In daily electricity use, we often focus on the safety of the phase line, but easily overlook a potential "danger line" - the neutral line. In recent years, electrical fire accidents caused by excessive neutral current have occurred frequently, posing a serious threat to people's lives and property safety.

1. Neutral wire overcurrent: a fire hazard that cannot be ignored

Nonlinear load devices such as energy-saving lamps, LED displays, and computers are widely used in shopping malls, theaters, sports centers, data centers, hospitals, and other places. These devices generate a large number of 3N harmonics (such as 3rd, 9th, and 15th harmonics) during operation, and the problem of three-phase imbalance can also lead to an abnormal increase in neutral line current.

Excessive neutral current can directly cause overheating of the circuit, aging of the insulation layer, and even lead to fires. In traditional power distribution systems, the neutral wire section is usually only half of the phase wire. When the current approaches or even exceeds the phase wire current, danger is imminent.

2. Working principle of zero line current processing system

AcrelZero line current processing systemBy collecting information on various harmonic currents on the neutral line of the system through the current detection link, the controller quickly calculates and extracts the content of each harmonic current, generates harmonic current commands, and generates compensation currents with the same amplitude and opposite direction as the harmonic currents through power execution devices, which are injected into the neutral line to eliminate excessive currents in the neutral line.

(: Schematic diagram of the working principle of the midline security protector, showing the process of current detection, controller calculation, and compensation current injection)

purification effect

3. Technical highlights

• Fast response: millisecond level response speed, full response time ≤ 5ms, instantaneous response ≤ 100 μ s, quickly cut off the fault circuit-

• Accurate compensation: Harmonic compensation current range 0-200A, dynamically adjustable-

• Multiple protection: Supports independent setting of overcurrent threshold and provides protection functions such as overvoltage and undervoltage-

• Intelligent management: supports remote monitoring through mobile APP, can be connected to AcrelEMS energy efficiency management platform, and realizes visualization of power quality data
  

  

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4. Widely applicable scenarios: making electricity safer

Ankerui midline security protector is suitable for various fields with large 3N harmonics:

• Commercial centers: shopping malls, large supermarkets

• Public facilities: theaters, sports venues, hospitals

• Data hub: data center, communication base station

• Industrial sector: automobile manufacturing, steel and chemical enterprises

5. Practical application cases

In practical applications, the Ankerui midline security protector performs excellently:

• After installation in a shopping center, the harmonic distortion rate decreased from 28% to 4%, effectively ensuring the safety of electronic devices-

• After being used in the ICU ward of a certain hospital, the neutral line current decreased from 182A to 32A, and the line temperature rise decreased by 41 ℃-

• After the management of the automobile manufacturing workshop, the cable failure rate has been reduced to 0, and the production efficiency has significantly improved-
  

  

  
  

• Ankerui: an enterprise in the field of intelligent power distribution

Founded in 2003, Arcrui Electric Co., Ltd. is a key high-tech enterprise and software enterprise of the National Torch Plan. The company focuses on user end energy efficiency management and energy Internet, has one-stop service capabilities from cloud platform software to terminal components, and has formed a "cloud edge end" energy Internet ecosystem.

6. Conclusion

Neutral line safety is an important component of power system safety. With its advanced technology and reliable performance, the Ankerui ANS NP neutral line security protector provides an effective solution to eliminate the hidden dangers of neutral line overcurrent, helping enterprises achieve safe and efficient electricity use.

In today's era where electrical safety is increasingly valued, choosing the appropriate midline security products is like adding an extra line of defense for the safety of life and property, and safeguarding the stable operation of enterprises.