Control Valves Theory
The flow regulation  in a valve is accomplished  by the varying  resistance as the valve  is stroked, i.e. its effective cross sectional area is changed. As the fluid moves from…
PID Controller Gains Effect on Manipulated Variable
Observe the Effect of Proportional Gain Kp, Integral Gain Ki and Derivative Gain Kd values with respect to PID Controller Output response shown in below animation. The below graph shown is…
Advantages and Disadvantages of Squirrel Cage Induction motor
Squirrel Cage Induction Motor: Squireel cage induction motors are widely used in industries. Almost 70% of the industrial motors and drives comes under these category. In Squirrel cage induction motors, rotor windings wound in squirrel cage. These…
Advantages of Bundled Conductors in Transmission Lines
For transmission of more power for long distances to load centers Extra High Voltage (EHV) transmission is employed. Implementing Extra High Voltage has advantage of reduction in the copper losses…
Difference between Solid Conductor and Stranded Conductor
Difference between Solid Conductor and Stranded Conductor Solid Conductor: It consists of single piece of metal wire. It is cheap for manufacturing.Skin effect is higher in solid conductors as at…
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…
Sulfur Hexafluoride Gas (SF6) Properties
Sulfur Hexafluoride Gas (SF6) Properties Heavy, chemically inert, non toxic No poisonous effect on the human body but decomposition products are poisonous Color less and odor less It is gaseous at normal room…
DC machines and Induction Machines Viva Questions & Answers
When DC Generator fails to build up the voltage, what are the reasons? No residual magnetism, reversal of field connections and the resistance in the load circuit may be greater…
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…
