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The presence of earth in case of overhead transmission line
- a)increases capacitance
- b)increases inductance
- c)decreases capacitance
- d)decreases inductance
Correct answer is option 'A'. Can you explain this answer?
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The presence of earth in case of overhead transmission linea)increases...
Effect of Earth on Overhead Transmission Line
Capacitance of Overhead Transmission Line
- Capacitance is the ability of a conductor to store electric charge.
- The overhead transmission line consists of conductors in the air.
- The presence of the earth near the conductors increases the capacitance of the line.
- This is because the earth acts as a conductor and provides a path for the current to flow.
- The earth also acts as a dielectric material between the conductor and itself, which increases the capacitance.
Inductance of Overhead Transmission Line
- Inductance is the ability of a conductor to store energy in a magnetic field.
- The overhead transmission line consists of conductors in the air.
- The presence of the earth near the conductors decreases the inductance of the line.
- This is because the earth acts as a magnetic field and provides a path for the magnetic field to flow.
- The earth also acts as a magnetic material between the conductor and itself, which decreases the inductance.
Conclusion
- The presence of earth near the overhead transmission line affects both capacitance and inductance.
- The capacitance increases while the inductance decreases.
- This is due to the earth acting as both a conductor and a dielectric material for capacitance and as a magnetic field and magnetic material for inductance.
Capacitance of Overhead Transmission Line
- Capacitance is the ability of a conductor to store electric charge.
- The overhead transmission line consists of conductors in the air.
- The presence of the earth near the conductors increases the capacitance of the line.
- This is because the earth acts as a conductor and provides a path for the current to flow.
- The earth also acts as a dielectric material between the conductor and itself, which increases the capacitance.
Inductance of Overhead Transmission Line
- Inductance is the ability of a conductor to store energy in a magnetic field.
- The overhead transmission line consists of conductors in the air.
- The presence of the earth near the conductors decreases the inductance of the line.
- This is because the earth acts as a magnetic field and provides a path for the magnetic field to flow.
- The earth also acts as a magnetic material between the conductor and itself, which decreases the inductance.
Conclusion
- The presence of earth near the overhead transmission line affects both capacitance and inductance.
- The capacitance increases while the inductance decreases.
- This is due to the earth acting as both a conductor and a dielectric material for capacitance and as a magnetic field and magnetic material for inductance.
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The presence of earth in case of overhead transmission linea)increases...
Concept:
The capacitance of overhead transmission lines when the earth effect is neglected is given by
The capacitance of overhead transmission lines when the earth effect is considered is given by
In the above expressions, D is the interspacing distance between conductors, r is the radius of the conductors, and h is the height of the transmission line from the ground.
It can be observed that the presence of earth modifies the radius of the conductor from r to
Therefore the denominator as whole decreases and net capacitance increases.
The capacitance of overhead transmission lines when the earth effect is neglected is given by
The capacitance of overhead transmission lines when the earth effect is considered is given by
In the above expressions, D is the interspacing distance between conductors, r is the radius of the conductors, and h is the height of the transmission line from the ground.
It can be observed that the presence of earth modifies the radius of the conductor from r to
Therefore the denominator as whole decreases and net capacitance increases.
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