0
Increase the voltage in the lines.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agoImpedance.
Add your answer:
Earn +20 pts
What is resonant and non resonant transmission line?
Non resonant transmission lines are longer than resonant lines. However, sometimes power is lost when power lines are too large, so the shorter ones may be favorable for certain frequencies.
What is an example of a step-up transformer?
Power stations use step-up transformers to transmit power at a high voltage instead of a high current. This reduces the power lost in the transmission lines.
Why does the national grid use different voltages?
When transferring power over distance, the designer of the power line selects a voltage that optimizes the amount of power that is transferred, ie, minimizes the amount of power that is lost. There are tradeoffs in the selection of a voltage for a transmission line, as there are in almost any aspect of design. Too low a voltage (which requires a higher current) results in increased resistive losses in the lines, or you have to use heaver wire, which increases costs, not just of the wire, but of the stronger towers needed to support the wire. Too high a voltage leads to corona discharge losses and losses due to capacitance between lines and lines to ground. In addition, an AC voltage can be easily changed from one voltage to another with very small loss in power. So bottom line, each distribution line has a voltage selected to be optimum for that line. Connections between lines of different voltages are easily done via transformers.wire has inherent resistance. Power lost in this resistance is equivalent to P = I*I*R, where I is the current. Reducing the amount of current will reduce the inherent losses due to transporting power long distances. Power is equivalent to P = V*I; So, if we reduce the current, we must increase the voltage to maintain the same amount of power.Simply put, it is much more efficient. There is less loss transmitting the same amount of power down a line using high voltage rather than a lower voltage. Let's look and see why. Consider that the transmission lines have resistive properties (in ohms/foot). These represent a fixed loss; we can't get around them. We start with Ohm's Law: V=IR, and the definition of Power: P=VI. Substituting IR for V, we see that P=I²R. What this tells us is that the amount of power lost in the lines is equal to the square of the current flowing through the lines, times the resistance of the lines. The amount of power transmitted is constant, and the resistance in the lines is constant. So, if we double the voltage, the current is cut in half, and the losses are cut in quarter. The simple mathematics drives (dictates) that we use as high a voltage as is practical to transmit power over long lines to minimize the loss.
How are transformers used in electricity transmission?
Transforming voltages, the primary and secondary voltages are universally linked by the number of primary and secondary windings upon the transformer core.A: Mostly for isolation and transferring of power to a level easily to useRead more: Why_is_a_transformer_usedBecause of the high cost of transmitting power at low voltage and high current levels, transformers satisfy a most critical part in electrical circulation frameworks. Utilities disseminate power over extensive territories utilizing high voltages, ordinarily called transmission voltages. Transmission voltages are ordinarily in the 35,000 volt to 50,000 volt range. We realize that volts times amps rises to watts, and that wires are measured based upon their capacity to convey amps. High voltage permits the utility to utilize little sizes of wire to transmit large amounts of force, or watts. You can perceive transmission lines in light of the fact that they are upheld by vast steel towers that you see around utility force plants and substations. As this power gets closer to its purpose of utilization it is changed over, through the utilization of transformers, to a lower voltage ordinarily called circulation voltage. Circulation voltages range from 2,400 to 25,000 volts relying on the utility. Dissemination lines are the ones that sustain the shaft mount and cushion mount transformers found nearest to your home or spot of business. These transformers change over the dissemination voltages to what we call use voltages. They are ordinarily underneath 600 volts and are either single-stage or three-stage and are used for working hardware, including lights and vacuum cleaners in our homes, to engines and lifts where we work. This is the time when the Dry-Type Distribution Transformer becomes possibly the most important factor. It is utilized to change over the voltage gave by the utility to the voltage we have to work different hardware.
When did the United States stop using DC power in your homes?
We never did, that battle was lost before electrical transmissions lines where anywhere near common.
Why energy is lost from power transmission cables?
Losses are mainly due to electrical resistance.
What is resonant and non resonant transmission line?
Non resonant transmission lines are longer than resonant lines. However, sometimes power is lost when power lines are too large, so the shorter ones may be favorable for certain frequencies.
What is an example of a step-up transformer?
Power stations use step-up transformers to transmit power at a high voltage instead of a high current. This reduces the power lost in the transmission lines.
How energy lost during transmission?
It's lost as thermal heat to surroundings.
How is energy lost whilst electricity is being transmitted?
Power lines have a certain amount of resistance which results in a conversion of some electricity to waste heat.
Why step up transformer is required to send energy at long distances How energy losses reduces by using step up voltage while sending it to long distances?
Power is basically voltage times current. The power lines have resistance and that causes a loss of some power in transmitting the power over long lines. When the power is sent at a higher voltage, the current is lower, which means that the power lost in the wires is less. A rule of thumb for power transmission is to use 1000 volt per kilometre so for a 33 km line you would use 33 kV.
What can you power with1 million kw?
The reason electricity is trsnsmitted at very high voltage is to reduce energy loss. As Power = V x I and heat loss = I2 R. Thus if I the current is low the energy lost in the transmission cables will be minimal. The reason electricity is trsnsmitted at very high voltage is to reduce energy loss. As Power = V x I and heat loss = I2 R. Thus if I the current is low the energy lost in the transmission cables will be minimal.
How are step up transformers used in the transmission of electric energy?
Step-up Transformers used in the transmission of electrical energy increase the voltage going over Transmission Lines (over 100,000 Volts). For a given amount of POWER to be Transmitted, the higher the Voltage, the LOWER the CURRENT. This reduces the amount of Power LOST to the Resistance of the Transmission Lines. Power Lost is calculated by the Formula: POWER Lost = I2 x R, where I=Current and R=Resistance So, the lower the Current (I), the lower the transmission line losses. At the end of the Transmission Path the Voltage is "Stepped Down" to a value usable for the Customer, usually (220 volts for Residential use in the USA).
What energy is lost from nuclear energy?
Some heat is lost in the vapour that rises from the power plant.
What is a lossless transmission line?
A lossless transmission line is when no energy is lost during transmission of energy from a particular source to destination by a certain material, ie. copper wire. In other words, this material that transmits energy, absorbs none of the energy transmitted. No energy is lost to the material during transfer of energy. It is like saying it is an absolutely perfect conductor having no resistance.
Why must transmission lines be run at high voltage and low current?
Assume that only 120 volts is transmitted from the power stations throughout the whole distribution network. Then for 10 megawatt [as used by a VERY SMALL town ] the current would be have to be very high so the cables would have to be very thick and heavy - and therefore very expensive to buy and to install - because if they were thin their resistance would cause a huge amount of power to be wasted, just heating up the air, which means the energy lost as heat from the lines would be enormous. But, by using 500 kilovolts to send 10 megawatt to the same town, the current would be very small so the cables can be thin and much cheaper to buy and to install and the energy lost as heat from the lines would be much less. That is the reason for using high voltage transmission lines.
Where is the energy lost with in a power station?
cooling towers
