0
Why are transmission voltages in ac systems generally higher than those in dc systems?
The main advantage of using ac is that you can step up and step down the voltage by means of a transformer,since transformer works only with ac.
another thing is that if dc power is used for transmission,then the power loss associated with t will demand the use of transmission lines which are very thick(have a larger cross section)..for long distance transmission this may lead to the requirement of power lines with impractical dimensions.
What else can I help you with?
What is the role of power transformers in power systems?
Power transformers are used in electricity transmission and primary-distribution systems. They are used to increase (step up) the voltage supplied by generators at power stations to the extremely-high voltages necessary for electricity transmission and, at bulk power centres, to incrementally reduce (step down) those voltages to lower levels.Transmission is only possible at high voltages because, for a given load, the higher the voltage the lower the resulting load current. Reduction in load current results in manageable voltage drops along the line, conductors of practical size/weight, and minimises the line losses.
Why do high tension transmission wires carry electricity at high voltages?
For a given load, the higher the supply voltage, the lower the resulting load current. So, using high voltages reduce the load current which, in turn:minimise voltage drop along the line (which, at low voltages, would otherwise be enormous, rendering transmission of energy impossible).enable conductors of practical size.reduce line losses.
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.
What type of transformer is needed before the electricity from the Power Station is sent into the National Grid?
From the Generator station, the voltage is sent to a step up transformer. Transmission at higher voltages is used to over come line loss over the miles of transmission.
Why the graph of breakdown voltage is cheaper than knee voltage?
Break down voltages happens at low voltages (.6 for silicon & .3 for germanium), whereas knee voltages at higher voltages. That's why its cheaper.
How are lower voltages combined into higher voltages for transmission?
Low voltages are not 'combined into higher voltages' for transmission! The lower voltage (e.g. the voltage generated at a power station) is applied to the primary winding of a large power transformer, and the required higher transmission voltage then appears across the transformer's secondary winding. The magnitude of the secondary voltage is determined by the turns ratio of the transformer's windings.
Is AC better than DC in terms of electrical power transmission efficiency?
AC is generally more efficient than DC for long-distance electrical power transmission because it can be easily converted to higher voltages, reducing energy losses during transmission.
Is AC or DC safer for electrical systems?
AC (alternating current) is generally considered safer for electrical systems because it is easier to control and can be easily converted to lower voltages. DC (direct current) can be more dangerous at higher voltages and is more likely to cause muscle contractions and other serious injuries.
Why is ac electricity transformed?
'Transform' means to increase or to decrease an a.c. voltage. Transformers are used to step up lower voltages to higher voltages, or vice-versa. Transformers are an essential component of electricity transmission and distribution systems, as they allow voltage levels to be changed very efficiently. For a given load, the higher the supply voltage, the lower the resulting load current. So very high voltages are necessary in transmission systems in order to transfer energy with relatively-low values of current -this leads to less voltage drops along the line, less energy losses, etc. Transformers are required to increase voltages for transmission at generating stations, and to reduce voltages for the users at the far end of the transmission/distribution lines. A.C. is actually less-efficient than d.c. for long transmission lines, but is more widely used because it is very complicated to transform d.c. voltage levels, because transformers do not work with d.c.
Can you generate 250 to 300 volts of eletricity for the house using solar panels?
Yes- however, most systems STORE lower voltages (6, 12, or 36 volts) and convert it to higher voltages as needed.
Why there is no electricity generation at 500 kv?
Electrical generation at higher voltages would have to have higher insulation between the windings of the generator. This would become physically impossible as the size of the generator would become so large that is would become inefficient. Voltages are generated at lower voltages where the insulation factor between windings is much lower. This low voltage is then transformed into a higher voltage for transmission to other locals.
Why are a range of voltages used?
Several reasons for different voltages. At the heart of it is that to deliver the same power, voltage and current are inversely related. The other aspect is safety. So for the grid, high voltages are used to maximize power transmission within the current limits of the cables. In industrial environments, equipment may require a lot of power - that requires high voltages as well Domestic requirements are not so power-hungry so 120 or 240 volts are adequate, and are also safer (well... less dangerous) than higher voltages.
What is the role of power transformers in power systems?
Power transformers are used in electricity transmission and primary-distribution systems. They are used to increase (step up) the voltage supplied by generators at power stations to the extremely-high voltages necessary for electricity transmission and, at bulk power centres, to incrementally reduce (step down) those voltages to lower levels.Transmission is only possible at high voltages because, for a given load, the higher the voltage the lower the resulting load current. Reduction in load current results in manageable voltage drops along the line, conductors of practical size/weight, and minimises the line losses.
Why do high tension transmission wires carry electricity at high voltages?
For a given load, the higher the supply voltage, the lower the resulting load current. So, using high voltages reduce the load current which, in turn:minimise voltage drop along the line (which, at low voltages, would otherwise be enormous, rendering transmission of energy impossible).enable conductors of practical size.reduce line losses.
When electricity travels long distances it is better to have it at higher voltages?
when transmission we usually use high voltages becoz at higher voltages current is less(p=vi,voltage is inversly proportional to current at constant power) so that we can minimize copper losses i2R losses.
Why are transformers used for transmission of electricity into your home?
The voltage provided by power company are higher what your home uses so transformers step down the voltage for your house. Higher voltages in your home would cause a potential safety hazard. The higher voltages on transmission lines are used to cope with voltage drops over long distances.
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.
