable connection process, reliable grounding (grounding resistance ≤ 4Ω)
Complete set of high-voltage intelligent temperature monitoring and control system
Integrated overcurrent, overload, overtemperature multi-dimensional safety protection
Equipped with high-voltage surge arrester for overvoltage and lightning protection
Compatible with traditional and intelligent high-voltage power distribution systems in North America
Winding DC resistance accurate test
High voltage ratio, polarity and vector group verification
Insulation resistance and power frequency withstand voltage test
No-load loss, load loss and temperature rise test
Full function inspection of temperature control and high-voltage protection system
Full dry-type oil-free structure, realize true maintenance-free operation
Regular routine inspection: equipment appearance, operating temperature, fastening connectors and running sound
Regularly clean ventilation dust to ensure stable heat dissipation of high-voltage equipment
Support remote cloud monitoring, realize intelligent unified operation and maintenance management
Long design service life under standard rated working conditions
Strong environmental adaptability, excellent moisture-proof, dust-proof and salt fog corrosion resistance
Perfectly match high-rise buildings, closed indoor spaces and high fire-risk high-voltage power supply scenarios
| Item | Core Content | Recommended Scheme/Standard |
|---|---|---|
| Type | 24.9kV three-phase dry-type distribution transformer | Cast resin, full copper winding, US high voltage standard |
| Standards | American mainstream high-voltage power industry standards | ANSI C57.12 series, IEEE C57 series, compatible with IEC & GB |
| Performance | Low loss, low noise, high efficiency | Exceeds ANSI/IEEE high voltage standard technical indicators |
| Fire Class | F1 flame retardant, non-toxic, smokeless self-extinguishing | Preferred for indoor high-voltage engineering per US fire codes |
| Lightning Impulse | 24.9kV level: 95kV | Excellent high voltage lightning and surge resistance |
| Cooling Mode | AN / AF dual cooling mode | AF mode supports 120% rated load stable operation |
| Enclosure | Aluminum alloy / cold-rolled steel / stainless steel | IP20 / IP23 optional, customized as demand |
| Application | US standard 24.9kV high voltage grid, industrial & civil high-voltage power distribution | Fire-proof safe, maintenance-free high-reliability high-voltage power solution |
Hengfengyou 24.9kV US standard three-phase dry-type distribution transformer integrates high safety, high efficiency, low noise, environmental protection and maintenance-free core advantages. Relying on 30 years of professional high-voltage transformer manufacturing experience and abundant overseas American-standard high-voltage project experience, the product adopts advanced high-vacuum integral casting technology, high-quality low-loss iron core and intelligent full-range temperature protection system. All technical performances fully comply with ANSI and IEEE American high-voltage power standards, which can fully meet the high-voltage power distribution demands of modern North American urban high-voltage grids, heavy industry production and large-scale civil construction projects.
This series of products have been exported to more than 50 countries around the world, and are widely used and highly praised in North America, Latin America and other American-standard high-voltage power markets. We provide global customers with safe, stable, energy-saving and long-life professional high-voltage power distribution solutions for all kinds of indoor closed spaces and fire key prevention scenarios.
Q1: What is a 24.9kV US standard dry-type distribution transformer?
A: It is ANSI/IEEE certified cast resin oil-free flame-retardant high-voltage transformer, specially designed for 24.9kV American standard high-voltage power grid, widely used in indoor high-voltage stations, industrial heavy load power supply and fire key protection areas in North America.
Q2: What are the advantages of 24.9kV US standard dry-type transformer compared with oil immersed transformer?
A: It is flame retardant, non-toxic, oil-free without leakage and explosion hidden danger, low running noise and maintenance-free. It meets the strictest American high-voltage power and building safety regulations, and is the most ideal equipment for indoor high-voltage power distribution.
Q3: What fire resistance grade does it reach?
A: It reaches F1 high-level fire resistance grade, self-extinguishing, halogen-free, smokeless and non-toxic, fully in line with US NFPA high-standard fire protection specifications.
Q4: What is its lightning impulse withstand level?
A: The 24.9kV high voltage model owns 95kV lightning impulse withstand voltage, with strong high-voltage lightning protection and grid overvoltage suppression ability.
Q5: Can it run under overload state?
A: Yes. With forced air cooling system, it can operate stably for a long time under 120% rated load.
Q6: What protection grades can be chosen?
A: IP20 indoor anti-touch type and IP23 rainproof type are available, and the enclosure material can be customized according to project site environment.
Q7: Does it need complex daily maintenance?
A: Basically maintenance-free. Only simple regular appearance inspection, temperature observation and dust cleaning are required.
Q8: What main application scenarios does it apply to?
A: North American 24.9kV high-voltage distribution network, large commercial buildings, hospitals, data centers, high-rise building high-voltage power distribution and various US standard heavy industrial plants.
Q9: What international standards does it comply with?
A: It strictly implements core American standards such as ANSI C57.12.01, ANSI C57.12.22 and IEEE C57 series, and is compatible with IEC and GB standards, fully meeting overseas high-voltage market access and international project bidding standards.
