Why Detect and Eliminate Harmonics？

Understanding Harmonic Disturbances

Harmonics in electrical distribution networks represent significant disturbances that can degrade the quality of electrical power and reduce system efficiency. These disturbances, caused by non-linear loads, introduce unwanted frequencies into the power system, resulting in several adverse effects.

Main Risks Linked to Harmonics

1. Overload of Distribution Networks: Harmonics can increase r.m.s. This extra load can make cables and transformers overheat, increasing the chance of insulation failure and reducing their lifespan.
2. Neutral Conductor Overload: Harmonics can cause the current in neutral conductors to exceed the phase currents. Excessive electricity can lead to overheating and fire hazards.

This is particularly true in three-phase systems that have trippen harmonics in the neutral conductor. Trippen harmonics can cause electrical systems to overheat and increase the risk of fires.

1. Harmonics can cause equipment to age faster. This can lead to generators, transformers, and motors vibrating excessively, overheating, and experiencing mechanical stress. This not only reduces their operational lifespan but also leads to higher maintenance costs and more frequent downtime.
2. Factor Correction Capacitor Stress: Harmonic currents can overload power factor correction capacitors, causing them to age prematurely. The added heat can result in dielectric breakdown and eventual capacitor failure.
3. Voltage Distortion: Harmonics can distort the supply voltage, which may cause sensitive equipment to malfunction. This issue can make computers and PLCs behave erratically. It may lead to data loss and disruptions in processes.
4. Communication Network Interference: Harmonics can interfere with communication networks and telephone lines, creating noise and signal disturbances that degrade system performance.

Economic Impact of Harmonic Disturbances

The economic implications of harmonic disturbances are profound and complex. Understanding these impacts can help businesses justify investments in harmonic mitigation solutions.

1. Premature Equipment Replacement: Increased wear and tear mean equipment needs replacement sooner unless initially oversized, which is costly. Regular replacements increase capital expenditure and can disrupt operations.
2. Higher Equipment Ratings: Overloads necessitate higher equipment ratings, increased subscribed power levels, and higher power losses. This raises upfront costs and leads to higher ongoing expenses because of more energy use and lower efficiency.
3. Production Interruptions: Current distortions can cause nuisance tripping, halting production and leading to costly downtime. For industries relying on continuous processes, even short interruptions can result in significant financial losses and reduced productivity.

The Importance of Harmonic Mitigation in Electrical Installations

With the proliferation of power electronic devices for precise process control and energy savings, harmonics have become more prevalent. Devices such as Variable Speed Drives (VSDs), UPS, and energy-efficient lighting systems contribute significantly to harmonic generation.

Common Sources of Harmonics

• Variable Speed Drives (VSDs): Widely used in industrial applications to control motor speeds, VSDs are significant sources of harmonics.

• Compact Fluorescent Lamps (CFLs): Common in commercial and residential areas, these lamps introduce harmonics into the electrical system.

• UPS Systems: Essential for providing backup power, UPS systems often generate harmonics during normal operation and battery charging phases.

International Standards and Solutions

Global standards such as IEEE 519 and IEC 61000 have set limits on harmonic emissions. These boundaries are set to prevent unforeseen adverse outcomes. The goal is to address and resolve these issues. These standards guide the design and operation of equipment to ensure fit with power systems and minimize harmonic pollution.

Key International Standards

• IEEE 519: Provides guidelines for harmonic control in electrical power systems.
• IEC 61000: Focuses on varied fit and defines limits for harmonic currents produced by equipment.

Solutions for Harmonic Mitigation

1. Active Power Filters (APFs): APFs provide real-time correction of harmonic distortions by injecting counteracting currents into the system. They are highly effective in dynamic load environments.
2. Hybrid filters combine passive and active filtering techniques to reduce harmonics. This makes them a versatile choice for various applications. They are effective in minimizing unwanted electrical disturbances. Hybrid filters are suitable for a wide range of uses because of their flexibility.

Our Advanced Solutions for Harmonic Mitigation

At YT Electric, we focus on advanced solutions to reduce electrical noise, customized to fit our clients' specific requirements. We design our products and services to enhance power quality and ensure the efficient, reliable operation of electrical systems.

Our Key Offerings

1. Active Harmonic Filters (AHF): Our AHFs provide real-time correction of harmonic distortions, improving power quality and system efficiency. They are ideal for industrial and commercial applications with varying load conditions.
2. Custom Solutions: We offer tailored solutions to meet specific customer needs, ensuring optimal performance and cost-effectiveness. Our team works closely with clients to understand their challenges and develop bespoke solutions.

Case Studies

• Case Study 1: using APFs in a factory resulted in a 40% decrease in harmonic distortion. Additionally, there was a 15% increase in energy efficiency.
• Case Study 2: Custom harmonic mitigation solution for a data center, leading to improved reliability and reduced downtime.

Conclusion

Addressing harmonic disturbances is crucial for maintaining power quality, extending equipment life, and ensuring the efficient operation of electrical systems. At YT Electric, we promise to discover new methods for controlling harmonics. We also aim to enhance the performance and reliability of your power systems.

Investing in our advanced harmonic mitigation technologies can benefit businesses in several ways. It can help them save money, operate more efficiently, and ensure a reliable power supply.

Any question about AHF &SVG, pls contact: sales@yt-electric.com