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3 phase transformers

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 Enhancing Reliability & Efficiency with Advanced Thermal Management and Electrical Solutions

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Product Overview

High-power application and optimized heat dissipation design.

  • Three-phase power conversion: supports three-phase power input and output, suitable for industrial and high-power equipment.
  • High-power application: specially designed for high power demand to meet the operation requirements of heavy equipment.
  • Heat dissipation optimization design: efficient heat dissipation structure to ensure long-term working stability.

 

 

Key Advantages

  • Amorphous Core Option for Ultra-Low No-Load Losses
    Utilizing amorphous metal laminations cuts no-load losses by up to 70% versus standard CRGO steel, delivering unmatched energy savings in lightly loaded applications.

  • Optimized Short-Circuit Impedance Profiling
    Custom-engineered winding spacing and turns ratio produce precise %Z values, ensuring controlled fault currents for selective coordination without excessive voltage drop under full load.

  • Impulse Voltage Withstand Class III
    Class-III impulse insulation systems (up to 250 kV peak) protect downstream electronics from transient surges—critical in lightning-prone or utility-unstable grids.

  • Low-Audible-Signature Acoustic Design
    Acoustic dampening laminations and “split-winding” coil construction reduce magnetostriction noise to below 35 dB(A)—essential for installations in noise-sensitive environments.

  • Phase-Shift Vector Engineering
    Availability of uncommon vector groups (e.g., Y-Yn0, D-Yb1) enables substation designs that eliminate circulating currents in parallel transformer banks and optimize grounding schemes.

  • Thermal Hot-Spot Monitoring
    Embedded fiber-optic temperature sensors directly contact the hottest coil turn, giving real-time hotspot data far more accurate than standard external RTDs.

  • Bi-Directional Tap-Changer Automation
    Microprocessor-controlled on-load tap changers automatically adjust both raise and lower taps to maintain voltage within ±0.5% under dynamic load swings.

  • Nanocomposite Varnish Insulation
    Advanced nanocomposite resin coatings provide superior adhesion, dielectric strength, and moisture resistance—extending coil life in high-humidity or chemical-exposure zones.

  • Harmonic Mitigation Winding Algorithms
    Proprietary winding interleaving patterns attenuate 5th and 7th order harmonics, reducing harmonic heating and improving power quality for VFD-dominated loads.

  • Eco-Friendly Ester-Filled Designs
    Synthetic ester dielectric fluids offer a 50% higher flash point than mineral oil, biodegradable properties, and better dielectric recovery—ideal for environmentally sensitive sites.

Product Catagories

wdt_ID wdt_created_by wdt_created_at wdt_last_edited_by wdt_last_edited_at Model Capacity KVA bl max b2 max dl d2 hl MAX LI MAX nl n2
2 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-0.16 016 64 50 5x8 M4 140 122 49 90
3 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-0.25 025 67 48 6x12 M5 162 156 49 113
4 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-0.4 04 82 56 6x12 M5 162 156 64 113
5 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-0.63 063 76 51 7.4x13 M6 187 181 56 136
6 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-1 1 97 61 7.4x13 M6 187 181 76 136
7 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-1.6 16 115 98 7.4x13 M6 214 229 94 170
8 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-2.5 25 133 102 10x18 M8 241 264 101 200
9 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-4 4 148 104 10x18 M8 250 270 118 224
10 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-6.3 63 155 129 10x18 M8 320 360 127 264
11 Kiva 09/07/2025 07:45 AM Kiva 09/07/2025 07:45 AM JSG-8 8 170 134 12x20 M10 380 420 140 315
Model Capacity KVA bl max b2 max dl d2 hl MAX LI MAX nl n2

SG electric transformer

wdt_ID wdt_created_by wdt_created_at wdt_last_edited_by wdt_last_edited_at odel Capacity KVA L B H
1 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-2.5 25 300 240 280
2 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-3 3 300 240 280
3 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-4 4 390 280 320
4 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-5 5 390 280 320
5 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-6 6 390 280 320
6 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-8 8 500 350 450
7 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-10 10 500 350 450
8 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-12 12 500 350 450
9 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-15 15 500 350 450
10 Kiva 09/07/2025 08:03 AM Kiva 09/07/2025 08:03 AM SG-20 20 600 420 520
odel Capacity KVA L B H

Applications

  • Industrial Power Distribution – Step down medium-voltage utility power to low-voltage levels for plant-wide equipment operation.

  • Manufacturing Machinery Supply – Provide stable 3-phase voltage to CNC machines, conveyor systems, and production lines.

  • Data Centers – Feed critical IT loads with balanced, clean power to support uninterrupted server operations.

  • Renewable Energy Integration – Convert generator output from wind or solar farms to grid-compatible voltage.

  • Mining and Heavy Industry – Power large motors, crushers, and drilling rigs in remote or rugged environments.

  • HVAC and Chiller Systems – Supply high starting-current motors for large commercial air conditioning and refrigeration units.

  • Marine and Offshore Platforms – Deliver reliable 3-phase power to ship propulsion, pumps, and navigation systems.

  • Hospitals and Critical Facilities – Maintain regulated voltage for sensitive medical equipment and emergency systems.

  • Transportation Infrastructure – Power railway traction systems, maintenance depots, and signaling equipment.

  • UPS and Backup Power Systems – Interface between generators and UPS units for stable emergency power.

Basic Knowledge

1. Core Materials & Lamination Quality

  • Grain-oriented silicon steel: Premium laminations reduce hysteresis losses by up to 50% compared to generic CRGO steel. Insist on ≤0.23 mm lamination thickness for continuous-duty applications.

  • Inter-laminar insulation: Many budget units skimp here—voids or resin-poor layers lead to eddy-current hotspots and accelerated insulation aging.

2. Cooling & Thermal Management

  • Directed airflow ducts: High-power transformers should include built-in air channels that direct cool air over the hottest core tones, not just free-convection fins.

  • Oil-free vs. oil-filled: Dry-type designs avoid fire risk and leak concerns, but require precise ambient temperature control. Oil-filled units can tolerate higher loads if you monitor oil temperature with RTD probes.

3. Vector Group & Phasing Impacts

  • Phasor alignment: Incorrect vector group (e.g., Δ–Y vs. Y–Y) can introduce phase shifts that conflict with upstream protection relays, causing nuisance trips. Always match the upstream feeder’s vector designation.

  • Zero-sequence paths: In Y–Δ transformers, the Δ winding handles unbalanced load currents; omitting it causes neutral overvoltages under single-phase loads.

4. Harmonics & Nonlinear Load Handling

  • K-factor ratings: When feeding VFDs or UPS systems, specify a transformer with K-factor ≥ 13 to withstand harmonic heating. Standard units overheat prematurely under diode-rectifier loads.

  • Shielded windings: Electrostatic shields between primary and secondary reduce the transfer of high-frequency noise into sensitive downstream equipment.

5. Installation & Vibration Control

  • Anti-vibration mounts: In factories with heavy machinery, spring or rubber-isolated feet prevent core-coil loosening. Rigid mounting can lead to clacking noises and winding fatigue under resonant frequencies.

  • Orientation matters: Position the transformer so its breather and any pressure-relief valves are accessible—burying them makes routine oil maintenance and safety checks hazardous.

6. Environmental Protection & Site Preparation

  • NEMA/IEC enclosures: For outdoor or wash-down areas, choose NEMA 3R or IP 23 enclosures. Internal drip shields and raised cable entry glands keep moisture off windings.

  • Corrosive atmospheres: In chemical plants, PTFE-coated tank interiors and stainless-steel fasteners prevent acid-induced metal corrosion that can disable grounding lugs.

7. Condition Monitoring & Predictive Maintenance

  • Partial discharge testing: Annual PD scans catch insulation voids before they evolve into catastrophic failures—most facilities skip this until it’s too late.

  • Infrared thermography: Spot-check winding end-terminals and bushing connections under full load. A 5 °C hotspot can halve coil lifetime if left unchecked.

8. Lifecycle & Upgrade Strategies

  • Plug-in tap changers: On-load tap changers allow voltage regulation without shutdowns—ideal for critical processes. Budget units often omit this feature, forcing downtime for manual adjustments.

  • Transformer retrofits: Replacing core laminations and rewinding coils with halogen-free, high-temperature Class H insulation can extend life by 10–15 years rather than full replacement.

Why Choose Leipole?

As a professional buyer, do you face these challenges?

❌ Delivery delays – affecting project progress and production line stability

❌ Poor technical adaptability – standard products cannot meet complex working conditions

❌ High hidden costs – frequent maintenance, excessive energy consumption, slow after-sales response

❌ Compliance risks – lack of international certification leads to customs clearance and warranty disputes

Leipole is proud to offer one-stop solution:

💎 Global layout, zero delivery delays

  • R&D and sales headquarter led by the team in Singapore – cutting-edge cooling technology iteration to ensure product leadership
  • Manufacturing base in Shanghai, China – ISO 9001 & ISO14001 certified, cost optimization + high quality control standards
  • Localized warehousing in 24 countries – spot shipments from the EU, America, and Southeast Asia, urgent orders arrive within 3 days

🔧 Deep customization capabilities to solve complex needs

  • OEM/ODM full-case support – from cooling structure design to branding customization, 100+ successful cases (Industrial Automation/ New Energy Industry/Data Centers)
  • Working condition simulation test – Free simulation of air volume, high temperature, high humidity and vibration environment to ensure 100% adaptability of the solution

🌍 Worry-free compliance, global access

  • Authoritative certification – CE, UL, RoHS, REACH full coverage, hassel-free customs clearance in Europe, America and Southeast Asia

🚀 Cost optimization throughout the entire life cycle

  • Energy consumption reduced by 30% – patented airflow design, saving 30% in electricity bills per year compared to peer product
  • 1-year warranty – redundant design of key components, failure rate <0.2%
  • 7×24 localized service – 50+ national technical teams, 4-hour response, direct supply of spare parts.

Customization Process

Accurate Demand Analysis

Professional engineers deeply understand your equipment parameters, application environment, and special requirements.

Customized Technical Solutions

R&D teams develop optimal heat dissipation solutions based on your needs, including airflow calculations and installation planning.

 Sample Testing and Validation

Provide samples for real-environment testing, collect data feedback, and ensure solution effectiveness.

Mass Production

After confirming the solution, production follows strict ISO9001 quality management systems to ensure batch stability.

FAQ

🔹When should you specify a 3-phase dry-type transformer with K-factor rating?

💡For environments powering variable-frequency drives, choose a 3-phase dry-type transformer K-factor rated (e.g., K-13 or higher). It handles harmonic currents without overheating and doesn’t require oil containment.

🔹How do you select a 3-phase pad-mounted transformer for outdoor use?

💡Pick a 3-phase pad-mounted transformer outdoor rated enclosure (NEMA 3R/IP23) with anti-condensation breathers. Ensure corrosion-resistant finish and fuse compartments for safe urban or rural installations.

🔹What are the benefits of an on-load tap-changer 3-phase transformer?

💡An on-load tap-changer 3-phase transformer lets you adjust secondary voltage under load to maintain stable output during supply fluctuations—critical for data centers and continuous-process plants.

🔹Why choose a 3-phase oil-filled transformer for high-capacity power distribution?

💡A 3-phase oil-filled transformer high-capacity uses mineral or ester oil to cool and insulate, supporting higher kVA ratings in a compact footprint while offering longer thermal life than dry types.

🔹How do you size a 3-phase transformer for UPS and generator paralleling?

💡For UPS-generator systems, use a 3-phase transformer for UPS paralleling sized at 125% of continuous load, with delta–wye vector matching the upstream sources to prevent circulating currents and ensure proper syncing.

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