Transformers Solution For Data Center
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Professional transformers solution for data center, High-density AI & mining hubs with FR3 fluid, K-Factor, and 20% overload capacity.
Kerun Data Center Power Equipment Portfolio & Standards Compliance
After years of focused research and project experience in data center power systems, Kerun groups the required equipment into the categories shown below for easier selection and integration. Our solutions are designed for reliability, efficiency, and safety, and comply with key international standards such as UL (for applicable products), IEC 60076, IEC 61439, and IEC 62271, supported by ISO 9001/14001/45001 management systems.
Powering High-Density Computing
Non-linear loads stress traditional electrical systems
Efficiency and Sustainability
High-efficiency cores exceed DOE 2016 standards
Kerun Transformer Project Targets Blockchain and Data Centers
Over the past five years, Kerun Transformer has successfully completed numerous data center and blockchain projects in North and South America. Below are some project examples from Kerun Transformer.
Case 1 : A Tier III scale green computing center in North America
Project Background: This client, located on the East Coast of the United States, is building a high-density data center to serve large-scale AI models. The client has extremely high requirements for PUE (Power Usage Effectiveness) and mandates that the equipment must meet stringent fire safety and environmental standards to achieve LEED green building certification.
Pain Points and Design Philosophy :
Modern AI data centers face high-density nonlinear loads, and the harmonics generated by servers can cause ordinary transformers to overheat. Tier III data centers require N+1 fire ratings and extremely high fire protection standards.
Kerun’s Solution :
We specifically designed K-Factor anti-harmonic cables and used FR3 vegetable oil instead of mineral oil. This not only upgrades the fire rating to K-level (ignition point > 360°C), but also utilizes the excellent heat capacity properties of vegetable oil to increase the transformer’s overload capacity by 20%, perfectly mitigating sudden spikes in AI computing power .
Technical Highlights :
Technical Highlights (for the two images – Pad-Mounted Transformer Interior & Exterior)
- Pad-mounted, compartmentalized design: Separate HV and LV compartments with clear terminal identification (H1/H2 and X1/X2/X3) to improve operational safety and simplify maintenance.
- Robust oil-immersed construction: Oil-filled active part for high thermal stability and reliable long-term operation under continuous loading.
- Integrated instrumentation & monitoring: Built-in gauges/indicators (e.g., oil pressure/temperature) support quick on-site condition checks and preventive maintenance.
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- High-efficiency cooling performance: External radiator fins and optimized oil circulation enhance heat dissipation, enabling stable performance in high ambient temperatures.
- Heavy-duty enclosure for outdoor service: Corrosion-resistant steel tank and weatherproof cabinet structure suitable for harsh environments and frequent utility operations.
- Service-friendly access: Wide-opening doors and organized internal layout improve inspection, cable termination, and component replacement efficiency.
- Secure grounding and bonding: Dedicated grounding points and bonding provisions to ensure safe operation and compliance with typical utility practices.
Technical Specification Details
| Parameter Item | Technical Specifications (Specifications) | Notes (Notes) |
|---|---|---|
| Rated capacity (rated power) | 3000 kVA (ONAN) / 3750 kVA (ONAF) | Air-cooled start-up capacity increases by 25%. |
| High voltage (HVVoltage) | 34.5 kV (delta connection) | Proposed North American mainstream medium-voltage power grid |
| Low voltage (LVVoltage) | 480Y/277V | Standard data center server voltage |
| Insulating liquid (insulating fluid) | FR3® Natural Ester Oil (Vegetable Oil) | Ignition point >360° C, K-class fire resistance standard |
| Frequency | 60 Hz | North American Standard |
| Cooling method | Knuth/Knuth | Natural cooling / Forced air cooling |
| Temp. Rise Factory | 65° C / 55° C | Initial 10° C overload margin |
| High-voltage tap range | ±2 × 2.5% (5 locations) | Five voltage levels to handle voltage fluctuations |
| Impedance voltage | 5.75% ~ 6.00% | Compliant with IEEE C57.12.34 standard |
| Energy efficiency standards (efficiency) | Meets the 2016 standards of the U.S. Department of Energy | Compliant with U.S. Department of Energy energy efficiency regulations |
| Noise Level | < 58 decibels | Silent design, suitable for use around data centers |
| Protection rating (enclosure) | NEMA 3R / IP54 | Rainproof |
Engineering and delivery details
- To ensure “zero downtime due to missing parts” on-site, we provide complete handover components:
- Protective devices:Standard configuration includes a Bay-O-Net plug-in fuse and a backup current-limiting fuse, providing dual overcurrent protection.
- Intelligent monitoring : Multi-functional oil level/oil temperature/pressure integrated instrument with communication interface, directly connected to the data center environmental monitoring system.
- Connections: The high-voltage side provides a 200A load switch and bearing well, while the low-voltage side provides a NEMA standard 12 -hole copper busbar plate.
- In accordance with the data center’s highest stability requirements, each device undergoes testing compliant with the IEEE C57.12.90 standard before leaving the factory.
- Noise test: The measured noise level was controlled below 56dB (4dB lower than the NEMA standard) to ensure that it would not interfere with the data center maintenance personnel.
- Partial discharge test : Partial discharge level < 50pC , verifying the perfection and flawlessness of the insulation system.
- Zero leakage verification: A 24-hour positive pressure sealing test is performed to ensure that there is no risk of leakage from FR3 vegetable oil.
- Logistics and Packaging
- an impact recorder during sea transport , allowing customers to read downtime data during transit upon receipt of the goods, ensuring that the equipment has not suffered internal damage.
- All outer packaging has a QR code ; scanning it will provide an electronic test report and installation manual.
Case Study 2:
Texas Blockchain and Cryptocurrency Mining Farm Expansion Project
During the Phase II expansion of an overseas data center campus, the owner required a power solution that could be deployed quickly while meeting strict reliability and compliance expectations. The electrical concept was medium-voltage utility service feeding multiple pad-mounted transformers, stepping down locally to 480Y/277V for low-voltage distribution, UPS input, and critical loads—minimizing feeder lengths, reducing losses, and improving maintainability.
Kerun’s engineering team worked closely with the EPC contractor and the data center O&M group to confirm system voltage class, fault-duty and impedance targets, efficiency requirements, sound limits, and dead-front elbow interfaces to match the site’s cable system. Kerun then delivered data-center-grade pad-mounted distribution transformers, supported by a complete documentation package (drawings, FAT reports, manuals, and spare parts). With consistent manufacturing control and a stable lead time, the site achieved on-schedule energization and transitioned smoothly into long-term operation.
Kerun Solutions :
Technical Highlights — Kerun Pad-Mounted Transformer (Data Center Grade)
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Dead-front, touch-safe MV interface: Elbow-type separable connectors (200A/600A class) reduce exposure risk and support fast, standardized field terminations.
- Compartmentalized HV/LV design: Separate MV and LV access improves operational safety, simplifies maintenance, and supports quick replacement in data center yards.
- High-reliability oil-immersed core & windings: Stable insulation and thermal performance for continuous 24/7 loading, optimized for critical power environments.
- High-efficiency, low-loss design: Premium core material and optimized winding design help reduce energy losses and operating cost (DOE-efficiency compliant design available).
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Strong thermal management: External radiator and optimized oil circulation enhance heat dissipation and improve overload tolerance in high ambient temperatures.
- Enhanced monitoring & serviceability: Built-in gauges/indicators (oil temperature/pressure/level options) and clear terminal labeling enable rapid inspection and preventive maintenance.
- Utility-grade protection options: Bay-o-net/current-limiting fuses, loadbreak switching options, and coordinated protection for MV feeder fault-duty (configurable).
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Rugged outdoor enclosure: Corrosion-resistant steel cabinet, weatherproof construction, and tamper-resistant hardware for long-term outdoor operation.
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Flexible configuration for data centers: Multiple voltage classes (12.47/13.2/13.8/15kV), 480Y/277V output, selectable impedance, and DETC tap range to match short-circuit studies.
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Standards-ready design: Built to align with IEEE/ANSI C57 (incl. C57.12.34) and NEMA, with UL (applicable configurations) support for project compliance.
- Product positioning : durable, good air intake, economical, and high temperature resistant .
Benchmarking logic : Although it is a mining area, in the high temperature of Texas, we need to emphasize the environmental temperature of the clothing and the special air intake design.
Technical Specification Details
| Parameter Item | Specifications | Remarks |
|---|---|---|
| Equipment Type | Oil-Immersed Pad-Mounted Distribution Transformer | Compartmentalized design (HV/LV separation) |
| Typical Application | Data Center Utility/MV to LV Step-down | Supports campus modular expansion |
| Manufacturer | Kerun Intelligent Control Co., Ltd. | OEM/ODM available |
| Rated Power | 2500 kVA | Typical data center block (customizable) |
| Phases | 3-Phase | Pad-mounted type |
| Frequency | 60 Hz | Common for North America |
| Cooling Method | ONAN | Oil Natural / Air Natural |
| Primary Voltage (HV) | 13.2 kV, Delta | Options: 12.47 / 13.2 / 13.8 / 15 kV class |
| Secondary Voltage (LV) | 480Y/277 V, Wye with Neutral | Neutral (X0) brought out |
| Vector / Connection | HV: Delta / LV: Wye-N (D–Yg) | Suitable for mixed 480V & 277V loads |
| Tap Type | DETC (De-energized Tap Changer) | Off-circuit taps |
| Tap Range | ±2 × 2.5% (5 positions) | +5%, +2.5%, 0, −2.5%, −5% |
| HV Rated Current | 109.3 A | Calculated @ 2500 kVA, 13.2 kV |
| LV Rated Current | 3007 A | Calculated @ 2500 kVA, 480 V |
| Percent Impedance | 5.75% | Selectable 5.0–7.5% per short-circuit study |
| Short-Circuit Withstand | Compliant with applicable IEEE/ANSI requirements | Designed for data center fault duty |
| HV Voltage Class | 15 kV Class | Per ANSI/IEEE practice |
| HV BIL | 95 kV | Typical for 15 kV class (project-defined) |
| LV BIL | 30 kV | Typical for 480Y/277V systems |
| Temperature Rise | 65°C Rise | 55°C optional for additional margin |
| Ambient Basis | 40°C Max / 30°C Avg | Typical rating basis |
| Sound Level | Meets NEMA TR-1 limits | Low-noise option available |
| Efficiency Target | Meets DOE efficiency requirements (as applicable) | High-efficiency design for data center OPEX |
| No-Load Loss (Po) | Optimized per DOE level (project-specific) | Final values per design & FAT report |
| Load Loss (Pk @ 75°C) | Optimized per DOE level (project-specific) | Final values per design & FAT report |
| HV Interface | Dead-front, elbow type (200A/600A class) | Matches utility cable system |
| LV Interface | Spade terminals / NEMA pads / bus provisions | Customizable to LV switchboard/UPS |
| Neutral (X0) | Provided in LV compartment | For grounding and 277V loads |
| Insulating Fluid | Mineral Oil (standard) / FR3 (optional) | FR3 supports ESG & fire-safety preferences |
| Winding Material | Copper (standard) / Aluminum (optional) | Copper recommended for higher efficiency |
| Core Material | High-grade CRGO Silicon Steel | Low-loss core design |
| Enclosure Construction | Steel pad-mounted cabinet, HV/LV compartmentalized | Outdoor, tamper-resistant design |
| Coating System | Outdoor corrosion-resistant coating | Coastal/heavy-duty paint optional |
| Standard Accessories | Pressure relief device, liquid level indicator, thermometer (typ.), grounding pads | Accessory set per O&M preference |
| Optional Monitoring | RTD, oil temperature sensor, online monitoring interface | Supports predictive maintenance |
| Factory Tests | Routine tests per IEEE/ANSI; FAT report provided | Ratio, polarity, losses, impedance, insulation tests |
| Documentation Package | Drawings, nameplate, manuals, test reports, packing list | Complete data center delivery set |
| Applicable Standards | IEEE/ANSI C57 Series (incl. C57.12.34), NEMA, DOE | Final list per project jurisdiction |
| UL | UL Listed / UL compliant design (as applicable) | Scope depends on selected components & market |
Kerun Service & Support for Pad-Mounted Transformers
At Kerun, we do more than supply equipment—we support your project from concept to commissioning. Our team helps customers select the right pad-mounted transformer configuration based on load profile, short-circuit study, voltage class, efficiency targets, and site conditions, ensuring the design fits both utility requirements and data-center operating practices.
We provide a complete delivery package including technical drawings, nameplates, factory test reports (FAT), manuals, and spare parts recommendations, and we can align interfaces such as dead-front elbow terminations, LV connection pads, protection schemes, and monitoring options to match your site standards. With standardized manufacturing control and strict quality management, Kerun delivers consistent performance, reliable lead times, and responsive after-sales support—helping you reduce installation risk and maintain long-term operational stability.
