Product Overview:

The single-phase harmonic filter is a specialized power quality improvement device developed for 220V/230V, 50/60 Hz single-phase AC distribution systems. It precisely addresses power quality issues caused by single-phase non-linear loads, including harmonic distortion, excessive neutral current, voltage waveform distortion, and low power factor. Built upon a proven filtering topology, the filter effectively suppresses low-frequency odd-order harmonics—particularly the 3rd, 5th, and 7th orders—and is well-suited for residential, commercial, and small-to-medium industrial single-phase applications. It purifies grid wave forms, stabilizes power supply quality, and eliminates potential risks such as equipment malfunctions, excessive energy consumption, and line overheating induced by harmonics. This solution offers a lightweight, highly adaptable optimization for single-phase power quality.

Working Principle:

The passive single-phase harmonic filter employs a high-precision LC resonant filtering circuit based on a mainstream T-type topology. Targeting the high-frequency harmonic characteristics of single-phase loads, it provides low-impedance bleed paths for specific harmonic frequencies, actively filtering out harmonic currents and spurious interference in the circuit while preserving normal transmission of the power-frequency fundamental. This effectively reduces harmonic distortion at the source.

Installation and Maintenance:

The device supports standard DIN-rail mounting or wall-mounting, with no need to modify the existing power distribution system. It can be put into operation simply by connecting it in series with the front-end distribution circuit of the single-phase load. Installation is straightforward and construction is efficient. The unit is designed for 7×24 hours of uninterrupted, stable operation with virtually zero maintenance, ensuring safe and reliable performance.

Product Value:

Through efficient harmonic mitigation, this filter effectively purifies the single-phase supply grid, reduces line and equipment power losses, minimizes electrical waste, and improves overall energy efficiency. It thoroughly resolves problems caused by harmonics—such as frequent equipment failures, trip-induced shutdowns, metering errors, and accelerated cable aging—dramatically lowering operation and maintenance costs and reducing downtime losses. It safeguards the stable operation of precision equipment, fully complies with national power quality standards, and helps users achieve the core objectives of safe, energy-efficient, and stable power consumption.

Core Advantages:
· Precise and efficient filtering: Specifically targets typical 3rd-order zero-sequence harmonics and higher-order harmonics of single-phase loads, achieving a harmonic mitigation rate of ≥85%. It can limit the system THDi (Total Harmonic Distortion of current) to within 15%, significantly improving grid waveform quality and effectively resolving issues such as neutral overload, abnormal noise, and overheating of equipment.
· Wide adaptability: Covers full-range rated currents from 6A to 63A, suitable for various non-linear single-phase loads including LED lighting, displays, single-phase frequency converters, rectifiers, temperature-controlled heaters, and small industrial control equipment. Compatible with both steady‑state and dynamically fluctuating load conditions.
· Stable energy saving and loss reduction: Effectively reduces harmonic losses in lines and no-load losses of equipment, improves system power factor, and minimizes reactive power losses and electricity cost waste. Eliminates problems caused by harmonics such as cable aging, circuit breaker nuisance tripping, and inaccurate metering, thereby extending the service life of downstream electrical equipment.
· Lightweight and modular design: Compact overall size and light weight, with an integrated modular structure that offers flexible capacity combinations and easy expansion. The enclosure is made of high-quality corrosion-resistant and anti‑magnetic metal material, providing strong interference immunity and corrosion resistance. Suitable for various indoor installation environments, with simple wiring and convenient assembly and disassembly.
· Intelligent, safe, and reliable: Equipped with automatic temperature-controlled cooling and an over-temperature alarm output signal.
· Free of Maintenance and low cost: As a passive type, it contains no delicate wear‑prone components and requires no frequent adjustment or calibration, resulting in extremely low post-installation operation and maintenance costs.

Core Technical Parameters:

Typical Application Scenarios:
Broadly suited for centralized power consumption scenarios with various single-phase non-linear loads. Core application areas include: LED lighting and large‑screen systems in commercial complexes, shopping malls, and office buildings; power distribution systems in hotels and apartment buildings; household and commercial precision electrical equipment; small industrial automation and control equipment; single-phase variable-frequency drive systems; temperature-controlled heating equipment; small precision medical instruments; semiconductor manufacturing equipment; and security monitoring power supply systems. The filter effectively resolves industry pain points such as harmonic superposition, excessive neutral current, grid pollution, and poor equipment stability caused by parallel operation of multiple single‑phase non‑linear loads.