Are you seeking a robust, efficient, and cost-effective power distribution solution for outdoor or industrial applications? Welcome to Jinhand Electric Co., Ltd., a premier China manufacturer, supplier, and factory with over a decade of expertise in designing and manufacturing high-performance Oil Immersed Transformers. Our comprehensive S13/S22-M series represents the pinnacle of oil-immersed technology, engineered to deliver reliable, maintenance-reduced operation for petroleum, metallurgy, chemical, textile industries, and all demanding outdoor environments worldwide. As a leading China manufacturer, we combine advanced electromagnetic design, rigorous quality control, and competitive pricing to provide customized Oil Immersed Transformer solutions that meet international standards and exceed customer expectations.
An Oil Immersed Transformer uses specialized insulating oil (mineral or ester-based) for both electrical insulation and heat dissipation. The core and windings are submerged in oil, which efficiently transfers heat to the tank surface or radiators, enabling high power density and reliable operation under continuous full load . Unlike dry-type alternatives, oil-immersed designs excel in outdoor, high-capacity, and harsh environment applications.
Jinhand stands out as your ideal partner because we are not just a supplier; we are a vertically integrated manufacturer and factory with advanced production facilities and rigorous quality control systems. Our expertise lies in producing fully sealed Oil Immersed Transformers that feature:
Hermetically sealed tank prevents oil oxidation and moisture ingress, eliminating the need for regular oil changes and extending service life.
Utilizing high-grade cold-rolled oriented silicon steel and optimized electromagnetic configuration, our transformers achieve no-load losses up to 30% below national standards.
IP54 protection rating with double-layer anti-corrosion coating ensures stable operation in high-dust (≥80 mg/m³) and high-humidity (RH ≥95%) environments, and corrosive environments.
All units undergo comprehensive factory testing, including no-load loss measurement, load loss verification, and partial discharge testing, ensuring 100% qualification before shipment.
Jinhand's Oil Immersed Transformer portfolio is designed to cater to diverse capacity and application requirements. Our primary series are:
The S13-M series represents our proven, reliable range of fully sealed distribution transformers. Designed to meet national energy efficiency standards with significantly reduced losses compared to conventional models.
Rated Capacity: Available from 30kVA to 2500kVA, covering most industrial and commercial distribution needs.
Voltage Compatibility: Supports 6kV, 6.3kV, 6.6kV, 10kV, 10.5kV, and 11kV high-voltage inputs with ±5% or ±2×2.5% tap adjustment, and fixed 0.4kV low-voltage output .
Connection Groups: Compatible with Yyn0 and Dyn11 configurations for flexible system integration.
Loss Performance: Features low-loss design with no-load losses typically 25% lower than S11 series .
General industrial facilities, commercial complexes, rural electrification, and applications requiring reliable, cost-effective power distribution.
The S22-M series represents the pinnacle of energy efficiency in Jinhand's Oil Immersed Transformer lineup. Meeting the stringent national Energy Efficiency Class 1 standards (GB 20052-2020), these transformers incorporate advanced amorphous alloy core technology or premium Hi-B silicon steel with optimized joint structures .
Ultra-Low Losses: Features dramatically reduced no-load loss (e.g., 1,280W for 2500kVA model), achieving 30-60% lower losses than conventional transformers .
Low Noise Operation: Step-lap core joints and vacuum annealing reduce magnetostriction, achieving noise levels ≤55 dB at 1 m distance .
Reduced Carbon Footprint: Higher efficiency directly translates to lower CO2 emissions, supporting green manufacturing and sustainability goals.
Projects with strict energy-saving mandates, industrial parks seeking operational cost reduction, and applications eligible for energy efficiency subsidies.
For large-scale industrial applications requiring substantial power capacity, Jinhand offers customized high-capacity Oil Immersed Transformers.
High Capacity: Available in ratings up to 2500kVA to handle heavy industrial loads.
Enhanced Cooling: Optimized tank design with corrugated fins for efficient natural cooling.
Robust Construction: Heavy-duty tank with reinforced lifting lugs and seismic-resistant design (withstands 8-degree seismic intensity).
Large manufacturing facilities, mining operations, petrochemical plants, and major industrial parks.
Specially designed for outdoor installation in harsh environments, these compact transformers combine rugged construction with reliable performance.
Weather-Resistant Enclosure: IP54 protection with anti-corrosion coating suitable for coastal and high-pollution areas.
Compact Design: Optimized dimensions for pole-mount or pad-mount installation.
Maintenance-Free Operation: Fully sealed construction eliminates regular maintenance needs.
Remote rural electrification, construction sites, outdoor substations, and temporary power applications.
Real-world feedback confirms the reliability and performance of our products.
"We installed six Jinhand S13-M-1600kVA oil-immersed transformers in our chemical processing plant three years ago. Operating in a highly corrosive, high-dust environment, they have performed flawlessly. The double-layer anti-corrosion coating shows no signs of degradation, and annual oil sampling confirms excellent insulation quality. The fully sealed design has eliminated our previous maintenance headaches with oil oxidation."
"After replacing aging transformers in our textile manufacturing facility with Jinhand S22-M series units, we've measured a 28% reduction in no-load losses. The ultra-low 0.5% no-load current has improved our facility's power factor significantly. The transformers run cool and quiet even during 24/7 continuous operation. Jinhand's technical support during commissioning was exceptional."
"For our new industrial park development, we needed twenty 2500 kVA oil-immersed transformers with special voltage tap configurations. Jinhand's engineering team worked closely with us to customize the designs, delivered all units within 45 days, and provided on-site installation guidance. The transformers have been operating flawlessly for two years now, powering our entire manufacturing zone."
Choosing Jinhand means gaining a partner committed to your project's success. We offer:
Our engineers analyze your load profile, site conditions, and grid parameters to recommend the optimal transformer model and configuration.
We can adjust voltage taps, protection class, connection group, and even integrate smart monitoring interfaces (temperature sensors, oil level gauges, pressure relief devices) to meet your specific needs .
Witness comprehensive testing (no-load, load, temperature rise, partial discharge, insulation resistance) at our China factory before shipment. We provide detailed test reports.
We supply full technical datasheets, dimensional drawings, wiring diagrams, instruction manuals, and quality certificates.
Our experienced engineers can provide on-site supervision for installation and commissioning, ensuring correct setup and optimal performance.
We offer training programs for your technical staff covering oil sampling procedures, routine inspection, and basic troubleshooting.
We manage professional export packaging (fumigation-free wooden cases meeting IPPC standards), documentation, and coordinate shipping (FOB, CIF, EXW) to ensure safe and timely delivery worldwide, with a 98% on-time delivery rate.
Our Oil Immersed Transformers are built to last decades in demanding environments:
The core is made of top-class Hi-B oriented silicon steel plate with improved exciting characteristics such as core loss, exciting current, and magnetostriction. The core is tightened uniformly with tempered plastic bands, and core election equipment is employed, making it compact and lightweight with a low noise level.
Depending on application requirements, we employ various winding configurations—cylindrical layer windings for low voltage/large current applications, high series capacitance disc windings for enhanced surge protection, and multi-parallel cylindrical tap windings for wide-range tap applications .
All insulation materials comply with EU RoHS directives, free of heavy metals. Extra high-voltage units undergo partial discharge testing to verify insulation reliability before leaving the plant .
The optimum cooling system is selected based on transformer capacity and installation circumstances. In larger cores, cooling oil ducts are provided at right angles to the steel plate stacking direction to maintain internal temperature rise within limits .
For larger capacities, we employ transposed conductors that reduce stray load loss, prevent local overheating, improve characteristics, and accomplish lightweight, compact designs .
Our vertically integrated factory ensures quality at every step:
Steel tanks adopt industrial robotic automatic welding with full weld seam coverage and welding precision ≤0.1mm, achieving 0 oil leakage rate and ensuring the airtightness of the fully sealed structure.
CNC precision silicon steel core cutting equipment with cutting error ≤0.05mm, and automatic stacking technology ensure uniform core lamination density, reducing core loss and magnetic vibration noise .
Full vacuum oil filling and dehydration process (vacuum degree ≤50Pa) removes air and moisture from transformer oil and internal insulation, improving insulation performance and thermal conductivity .
ISO 9001-compliant system with up to 20 quality inspection links, from incoming raw material verification to 100% routine testing of every finished unit .
Our R&D team continuously optimizes core and coil designs using finite element simulation analysis, reducing losses, lowering noise, and improving overall efficiency .
Choosing a Jinhand Oil Immersed Transformer directly impacts your bottom line:
The ultra-low no-load and load losses of our S22-M series translate to significant annual electricity savings. For a 1000 kVA model, annual energy savings are about 8,000 kWh under 80% load rate, translating to annual electricity cost savings of 1,200.
The fully sealed structure isolates insulating oil from air, avoiding oxidation and emulsification. Oil sample testing is only required every 5-8 years, saving the cost of oil replacement and manual operation.
With a design life exceeding 30 years, our transformers avoid the significant capital expenditure required for replacing inferior units every 15-20 years, drastically reducing total cost of ownership .
For outdoor installation, no additional fire suppression systems are typically required, saving upfront construction costs .
Jinhand is committed to sustainable manufacturing:
S13 and S22-M series meet the latest GB 20052-2020 and IEC 60076 efficiency standards, contributing to national and global energy conservation goals .
All insulating materials comply with EU RoHS directive, free of lead, mercury, cadmium, and other heavy metals, non-toxic and harmless during production, use, and disposal .
For environmentally sensitive areas, we offer transformers filled with natural ester oils (vegetable oils) that are 98% renewable, achieve >98% biodegradation in 21 days, and feature high fire points (360°C) for enhanced safety .
Ultra-low loss design helps industrial customers reduce carbon emissions by approximately 10 tons per year for 1000 kVA models, contributing to carbon neutrality goals .
Core materials like copper and steel are highly recyclable; transformer oil can be reprocessed or safely disposed of.
A: No, under normal operating conditions, oil changes are not required. The fully sealed design effectively prevents oil oxidation and moisture ingress. However, we recommend oil sample testing every 5-8 years to monitor insulation condition .
A: The primary difference is energy efficiency level. S13-M meets national Energy Efficiency Class 2 standards. S22-M meets the higher Class 1 standards, featuring significantly lower no-load losses (e.g., 460W vs 570W for the 630kVA model) and offering greater long-term energy savings .
A: Yes, it is suitable for outdoor installation with an IP54 protection rating and double-layer anti-corrosion coating. To further extend service life, we recommend adding a sun and rain shield, especially in extreme weather conditions .
Choosing Jinhand means investing in durability, efficiency, and long-term value. Our Oil Immersed Transformers are engineered to provide decades of reliable, maintenance-reduced service for the most demanding industrial and outdoor applications worldwide.
Contact Jinhand Electric Co., Ltd. Today for a Technical Consultation or Quotation!
