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Monthly Archive for: «December, 2012»

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

Power Line Carrier Communication (PLCC)

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

Rogowski Coil Construction

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

The Role of Fuses in Low Voltage Systems

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

How Distribution Systems Control Customer Loads?

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

Methods of Controlling Lightning Overvoltages in HV

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

How Power Transformer Produces Acoustical Noise?

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

Classes, Speed Control and Starting of DC motors

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

What Is The Basic Insulation Level (BIL)

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

Arrangements of LV Utility Distribution Networks


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