Power is an indispensable aspect of existence in the modern world. Constantly, we are surrounded by objects that are powered in some way. To offer reliable and economical electricity, we must utilize the most advanced power systems. Harmonics raise the RMS of the current flow in the circuit, resulting in an increase in loss, which has resulted in a number of power system difficulties. Harmonics may have an effect on both the loads and the distribution system as a whole. Harmonics may cause damage to delicate appliances and equipment in your industrial or commercial business. In some instances, the presence of a harmonic breakdown is not readily visible and cannot be separated from the appliance’s regular aging.
Harmonic Distortion Definition:
If harmonic difficulties emerge, they may have a little effect on the reliability of the power supply. Harmonics in the electric current and voltage are the root cause of power system issues. High harmonic levels in power systems can cause equipment damage or destruction.
A nonlinear load commonly adds to harmonics, or distortion of the current waveform, in an electrical system. In power systems, personal computers, variable speed motors, driven motors, fax machines, laser printers, Switch-mode power supplies (SMPS), batteries, and uninterruptible power supplies are examples of non-linear loads and harmonically generated loads (UPS (Uninterruptible Power Supplies)).
Harmonic Analysis's Relevance:
Harmonics have a negative impact on the performance and quality of electric systems. Using harmonic analysis to identify harmonics inside the power system will boost the system’s dependability. Utilizing modern power electronics equipment frequently results in nonlinear currents. Therefore, harmonics were produced because of the system stressors. Energy-efficient and energy-saving requirements must be met by all equipment.
When Did Harmonic Analysis Become Necessary?
- The harmonic limits must be evaluated if the measured load exceeds 25% of the overall load or bus system for the circuit.
- To handle harmonics-related problems like equipment failure and damage.
- When the new capacitor bank is linked to the electrical systems, a harmonic analysis is necessary.
- The date the plant will be expanded and the number of non-linear loads that will be added.
| Type of the apparatus | Results in harmony |
|---|---|
Rotating machinery |
Higher cable resistance, power loss, overheating, and pulsing torque. |
Electricity wires, switchgear, and A transformer |
Excessive consumption, overloading the neutral, overheating, and power losses |
Electrical capacitors |
A failure with high current |
Electric force |
Inefficiency and shortcomings |
Relay protection |
Mistakes and inconvenient trips |
A nonlinear load interacts with a sinusoidal waveform, creating distortion and harmonics in the system. When it is necessary to assess whether a system has harmonics, harmonic analysis is typically required.
Power System Harmonics Mitigation Advantages:
- By decreasing the power losses of cables, switch gears, and safety devices, harmonic analysis reduces operating expenses. In addition, it helps reduce power system losses.
- It aids in reducing transformer oversizing and RMS current in the power system, hence decreasing the demand for cable, switchgear, and busbars.
- Business performance: Immediately after reducing losses and the RMS current value, performance is enhanced. Harmonics result in increased losses, a higher current RMS value, and overheating of cables, transformers, motors, and capacitors. The unfavorable results may lead you to abandon the surgery and incur a financial loss.
Methods for Evaluating Power Quality:
- Obtain the one-line graphic to emphasize the nonlinear loads.
- Maintain vigilance over the common connection point (PCC).
- Calls attention to the plant buses that might be affected by harmonics.
- Compile all available information on non-linear loads and the utility’s previous harmonic performance.
- Create a mockup using the ETAP program and the electrical system’s performance.
- Evaluate the level of voltage and current distortion and perform research and harmonic analysis.
- If harmonic distortion exceeds the acceptable threshold, select a method for its reduction.
- After utilizing the mitigation technique to check CEC compliance, rerun the harmonic analysis.
To ensure the safety of your electrical equipment and give you a dependable working environment, CareLabs equips its employees with the latest technology. Learn more about CareLabs‘ harmonic research and analysis services by requesting a quotation.
