Corona Ring on Surge Arresters and other EHV equipment
Have you ever seen a ring around the Surge Arrester or other EHV equipment? What is the purpose of the Ring around the Extra High Voltage (EHV) equipment? What is the use...
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Power Systems
Advantages and Disadvantages of Per Unit System
In power system analysis, per unit (pu) system is used to express a physical variable as a fraction of base or reference value. Per Unit (pu) is commonly used for...
Why Symmetrical Components Used for Unbalanced faults in Power System
Symmetrical Components: Any unbalanced three phase system of currents, voltages or other sinusoidal quantities can be resolved in to three balanced of phasors which are known as symmetrical components of...
Advantages & Disadvantages of AC power and DC power
First electric power system was build in New York city in 1882. DC power was generated by steam generator supplying power to 59 consumers. During the decade many small power systems...
Rotor Angle Stability of Synchronous Generators in Power System
Rotor Angle Stability: Rotor angle stability is the ability of the interconnected synchronous machines running in the power system to remain in the state of synchronism. Two synchronous generators running...
Harmonics effect on Transformer
Harmonics distortion effect on Power System and their impact on Induction Motors are already discussed. Some of the disadvantages of harmonics and their impact on the transformers are: RMS current increase Eddy Current loss increases DC offset...
Why Reactive Power is Generated at Load
Reactive Power if possible should be generated close the load centers or close to the point of its consumption. Some of the reasons why reactive power cannot be transmitted to long distances...
Harmonics effect on Induction Motor
Harmonics in the power system are generated due to the usage of non linear load. Some of the effects of harmonics on the performance of induction machine are: Core losses in...
Auto Recloser Circuit Breaker in Power System
Most of the faults on over head lines are transient in nature. About 85% to 90% of faults are momentary and caused by tree branches, lightning, birds etc. These conditions...
Current Limiting Reactors and Short Circuit Currents
A current limiting reactors is also called as series reactors. It is an inductive coil having large inductive reactance compared to the resistance and is used to limit the short...