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[ { "title": "PRODUCT NEWS | Easy Overcurrent Protection with Schneider\u2019s Easergy P3", "nid": "547", "body": "\u003Cp class=\u0022text-align-justify\u0022\u003ECovering all applications in medium-voltage and high-voltage protection, from overcurrent or motor to complex distance protection, \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/index.php\u0022\u003ESchneider Electric\u2019s\u003C/a\u003E\u003C/strong\u003E protective relays give you the safety and reliability needed to operate with confidence.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EOvercurrent Protection made Easy\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EOvercurrent protection relays can be used for primary electrical protection, a backup for phase overcurrent or earth fault protection. Instantaneous definite time, IDMT, directional or non-directional are types of overcurrent characteristics often used in electrical protection from basic to advanced feeder applications. Available in a range from basic devices, to complex numerical devices with IEC 61850 communication and cybersecurity.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EEasergy P3\u003Cbr /\u003E\nCompact protection relays for standard applications\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.se.com/za/en/product-range/64884-easergy-p3/?parent-subcategory-id=86796\u0026amp;filter=business-6-medium-voltage-distribution-and-grid-automation#overview\u0022\u003E\u003Cimg alt=\u0022Easergy P3\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00220dc793c2-7fc4-41ba-9454-bad016fe30fd\u0022 height=\u0022294\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Schneider%20Easergy%20P3.png\u0022 width=\u0022262\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EEasergy P3 is Schneider\u2019s latest protection relay for all common MV applications. It is designed for unparalleled efficiency, greater connectivity and enhanced safety to allow Panel Builders and Contractors to save time every day, whilst helping to ensure that critical assets and personnel remain protected.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EEasergy Benefits\u003Cbr /\u003E\nUnparalleled efficiency with attention to time saving at every step\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ESimple selection with web-configurator tool\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ESimplified configuration and testing from the new eSetup Easergy Pro setting tool\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EQuick setting changes in the field with the embedded web-server\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EBetter connectivity brings great benefits\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ESimplify operation and maintenance with the innovative Easergy SmartApp mobile application\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003E9 communication protocols in one device with Serial and Ethernet connectivity\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EIEC 61850 and redundancy protocols (RSTP, PRP)\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EIncreased amount of inputs \u0026amp; outputs for more possibilities\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EEnhanced safety for your assets and personnel\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EEmbedded arc protection to reduce risk and long term equipment damage \u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u003C/li\u003E\n\u003Cli\u003EBuilt-in virtual injection testing to quicken installation and commissioning using eSetup Easergy Pro\u003C/li\u003E\n\u003Cli\u003ECompliant to international quality standards (i.e. IEC 60255-1)\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ESuitable for buildings, industries and electric utilities applications alike, Easergy P3 offers a complete range of protection for medium voltage.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ETo learn more about the Easergy range, \u003Ca href=\u0022https://download.schneider-electric.com/files?p_enDocType=Catalog\u0026amp;p_File_Name=P3_NRJCAT17764EN_v19_052021.pdf\u0026amp;p_Doc_Ref=NRJCAT17764EN\u0022\u003E\u003Cstrong\u003EDOWNLOAD\u003C/strong\u003E\u003C/a\u003E the product catalogue and \u003Ca href=\u0022https://www.youtube.com/watch?v=TdNDKWM4Q5M\u0022\u003E\u003Cstrong\u003EWATCH\u003C/strong\u003E\u003C/a\u003E a quick product highlights video.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EWe are the largest Schneider Electric distributor in South Africa. \u003Cstrong\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Schneider%20Enquiry\u0022\u003ECHAT\u003C/a\u003E\u003C/strong\u003E to our experts for more on the Schneider range of products and solutions!\u003C/p\u003E\n", "created": "Sep 2021", "terms": "Electrical, Products, Schneider" }, { "title": "PRODUCT NEWS | Brady\u2019s solution to identify cables outdoors for a decade", "nid": "548", "body": "\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Brady Enquiry\u0022\u003E\u003Cimg alt=\u0022Brady oudoor identification solutions\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00228dbc3931-b9d3-48e7-8081-47ce77278a61\u0022 height=\u0022190\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Brady%20solar%20panels%20identification%202.JPG\u0022 width=\u0022204\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EThe challenge\u2026\u003Cbr /\u003E\nTo quickly and reliably identify large volumes of various outdoor cable types\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EExposure to the elements can pose a challenge, particularly when it comes to an identification solution. How can you ensure that tags remain attached to your equipment, and legible for 10 years under active UV-radiation and other environmental conditions\u2026?\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EThe solution\u2026\u003Cbr /\u003E\nReliable, colour-coded tags printed on site\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EBrady has a comprehensive range of solutions to beat this challenge:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EB-7598 polyester cable tags\u003Cbr /\u003E\n\tDurable outdoor cable identification\u003C/strong\u003E\u003Cbr /\u003E\n\tThe B-7598 polyester cable identification tag has been developed to keep cables identified in outdoor environments. It offers great abrasion resistance and up to 10 year\u2019s outdoor legibility and durability. These tags are available in 7 colours.\u003Cbr /\u003E\n\t\u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/download/magnet-brady-b-7598-datasheet.pdf\u0022\u003EDOWNLOAD\u003C/a\u003E \u003C/strong\u003Ethe product brochure to learn more.\u003Cbr /\u003E\n\t\u00A0\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EB-7593 polyester nameplate labels\u003Cbr /\u003E\n\tFlexible, self-adhesive cable identification\u003C/strong\u003E\u003Cbr /\u003E\n\tThe B-7593 is a polyester label equipped with a foam that looks just like an engraved metal nameplate, but with increased flexibility at a fraction of the cost. After printing, the self-adhesive label quickly expands to take on the shape of a metal nameplate. \u00A0\u003Cbr /\u003E\n\t\u00A0\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EBradyPrinter i3300\u003Cbr /\u003E\n\tVersatile Industrial Label Printer\u003C/strong\u003E\u003Cbr /\u003E\n\tThe compact, BradyPrinter i3300 can print a wide variety of labels, sleeves, tags and signs for cable, product and facility identification. Printable materials can be switched and be ready to print in less than 20 seconds, thanks to smart label rolls an printer auto-calibration.\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EThe results\u2026\u003Cbr /\u003E\nReliably identified outdoor cables\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/download/magnet-brady-case-study-vindo-solar.pdf\u0022\u003EREAD\u003C/a\u003E the case study of a Brady client who used this product combination and achieved a reliable identification solution for their solar plant.\u003Cbr /\u003E\n\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Brady%20Enquiry\u0022\u003ECHAT\u003C/a\u003E \u003C/strong\u003Eto us for a Brady solution for your facility now!\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Brady Enquiry\u0022\u003E\u003Cimg alt=\u0022Brady solution\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022952b8fbc-0837-45ad-afcf-7aa72ee2988e\u0022 height=\u0022254\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Picture1_4.png\u0022 width=\u0022703\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n", "created": "Sep 2021", "terms": "Electrical, Products, Brady" }, { "title": "READ | Innovation in Solar Technology Pt 5", "nid": "549", "body": "\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-solar/index.php\u0022\u003E\u003Cstrong\u003ESolar technology\u003C/strong\u003E\u003C/a\u003E is constantly evolving. Pioneers in the industry have contributed a great deal in innovation, advancing what we think we know about solar technology, into so much more! In this article, we introduce you to Hairy Solar Panels\u2026 Missed out on previous articles in the series? Catch up now\u2026\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news.php?type=articles\u0026amp;name=READ--Innovation-in-Solar-Technology-Pt-1\u0022\u003E\u003Cstrong\u003EPart 1 \u2013 Solar Glass\u003C/strong\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Ca href=\u0022https://www.demo.ecatonline.co.za/websites/magnetgroup/news.php?type=articles\u0026amp;name=READ--Innovation-in-Solar-Technology-Pt-2\u0022\u003E\u003Cstrong\u003EPart 2 \u2013 Thin Film Solar Panels\u003C/strong\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news.php?type=articles\u0026amp;name=READ--Innovation-in-Solar-Technology-Pt-3\u0022\u003E\u003Cstrong\u003EPart 3 \u2013 Perovskite Solar Panels\u003C/strong\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news.php?type=articles\u0026amp;name=READ--Innovation-in-Solar-Technology-Pt-4\u0022\u003E\u003Cstrong\u003EPart 4 \u2013 Coloured Solar Panels\u003C/strong\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EPart 5 \u2013 Hairy Solar Panels\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Solar Enquiry\u0022\u003E\u003Cimg alt=\u0022hairy solar panels\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00225040241e-c5e8-4869-ba87-5359b4edfe6b\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/hairy%20panels%20newsletter%20FINAL.jpg\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EWhat are hairy solar panels?\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EUsing arrays of long, thin silicon wires embedded in a polymer substrate, a team of scientists from the California Institute of Technology (Caltech) created a new type of flexible solar cell that enhances the absorption of sunlight and efficiently converts its photons into electrons. The solar cell does all this using only a fraction of the expensive semiconductor materials required by conventional solar cells.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EHow are these panels produced?\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EHairy solar panels are produced with the help of nanotechnology by using light absorbing nanowires on carbon-nanotube fabrics. These nanowires have a cylindrical structure with a diameter of about a 10000\u003Csup\u003Eth\u003C/sup\u003E\u00A0of a human hair.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EThe anatomy of hairy solar panels\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EEach wire or \u2018hair\u2019 on a panel measures between 30 and 100 microns in length and only 1 micron in diameter. In terms of area or volume, just 2% of it is silicon, and 98% is polymer.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EWhile these arrays have the thickness of a conventional crystalline solar cell, their volume is equivalent to that of a two-micron-thick film. Or to put it in another way, there is a lot of empty space in there.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ESince the silicon material is an expensive component of a conventional solar cell, a cell that requires just one-fiftieth of the amount of this semiconductor will be much cheaper to produce.\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?subject=Solar Enquiry\u0022\u003E\u003Cimg alt=\u0022diagram 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022bd038c5e-1270-4445-95c5-75d3f7d3d647\u0022 height=\u0022268\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/solarwires-caltech-photo01.jpg\u0022 width=\u0022333\u0022 /\u003E\u003C/a\u003E\n\u003Cfigcaption\u003EPhotomicrograph of a silicon wire array embedded within a transparent, flexible polymer film.\u003C/figcaption\u003E\n\u003C/figure\u003E\n\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EHow efficient are hairy solar panels?\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe light-trapping limit of a material refers to how much sunlight it is able to absorb. The silicon-wire arrays absorb up to 96 percent of incident sunlight at a single wavelength and 85 percent of total collectible sunlight. What\u2019s most important in a solar cell is whether that absorption leads to the creation of charge carriers.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe silicon wire arrays are able to convert between 90 and 100 percent of the photons they absorb into electrons. High absorption plus good conversion makes for a high-quality solar cell.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe key to the success of these solar cells is their silicon wires, each of which is independently a high-efficiency, high-quality solar cell. When brought together in an array, however, they\u2019re even more effective, because they interact to increase the cell\u2019s ability to absorb light.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ELight comes into each wire, and a portion is absorbed and another portion scatters. The collective scattering interactions between the wires make the array very absorbing.\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?subject=Solar Enquiry\u0022\u003E\u003Cimg alt=\u0022Diagram 4\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022c5ef223d-518a-4c8e-a49d-c4ba48528ba5\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Diagram.jpg\u0022 /\u003E\u003C/a\u003E\n\u003Cfigcaption\u003EThis is a schematic diagram of the light-trapping elements used to optimize absorption within a polymer-embedded silicon wire array.\u003C/figcaption\u003E\n\u003C/figure\u003E\n\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ESpend less green to go green\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe composite nature of these hairy solar cells means that they are also flexible. Having these be complete flexible sheets of material is important as flexible thin films can be manufactured in a roll-to-roll process, an inherently lower-cost process than one that involves brittle wafers, like those used to make conventional solar cells.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EWhy hairy solar panels? \u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EVisually striking, highly efficient at carrier collection and highly absorbing.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003ESolar technology is indeed taking leaps and bounds.\u003C/p\u003E\n\u003Cp\u003EConsider solar for your business or facility. \u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Solar Enquiry\u0022\u003E\u003Cstrong\u003ECHAT\u003C/strong\u003E \u003C/a\u003Eto our experts now!\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ESource:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://blog.thesietch.org/2010/02/23/hairy-solar-cells-cheap-efficient-potentially-revolutionary/\u0022\u003Ehttps://blog.thesietch.org/2010/02/23/hairy-solar-cells-cheap-efficient-potentially-revolutionary/\u003C/a\u003E\u003C/p\u003E\n", "created": "Sep 2021", "terms": "Solar, Education" }, { "title": "LEARN | Understanding 3-Phase Transformers pt 3", "nid": "544", "body": "\u003Cp class=\u0022text-align-justify\u0022\u003EWe\u2019re unpacking transformers in our NEW series. An important discussion point is the protection of transformers. In this article, we give an overview of protection schemes specifically for oil-type transformers. Catch-up on previous articles in the series:\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news.php?type=articles\u0026amp;name=LEARN--Understanding-3-Phase-Transformers-pt-1\u0022\u003E\u003Cstrong\u003EPart 1: Understanding Transformers and how they work\u003C/strong\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Understanding-3-Phase-Transformers-pt-2\u0022\u003EPart 2: Advantages, disadvantages and types of 3-Phase Transformers\u003C/a\u003E\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EPart 3: Protection Schemes for Oil Type Transformers\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Electrical Enquiry\u0022\u003E\u003Cimg alt=\u0022Transformer image 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022731c793c-8cf8-498f-ba8e-57c9c8fc803c\u0022 height=\u0022247\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Newsletter%20transformers.jpg\u0022 width=\u0022536\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EUnderstanding Transformer Protection\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ETransformer protection is vital in ensuring continuity of your electrical supply, safety as well as preventing damage to the electrical infrastructure in a system or network. Transformer protection schemes are installed in transformers to measure currents, detect faults and issue trip signals to circuit breakers to isolate a fault in an unprotected zone.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EStresses on a Transformer that are generated by a Supply\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EA transformer can be stressed by two types of over voltages that may damage or even destroy the transformer. These are:\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EA lightning over voltage that may occur by a lightning strike falling on or near an overhead line that supplies the installation where the transformer is installed\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EA switching over voltage that is generated from the opening of a circuit breaker or a load break switch\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EIt is important that over-voltage protection is considered for:\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EThe bushings and insulation on the medium voltage side\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EThe neutral of the transformer (Star point)\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EThe bushing and lines on the low voltage side\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EProtection must be provided against these two types of over voltages, and must be done with the use of Metal Oxide (MO) surge arrestors that are installed on both primary and secondary sides of the transformer. The surge arresters are required to be installed as close as possible to the bushings. An example of the positioning of surge arrestors for a star connected medium voltage transformer can be seen in the figure below.\u003C/p\u003E\n\u003Cp\u003E\u003Cfigure role=\u0022group\u0022 class=\u0022caption caption-img align-center\u0022\u003E\n\u003Cimg alt=\u0022surge arrestors\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022f56eeb2b-6193-4a25-9ad9-9fe25343b0fd\u0022 height=\u0022136\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Figure%201.png\u0022 width=\u0022671\u0022 /\u003E\n\u003Cfigcaption\u003EPositioning of Surge Arrestors on a Medium Voltage Transformer\u003C/figcaption\u003E\n\u003C/figure\u003E\n\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EStresses on a Transformer that Result from Overload\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EAn increase in the power demand from an installation will cause the transformer supplying it to experience an overload. This increase in demand can either be a result of the progressive increase in load or the addition of new loads to the installation itself. An overload will result in the temperature of the oil and windings increasing in the transformer, with a subsequent reduction in the transformer lifespan.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThermal overload relays are implemented to protect transformers against overload faults. These relays provide protection by simulating the temperature of the transformer winding. The simulation is based on the current measurement and the thermal time constant of the transformer. This relay can also determine the remaining time before the emission of the tripping order and the time delay before re-energizing the transformer. Oil type transformers are also installed with thermostats that control the temperature of the oil.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe thermal overload relay, thermostat or heat sensor generally provides two levels of detection which are:\u003C/p\u003E\n\u003Col\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EA low level signal which is used to alert maintenance staff and isolate the faulted zone in the network\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EA high level signal which is used to de-energize the transformer by issuing a signal to the nearest circuit breaker to isolate the faulted zone\u003C/li\u003E\n\u003C/ol\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003ETIP:\u003C/strong\u003E Schneider Electric has the Easergy, Micom and Sepam series of protection relays that can be used in transformer protection schemes. \u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Electrical Enquiry\u0022\u003E\u003Cstrong\u003ECHAT\u003C/strong\u003E\u003C/a\u003E to us for more information.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EOverheating Protection\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EA transformer will overheat when experiencing overloads or short circuit conditions. The allowable overload experienced and the duration of it are both dependent on the transformer type and class of insulation that is used for the transformer.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ETransformers can carry higher loads for a short period of time and if it operates for a very long period, damage to the insulation can occur as the temperature rises above an assumed maximum temperature. An oil-cooled transformer is said to be at maximum when the temperature is equal to 95\u00B0C. If the operating temperature of the transformer is greater than the specified insulated rating, this will then decrease the life expectancy of the transformer and cause breakdown to the insulation over a period of time.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003ETemperature control\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ELarge transformers have winding temperature detection devices that are used to measure and monitor temperature parameters in the windings or winding temperature. The two methods of measurement are hot spot measurement and the second is referred to as the top-oil measurement. A temperature control box can be seen below which consists of a thermometer that is used to measure the temperature of a liquid insulated transformer.\u003C/p\u003E\n\u003Cp\u003E\u003Cfigure role=\u0022group\u0022 class=\u0022caption caption-img align-center\u0022\u003E\n\u003Cimg alt=\u0022Temperature control box\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00226a7df3d7-ce9d-4cff-9ae4-7b05fcc18c8b\u0022 height=\u0022285\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Figure%202.png\u0022 width=\u0022312\u0022 /\u003E\n\u003Cfigcaption\u003ETemperature Control Box\u003C/figcaption\u003E\n\u003C/figure\u003E\n\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EAs seen in the figure above, the temperature control box consists of a dial gauge that indicates the temperature of the transformer by using the black needle, whilst the red needle is used to set the alarm point. If the black needle surpasses the red needle, then the device will activate an alarm. The high temperature which develops in the core and windings is referred to as the top oil temperature, and it gives an estimate of the hot spot temperature in the core. Currently, overheating protection is achieved using fibre optic cables that are installed within the low voltage winding to accurately measure the temperature of the transformer.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EWe continue our overview of protection schemes in the second instalment of this article. Watch this space for your complete guide to Understanding Transformers\u2026\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ENeed advice on how best to protect your transformer? \u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Electrical Enquiry\u0022\u003E\u003Cstrong\u003ECHAT\u003C/strong\u003E \u003C/a\u003Eto us now!\u003C/p\u003E\n", "created": "Sep 2021", "terms": "Electrical, Education" }, { "title": "PRODUCT NEWS | In synch with Schneider\u0026#039;s Harmony Range", "nid": "543", "body": "\u003Cp\u003E\u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Schneider Enquiry\u0022\u003E\u003Cimg alt=\u0022Harmony range\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00225eaabc0f-2813-4394-93c1-dde04fc29b4a\u0022 height=\u0022313\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Harmony%20range.JPG\u0022 width=\u0022673\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EWhat if your production line stopped because of a single pushbutton?\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EImagine the operating loss that may induce the failure of the operator control of your equipment, which represents less than 1% of its cost.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EIn industry, there is usually a loss of productivity that can exceed 10%, due to industrial equipment failures. This is a very important source of economy. To reach this deposit, a sum of precautions must be in place and we must think of every eventuality, including the failure of the operator dialogue devices. Installation stopping because of a banal pilot light or pushbutton is infuriating, and a few simple rules can avoid this.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003ETo limit these cases there are not thousands of solutions, but rather three that can be combined: \u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E1. You have to use reliable, high-quality components to minimize the occurrence of failures (failure prevention)\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E2. We can provide preventive maintenance by replacing a priori devices that may fail (preventive maintenance)\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E3. You can set up a highly reactive organization to minimize downtime (reactive maintenance)\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EToday, on average, we know that 30% of maintenance operations are preventive and 70% reactive, but the cursor moves increasingly toward preventive whose profitability is well-proven because the cost of a pushbutton switch is very small compared to the potential operating losses.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003ESchneider\u2019s modular range Harmony\u2122 diameter 22 can play optimally on three levers: \u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E1. The most reliable on the market\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EThe Harmony range is developed and qualified to achieve the highest possible level of reliability. Schneider\u2019s laboratories use the endurance testing standards and robustness to harshest industrial environments. And their electrical endurance tests are done after component aging.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ESchneider is still improving this strength in offering reinforced waterproof solutions (IP66, 67, 69, and 69K), extending the temperature operating range to -40 \u00B0C to 70 \u00B0C. These improvements not only allow Harmony to be installed in harsher environments, but also guarantee a higher lifetime.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003EOther unique features are limiting failure rates:\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ESpecial design that eliminates the re-tightening campaigns for Harmony screw terminals, which are frequently forgotten. This is a good way not to be confronted with a loss of electrical continuity.\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EA complete range of electrical contacts, which covers a very wide range of uses, including standard blocks with high electrical reliability guarantee, power blocks, and gold contacts blocks for low level\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EElectrical contacts hooks with metal locks (including plastic versions)\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003ESnap mounting bases by metal clips (including plastic versions)\u003C/li\u003E\n\u003Cli class=\u0022text-align-justify\u0022\u003EWide range of protective accessories (not only for product heads in front face, but also for the protection of contacts in the electrical cabinet)\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E2. With Harmony, you get the tools to optimize your preventive maintenance\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EEach component\u2019s expected lifetime is specified, expressed in \u201Clambda,\u201D guaranteed number of operations, or mean time to failure. These periods are generally much higher than the lifetimes of equipment or machinery. But if necessary, to avoid any loss of business, it is cost effective to replace the most proven elements. By comparing the actual conditions of use of the products to these specifications customers can implement a preventative maintenance of good quality. Furthermore, the Schneider Electric\u2122 field service team can help you make the diagnosis of the installed base to determine the critical equipment to replace preventively or spare parts collections to store in your factories.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u003Cstrong\u003E3. With Harmony, limit as much as possible the time to repair of your equipment\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ESchneider Electric and Harmony offer you faultless support in reactive maintenance materials. With a strong distribution network 17000 outlets in the world, you can find the products to be replaced available near your plant. A \u201CDistributor Locator\u201D is available to find our closest distributors to your industrial facilities. Because of its modular design and the wide application market coverage (also recently strengthened by the extension of the waterproofness characteristics, operating temperature range, and the addition of new features such as timer, connectors USB or RJ45, flush mounting kits, etc.), the Harmony range ensures you can repair with a reduced number of spare parts (stored by our distributors or in your own maintenance stock).\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EWe back our comprehensive range of Schneider Electric products and solutions with sound technical advice and support.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ENeed a Schneider solution for your facility? \u003Ca href=\u0022mailto:hello@magnetgroup.co.za?subject=Schneider Enquiry\u0022\u003E\u003Cstrong\u003ECHAT\u003C/strong\u003E\u003C/a\u003E to us now!\u003C/p\u003E\n", "created": "Sep 2021", "terms": "Electrical, Products, Schneider" } ]