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A Hybrid Transformer is an all-in-one distribution transformer for systems up to 22.9 kV that combines transformer and harmonic-filter functions.
By reducing harmonics generated by nonlinear loads, it lowers power loss and winding temperature, improves transformer efficiency, and helps reduce operating costs. It is especially suited to sites with high harmonic generation such as data centers, smart farms, and factory automation facilities.

No. Conventional transformers do not mitigate harmonics. Separate harmonic filters or high-performance rectifiers (12-pulse, 24-pulse) must be added when harmonic mitigation is required.

The initial installation cost of a Hybrid Transformer is slightly higher than that of a conventional transformer. However, lower operating cost and longer service life make it more economical over the long term.
Compared with a high-efficiency transformer, a Hybrid Transformer may have about 30% higher installation cost, but can reduce operating cost by up to 8.8% and save about KRW 130 million in 20-year lifecycle cost.
Compared with a “high-efficiency transformer + harmonic filter” configuration, a Hybrid Transformer can reduce installation cost by about 40%, operating cost by about 5%, and lifecycle cost by about KRW 230 million over 20 years.

No. Enertech developed the Hybrid Transformer first in the industry in collaboration with KEPCO’s five generation subsidiaries and obtained NET certification.
Patents are registered in Korea, the United States, and China, and Enertech is a global leader with the core source technology for Hybrid Transformers.

Yes. Since 2010, they have been supplied and operated across diverse sites including government institutions, airports, power plants, high-speed rail, POSCO, and Samsung, and their performance has also been verified in industrial facilities, buildings, plants, and apartment complexes.
Hybrid Transformers are also NET products designated for preferential public procurement and recognized as outstanding inventions.

Harmonics are frequency components that are integer multiples (2nd to 50th) of the fundamental frequency (60 Hz). When harmonics are present, voltage and current waveforms are distorted, causing poor power quality, higher losses, equipment heating, and malfunction.
Therefore, harmonic mitigation is critical for improving facility efficiency, reducing losses, preventing failures, ensuring reliability, and extending equipment life. KEPCO and international standards (IEC, IEEE) also limit harmonic voltage (VTHD) in distribution systems to 5% and current distortion (TDD) to 8–12%.

Harmonics are generated by nonlinear loads such as inverters, UPS systems, servers, EV chargers, and LED lighting. If not controlled, they can cause degraded power quality, equipment damage, shorter life, higher power losses, lower efficiency, malfunction of protective devices, and communication or metering errors. Harmonic mitigation is therefore a core element of power-quality management.

Enertech uses more than six high-performance advanced measurement instruments for harmonic analysis, along with a system capable of real-time multipoint measurement and long-term logging to secure precise and reproducible data. High-resolution equipment allows accurate analysis of the actual impact of harmonics.

Enertech follows a diagnostic process based on IEC and IEEE international standards. We quantitatively analyze key indicators such as THD, TDD, K-factor, and unbalance to deliver reliable, internationally accepted results.

Based on precise measurement data, the report identifies the causes of harmonics, evaluates the impact of damage, and recommends improvement measures in a comprehensive format that customers can act on.

The Korea Electrical Safety Corporation’s periodic inspection is a legally mandated safety check focused on basic safety compliance. Enertech’s harmonic diagnosis, by contrast, precisely analyzes power-quality factors such as harmonics, THD, unbalance, power factor, and voltage fluctuation, evaluating both equipment efficiency and system stability.

Enertech has more than six advanced measurement and analysis devices, and our diagnostics are performed directly by power-analysis specialists including Ph.D. and M.S. engineers, senior technical experts, and licensed electrical engineers.