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What are galloping vibrations in overhead transmission line conductors?
Galloping vibrations in overhead transmission line conductors refer to a type of oscillatory motion that can occur under specific environmental conditions, particularly in windy weather. This phenomenon is characterized by large amplitude, low-frequency oscillations of the conductors, which can resuRead more
Galloping vibrations in overhead transmission line conductors refer to a type of oscillatory motion that can occur under specific environmental conditions, particularly in windy weather. This phenomenon is characterized by large amplitude, low-frequency oscillations of the conductors, which can result in significant mechanical stress on the transmission line towers and fittings. Galloping typically happens when the conductor’s aerodynamic surface interacts with the wind, causing alternating lift forces that lead to the conductor moving in a sinusoidal pattern. This can potentially lead to conductor cable wear, deterioration, or even failure if not managed properly. Galloping is particularly concerning in areas prone to ice accumulation, as the added weight can exacerbate the oscillatory motion.
See lessWhat are aeoline vibrations in overhead transmission line conductors?
Aeoline vibrations, also known as aeolian vibration, refer to the oscillations that occur in overhead transmission line conductors due to wind. These vibrations are caused by the interaction of the wind with the conductors, leading to small amplitude, high-frequency oscillatory motions. They typicalRead more
Aeoline vibrations, also known as aeolian vibration, refer to the oscillations that occur in overhead transmission line conductors due to wind. These vibrations are caused by the interaction of the wind with the conductors, leading to small amplitude, high-frequency oscillatory motions. They typically occur in overhead lines under steady wind conditions and can result in significant fatigue damage over time if not properly managed. The vibrations can be influenced by factors such as the wind speed, conductor design, spacing, and tension. To mitigate these vibrations, various techniques, such as installing dampers, can be employed to reduce the potential for damage and maintain the integrity of the transmission lines.
See lessWhat will be the resultant weight on per meter of length of conductor if weight of conductor is 150 kg/m, weight of ice in per meter of length is 60 kg/m and wind force is 200 Kg/m.?
To find the resultant weight on per meter of length of the conductor, we need to consider the weights of the conductor, the ice, and the effect of wind force.The resultant weight is given by the formula:Resultant Weight = Weight of Conductor + Weight of Ice - Wind ForceGiven:Weight of Conductor = 15Read more
To find the resultant weight on per meter of length of the conductor, we need to consider the weights of the conductor, the ice, and the effect of wind force.
The resultant weight is given by the formula:
Resultant Weight = Weight of Conductor + Weight of Ice – Wind Force
Given:
Weight of Conductor = 150 kg/m
Weight of Ice = 60 kg/m
Wind Force = 200 kg/m
Now substituting the values:
Resultant Weight = 150 kg/m + 60 kg/m – 200 kg/m
Resultant Weight = 210 kg/m – 200 kg/m
Resultant Weight = 10 kg/m
Therefore, the resultant weight on per meter of length of the conductor is 10 kg/m.
See lessAs compared to a p-n junction diode(of the same rating), a Schottky diode has ___________
As compared to a p-n junction diode (of the same rating), a Schottky diode has a lower forward voltage drop and faster switching speed.
As compared to a p-n junction diode (of the same rating), a Schottky diode has a lower forward voltage drop and faster switching speed.
See lessAn overhead transmission line has a span of 220 metres the conductor waiting 0.604 kg/m. What will be the maximum sag if the working tension is 2879 kg.
To calculate the maximum sag of an overhead transmission line, we can use the formula for sag in terms of span length (L), conductor weight per unit length (w), and working tension (T):[ S = frac{wL^2}{8T} ]Where:- ( S ) = maximum sag- ( w ) = weight of the conductor per unit length (kg/m)- ( L ) =Read more
To calculate the maximum sag of an overhead transmission line, we can use the formula for sag in terms of span length (L), conductor weight per unit length (w), and working tension (T):
[ S = frac{wL^2}{8T} ]
Where:
– ( S ) = maximum sag
– ( w ) = weight of the conductor per unit length (kg/m)
– ( L ) = span length (m)
– ( T ) = working tension (kg)
Given:
– ( w = 0.604 , text{kg/m} )
– ( L = 220 , text{m} )
– ( T = 2879 , text{kg} )
Now plug in the values:
[ S = frac{0.604 , text{kg/m} times (220 , text{m})^2}{8 times 2879 , text{kg}} ]
Calculating the values:
1. Calculate ( (220 , text{m})^2 = 48400 , text{m}^2 )
2. Multiply by ( 0.604 , text{kg/m} ):
[ 0.604 times 48400 approx 29281.6 ]
3. Calculate ( 8 times 2879 ):
[ 8 times
See lessWhat happens to the tension in a conductor hanged between two poles, when temperature varies?
The tension in a conductor suspended between two poles is affected by temperature changes due to the thermal expansion of the material. When the temperature increases, the conductor expands, which generally leads to a decrease in tension if the ends remain fixed. Conversely, when the temperature decRead more
The tension in a conductor suspended between two poles is affected by temperature changes due to the thermal expansion of the material. When the temperature increases, the conductor expands, which generally leads to a decrease in tension if the ends remain fixed. Conversely, when the temperature decreases, the conductor contracts, which typically results in an increase in tension. This is because the length of the conductor changes with temperature, impacting the tension due to its weight and the forces acting on it.
See lessWhich of the following are/is the majority charge carriers in a Schottky diode?
In a Schottky diode, the majority charge carriers are electrons.
In a Schottky diode, the majority charge carriers are electrons.
See lessWhen the p-n junction diode is reversed biased, the width of the depletion region __________
When the p-n junction diode is reversed biased, the width of the depletion region increases.
When the p-n junction diode is reversed biased, the width of the depletion region increases.
See lessWhen the p-n junction diode is forward biased, the width of the depletion region__________
When the p-n junction diode is forward biased, the width of the depletion region decreases.
When the p-n junction diode is forward biased, the width of the depletion region decreases.
See lessA diode is said to be forward biased when the
A diode is said to be forward biased when the anode is connected to a higher voltage than the cathode, allowing current to flow through the diode.
A diode is said to be forward biased when the anode is connected to a higher voltage than the cathode, allowing current to flow through the diode.
See less