A power supply system for an electric heater of a heating furnace

By using three-core cables and phase-separation junction boxes in the power supply system of the electric heater of the heating furnace, the problems of eddy currents and electromagnetic interference caused by the three-phase current imbalance of single-core cables are solved, achieving uniform heat dissipation and electromagnetic compatibility of the cables, reducing costs and extending service life.

CN224502899UActive Publication Date: 2026-07-14CHANGZHENG ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHANGZHENG ENG
Filing Date
2025-05-26
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In the existing power supply system for high-power electric heaters, unbalanced or improperly arranged three-phase currents in single-core cables can lead to eddy currents, localized overheating, insulation aging, and short-circuit risks. In addition, the cost is high, and long-distance single-core cables experience significant temperature rise, reducing their service life.

Method used

Three-core cables are used to transmit power to the phase-separation junction box. A bracket is set outside the phase-separation junction box to separate the single-core cables in a triangular pattern. The single-core cables after phase separation are laid according to differentiated winding paths and arranged in a triangular pattern to ensure uniform cancellation of the magnetic field and reduce eddy current loss and electromagnetic interference.

Benefits of technology

It significantly reduces the eddy current effects caused by three-phase current imbalance or improper arrangement in long-distance single-core cables, saves cable laying costs, and achieves balanced heat dissipation and electromagnetic compatibility of the cable.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224502899U_ABST
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Abstract

The utility model discloses a kind of power supply systems for heating furnace electric heater, electric heater includes first phase, second phase, and three independent terminal boxes of third phase, power supply system includes power regulating cabinet and phase conversion box, power regulating cabinet is transmitted to phase conversion box by three-core cable;Phase conversion box is close to second phase terminal box;Phase conversion box is connected by 2N single-core cable respectively with first phase terminal box, second phase terminal box, third phase terminal box, and N is natural number.In the utility model scheme, from power regulating cabinet to phase conversion box long distance adopts three-core cable transmission, can significantly reduce long distance and produce eddy current due to three-phase current imbalance or improper arrangement using single-core cable, and cable laying cost is saved;Three-core cable is converted into single-core cable by phase conversion box, meet heater phase supply, and by setting the arrangement mode of single-core cable, magnetic field is mutually offset, reduce eddy current loss influence.
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