Monthly Archive for: «August, 2013»

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Goals and Benefits of the IEC 61131 Standard (PLCs – Programmable Logic Controllers)

PLC Hardware/Programming System The five parts of the standard IEC 61131 summarise the requirements of modern PLC systems. These requirements concern the PLC hardware and the programming system. The standard includes both the common concepts already in use in PLC programming and additional new programming methods. The enormous number of details defined means that programming […]

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Electrical Thumb Rules You MUST Follow (Part 2)

Continued from first part: Electrical Thumb Rules You MUST Follow (Part 1) Useful Electrical Equations For Sinusoidal Current: Form Factor = RMS Value/Average Value = 1.11 For Sinusoidal Current: Peak Factor = Max Value/RMS Value = 1.414 Average Value of Sinusoidal Current (Iav) = 0.637 x Im (Im = Max.Value) RMS Value of Sinusoidal Current […]

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Identifying The Primary And Secondary Phasor Polarities Of Transformer – Polarity Test

Polarity Detection This is needed for identifying the primary and secondary phasor polarities. It is a must for poly phase connections. Both a.c. and d.c methods can be used for detecting the polarities of the induced emfs. The transformer is connected to a low voltage a.c. source with the connections made as shown in the […]

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Hey Tesla, get married, be happy and sleep o’nights! – AMERICAN ELECTRICIAN, July 1, 1896

Necessity is the mother of invention This articles appeared at  AMERICAN ELECTRICIAN on July 1, 1896 by journalist Edward J. Wessels. Our sprightly contemporary, the Electrical Journal, takes issue with Mr. Nikola Tesla as to the undesirability of marriage for inventors, and after disproving his statement that few great inventions have been made bv married men, proceeds […]

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Electrical Thumb Rules You MUST Follow (Part 1)

Electrical Thumb Rules For: Cable Capacity Current Capacity of Equipment Earthing Resistance Minimum Bending Radius Insulation Resistance Lighting Arrestor Transformer Diesel Generator Current Transformer Quick Electrical Calculation Cable Capacity For Cu Wire Current Capacity (Up to 30 Sq.mm) = 6X Size of Wire in Sq.mm Ex. For 2.5 Sq.mm = 6×2.5 = 15 Amp, For […]

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Drive Design in Electric Vehicles

Introduction Good Evening all, in this session I’m going to present some of the issues in drive design in the field of Electric Vehicle. I’ve organized the whole series into modules so that each module can be covered with: Drive Design issues Comparison of different drives for EV applications Electrical Machine design – Viewpoints Science […]

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Total Losses in Power Distribution and Transmission Lines (1)

Introduction Power generated in power stations pass through large and complex networks like transformers, overhead lines, cables and other equipment and reaches at the end users. It is fact that the unit of electric energy generated by Power Station does not match with the units distributed to the consumers. Some percentage of the units is […]

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Tesla’s Big Tower To Be Sold For Debt, BROOKLYN DAILY TIMES, June 12, 1907

This article was originally posted in The Brooklyn Daily Times on June 12, 1907. The tower of Wonders at Wardercliffe, where Nikola Tesla, the inventor, preserved SUCH MYSTERY and where it was whispered scientific experiments were to be carried on greater in scope than any ever before attempted, is FOR SALE. The Sheriff of  Sufolk County […]

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National Fire Alarm Code Defined By NFPA 72

Smoke And Fire Alarms NFPA 72 is the National Fire Alarm Code. The importance of installing smoke and fire alarms in homes is supported by results from exhaustive investigations of home fires indicating that measurable quantities of smoke come before detectable quantities of heat. In other words, smoke generally comes before fire. Because this is […]

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An Overview of IEC 60076-10 – Determination Of Sound Levels Of Power Transformers

Sources of sound The audible sound radiated by transformers is generated by a combination of magnetostrictive deformation of the core and electromagnetic forces in the windings, tank walls and magnetic shields. Historically, the sound generated by the magnetic field inducing longitudinal vibrations in the core laminations has been dominant. The amplitude of these vibrations depends on […]

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