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Showing posts from December, 2014

Partial Discharge in HV & EHV Power Line

Partial Discharge in High and Extra High Voltage Line?Partial Discharge (PD) is very much important for Underground Power Cable. If you work with Power Cable, you must know the why and where Partial Discharge are presents. It will help to take action at right place in right time. 






In electrical engineering, partial discharge (PD) is a localized dielectric breakdown of a small portion of a solid or fluid electrical insulation system under high voltage stress, which does not bridge the space between two conductors. Partial discharges are small electrical sparks that occur within the insulation of medium and high voltage electrical assets. Each discrete partial discharge is the result of an electrical breakdown of an air pocket within the insulation. These discharges erode insulation and eventually result in insulation failure.
Partial discharge testing results can help predict future performance and reliability of critical assets, including: Cables, splices, and terminationsPower transform…

How does an Induction Motor work ?

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How does an Induction Motor work 
The AC induction motor is well suited to applications requiring constant speed operation. In general, the induction motor is cheaper and easier to maintain compared to other alternatives.
The induction motor is made up of the stator, or stationary windings, and the rotor. The stator consists of a series of wire windings of very low resistance permanently attached to the motor frame. As a voltage and a current are applied to the stator winding terminals, a magnetic field is developed in the windings. By the way the stator windings are arranged, the magnetic field appears to synchronously rotate electrically around the inside of the motor housing.
The rotor is comprised of a number of thin bars, usually aluminum, mounted in a laminated cylinder. The bars are arranged horizontally and almost parallel to the rotor shaft. At the ends of the rotor, the bars are connected together with a “shorting ring.” The rotor and stator are separated by an air gap which …

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