hybrid transformer
Hybrid Transformer
An all-in-one transformer that integrates power transformation and harmonic mitigation functions. Developed as an industry-first solution through joint R&D with KEPCO’s five power generation subsidiaries, it is certified under the New Excellent Technology (NET) and Green Technology.
Why Hybrid?
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01
Optimized for Harmonic-Intensive Environments
A solution designed for high-harmonic environments such as AI data centers, smart farms, and automated facilities.
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02
Higher Efficiency and Lower Operating Costs
By reducing harmonic-related losses and temperature rise, the Hybrid Transformer improves energy efficiency and lowers operating costs.
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03
Lower CAPEX and Smaller Installation Footprint
With no separate harmonic filter required, the Hybrid Transformer reduces initial investment costs and installation space.
Expected Benefits
Accredited performance tests have verified reductions in harmonics, power losses, and winding temperature rise.
- Conventional Transformer
- Hybrid Transformer
- Conventional Transformer
- Hybrid Transformer
- Conventional Transformer
- Hybrid Transformer
Source: Accredited test report | Test Institution: Korea Electrotechnology Research Institute (KERI) | Test Sample: Cast-resin transformer, 1,000 kVA
Annual CO₂ Emissions Reduction
CO₂ calculation based on the National Institute of Forest Science conversion factor:
1 kW of electricity = 0.5 kg CO2
Strong Economic Value
Compared with conventional transformer systems, the Hybrid Transformer reduces operating costs and lifecycle costs (LCC), while lowering equipment CAPEX by up to 40% compared to conventional transformer-plus-filter configurations.
Reduced CAPEX
No separate harmonic filter is required, reducing initial investment costs.
- Based on 1,500 kVA Mold Transformer
Reduced OPEX
Lower annual power consumption from harmonic mitigation reduces electricity charges and lifecycle cost.
KRW 127 million reduction in lifecycle cost.
- Equipment CAPEX : Based on the listed sales price of cast-resin transformers in Korea Price Information (March 2025)
- Operating Cost : Based on General Service (B) II tariff, with load distribution of 45% peak load, 35% mid-load, and 20% off-peak load, assuming THD of 25.5%
- Disposal Cost : Based on the average market price as of March 2025
- 20-Year Operating Cost : Annual operating cost × 20 years
- 20-Year Total LCC : Equipment CAPEX + 20-year operating cost + disposal cost
Certificates
Officially recognized for technical excellence through New Excellent Technology (NET), Green Technology, Excellent Government Supply Product, LH New Technology, and other major certifications.
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New Excellent Technology (NET) -
Green technology -
Korea Government Excellent Product -
LH New Technology(Product) Confirmation -
Excellent Performance Certification
Patents
Core technologies protected by patents in Korea, the United States, and China.
National Professional Engineer Examination
Featured multiple times in Korea’s national Professional Engineer examination, demonstrating the Hybrid Transformer’s technical credibility.
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4. Explain the concept and winding method of the Hybrid Transformer, increasingly applied to extra-high-voltage (22.9 kV/LV) transformers, and compare its characteristics with those of general transformers and low-noise high-efficiency transformers.103rd Examination (2014)
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11. Explain the Y-Zig Zag connection of transformers.106th Examination (2015)
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1. Explain the winding method of a Hybrid Transformer for 22.9 kV-LV distribution service with harmonic attenuation capability, and compare its characteristics with those of a K-factor transformer.116th Examination (2018)