Industrial Automation
Using MODBUS for Process Control and Automation (2)
To communicate with a slave device, the master sends a message containing: Device Address Function Code Data Error Check Continued from first part of article Using MODBUS for Process Control… Read more
May 31, 2012 | By Edvard Csanyi
Smart Grid
Electric Vehicles and the Smart Grid
Another source of urgency for the smart grid is meeting goals for getting more “clean” cars and vehicles on the road. Electric vehicles largely eliminate greenhouse gas emissions from vehicle… Read more
May 30, 2012 | By Edvard Csanyi
Energy Efficiency
Electric Power Quality and Lighting (part 2)
Continued from first part: Electric Power Quality and Lighting (part 1) Power factor is a measure of how effectively a device converts input current and voltage into useful electric power…. Read more
May 29, 2012 | By Sufi Shah Hamid Jalali
Energy Efficiency
Electric Power Quality and Lighting (part 1)
Concerns about the effects of lighting products on power distribution systems have focused attention on power quality. Poor power quality can waste energy and the capacity of an electrical system;… Read more
May 26, 2012 | By Sufi Shah Hamid Jalali
Energy and Power
Process Design Basics for Station Facility
The purpose of this article is to establish the design basis electrical system Front End Engineering Design (FEED) and data design or standards uses in the gathering stations facility will… Read more
May 25, 2012 | By ivan.kurniawan
Power Substation
Transformer Connection Star-Star
The windings of three phase transformers may be connected in by Y or Δ in the same manner as for three single phase transformer. Since the secondary’s may be connected either… Read more
May 23, 2012 | By jiguparmar
Industrial Automation
Using MODBUS for Process Control and Automation (1)
MODBUS is the most popular industrial protocol being used today, for good reasons. It is simple, inexpensive, universal and easy to use. Even though MODBUS has been around since the… Read more
May 21, 2012 | By Edvard Csanyi
Energy and Power
Special considerations when selecting transformer protection
Current transformer ratio selection and performance require special attention when applying transformer protection. Unique factors associated with transformers, including its winding ratios, magnetizing inrush current, and the presence of winding… Read more
May 19, 2012 | By Edvard Csanyi
Cables
Sizing of power cables for circuit breaker controlled feeders (part 3)
Continued from article Sizing of power cables for circuit breaker controlled feeders (part 2) This criterion is applied so that the cross sectional area of the cable is sufficient to… Read more
May 17, 2012 | By Asif Eqbal
Electrical Lectures
Power Measurement In AC Circuits
Power measurement in AC circuits can be quite a bit more complex than with DC circuits for the simple reason that phase shift complicates the matter beyond multiplying voltage by current… Read more
May 15, 2012 | By Edvard Csanyi
Energy and Power
Introduction to instrument transformers
Instrument transformers (ITs) are designed to transform voltage of current from the high values in the transmission and distribution systems to the low values that can be utilized by low… Read more
May 14, 2012 | By Edvard Csanyi
Cables
Sizing of power cables for circuit breaker controlled feeders (part 2)
Continued from article Sizing of power cables for circuit breaker controlled feeders (part 1) This criterion is applied so that cross section of the cable can carry the required load… Read more
May 13, 2012 | By Asif Eqbal
Cables
Sizing of power cables for circuit breaker controlled feeders (part 1)
The following three criteria apply for the sizing of cables for circuit breaker controlled feeders: [fancy_header]I. Short circuit current withstand capacity[/fancy_header] This criteria is applied to determine the minimum cross… Read more
May 10, 2012 | By Asif Eqbal
Energy and Power
Overvoltages Caused by Indirect Lightning Strokes
A direct stroke is defined as a lightning stroke when it hits a shield wire, a tower, or a phase conductor. An insulator string is stressed by very high voltages… Read more
May 08, 2012 | By Edvard Csanyi
Metering
An Overview Of Clamp Meter
Clamp-on ammeter or simply ‘clamp meter’ is an instrument that is used to measure the current flowing through a conductor. An AC Clamp meter basically consists of a current transformer… Read more
May 06, 2012 | By S
