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An overhead line with surge impedance of 400 Ω is terminated through a resistance R. A surge travelling over the line does not suffer any reflection at the junction, if the value of R is
- a)200 ohms
- b)2000 ohms
- c)800 ohms
- d)None of the above
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
An overhead line with surge impedance of 400 Ω is terminated thr...
When a loss-free overhead transmission line is terminated through a resistance equal to surge Impedance of the line, there will be no reflection of travelling wave hence the value of R is 400 Ω.
Important Points:
The surge impedance or characteristic impedance of a long transmission line is given by,
Z is series impedance per unit length per phase
Y is shunt admittance per unit length per phase
Surge Impedance for the transmission line is about 400 ohms it is around 40 ohms for underground cables.
Surge impedance loading (SIL):
Surge impedance loading is defined as the power load in which the total reactive power of the lines becomes zero. The reactive power generated by the shunt capacitance is consumed by the series inductance of the line.
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An overhead line with surge impedance of 400 Ω is terminated thr...
The surge impedance of an overhead line is a measure of its ability to transmit electrical energy. It is defined as the ratio of the line's voltage to current during a transient event, such as a lightning strike or switching operation.
If the surge impedance of an overhead line is 400, it means that for a given surge voltage, the line will carry a surge current of 1 amp. This surge impedance is typically measured in ohms and represents the characteristic impedance of the line.
The surge impedance is an important parameter in the design and operation of overhead lines. It helps determine the line's ability to handle transient events and protect against damage. A higher surge impedance indicates a line with greater ability to handle surges and prevent excessive voltage or current levels.
In practice, overhead lines are designed to have surge impedances that match the surrounding environment and system requirements. This ensures efficient transmission of electrical energy while maintaining reliability and safety.
If the surge impedance of an overhead line is 400, it means that for a given surge voltage, the line will carry a surge current of 1 amp. This surge impedance is typically measured in ohms and represents the characteristic impedance of the line.
The surge impedance is an important parameter in the design and operation of overhead lines. It helps determine the line's ability to handle transient events and protect against damage. A higher surge impedance indicates a line with greater ability to handle surges and prevent excessive voltage or current levels.
In practice, overhead lines are designed to have surge impedances that match the surrounding environment and system requirements. This ensures efficient transmission of electrical energy while maintaining reliability and safety.
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An overhead line with surge impedance of 400 Ω is terminated through a resistance R. A surge travelling over the line does not suffer any reflection at the junction, if the value of R isa)200 ohmsb)2000 ohmsc)800 ohmsd)None of the aboveCorrect answer is option 'D'. Can you explain this answer?
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