High Voltage
Five special transformers for industrial applications you should know about
A number of industry applications require specific industrial transformers due to the usage of power (current) as a major resource for production. Electric arc furnaces (EAF), ladle furnaces (LF) and high-current rectifiers need a specific design to supply the necessary… Read more
Sep 23, 2013 | By Edvard Csanyi
Electric Motor
Testing and commissioning procedure for electric motors
It should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. Motor vibration shall be measured in a tri-axial direction, i.e.: Point x axis – side of… Read more
Sep 20, 2013 | By Edvard Csanyi
Energy and Power
An Overview Of Control (Ice Cube) Relays
An electromechanical relay is an electrical switch actuated by an electromagnet coil. As switching devices, they exhibit simple “on” and “off” behavior with no intermediate states. The electronic schematic symbol for a simple single-pole, single-throw (SPST) relay is shown here:… Read more
Sep 18, 2013 | By Edvard Csanyi
Energy and Power
Comparison Of Neutral Earthing Methods
Neutral earthing systems are very similar to circuit breakers in that they do nothing until something in the system goes wrong! There are several methods for system earthing which can be generally divided into three main categories: Insulated earthing, Solid… Read more
Sep 16, 2013 | By Edvard Csanyi
Energy and Power
Lightning And Surge Protection For Cable Networks And Antennas For TV (Part 2)
Continued from part one: Lightning And Surge Protection For Cable Networks And Antennas For TV (Part 1) If an antenna is protected by isolated air-termination systems it means: – That in the area of flat roofs an air-termination rod will be… Read more
Sep 13, 2013 | By Edvard Csanyi
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
