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1. Wire resistance
2. Leakage around insulators
3. People stealing the power
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∙ 13y ago
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Why is energy lost in power transmission lines?
Increase the voltage in the lines.
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.
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.
Why copper is used in electrical transmission line?
Copper is a good conductor and is fairly strong. It generally is not used in power transmission lines due to cost - generally aluminimum is used.
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.
To reduce power losses in transmission lines the voltage is made?
Much higher.
What does power loss in electrical transmission mean?
The term, 'power loss', describes the rate of energy losses caused by the load current in the transmission lines
Is reactance major responsible for power loss in power transmission lines?
Reactance certainly causes loss in a transmission system, but I^2R or resistance losses are greater.
Why does a 2003 impala transmission loses power?
TRANSMISSION LINE LOSSES
What is the purpose of having a low impedance for transmission lines?
in order to reduce the transmission line losses we need low impedance...Low impedance also improves power transfer capacity of the line..
What is an anchor pylon?
An anchor pylon is an end point which utilizes horizontal insulators and occur at the end points of high-power transmission lines.
Why is energy lost in power transmission lines?
Increase the voltage in the lines.
What power lines send electricity over a nationwide network?
Transmission lines
Need of ehv transmission lines?
Carry electrical power over extremely long distanceswith minimal I2*R losses. The higher the line voltage the lower the current the line has to carry to transmit the power from source to load.
Why are transformers used to increase the voltage before transmission?
Using a higher voltage reduces power losses during transmission.
What transmission?
A: It could mean two thing transmission as in broadcast radio TV and so forth or power transmission lines to supply real power to USA states
Why energy is lost from power transmission cables?
Losses are mainly due to electrical resistance.
