Question: How to deal with power supply harmonic interference? Will it affect the factory's power grid and other precision instruments?

Detailed Answer:

In modern factories, "electrical civilization" of large equipment is crucial. Harmonic interference is often referred to as "grid pollution." It can lead to increased electricity costs, equipment malfunctions, and even damage. We understand your concerns and provide clear solutions.

I. The Optimal Choice: Eco-Friendly IGBT Power Supply

If your graphitization furnace uses an IGBT medium-frequency power supply, concerns about harmonic interference can be significantly reduced.

· Working Principle Advantage: As a fully-controlled device, the operating principle of IGBTs determines that they inherently generate almost no significant harmonic interference.
· Conclusion: Graphitization furnaces using IGBT power supplies can be considered grid-friendly equipment. They require no additional expensive harmonic mitigation devices and typically do not affect the normal operation of other equipment on the same line within the factory, saving you the cost and hassle of subsequent treatment.

II. Traditional Solution: Harmonic Response for SCR Power Supplies

If an SCR power supply is selected for specific considerations, we must objectively acknowledge that it does generate a certain amount of harmonics during operation.

· Mandatory Solution: For SCR power supplies, we strongly recommend and require customers to install harmonic mitigation and dynamic reactive power compensation devices (commonly known as SVG or APF) in the factory's main distribution room, dedicated to the furnace's transformer or line. This system monitors and cancels out the harmonics generated by the equipment in real-time, ensuring the current injected into the grid is "clean."

III. Ultimate Protection Recommendations for Precision Instruments

Regardless of the power supply type, if your workshop also operates precision instruments highly sensitive to power quality (such as high-precision measuring equipment, electron microscopes, spectrometers, etc.), we recommend the most reliable isolation measures:

· Independent Transformer Power Supply: Set up a dedicated independent transformer for the graphitization furnace, completely separating its power supply lines from those serving precision instruments.
· Early Communication: Please communicate thoroughly with our technical staff during the initial project planning stage. Based on your grid environment and equipment layout, we will provide professional electrical design advice to avoid potential interference at the source.

The above technical article is exclusively written by Yuanhang Industrial Furnace Company. Reproduction is prohibited.