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When the length of an overhead transmission line is less than 80 km with an operating voltage upto 20 kV, it is considered to be a/an ___________.
  • a)
    long transmission line
  • b)
    short transmission line
  • c)
    medium transmission line
  • d)
    ultra-long transmission
Correct answer is option 'B'. Can you explain this answer?
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When the length of an overhead transmission line is less than 80 km wi...
Classification of Overhead Transmission Lines:
  • A transmission line has three constants R, L, and C distributed uniformly along the whole length of the line.
  • The resistance and inductance form the series impedance.
  • The capacitance existing between conductors for a 1-phase line or from a conductor to neutral for a 3-phase line forms a shunt path throughout the length of the line. Therefore, capacitance effects introduce complications in transmission line calculations.
 
Depending upon the manner in which capacitance is taken into account, the overhead transmission lines are classified as:
Short transmission lines:
When the length of an overhead transmission line is up to about 50 km to 80 km and the line voltage is comparatively low (< 20 kV), it is usually considered as a short transmission line. Due to smaller lengths and lower voltage, the capacitance effects are small and hence can be neglected. Therefore, while studying the performance of a short transmission line, only the resistance and inductance of the line are taken into account.
Medium transmission lines:
When the length of an overhead transmission line is about 80-150 km and the line voltage is moderately high (>20 kV < 100 kV), it is considered a medium transmission line. Due to the sufficient length and voltage of the line, the capacitance effects are taken into account. For purposes of calculations, the distributed capacitance of the line is divided and lumped in the form of condensers shunted across the line at one or more points.
Long transmission lines:
When the length of an overhead transmission line is more than 150 km and line voltage is very high (> 100 kV), it is considered a long transmission line. For the treatment of such a line, the line constants are considered uniformly distributed over the whole length of the line and rigorous methods are employed for the solution
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When the length of an overhead transmission line is less than 80 km wi...


Short Transmission Line Explanation:

Short transmission lines are those with a length less than 80 km and operate at voltages up to 20 kV. Understanding the classification of transmission lines is crucial in the field of electrical engineering.
Here are some key points to explain why a transmission line with these characteristics is considered a short transmission line:
  • Length: Short transmission lines typically have a length of less than 80 km. This relatively short distance allows for simpler design and operation compared to longer transmission lines.
  • Operating Voltage: Short transmission lines operate at voltages up to 20 kV. Lower operating voltages require less insulation and can reduce costs associated with the transmission line.
  • Performance: Short transmission lines have different characteristics compared to long transmission lines. They typically experience lower power losses and have different impedance characteristics.
  • Applications: Short transmission lines are commonly used in distribution networks, industrial applications, and rural electrical systems where the distance between the power source and the load is relatively short.


In summary, a transmission line with a length of less than 80 km and an operating voltage up to 20 kV is classified as a short transmission line due to its specific characteristics and applications in the field of electrical engineering.
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it depends on the length of the conductor the capacitance of the line is proportional to the length of the transmission line their effect is negligible on the performance of short having a length less than 80 km and low voltage transmission accidents of the transmission line along with the conductances forms the shunted mittens the conductance and the transmission line is because of the leakage over the surface of the conductor considered a line consisting of two conductors and be each of radius are the distance between the conductors being Des shown in the diagram below minus the potential difference between the conductors and via's work QA charge on conductor QB charge on conductor vvab pencil difference between conductor and the Epsilon minus absolute primitivity QA plus QV = 0 so that QA equals QB - equals DBA equals data equals DB equals our substituting these values and voltage equation we get the capacitance between the conductors is cab is referred to as lying to line capacitance if the two conductors are in VR oppositely charge then the potential difference between them is zero then the potential of each conductor is given by one half bath the capacitance between each conductor and point of zero potential and is capacitive CN is called the capacitance to neut or capacitance to ground capacitance cab is the combination of two equal capacity and VN series thus capacitance to neutral is twice the capacitance between the conductors IE CN equals to Cave the absolute primitivity Epsilon is given by Epsilon equals epsilono Epsilon are where epsilano is the permittivity of the free space and Epsilon or is the relative primitivity of the medium prayer capacitance reactants between one conductor and neutral capacitance of the symmetrical three phase line let a balanced system of voltage be applied to a symmetrical three-phase line shown below the phasor diagram of the three phase line with equilateral spacing is shown below take the voltage of conductor to neutral as a reference phaser the potential difference between conductor and we can be written the similarly potential difference between conductors and sea is on adding equations one and two we get also combining equation three and four from equation 6 and 7 the line to neutral capacitance the capacitance of symmetrical three phase line is same as that of the two wire line Related: Capacitance of Transmission Lines?

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When the length of an overhead transmission line is less than 80 km with an operating voltage upto 20 kV, it is considered to be a/an ___________.a)long transmission lineb)short transmission linec)medium transmission lined)ultra-long transmissionCorrect answer is option 'B'. Can you explain this answer?
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