Power Line Carrier Communication (PLCC)
Use of PLCC in modern electrical power system is mainly for telemetry and telecontrol. Tele means remote. Telemetry refers to science of measurement from remote location. Introduction Major goal/Application of PLCC Main Components of PLCC:… Read more
Dec 14, 2012 | Asif Eqbal
Rogowski Coil Construction
Figure 1 shows the construction of a Rogowski coil, an air-core current transformer that is especially well suited to measuring ripple currents in the presence of a DC component or measuring pulsed currents. The raw… Read more
Dec 13, 2012 | Edvard
21 Safety Rules for Working with Electrical Equipment
A safe work environment is not always enough to control all potential electrical hazards. You must be very cautious and work safely. Safety rules help you control your and others risk of injury or death… Read more
Dec 12, 2012 | Edvard
The Role of Fuse in Low Voltage Systems
A fuse is the very important protective device used to automatically disconnect a live circuit when a predetermined value of current & or time of predetermined current is exceeded. To simplify, fuse is actually the wire… Read more
Dec 11, 2012 | Edvard
How Distribution Systems Control Customer Loads?
Distribution systems obviously exist to supply electricity to end users, so loads and their characteristics are important. Utilities supply a broad range of loads, from rural areas with load densities of 10 kVA/mi2 to urban… Read more
Dec 10, 2012 | Edvard
Methods of Controlling Lightning Overvoltages in HV
For well shielded transmission lines, the backflashover condition, close to the substation, is of prime concern for determining the location and number of surge arresters required to achieve insulation coordination of the substation for lightning… Read more
Dec 08, 2012 | Edvard
Lighting Circuits Connections for Interior Electrical Installations
Electrical lines which include lighting circuits begin from the main distribution panel of the installation and each line contains three conductors: phase, neutral and ground. All three conductors reach to the terminal point of each… Read more
Dec 07, 2012 | Emmanouil Angeladas
Basic Mechanical Terms Used In Drives Applications
Terms below are the basic mechanical terms associated with the mechanics of DC drive operation. Many of these terms are familiar to us in some other context. Force Net Force Torque Speed Linear Speed Angular… Read more
Dec 06, 2012 | Edvard
How Power Transformer Produces Acoustical Noise?
This technical article explains the acoustic noise generating mechanism inside power transformers. Transformer noise has two sources: winding vibrations and core vibrations. The single most effective way to reduce windings noise is by having a good… Read more
Dec 05, 2012 | Edvard
Classes, Speed Control and Starting of DC motors
D.C. motors are divided into three classes, as follows: series-wound motor, shunt-wound motor and compound-wound motor. Let’s take a word about each of motor class. In this type (Figure 1) the field is in series… Read more
Dec 04, 2012 | Edvard
What Is The Basic Insulation Level (BIL)
Insulation levels are designed to withstand surge voltages, rather than only normal operating voltages. Since the insulation lines and equipment is protected by surge arresters draining the surges rapidly before the insulation is damaged, the… Read more
Dec 03, 2012 | Edvard
Arrangements of LV Utility Distribution Networks (2)
Continued from the previous part: Arrangements of LV Utility Distribution Networks (1) In the past, an underground cable service or the wall-mounted insulated conductors from an overhead line service, invariably terminated inside the consumer’s premises, where the… Read more
Dec 01, 2012 | Edvard
