Electric Motor
Sizing The DOL Motor Starter Parts (Contactor, Fuse, Circuit Breaker and Thermal Overload Relay)
In this technical article we’ll calculate the size of each part of DOL motor starter for the system voltage 415V, 5HP three phase household application induction motor, code A, motor efficiency 80%, motor RPM 750, power factor 0.8 and overload… Read more
Sep 11, 2013 | By Jignesh Parmar
Energy and Power
Lightning And Surge Protection For Cable Networks And Antennas For TV (Part 1)
IEC 60728-11 complies with the state of the art and offers easy, standardized and effective protective mechanisms against the effects of lightning strikes into antennas. Antennas installed according to this standard do not increase the probability of lightnings to strike… Read more
Sep 09, 2013 | By Edvard Csanyi
Cables
Selection Of Number Of Cable Cores With Emphasis On Sizing Parameters
The selection of number of cable cores basically depends on the type of system where it is going to be installed. Generally we have two types of systems: A perfectly balanced system and A system with some degree of unbalance… Read more
Sep 06, 2013 | By Chirag Singhal
Energy and Power
Determining the soil resistivity to design a good substation grounding system
It is essential to determine the soil resistivity and maximum grid currents to design a substation grounding system. The touch and step voltages are directly proportional to these values. Overly conservative values of soil resistivity and grid current will increase… Read more
Sep 04, 2013 | By Edvard Csanyi
Electrical Lectures
Electrical Thumb Rules You MUST Follow (3)
Continued from second part: Electrical Thumb Rules You MUST Follow (Part 2) For Motor Size of Capacitor = 1/3 Hp of Motor ( 0.12x KW of Motor) For Transformer < 315 KVA 5% of KVA Rating 315 KVA to 1000… Read more
Sep 02, 2013 | By Jignesh Parmar
Industrial Automation
Goals and Benefits of the IEC 61131 Standard (PLCs – Programmable Logic Controllers)
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… Read more
Aug 30, 2013 | By Edvard Csanyi
Electrical Lectures
Electrical Thumb Rules You MUST Follow (2)
Continued from first part: Electrical Thumb Rules You MUST Follow (Part 1) 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)… Read more
Aug 28, 2013 | By Jignesh Parmar
Testing and Commissioning
Identifying The Primary And Secondary Phasor Polarities Of Transformer – Polarity Test
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… Read more
Aug 26, 2013 | By Edvard Csanyi
Energy and Power
Hey Tesla, get married, be happy and sleep o’nights! – AMERICAN ELECTRICIAN, July 1, 1896
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… Read more
Aug 24, 2013 | By Edvard Csanyi
Electrical Lectures
Electrical Thumb Rules You MUST Follow (1)
This technical article deals with the electrical thumb rules related to cable capacity, current capacity of equipment, earthing resistance, minimum bending radius of a cable, insulation resistance, transformer and lightning arrestor parameters, diesel generator, and current transformer (CT). Cable Capacity… Read more
Aug 23, 2013 | By Jignesh Parmar
Electric Motor
Drive Design in Electric Vehicles
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… Read more
Aug 21, 2013 | By Vishy
Power Substation
Total Losses in Power Distribution and Transmission Lines
This technical article discusses two types of transmission and distribution losses, technical losses and non-technical losses (or commercial losses). Power generated in power stations pass through large and complex networks like transformers, overhead lines, cables and other equipment and reaches… Read more
Aug 19, 2013 | By Jignesh Parmar
Energy and Power
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… Read more
Aug 17, 2013 | By Edvard Csanyi
Energy and Power
National Fire Alarm Code Defined By NFPA 72
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…. Read more
Aug 16, 2013 | By Edvard Csanyi
IEC Standards
An Overview of IEC 60076-10 – Determination Of Sound Levels Of Power Transformers
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… Read more
Aug 14, 2013 | By Edvard Csanyi
