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[ { "title": "LEARN | Introduction to Power Quality part 3 - Harmonics", "nid": "426", "body": "\u003Cp\u003EOver the past few weeks, we\u2019ve discussed facets of \u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/index.php\u0022\u003EPower Quality\u003C/a\u003E in our new series.\u003C/p\u003E\n\u003Cp\u003EWe\u2019re just scratching the surface of Power Quality (PQ) to give you a basic understanding on the aspects that contribute to poor PQ, and what you can do about them:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--An-introduction-to-Power-Quality-part-1\u0022\u003E\u003Cstrong\u003EUnderstanding Power Quality\u003C/strong\u003E\u003C/a\u003E\u003C/li\u003E\n\u003Cli\u003EUnderstanding Power Quality issues and what to do about them:\u003Cbr /\u003E\n\t\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-2---Voltage-Instability\u0022\u003E\u003Cstrong\u003Ea) Voltage instability\u003C/strong\u003E\u003C/a\u003E\u003Cbr /\u003E\n\t\u003Cstrong\u003Eb) Harmonics\u003C/strong\u003E\u003Cbr /\u003E\n\t\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-4---Power-Factor\u0022\u003E\u003Cstrong\u003Ec) Poor power factor\u003C/strong\u003E\u003C/a\u003E\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp\u003EWe\u2019re resuming the series by briefly discussing \u003Cstrong\u003EHarmonics\u003C/strong\u003E\u2026\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWhat are Harmonics?\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThe Institute of Electrical and Electronics Engineers (IEEE) defines \u2018Harmonics\u2019 as sinusoidal currents or voltages with frequencies that are integer multiples of the fundamental frequency at which the power system is designed to operate. Therefore, harmonic distortion occurs when current or voltage waveforms assume non-sinusoidal shape. The waveform corresponds to the sum of different sine-waves with different magnitude and phase. They have frequencies that are multiples of power-system frequency.\u00A0\u00A0\u003C/p\u003E\n\u003Cp\u003ETo illustrate this, take the example of a 60-Hz system. The harmonic frequencies here are 120 Hz (2\u003Csup\u003End\u003C/sup\u003E Harmonic) and 180 Hz (3\u003Csup\u003Erd\u003C/sup\u003E Harmonic), etc. Harmonics combine with the fundamental voltage or current producing a non-sinusoidal shape. The result is a waveform distortion, which is a power quality problem. The non-sinusoidal shape corresponds to the sum of different sine waves with different magnitudes and phase angles, having frequencies that are multiples of the system frequency.\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022Harmonics 1\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00227dcf9a83-d41b-422d-be02-6037e8c8d78b\u0022 height=\u0022533\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/harmonics%20images-01.jpg\u0022 style=\u0022max-width:900px !important\u0022 width=\u0022626\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cfigure role=\u0022group\u0022 class=\u0022caption caption-img align-center\u0022\u003E\n\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022Harmonics 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00224bb7257d-b00c-451f-bf04-95afe3d13840\u0022 height=\u0022338\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/harmonic%20distortion-01.jpg\u0022 style=\u0022max-width:900px !important\u0022 width=\u0022649\u0022 /\u003E\u003C/a\u003E\n\u003Cfigcaption\u003E\u003Cem\u003EIllustrations explaining the harmonically distorted waveform\u003C/em\u003E\u003C/figcaption\u003E\n\u003C/figure\u003E\n\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ETotal Harmonic Distortion\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003ETotal Harmonic Distortion (THD) is commonly used as a measure of the effective value of harmonic distortion. Typically, the levels of harmonic distortion can also be characterized by the complete harmonic spectrum with magnitudes and phase angles of each harmonic component.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EThe causes of harmonics\u003C/strong\u003E\u003Cbr /\u003E\nHarmonic distortion can exist because of classic sources and modern sources.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EExamples of classic sources of harmonic distortion:\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EArc furnaces\u003C/li\u003E\n\u003Cli\u003ERectifiers\u003C/li\u003E\n\u003Cli\u003EDC brush motors\u003C/li\u003E\n\u003Cli\u003EWelding machinery\u003C/li\u003E\n\u003Cli\u003EGeneral electric machinery that operate above the knee of the magnetization curve (magnetic saturation)\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EExamples of modern sources of harmonic distortion - All non-linear loads such as:\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003ESwitched mode power supplies\u003C/li\u003E\n\u003Cli\u003EHigh efficiency lighting\u003C/li\u003E\n\u003Cli\u003EData processing equipment\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EHarmonics and Transformers\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EA transformer is an electrical apparatus designed to convert alternating current from one voltage to another. Transformers are designed to operate at a rated frequency, and designed with an overload margin. Typically, loads connected to transformers are non-linear, such as Variable Frequency Drives (VFDs), which generate harmonic currents and voltages. When combined with the non-linear nature of the transformer core, waveform distortions are created in currents and voltages, with the result being power losses.\u003C/p\u003E\n\u003Cp\u003EThe harmful effects of harmonic voltages and currents on transformer performance often go unnoticed until an actual failure occurs. In some instances, transformers that have operated satisfactorily for long periods have failed in a relatively short time when plant loads were changed or a facility\u0027s electrical system was reconfigured. The effect of harmonics is an increased heating in the transformer, compared to purely sinusoidal operation. Harmonics also result in lower efficiency, lesser capacity, reduced power factor, transformer overload, overheating of circuits, and eventually destruction of equipment.\u003C/p\u003E\n\u003Cp\u003EHigh harmonic levels generally also result in:\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EIncreased likeliness of resonance\u003C/li\u003E\n\u003Cli\u003EErrors in measurements when utilising average reading meters\u003C/li\u003E\n\u003Cli\u003ENeutral overload in three-phase systems\u003C/li\u003E\n\u003Cli\u003ENuisance tripping of thermal protections\u003C/li\u003E\n\u003Cli\u003ELoss of efficiency in electric machines\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EHarmonic Solutions\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EIn spite of all the concerns non-linear loads cause, these loads will continue to increase. Therefore, the application of non-linear loads such as variable frequency drives and the systems that supply them will require further scrutiny by the design professional.\u003C/p\u003E\n\u003Cp\u003EThe table below depicts a few harmonic solutions along with their advantages and disadvantages.\u003C/p\u003E\n\u003Cp\u003E\u003Cimg alt=\u0022Harmonic solutions\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022d4231318-2b77-4987-a236-da795f08fbd4\u0022 height=\u0022261\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/harmonics%20images-02.jpg\u0022 style=\u0022max-width:900px !important\u0022 width=\u0022454\u0022 class=\u0022align-center\u0022 /\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ETrust us for reliable Power Quality solutions\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003ENot sure what to do about your power quality issues? Then give us a call! We will recommend the best products and solutions to assist you in maintaining optimal power quality at your facility!\u003C/p\u003E\n\u003Cp\u003EClick \u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to chat to one of our experts now!\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EFollow our PQ Series\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EWe\u2019ll be wrapping up the series next week, by delving into power factor and the correction of poor power factor. Get this and more interesting articles straight to your inbox, click \u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to subscribe now!\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n", "created": "Sep 2020", "terms": "Electrical, Education" }, { "title": "LEARN | Introduction to Power Quality part 2 - Voltage Instability", "nid": "425", "body": "\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EIn the first article of our new series, we learnt that \u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/index.html\u0022\u003Egood power quality\u003C/a\u003E saves money and time, ensures a safer workplace, prolonged equipment life and increased efficiency. On the other hand, we also learnt that poor power quality often leads to reduced energy efficiency, and various other downsides.\u003C/p\u003E\n\u003Cp\u003EPower Quality has become increasingly prevalent in industry. Power Quality is also such a vast topic that can be discussed at length. We\u2019re just scratching the surface of Power Quality (PQ) to give you a basic understanding on the aspects that contribute to poor PQ, and what you can do about them:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--An-introduction-to-Power-Quality-part-1\u0022\u003E\u003Cstrong\u003EUnderstanding Power Quality\u003C/strong\u003E\u003C/a\u003E\u003C/li\u003E\n\u003Cli\u003EUnderstanding Power Quality issues and what to do about them:\u003Cbr /\u003E\n\t\u003Cstrong\u003Ea) Voltage instability\u003C/strong\u003E\u003Cbr /\u003E\n\t\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-3---Harmonics\u0022\u003E\u003Cstrong\u003Eb) Harmonics\u003C/strong\u003E\u003C/a\u003E\u003Cbr /\u003E\n\t\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-4---Power-Factor\u0022\u003E\u003Cstrong\u003Ec) Poor power factor\u003C/strong\u003E\u003C/a\u003E\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp\u003EWe\u2019re resuming the series by discussing issues around \u003Cstrong\u003EVoltage Instability\u003C/strong\u003E\u2026\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022Voltage instability\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022c06df5d9-3570-4d01-89da-b9beb6d85511\u0022 height=\u0022457\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/infograph-02.jpg\u0022 width=\u0022518\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EFrom the illustration above, you can see that there are a number of PQ issues involving voltage. While this list may not be exhaustive, in this article, we\u2019re giving you a basic understanding of the common voltage issues we see in the industry:\u003C/p\u003E\n\u003Cp\u003E1. Sags (or dips)\u003C/p\u003E\n\u003Cp\u003E2. Swells\u003C/p\u003E\n\u003Cp\u003E3. Spikes\u003C/p\u003E\n\u003Cp\u003E4. Unbalance\u003C/p\u003E\n\u003Cp\u003E5. Interruptions\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E1. Voltage Sags (or Dips)\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cimg alt=\u0022Voltage sag\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022e415aa38-275c-47cf-9729-73f9fedd20a2\u0022 height=\u0022291\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-sag.jpg\u0022 width=\u0022435\u0022 class=\u0022align-center\u0022 /\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EA voltage sag is also commonly known as a dip. A voltage sag refers to a short duration reduction in rms (root-mean-square) voltage. Typical causes of sags include starting electric motors, short circuits or overload.\u003C/p\u003E\n\u003Cp\u003EA voltage sag typically happens when the rms voltage decreases between 10% and 90% of nominal voltage for one half cycle (0.5) to one minute. A longer duration of low voltage is referred to as a \u2018sustained sag\u2019, or \u2018undervoltage\u2019.\u003C/p\u003E\n\u003Cp\u003EVoltage sags are said to be the most common power disturbance. Examples of the impact of sags include the malfunction of microprocessor-based control systems such as PLCs, and the tripping of contactors and electromechanical relays.\u003C/p\u003E\n\u003Cp\u003EOn a related note, a sag should not be confused with the term \u2018brownout\u2019, which describes the reduction of voltage for minutes, or even hours. \u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u003C/p\u003E\n\u003Cp\u003ETypical suggestions for decreasing the likeliness of sags include:\u003C/p\u003E\n\u003Cp\u003E- the use of power quality relays\u003Cbr /\u003E\n- switching power supply settings\u003Cbr /\u003E\n- reducing the load on your power supply\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E2. Voltage Swells\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022swell\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022a0a5e42a-30a6-4f27-9201-8d5ec6f25568\u0022 height=\u0022311\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-swell.jpg\u0022 width=\u0022429\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EA voltage swell is the opposite of a sag. A voltage swell describes the momentary increase in voltage at the power frequency, outside the normal tolerances.\u00A0 A swell can be defined as the increase in the rms voltage level to 110% - 180% of nominal. The duration of a swell is more than one cycle, and typically less than a few seconds. Longer periods of high voltage are referred to as \u2018overvoltage\u2019.\u003C/p\u003E\n\u003Cp\u003EThere are three types of voltage swells, namely \u2018Instantaneous\u2019, \u2018Momentary\u2019 and \u2018Temporary\u2019 \u2013 each characterized by their rms magnitude and duration.\u003C/p\u003E\n\u003Cp\u003EA voltage swell can generally happen when a heavy load turns off in a power system. Poorly regulated transformers are also known to cause swells, mainly during off-peak hours.\u003C/p\u003E\n\u003Cp\u003EAlthough not as common as sags, voltage swells do have a serious impact. While the effects of a sag are more noticeable, the effects of a voltage swell are often more destructive. Swells tend to affect sensitive equipment, especially in instances when voltage values are excessively high. Swells also cause data loss and flickering of screens and lighting.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E3. Voltage Spikes\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022spike\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00227e1fc4e1-dffe-4a3b-8498-1652b6b47a66\u0022 height=\u0022292\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-spike.jpg\u0022 width=\u0022437\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EVoltage spikes describe very fast variations of the voltage value for durations from several microseconds to even a few milliseconds. These variations may reach thousands of volts, even in low voltage. Spikes may be caused by a disconnection of heavy loads or lightning. Spikes are known to destroy electronic components, insulation materials and also cause data processing errors.\u00A0\u003C/p\u003E\n\u003Cp\u003EOn another note, spikes should not be confused with transients, which are destructively high magnitudes of current and voltage, or even both. Transients exist in even shorter durations than spikes, from less than 50 nanoseconds to as long as 50 milliseconds. This is the shortest among PQ problems, hence, its name. Transients usually include abnormal frequencies, which could reach as high as 5 MHz.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022Transient\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022cafdf5b9-cbe6-4b73-9784-74c715a12af3\u0022 height=\u0022313\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-transient.jpg\u0022 width=\u0022431\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003ESpikes and transients differ to power surges because they are larger in magnitude yet much shorter in duration. These sudden bursts of energy can result in circuit board or processor damage, memory loss and data corruption.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E4. Voltage Unbalance\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022unbalance\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u002230263c72-2e46-4bfd-a16b-4aa9979d1fca\u0022 height=\u0022291\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-unbalance.jpg\u0022 width=\u0022436\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EVoltage unbalance describes the phenomenon that occurs when a voltage variation in a three-phase system in which the phase-angle differences between them are unequal. An example of a cause of voltage unbalance is the incorrect distribution of single-phase loads by the three phases of the system (possibly due to a fault). Voltage unbalance mostly affects three-phase induction machines.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E5. Voltage Interruptions\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThere are two types of voltage interruptions, namely, long and very short.\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/index.html\u0022\u003E\u003Cimg alt=\u0022long\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00222ac36c3d-3366-4830-b933-f69ee6d21f62\u0022 height=\u0022286\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-interruptions%20long.jpg\u0022 width=\u0022428\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022short\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u002238e07ee9-15b6-47a5-a6da-3fe0cc5b98f0\u0022 height=\u0022291\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Voltage-interruptions%20short.jpg\u0022 width=\u0022436\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EVery short interruptions are described as a total interruption of electrical supply for a duration ranging from a few milliseconds, to one or two seconds. One of the causes of very short interruptions include the opening and automatic closing of protection devices to decommission a faulty section of the network. Very short voltage interruptions result in the malfunction of data processing equipment, tripping of protection devices, and the loss of information.\u003C/p\u003E\n\u003Cp\u003ELong voltage interruptions refer to the total interruption of electrical supply for a duration greater than one to two seconds. Long interruptions may be caused by storms, human error or failure of protection devices.\u003C/p\u003E\n\u003Cp\u003ELong voltage interruptions result in the stoppage of all equipment.\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ETrust us for reliable Power Quality solutions\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003ENot sure what to do about your power quality issues? Then give us a call! We will recommend the best products and solutions to assist you in maintaining optimal power quality at your facility!\u003C/p\u003E\n\u003Cp\u003EClick \u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to chat to one of our experts now!\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EFollow our PQ Series\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EIn the next article, we will be delving into Harmonics. Be sure to follow the series to catch all the articles! Click \u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to subscribe now!\u003C/p\u003E\n", "created": "Sep 2020", "terms": "Electrical, Education" }, { "title": "LEARN | An introduction to Power Quality part 1", "nid": "422", "body": "\u003Cp class=\u0022text-align-justify\u0022\u003EWhat is power quality, and how important is it? Good power quality saves money and time, ensures a safer workplace, prolonged equipment life and increased efficiency. On the other hand, poor power quality often leads to reduced energy efficiency, and various other downsides.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe topic of Power Quality has become increasingly prevalent. Power Quality is also such a vast topic that can be discussed at length.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EIn this\u00A0series, we\u2019re scratching the surface of Power Quality (PQ) to give you a basic understanding on the aspects that contribute to poor PQ, and what you can do about them:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EUnderstanding Power Quality\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EUnderstanding Power Quality issues and what to do about them:\u003Cbr /\u003E\n\ta) \u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-2---Voltage-Instability\u0022\u003E\u003Cstrong\u003EVoltage instability\u003C/strong\u003E\u003C/a\u003E\u003Cbr /\u003E\n\tb) \u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-3---Harmonics\u0022\u003E\u003Cstrong\u003EHarmonics\u003C/strong\u003E\u003C/a\u003E\u003Cbr /\u003E\n\tc) \u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Introduction-to-Power-Quality-part-4---Power-Factor\u0022\u003E\u003Cstrong\u003EPoor power factor\u003C/strong\u003E\u003C/a\u003E\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EWe\u2019re kicking off the series by discussing the basics of Power Quality. Click on the links above to catch the full series.\u00A0\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EUnderstanding Power Quality\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u2018Power Quality\u2019 is a big buzz word in the industry. By definition, power quality relates to the ability of electrical equipment to consume energy being supplied to it. In order for electrical systems to function in their intended manner, and without significant loss of performance or life, they require a supply of electricity that is of good quality.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003ECharacteristics of Clean Power\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u2018Clean power\u2019 is the term used to define power that is of a good quality. In order to understand what makes electrical power \u2018clean\u2019, we must first understand traits associated with it. Good quality electrical power has several characteristics:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ENo harmonic content\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ENo interruptions\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ELow variation in voltage magnitude (dips and spikes)\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ELow transient voltages and currents\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EConsequences of Dirty Power \u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EElectricity that is considered to be of poor quality is termed \u2018dirty power\u2019. Poor power quality has a number of consequences, including:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EHigher energy usage and costs\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EEquipment instability and failure\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EHigher maintenance costs\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp\u003E\u003Cfigure role=\u0022group\u0022 class=\u0022caption caption-img align-center\u0022\u003E\n\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cimg alt=\u0022Factors that impact power quality\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022eb1cfd1d-a873-4088-b98f-e56c7aa0ffd2\u0022 height=\u0022492\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/factors%20that%20impact-02.jpg\u0022 width=\u0022745\u0022 /\u003E\u003C/a\u003E\n\u003Cfigcaption\u003EIllustration depicting the factors that have an impact on Power Quality\u003C/figcaption\u003E\n\u003C/figure\u003E\n\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EThe basics of power quality issues \u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EFrom the illustration above, you can see that there are a number of factors that impact on power quality. The most common issues that we repeatedly see in South African industries include:\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E1. Voltage instability\u003C/strong\u003E\u003Cbr /\u003E\nThis is in part a side effect of the high or low voltage electricity supply from the network. High voltage does not increase equipment power and is detrimental to equipment performance and longevity, and low voltage can cause reduced productivity. Voltage optimisation ensures the voltage supplied to the system is stable, as required by the equipment on site.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E2. Harmonic voltages and currents\u003C/strong\u003E\u003Cbr /\u003E\nThese are introduced by a range of common electrical devices which distorts the AC wave form and increases power usage. By introducing harmonic filters or reactors, the result is more efficient power usage and cost savings.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E3. Poor power factor\u003C/strong\u003E\u003Cbr /\u003E\nThis refers to an excess of reactive power in the system. This reactive power does not perform any real work. As such, it is wasteful and costly. Power Factor Correction (PFC) reduces and can almost eliminate this reactive power, reduce energy costs and stop equipment overheating, nuisance tripping and motor failure.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003ELearn more\u003C/strong\u003E\u003Cbr /\u003E\nClick \u003Ca href=\u0022https://www.youtube.com/watch?v=q4VjsHq4LOk\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to watch this informative video from Schneider, on the various power quality issues!\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003Ea-eberle\u0027s PQ-Box 150\u003C/strong\u003E\u003Cbr /\u003E\nPower quality takes a huge leap forward with\u00A0a-eberle\u2019s\u00A0PQ-Box 150 power grid analyser. The PQ-Box measures voltage quality according to stringent requirements for low, medium and high voltage networks. Furthermore, the device is equipped with a number of triggering options which enables them to quickly identify faults in the power grid.\u003Cbr /\u003E\nFor more information, \u003Ca href=\u0022https://www.youtube.com/watch?v=SwNAkAB-6YQ\u0022\u003E\u003Cstrong\u003Ewatch\u003C/strong\u003E\u003C/a\u003E a video on this incredible device.\u00A0\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EEaton\u0027s Essential Line Interactive UPS\u003C/strong\u003E\u003Cbr /\u003E\nDid you know that we are an Eaton Premium Distributor? We stock a comprehensive range of Eaton products and solutions at competitive prices.\u003Cbr /\u003E\nTurn to Eaton\u2019s Essential Line Interactive UPS for unparalleled protection against power outages and poor power quality!\u003Cbr /\u003E\nFor more information, \u003Ca href=\u0022https://www.youtube.com/watch?v=3ZQh8ataMvk\u0022\u003E\u003Cstrong\u003Ewatch\u003C/strong\u003E\u003C/a\u003E our quick video!\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ENeed a Power Quality solution for your facility, click \u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to chat to one of our electrical experts now!\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n", "created": "Sep 2020", "terms": "Electrical, Education" }, { "title": "PRODUCT NEWS | Schneider\u0026#039;s Illuminated E-Stop", "nid": "514", "body": "\u003Cp\u003E\u003Cimg alt=\u0022Schneider e stop\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00220fa03c3d-e403-4361-8ab1-c6fd5b03ff35\u0022 height=\u0022384\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Picture1_2.png\u0022 width=\u0022438\u0022 class=\u0022align-center\u0022 /\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003ESchneider\u2019s Illuminated Emergency Stop\u003C/b\u003E\u003C/p\u003E\n\u003Cp\u003EOur extensive range of Schneider Electric products and solutions includes the Harmony XB5 range of illuminated Emergency Stops.\u003C/p\u003E\n\u003Cp\u003EEmergency stops are an integral part of all machinery installations.\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003ESchneider innovated the Illuminated E-Stop with two customer pain points in mind: \u003C/b\u003E\u003C/p\u003E\n\u003Cp\u003E1. Difficulty in locating an emergency stop in a dark or crowded environment\u003Cbr /\u003E\n2. Difficulty in locating the activated emergency stop in long machines\u003C/p\u003E\n\u003Cp\u003ELocating an emergency stop quickly is crucial, as a second too late could result not only in production loss, but also the potential loss of a limb or a life.\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003EWhat differentiates Schneider\u2019s Illuminated E-stop from its previous version? \u003C/b\u003E\u003C/p\u003E\n\u003Cp\u003ESchneider has added a ring light to the e-stop button. Once activated, the light turns red and it will remain red until the operator or technician has disengaged it.\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003EThere are three versions of the Illuminated Ring:\u003C/b\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003EOption 1 - Existing range of push buttons\u003C/b\u003E\u003Cbr /\u003E\nThe addition of an illuminated legend ring to existing installations. A normally open contact is required to activate the red LED light.\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003EOption 2 - Panel Mount\u003C/b\u003E\u003Cbr /\u003E\nCan be mounted directly onto a panel. New aesthetics.\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003EOption 3 \u2013 Control Station\u003C/b\u003E\u003Cbr /\u003E\nPre-assembled in an enclosure.\u003C/p\u003E\n\u003Cp\u003E\u003Cb\u003EResources\u003C/b\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cfont color=\u0022#0563c1\u0022\u003E\u003Cu\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/download/magnet-harmony-xb5-zb5as84w2g.pdf\u0022\u003E\u003Cb\u003EDOWNLOAD\u003C/b\u003E\u003C/a\u003E\u003C/u\u003E\u003C/font\u003E the e-stop product datasheet\u003C/p\u003E\n\u003Cp\u003E\u003Cfont color=\u0022#0563c1\u0022\u003E\u003Cu\u003E\u003Ca href=\u0022https://www.youtube.com/watch?v=4lUJoAI2i4Q\u0022\u003E\u003Cb\u003EWATCH\u003C/b\u003E\u003C/a\u003E\u003C/u\u003E\u003C/font\u003E a quick video to learn how to mount the e-stop\u003C/p\u003E\n\u003Cp\u003E\u003Cfont color=\u0022#0563c1\u0022\u003E\u003Cu\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cb\u003ECHAT\u003C/b\u003E\u003C/a\u003E\u003C/u\u003E\u003C/font\u003E to us for a Schneider solution for your facility!\u003C/p\u003E\n\u003Cp\u003EWe are the largest distributor of Schneider Electric products in South Africa and boast in-depth Schneider product knowledge and technical expertise.\u003C/p\u003E\n", "created": "Jul 2021", "terms": "Electrical, Products, Schneider" }, { "title": "We put Schneider Electric\u0026#039;s Altivar Easy 610 VSD to the test!", "nid": "411", "body": "\u003Cp\u003EMake the most of your energy with Schneider Electric\u0027s Altivar Easy 610 Variable Speed Drive...\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.youtube.com/watch?v=Qwsftz7KzyI\u0026amp;t=4s\u0022\u003E\u003Cstrong\u003EWatch\u003C/strong\u003E\u003C/a\u003E our quick video demonstrating energy savings that can be achieved using this incredible VSD!\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.youtube.com/watch?v=Qwsftz7KzyI\u0026amp;t=4s\u0022\u003E\u003Cimg alt=\u0022ATV610 VSD\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u002230a4f259-a043-43ad-a1da-4a098c06bd3d\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/ATV%20610%20VSD.jpg\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EClick \u003Ca href=\u0022mailto:hello@magnetgroup.co.za\u0022\u003E\u003Cstrong\u003Ehere\u003C/strong\u003E\u003C/a\u003E to chat to one of our electrical experts now!\u003C/p\u003E\n", "created": "Aug 2020", "terms": "Electrical, General" } ]