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A passive energy-saving system built around the PECO Harmonic Energy Recycling Transformer. The complete system combines the transformer with Saving and By-pass power paths and integrated protection devices.

A three-phase zig-zag autotransformer designed and manufactured in-house. A conventional passive autotransformer winds 96 turns and adds four to reach 100. PECO winds a full 100 and then adds four more, wound in reverse as a separate winding and tied to the main winding at both ends. The architecture is protected by Korean Patent No. 10-2546570.

No. PECO does not generate energy, and it is not a harmonic filter. The winding architecture was designed to place a series element in the distribution system without the resistive loss and heat that a series element normally brings. The name describes the design intent of the winding; it is not a claim that energy is created.

PECO belongs to that general product category. It differs in design objective: minimising the loss and heat the device itself adds, rather than voltage step-down alone.

The conventional arrangement is one continuous winding — 96 turns plus four — with the step-down taken from a tap. PECO uses 100 turns plus four wound in reverse as a separate winding, tied at both ends. The step-down is the same 4 %, but more conductor is used and current density is lower. PECO also has nine zig-zag transition points where a conventional arrangement has six, and ships as a complete assembly with integrated protection and By-pass.

Reduction of fifth- and seventh-order harmonic current is characteristic of zig-zag energy-saving transformers generally, and PECO differs in degree rather than in kind. We do not publish harmonic reduction figures, and PECO is not offered as a harmonic filter. Where a facility has a specific harmonic requirement, it should be addressed with equipment designed for that purpose.

For the same rating, yes. More conductor is used, because the main winding is not asked to provide the step-down as well. Current density is lower as a result, and so is the resistance the device adds to the circuit. It was a deliberate design choice.

No. PECO is connected as three-phase, three-wire. The system neutral bypasses the unit and connects directly to the distribution boards.

It is the design condition for the transformer architecture. Output is approximately 96 % of input, without tap changing. The voltage difference is not, on its own, the explanation of the energy-saving result.

For a nominal 400 V system the output remains within the supply voltage range permitted by EN 50160 and IEC 60038. Voltage range and equipment requirements are reviewed before any proposal.

Yes. It is not recommended where supply voltage already operates near the lower permitted limit, where tightly regulated constant-power electronic loads dominate, where operation is highly intermittent, or where the distribution arrangement cannot accommodate a series-connected device.

Power passes through the Harmonic Energy Recycling Transformer before being supplied to the load. This is the normal operating position.

Power is supplied directly to the load without passing through the transformer — exactly as before installation.

The EOCR monitors load current. When the preset overload condition is detected, its contact operates the control circuit, which commands the ATS to transfer the load to the By-pass path. This operates under load.

Deliberate transfer between the two positions is performed at no load, during a scheduled window. Automatic transfer to By-pass under an overload condition is a separate protective function and operates under load.

No. The energy-saving function is performed passively by the transformer’s core and winding structure. The digital meter displays operating values but does not analyse or control the load.

Transformer efficiency is typically 99.8 % or higher, measured between 99.7 % and 99.83 % across models. Because the voltage difference is only 4 %, only a small fraction of throughput power is magnetically transformed — a 300 kVA unit uses a 180 kg transformer. Winding loss, core loss and heat are therefore low.

Passive operation with no consumable parts and no software. Visual inspection, keeping the enclosure and ventilation clear, checking bolted joints, confirming the fan responds to its thermostat setting, and verifying input and output voltages. Intervals follow the facility’s own maintenance policy.

Three years on the Harmonic Energy Recycling Transformer and one year on switching and protection components, from the date of installation.

We do not publish a fixed saving percentage. Results depend on load composition, operating hours, phase balance and harmonic conditions. Savings are measured on site in accumulated kWh under agreed comparison conditions.

In accumulated kWh at the metering point that determines the electricity bill, over comparable operating periods. Operating hours, load level, occupancy or production volume, ambient conditions and the measurement boundary must all be considered.

Yes. Because the system includes an automatic transfer switch, the facility can be operated alternately through the Saving and By-pass paths and compared on the same meter, without a modelled baseline. Transfers are performed at no load during scheduled windows.

No. Facility names, consumption data and verification reports belong to the customer. Reference information is provided only under a non-disclosure agreement.

In some markets customers have used verified savings documentation to support applications to national energy-efficiency incentive schemes. Eligibility, procedures and approval are determined solely by the relevant national authority.

Hotels typically operate continuous mixed loads — chillers, air handling, pumps, refrigeration, kitchens, laundry, lifts and lighting — together with a large population of single-phase electronic loads on guest floors. This suits the equipment well. Final suitability is confirmed by technical review.

According to transformer rating, maximum load current, voltage, frequency and load composition. The PECO rating is normally matched to the rating of the facility transformer.

Series connection between the main circuit breaker and the sub-distribution boards, requiring a planned outage of the main distribution. Duration depends on cable and busbar work at the site and is estimated during technical review.

An Attestation of Conformity issued by TÜV SÜD Product Service GmbH under the Low Voltage Directive 2014/35/EU, tested to EN 62477-1, covering all 39 models from 100 to 3,000 kVA at 380–480 VAC. ATECELECTRIC holds ISO 9001 and ISO 14001, and the winding architecture is protected by Korean Patent 10-2546570.

No. Manuals, wiring diagrams, control circuit drawings and project-specific drawings are provided to qualified customers and project partners after technical review.