High Voltage and Power System Stability Interview Questions
High Voltage (HV) Interview Questions Answers Why Earth Wire is provided in the overhead transmisssion lines? Earth wire is provided above the overhead transmission lines for protection against lightning strokes.…
Voltage Control & Circuit Breakers Interview Questions
Voltage Control Interview questions How the Voltage Control in power system is achieved? Voltage control is achieved by suitably installing voltage control equipment at specified places such as at Generating…
Reactive Power Sources and Sinks in Power System
Dynamic Reactive Power Sources: It includes reactive power compensators which have the ability to respond within duration of cycles and try to balance the reactive power requirement in the system.…
Charging Currents in Transmission Lines
Any two conductors separated by an insulating medium constitutes a condenser or capacitor.In case of overhead transmission lines, two conductors form the two plates of the capacitor and the air…
Voltage Variations Effects on Power Plant Equipment
When the voltage at the terminal of the electrical equipment deviates from the value as specified from the name plate the equipment performance and life time of the equipment are…
Factors affect Voltage Level Selection in Service System
Some of the factors that effect the selection of nominal voltage levels for the service systems are: Type and size of the load to be served Distance to which power…
Harmonics Disadvantages in Power System
Sources of Harmonics: Several sources of harmonic currents that may be found on electrical power distribution networks are listed below: Variable speed motor drives Rectifiers Arc furnaces Wielding equipment Uninterrupted…
Induction Motor Operating Characteristics
All torques of an induction motor, at a given slip, vary approximately as the square of the voltage applied to its terminals Low rotor resistance results in high full load…
Generating Station Grounding Principles
Grounding systems in the generating stations should able to meet the following grounding principles: Grounding Principles: Metallic enclosure on electrical equipment and exposed non current carrying conductive materials in generating…
Ferroresonance in Power Transformers
Ferroresonance:Â Ferroresonance phenomenon can be triggered off through interaction of the system capacitance with a non-linear inductance, when transformer is at no-load. This oscillatory phenomenon or resonance phenomenon result in…
