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Why humming sound occur in extra high tension transmission lines?
The noise is better described as 'buzzing', rather than 'humming', and it is caused by the breakdown of the air's insulating properties, due to stress caused by electric fields set up in the vicinity of where the conductors are supported from insulators. The noise is accompanied by a pale blue discharge which becomes visible after dark.
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High voltage lines are used for power transmission because the high voltage means that less current flows for a given amount of energy transmitted. The lower current flow mean…s that the heating effect in the wires is smaller, so the wires stay cooler and lose less energy through heating.
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Poorly matched terminating impedances will result in high reflection. Tuning networks on both ends are used to tune the source and load to the same impedance as the transmissi…on line.
1. Wire resistance 2. Leakage around insulators 3. People stealing the power
Each insulator is rated according to its ability to insulate. For example, if one insulator is good for x volts, then four insulators will be required for a line conductor ope…rating at 4x volts with respect to earth (ground). However, additional insulators might also be inserted to compensate for local conditions -e.g. salt deposit (near the sea), industrial pollution (near factories), etc.
from what i can remember its so that less energy is wasted when the electricity travels through the national grid . the voltage is then decreased afterwards .
The balls on overhead conductors are, belive it or not to make them visable to birds, helecoptors and planes etc, so they wont fly in to them. They have no electric…al purpose what so ever, Sorry to sat its that simple!! Colin
To reduce the power losses or conduction losses in transmission lines. - Yes its right. I will give a slightly improved answer. The size of coper conductor used for transm…ission lines is inversely proportional to the square of voltage transmitted. Hence normally for long transmission lines the voltage is increased to a very high value so as to reduce the amount of copper conductor used, hence reduce losses. Answer For a given load, the higher the supply voltage the lower the load current. The primary reason for using high-voltage transmission lines is to reduce the otherwise enormous voltage drops that would take place along the lines. The secondary reasons are to enable the use of conductors of practical size, and to minimise line losses.
higher phase shift lower impedance
its just your brain increasing its sensitivity to noises. it could almost be considered a noise floor, or possibly the blood vessels in your ear. as red blood cells pass throu…gh the capillaries, they bump the walls a bit, causing minuscule vibrations to the eardrum.
I you have the All Wheel Drive (AWD) version - you should check the level of the fluid in your rear differential case. If the level of fluid is okay, you may have a rear… wheel bearing that is going bad.
Tension is a force acting on a body and it occurs when the body is in a state of work.The direction of force acts on the opposite direction of work done.
YES BUT INSULATED CABLE ARE USED
I drove under high tension wires in a truck and could clearly hear a buzzing noise. I actually stopped the truck and sat under the wire for a moment to listen to the sou…nd. As I recall it was a very humid day. I don't know if this is true but suspect the damp air had something to do with it.
the current causes alternating magnetic fields which shake the wires and they get warm so snow and rain sizzle off the wires.
It is necessary for transmitting power over long distances, because the use of a higher voltage enables the power loss in the resistance of the cables. A useful guid…e to the voltages used is 2 kV per kilometre.