TRANSMISSION LINES DESIGN and ELECTRICAL ENGINEERING HUB

Skin Effect in AC circuit is the tendency of the current to crowd toward the outer surface. This results in a current density that is greater near the outer surface of the conductor. Skin effect is more relevant in AC system since it involves frequency. All electric currents generate magnetic fields that in turn can affect the current (this is the principle behind electric guitar pickups). In a direct current case everything is constant and so nothing seems to happen. With an alternating current, however, there is a delay in the magnetic field's response to the change in current and the 'old' magnetic field tends to push the current towards the outside of the conductor. Skin Effect causes the longitudinal element of the conductor near the center of the axis to be surrounded by more lines of magnetic force than near the rim. This results in an increase in inductance toward the center. Skin Effect increases the AC resistance of the conductor relative to the DC r...

Two words that in recent times have been linked. Some said that living near transmission lines have its ill effects. While other would debunk that, calling it a myth. Transmission Lines, or power lines in general has been feared not only due its high voltage, but feared that it has bad effects on the human's body, particularly that could cause leukemia and any other forms of cancer. That not much have been said about the relationship of Power Lines and Cancer in an official terms. This entry is about a collection of news, articles that may be of help in understanding this sensitive issue. There is in no way that the site condemn or defend those in the Power Transmission Lines Business. Feel free to leave some comments, and suggest links similar to the ones provided below. Power Transmission Lines and Cancer, and everything in between. Do High-Voltage Power Lines Cause C ancer (Studies link Electromagnetic Fields (EMFs) To Illness) A growing body of scientific evidence ...

 When the line voltage applied to a polyphase induction motor are not equal, unbalanced currents in the stator windings will result. A small percentage voltage unbalance will result in a much larger percentage current unbalance. Consequently, the temperature rise of the motor operating at a particular load and percentage voltage unbalance will be greater than for the motor operating under the same conditions with balanced voltages. Should voltages be unbalanced, the rated horsepower of the motor should be multiplied by a factor to reduce the possibility of damage to the motor. Operation of the motor above a five percent voltage unbalance condition is not recommended. Alternating current polyphase motors shall operate successfully under running conditions at rated load when the voltage unbalance at the motor terminals does not exceed 1 percent. Performance will not necessarily be the same as when the motor is operating with a balanced voltage at the motor terminal...

As interest in tidal-electric power generation continues to grow in response to demands for renewable sources of energy, readers can now turn to Elements of Tidal-Electric Engineering for the first comprehensive treatment of the subject. The author, Robert H. Clark, a leader in the field for almost fifty years, has spearheaded several important research projects and consulted with governments and private industries around the world on tidal-electric issues. The focus of this text is the feasibility study. Power engineers gain both the knowledge and the skills needed to accurately determine the feasibility of a proposed tidal power development plan, including: * Major factors to consider in selecting a site for preliminary assessment * Tidal power schemes and mode * Hydraulic and mathematical models of estuaries to predict the estuary's response to physical changes and the effects caused by operation of the proposed plant * Civil works required for tidal power de...

This is an amazing book on basic concepts of electric circuits. Itcovers fundamental aspects of electric circuits that form the core of many engineering disciplines. In particular, basic circuit elements and their characteristics are presented when connected in an electric network. In addition, techniques to analyse and solve electric circuits are explained in a simple manner and examples are shown to demonstrate each strategy.  DC as well as AC circuit analysis is provided with a brief account of filters in the end. Difficult electric circuit concepts such as sinusoids and phasors are explicated in an effective way so that basic understanding can be properly achieved.covers fundamental aspects of electric circuits that form the core of many engineering disciplines. In particular, basic circuit elements and their characteristics are presented when connected in an electric network. In addition, techniques to analyse and solve electric circuits are explained in a s...