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Impact of environment to power quality

Impact of environment to power quality

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What is power quality?


According to Wikipedia, power quality refers to the degree to which the voltage, frequency, and waveform of a power supply system conform to established specifications. Good power quality can be defined as a steady supply voltage that stays within the prescribed range, steady AC frequency close to the rated value, and smooth voltage curve waveform (which resembles a sine wave). Poor power quality can cause electrical devices to malfunction, fail prematurely, or not operate at all. There are many ways in which electric power can be of poor quality, and many more causes of such poor-quality power. The electric power industry comprises electricity generation (AC power), electric power transmission, and ultimately electric power distribution to an electricity meter located at the premises of the end user of the electric power. The complexity of the system to move electric energy from the point of production to the point of consumption combined with variations in weather, generation, demand, and other factors provide many opportunities for the quality of supply to be compromised.

If you would like to learn more about power quality, I recommend visiting Electrical Workbook, which provides a comprehensive explanation of the symptoms, effects, and standards of poor power quality with examples and diagrams.


What are some common causes of poor power quality?

  • Voltage sag: A decrease in the normal voltage level between 10% and 90% of the nominal rms voltage at the power frequency, for durations of 0.5 cycle to 1 minute. This can be caused by faults on the transmission or distribution network, faults in consumer’s installation, connection of heavy loads, and start-up of large motors.

  • Harmonic distortion: The presence of unwanted harmonics in the power supply system, which can cause additional stress on the networks and systems, causing them to operate less efficiently. Harmonic distortion can be caused by non-linear loads, such as variable frequency drives, computers, and other electronic equipment.

  • Excessive reactive power: The charging of useless power to the system, which can cause additional stress on the networks and systems, causing them to operate less efficiently. Excessive reactive power can be caused by the connection of large motors, transformers, and other inductive loads.

Other causes of poor power quality include voltage swell, voltage spike, noise, voltage unbalance, long interruptions, and very short interruptions. If you would like to learn more about power quality, I recommend visiting Electrical Workbook, which provides a comprehensive explanation of the symptoms, effects, and standards of poor power quality with examples and diagrams.

Can we monitor environment to prevent power quality events?

Monitoring the environment can help prevent power quality events caused by lightning, wind, and rain that can cause power outages, voltage sags, swells, and transients that can damage electrical equipment. Here are some benefits of monitoring power quality:


1. Baseline incoming power: Power quality monitoring products can provide a baseline for incoming power to help identify conditions that might contribute to motor failure.


2. Trend parameters: Power quality monitoring products can help trend parameters that could lead to long-term degradation and provide data to reduce energy consumption.


3. Appropriate protection: Power quality monitoring products can provide appropriate protection to equipment and help identify suitable mitigation techniques that improve power quality.


4. Capacity planning: Power quality monitoring products can help understand capacity and develop an accurate load profile for equipment.


5. Decrease unintentional power overloads: Power quality monitoring products can keep loads balanced and proactively manage allocation, which helps decrease unintentional power overloads.


6. Prevent unplanned downtime: Power quality monitoring products can ensure equipment operates as it should without any power-related issues and prevent unplanned downtime.


7. Improve energy efficiency: Power quality monitoring products can improve energy efficiency by preventing inconsistent loads that can cause surges that can degrade the internal circuits of electrical equipment.


By monitoring the environment, you can help prevent power quality events from nature and protect your electrical equipment.




Source: Microsoft Bing


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