What is Harmonic Study and Analysis and Why is it Done?
What is Harmonic Study and Analysis and Why is it Done?
The rapid growth in electronic devices in recent years has significantly changed the types of loads connected to the electrical distribution system. Not long ago, the primary concern when using electricity was simply the voltage, ensuring that equipment and devices operated correctly.
Today, modern devices equipped with electronics provide increased performance in various tasks and processes, but they also introduce new challenges.
These devices, such as computers, air conditioning units, lifts, and variable speed drives, contain components like promoters and modulators that distort the current waveform to function properly. This distortion can lead to several technical and economic issues within our electrical installations.
Technical Costs of Harmonic Distortion:
- Loss of Capacity on Energy Distribution Line
- Transformer Overload
- Conductor Overload
- Voltage Drop
- Derating of Transformers
- Losses on Lines and Machines because of Joule’s Effect
- Magnetic Losses on Electrical Machines
These technical costs often translate into economic costs, which can be categorized into hidden costs and visible costs:
Economic Costs:
- Increased Electricity Consumption
- Electricity Consumption Peaks
- Surcharges for Reactive Energy
- Distribution Losses
- Power and Energy Losses (Because of Joule Effect and Magnetic Losses)
- Enlargement of Installations
- Stoppage of Productive Processes
The effects of voltage and current harmonics in a power system can be significant, including:
- Resonance Leading to Harmonic Amplification
- Reduced Performance in Generation, Transport, and Energy Usage Systems
- Aging of Grid Insulation and Reduced Energy Efficiency
- Malfunctioning of Systems or Their Components
Understanding these effects requires a knowledge of harmonics, which are produced by non-linear loads that draw non-sinusoidal currents.
Common non-linear loads include:
- Frequency/Variable Speed Drives
- Discharge Lamps (High Pressure Sodium Vapor Lamp, Mercury Vapor Lamp, Fluorescent)
- Rectifiers
- AC/DC Converters
- Arc Welding Equipment
- Induction Ovens
- UPS Systems
- Computers and Laptops
Harmonics distort the normal electrical waveform, and their impact can be measured as Total Harmonic Distortion (THD). Non-linear loads, such as switch-mode power supplies, variable speed drives, photocopiers, computers, and laser printers, create significant distortion. This distortion can travel back into the power source, affecting other equipment connected to the same source.
Common Problems Caused by Harmonics:
- Overheating of Electrical Distribution Equipment, Cables, and Transformers
- High Voltages and Circulating Currents Due to Harmonic Resonance
- Equipment Failure Due to Excessive Voltage Distortion
- High Internal Energy Losses in Connected Equipment
- False Tripping of Circuit Breakers
- Metering Errors
- Fires in Wiring and Distribution Systems
- Generator Failures
- Lower System Efficiency
Traditional transformers are not designed to handle the high harmonic currents produced by non-linear loads, leading to overheating and premature failure. In response, the industry has developed K-rated transformers, which are designed to manage the heat produced by harmonic currents.
K-Rated Transformers:
- K-rated transformers are designed to handle the additional heat from harmonic currents.
- The K-factor ranges from 1 to 50, with higher ratings indicating greater capacity to handle harmonic heat.
Harmonic Mitigating Transformers:
- Harmonic Mitigating Transformers (HMTs) are designed to reduce voltage distortion and power losses caused by harmonics.
- Eaton’s energy-efficient HMTs address triplen harmonics and other harmonic issues through advanced electromagnetic techniques.
- HMTs maintain high energy efficiency even under severe non-linear loading conditions.
Advantages of Using Harmonic Mitigating Transformers:
- Prevents Voltage Flat-Topping
- Reduces Upstream Harmonic Currents
- Eliminates Transformer Overheating and High Operating Temperatures
- Eliminates Primary Winding Circulating Currents
- Saves Energy by Reducing Harmonic Losses
- Maintains High Energy Efficiency
- Addresses Power Quality Issues that K-Rated Transformers Do Not
- Suitable for High K-Factor Loads Without Increasing In-Rush Current
- Improves Power Factor
Introducing Our Low Voltage Power Quality Products
At YT Electric, we specialize in providing innovative solutions to manage and mitigate power quality issues. Our range of low voltage power quality products is designed to address the challenges posed by harmonics and other electrical disturbances, ensuring efficient and reliable operation of your electrical systems.
Our Products Include:
- Active Power Filters (APF): Designed to reduce harmonic distortion and improve power quality.
- Static Var Generators (SVG): Used for reactive power compensation to stabilize voltage levels.
- Energy Storage Systems (ESS): Provide backup power and improve energy efficiency.
- Intelligent Energy Management Systems (EMS): Optimize energy usage and reduce working costs.
Advantages of Our Products:
- High Efficiency and Reliability
- Customizable Solutions to Meet Specific Needs
- Advanced Technology for Optimal Performance
- Enhanced System Stability and Power Quality
- Energy Savings and Reduced wokring Costs
We invite you to explore our range of power quality products and experience the benefits of improved energy efficiency and system reliability. For more information or to discuss your specific requirements, please contact us.
Contact Us Today to learn more about how our products can enhance your electrical systems and provide sustainable energy solutions.
Email: sales@intonepower.com
WhatsApp: +86-15021981917
Address: S4-2F, No.777 SIZHUAN RD, SONGJIANG DISTRICT, SHANGHAI. P.C.: 201601.