EE6701 High Voltage Engineering Important questions

EE6701 High Voltage Engineering Important questions Regulation 2013 Anna University free download. EE6701 Important questions High Voltage Engineering free pdf download.

Sample EE6701 High Voltage Engineering Important questions:

1. Write some applications of high voltage?

Cathode ray tubes, particle accelerators, Xerography, Electrostatic precipitators,
Nuclear Research

(ee6701 high voltage engineering important questions)

2. What are the causes of over voltages in a power system?

Lightning and Switching surges are the causes of overvoltages.

3. What are the theories associated with the formation of charges in clouds?

• Simpson’s theory
• Reynold’s and mason’s theory

4. What are the types of lightning strokes

• Direct stroke
• Indirect stroke

(ee6701 high voltage engineering important questions)

5. What are the sources of switching surges?

• De-energizing of the lines, cables and shunt capacitors
• Disconnection of unloaded transformers and reactors
• Opening and closing of the protective devices
• Arcing ground

6. What are the factors to be considered for switching over voltages in EHV and UHV system?

• Interruption of low inductive currents by high speed circuit breakers
• Ferro resonance condition
• Interruption of fault current when the fault is cleared

(ee6701 high voltage engineering important questions)

7. What are the methods to control overvoltage due to switching and power frequency?

• One or multi-step energization of lines by inserting resistors.
• Phase controlled closing of Circuit breakers with proper sensors.
• Drain the trapped charges before reclosing the lines
• Using shunt reactors
• By using lightning arrestors or surge arrestors.

8. Write the causes of power frequency overvoltages.

• Sudden load rejection
• Disconnection of inductive and capacitive loads
• Ferranti effect
• Saturation in transformers
• Tap changing operation (ee6701 high voltage engineering important questions)

9. What are the various methods of protecting the power system from lightning?

• Using Ground wires
• Using ground rods
• Using counter poise wires
• Using protective devices like rod gap, expulsion and valve type surge arrestors.

10. What are the uses of ground wires?

It is used for direct stroke protection of lines for voltages of 110 kv and above and from attenuation of travelling waves in the line.

(ee6701 high voltage engineering important questions)