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You want to deliver power as efficiently as possible. For the same input power, the higher the voltage, the lower the current required. The lower the current, the lower the ohmic power loss (R * I^2) during power transmission in the electric cable.
Answer- allows the use of conductors of practicable size
- economics (less volume of copper)
- reduce voltage drop along line
- reduce energy losses along line
Wiki User
∙ 12y ago
Wiki User
∙ 9y agoIt 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 guide to the voltages used is 2 kV per kilometre.
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Why ac transmission voltage is 765 kv?
For a given load, the higher the supply voltage, the lower the resulting load current. So high voltages are essential for electricity transmission, in order to avoid enormous voltage drops, a need for conductors for huge cross-sectional areas, and to reduce line losses. Actual transmission sytem voltages are determined by the electricity-supply standards used in the country in which you live.
Why During transmission of power it is transformed as high voltage rather than high current how is this possible as current and voltage are directly proportional?
Voltage and current are actually inversely proportional to one another. The formula P=IV is what you need to look at here, where P is Power, V is voltage, and I is current. Rearranging the equation you will see that V = P/I. You can see that if you increase voltage, while holding power constant, current is reduced. Now, to your question. The losses on a transmission line are proportional to the current flowing on the line, so transmitting at high voltage (and hence low current) is beneficial as it reduces the amount of power that is lost due to resistance in the line itself.
What is the need for generating high voltages in laboratories?
we generate high voltage (DC,AC or Impuse) purposely for insulation testing of various components in power systems. Physics labs need high voltage to accelerate subatomic particles.
What is step up transformer?
To transmit a lot of electrical power, you either need a high voltage or a high current. But a higher current means your cables got hotter and you lose a lot of energy so is better to use higher voltage. To increase the voltage, we need to use a step up transformers. Step up transformers are transformers which has ability to increase the voltage and they have more turns on the secondary coil on the primary coil.
How do you measure the current and voltage in high tension line?
To measure high voltage use suitable instrument transformer (potential transformer) Very carefully. It can kill you. The higher the voltage the more the danger or arcing over even when two conductors are not touching. Voltage meters are rated and the rating should not be exceeded. Depending on the voltage you will need the proper meter and a high voltage probe rated for the voltage you are measuring. If you don't know what you are doing, don't mess with high voltage. Leave to the pros.
Why dc transmission is not used below a particular distance?
In a power transmission there is a need for step up and step down the voltage for a certain distance. So we cant use dc for a particular distance.AnswerD.C. transmission is used for long-range extra-high voltage transmission, for under-sea high-voltage transmission, and for international 'links'. The equipment for achieving these voltages is far more complicated/expensive compared with transformers, making short distance d.c. transmission uneconomical.
What are the difference between high voltage and low voltage?
Hi, The main difference is Fuel consumption. High current genertors always consumes much fuel because the load on the engine will be high. The high voltage low current generators doesn't need much fuel to run. You can understand this by comparing 1 kva and 5 kva single phase generators. For both generators voltage will be same (230v) But output current differs. So the fuel consumption also differs. But you get a high current source. Low voltage high current generators can be used for welding kind of stuffs which needs high current to do the job. If you have step down transformer then you can save the fuel.
Why ac transmission voltage is 765 kv?
For a given load, the higher the supply voltage, the lower the resulting load current. So high voltages are essential for electricity transmission, in order to avoid enormous voltage drops, a need for conductors for huge cross-sectional areas, and to reduce line losses. Actual transmission sytem voltages are determined by the electricity-supply standards used in the country in which you live.
How does varistors work?
A varistor is essentially a transient voltage suppressor or a surge protector. They are used in a number of devices that need a consistent voltage across the system for reliable operation. In the power industry, varistors are used in high voltage transmission systems to protect the grid from line surges caused by things like lightning strikes. Varistors are variable resistors that act as a shunt, allowing the flow of current under normal voltage but restricting current flow at or above the clamping voltage-the voltage required to trigger the sintering of the varistors zinc oxide and ceramic matrix. Varistors are vital in all electrical transmission applications, but new and better varistors are needed to protect extremely high voltage systems from line surges. Varistor technology is one of the limiting agents on the maximum voltage of high voltage transmission systems. Using zinc-oxide nanoparticles in the varistor matrix will produce varistors with better performance characteristics, ultimately increasing reliability, more efficient transmission technologies and smaller vasristors. This technology will aid in the development of super high voltage transmission networks that operate at voltages as high as 1500kV while still maintaining grid stability.
Why is voltage regulation important in alternator?
because the voltage should be constant as the full transmission grid need ame voltage for synchronization of alternatos of grid
What microphone uses external voltage supply such as a battery?
Look at the microphone datas, they will tell you, what external voltage you need. Only dynamic microphones like the Shure SM57 need no extra voltage.
How does ZnO varistor work?
A varistor is essentially a transient voltage suppressor or a surge protector. They are used in a number of devices that need a consistent voltage across the system for reliable operation. In the power industry, varistors are used in high voltage transmission systems to protect the grid from line surges caused by things like lightning strikes. Varistors are variable resistors that act as a shunt, allowing the flow of current under normal voltage but restricting current flow at or above the clamping voltage-the voltage required to trigger the sintering of the varistors zinc oxide and ceramic matrix. Varistors are vital in all electrical transmission applications, but new and better varistors are needed to protect extremely high voltage systems from line surges. Varistor technology is one of the limiting agents on the maximum voltage of high voltage transmission systems. Using zinc-oxide nanoparticles in the varistor matrix will produce varistors with better performance characteristics, ultimately increasing reliability, more efficient transmission technologies and smaller vasristors. This technology will aid in the development of super high voltage transmission networks that operate at voltages as high as 1500kV while still maintaining grid stability.
Why During transmission of power it is transformed as high voltage rather than high current how is this possible as current and voltage are directly proportional?
Voltage and current are actually inversely proportional to one another. The formula P=IV is what you need to look at here, where P is Power, V is voltage, and I is current. Rearranging the equation you will see that V = P/I. You can see that if you increase voltage, while holding power constant, current is reduced. Now, to your question. The losses on a transmission line are proportional to the current flowing on the line, so transmitting at high voltage (and hence low current) is beneficial as it reduces the amount of power that is lost due to resistance in the line itself.
How do you improve impulse voltage withstand level in high voltage voltage transformers?
There is a new organic oil being produced. It has a higher dielectric value. You can read about it in Transmission & Distrobution archives.You can also havhe XFMR wound with inverter duty wire. You also need high impedance grounding resistor sized correctly. You can also add reactors and capicator banks.
What is the need for generating high voltages in laboratories?
we generate high voltage (DC,AC or Impuse) purposely for insulation testing of various components in power systems. Physics labs need high voltage to accelerate subatomic particles.
Size of wire need for 3 KW turbine for transmission?
To answer this question the voltage of the system is needed.
What is step up transformer?
To transmit a lot of electrical power, you either need a high voltage or a high current. But a higher current means your cables got hotter and you lose a lot of energy so is better to use higher voltage. To increase the voltage, we need to use a step up transformers. Step up transformers are transformers which has ability to increase the voltage and they have more turns on the secondary coil on the primary coil.
