Zero Line Filter Unit Price - Shaoyang Zero Line Current Filter

The ZJKF-NPF neutral current filter produced by Zhejiang Kefiler is a product specifically developed for venues such as shopping malls, LED displays, LED lighting, engineering projects, server rooms, battery capacitance testing equipment, switch power supply aging, virtual mines, and more.
Product Overview
The ZJKF-NPF neutral current filter produced by Zhejiang Kefile is a product specifically developed for targeted applications such as shopping malls, LED displays, LED lighting, engineering projects, server rooms, battery capacitance testing equipment, switch power supply aging, virtual mines, and more.
In traditional power systems, electrical equipment with linear impedance characteristics does not interfere with the standard sine waveform of the power supply at 50Hz. However, with the rapid development of modern power electronics technology, electrical equipment with nonlinear impedance characteristics (also known as nonlinear loads) is increasingly used. These nonlinear loads cause distortion in the power system's supply frequency and waveform, from which different frequency sine waves can be extracted. This portion of extracted AC sine waves that are not 50Hz is collectively referred to as harmonics. The harmonic with a frequency three times that of 50Hz, or 150Hz, is called the 3rd harmonic; the harmonic with a frequency five times that of 50Hz, or 250Hz, is called the 5th harmonic; and the harmonic with a frequency seven times that of 50Hz, or 350Hz, is called the 7th harmonic.

Years ago, the harmonic mitigation industry was unheard of. To this day, when industrial sites encounter interference faults, the power management personnel often reflexively think it must be harmonics causing the issue. The shift from the industry being ignored to now being a "blossoming field" of competition among various companies illustrates that the industry has gained recognition and is well-known. Harmonic mitigation equipment has also undergone continuous reform, evolving from initial passive filters to today's active filters, and now focusing on the Zero Line Filter product.

Application Scenario
LED energy-saving lamps, LED displays, chargers, heaters, inverters, sterilizers, and PC terminals with single-phase two-tube rectification nonlinear loads generate significant odd-order harmonic currents during operation. The 3rd harmonic is the largest, being the primary harmonic component, with the 5th, 7th, 11th harmonics also notably high. However, the 3rd harmonic current does not vectorially cancel out most of the way on the neutral line like the fundamental and 5th, 7th, 11th harmonic currents do. Instead, it is completely superimposed on the neutral line at a 360-degree vector angle, resulting in the 3rd harmonic current on the neutral line being about three times that on the phase line. Therefore, when the 3rd harmonic current content of a single-phase rectification load reaches over 35%, the neutral line current becomes abnormally high, exceeding the phase line current. In many cases, the neutral line current becomes about twice the phase line current, causing various hazards to the low-voltage distribution system. The main phenomena include the following aspects:
1) Overcurrent in the neutral wire causes overheating: This leads to cable heating, aging, and fracturing, which not only directly damages electrical equipment but also easily triggers fire hazards that are difficult to inspect and control.
2) Abnormal tripping due to distribution protection: Even if the load on the line has not reached the designed capacity of the distribution system, a zero sequence protection trip may occur, leading to instability in the distribution system and affecting normal power supply.
3) Transformer Overheating and Abnormal Noise: A large amount of neutral harmonic current returns to the transformer, directly causing the transformer to overheat, generate noise, accelerate the degradation of transformer performance, shorten its lifespan, and in severe cases, directly leading to transformer burnout.
4) Significant Power Waste: The distribution system contains significant triple-frequency odd harmonic currents, which directly increase the electrical consumption of both load and power supply equipment, endangering the safe operation of reactive compensation equipment, leading to considerable power waste.

This physical quantity is typically observed on the neutral line. I can assure you that the level of the 3rd harmonic is directly proportional to the enterprise's safety hazard index. This is because the neutral line current is composed of two parts: 1. unbalanced current, and 2. 3rd harmonic current. The higher the 3rd harmonic, the higher the neutral line current, which in turn increases the fire safety hazard for the enterprise!
Performance Features
Modular design adopted; compact and lightweight, with easy capacity expansion and selection, as well as convenient handling and installation.
② The modular housing is made of stainless steel with anti-corrosion, rust-proof, and anti-magnetic interference properties, suitable for various installation sites.
③ The governing device features operational status indicator lights, automatic temperature control for cooling fans, and a bypass switch backup function.
④ Simply connect to the ABC phase lines, it can simultaneously receive protection from various load phase lines, offering strong safety and high reliability.
The governing device features highly automated performance with instant connection, immediate use, and visible effects, without the need for additional control systems or complex manual adjustments.
⑥ It not only significantly reduces the 3rd harmonic current on the neutral wire but also synchronously diminishes the odd harmonics at the 9th and 15th frequencies, which are the triple-frequency harmonics that accumulate on the neutral wire.
Under the operating condition where the three-phase current is relatively balanced, the elimination rate of the third harmonic odd-order current on the neutral line reaches over 85%.