China Electronics Technology Group Project

This project sits in a manufacturing environment dominated by high-power thermal processes and continuous auxiliary systems. The production line includes single crystal furnaces and multiple supporting furnaces (synthesis, tube sealing, purification), combined with variable-speed HVAC units and crystal processing equipment—an electrical profile that is fundamentally different from conventional factories.

The defining feature is the furnace load: many single crystal furnaces use thyristor-controlled high-frequency heating, which is energy-intensive and creates complex current waveforms. In practical terms, these loads do not draw power smoothly; they draw it in pulses, and that behavior introduces harmonic currents into the plant distribution system. In this kind of facility, power quality problems don’t remain “power quality problems.” They turn into operational losses.

To eliminate harmonic pollution, improve the grid environment, prevent upstream harmonic injection, and protect safe operation, the project adopted our Hybrid Dynamic Filter Compensation system, installed on the transformer busbar with a total capacity of 4150A.

It is designed as a hybrid approach that integrates passive filtering/compensation with active dynamic filtering, so the site gains both scale and responsiveness:

• High-capacity “bulk” harmonic handling: The passive section carries the heavy lifting efficiently—well suited to high-current environments dominated by furnace loads.

• Dynamic cleanup for changing conditions: The active section addresses residual and time-varying distortion that appears as loads ramp and multiple processes overlap.

• Practical engineering for industrial sites: Modular passive design supports installation and maintenance efficiency, while active filtering control provides stronger adaptability as the electrical environment changes through production cycles.

This is the logic behind the system choice in a project like this: it establishes a stable baseline at large capacity, then actively manages what cannot be solved efficiently with a single approach alone.

With our Hybrid Dynamic Filter Compensation Device deployed at the main transformer busbar, the facility strengthened its power-quality baseline under heavy furnace operation—reducing harmonic pollution that previously distorted voltage waveforms and contributed to false trips, instrument anomalies, and accelerated electrical wear. The practical result is a cleaner and more stable electrical environment that better protects production continuity, reduces routine maintenance pressure, and lowers the risk that the plant’s harmonic currents propagate into upstream systems.