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Why is electricity transmittedat very high voltages and then stepped down by transformers?
Wiki User
∙ 11y ago
The higher the transmission voltage the lower the I2r line losses. Greater effiency.
AnswerThe voltage produced by power station generators is limited to 25 - 30 kV because of there is a limit to how physically-large a generator's windings can be. However, to transmit energy, the transmission voltages must be very high because, for any given load, the higher the voltage, the lower the load current. This means that (1) voltage drops along the line are manageable, (2) conductors of practical size can be used, and (3) line losses are minimised.
Wiki User
∙ 11y ago
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Why do people use alternating current in your nomes today?
The use of alternating current permits voltages to be altered via transformers, so for efficiency the voltage at the generator can be stepped up for transmission to reduce losses and cost, then stepped down again at the user's end to whatever voltage is needed. For safety reasons homes use a lower voltage than does industry. Multi-phases can be used to give more than one voltage from the same supply without transformers.
Where are high voltage transformers use?
To answer this correctly, we must first ask what is "High Voltage". This can vary quite a bit in electrical engineering. If you are working on a circuit board, then "High Voltage" might be above 50 volts. These would be transformers used in circuit board power supplies. If you are working in Industrial Environment, then you might consider "High Voltage" to be 230 Volts and above. If you are working on power distribution in a facility, then it might be above 15,000 volts. If you are dealing with power transmission withing towns, or between cities, then it might be several hundred thousand volts.Now, to the answer. If you read the above correctly, you will find the answer for each level.AnswerThe electrical regulations in your country will define what is meant by 'high voltage'; for example, in the UK, 'high voltage' is clearly defined as being 'voltages exceeding 600 V a.c.' So a high-voltage transformer is one whose either winding is rated above 600 V.So, high-voltage transformers are either 'power transformers' (transformers used in the electricity transmission system) or 'distribution transformers' (transformers used in the electricity distribution system).Power tranformers may be 'step-up' or 'step-down', and are essential components in the electricity system, which can only work at very high voltages (in the UK, 400 or 275 kV). Distribution transformers are 'step-down' transformers -in the UK, for example, 11 kV is stepped down to 400/230 V for distribution to residences or commercial premises.
Is voltage in a home about 70 percent of the peak voltage that is generated?
A modern power grid consists of many voltages and currents, all being interconnected by transformers, which trade off voltage and current. A typical power generator usually generates electricity at a few thousand volts AC, which is then stepped up to around 120kv for distribution, then stepped down to around 30kv, for secondary distribution, then finally down to 240v/120v for domestic use. Engineers typically measure the voltage of AC circuits using "RMS voltages" (Root Mean Squared voltages) This convention is used because of the varying nature of AC, and relates the varying AC voltage to an effective DC voltage. RMS Voltage for typical AC =Peak voltage / Square root(2) which is approximately equal to peak voltage* 70%
What happens at substations?
At substations, the voltage of electricity is either stepped up or stepped down depending on its application. They serve as an intermediate point between the power generation plants and the consumers' electrical distribution system. Substations also provide various protection and control mechanisms to ensure the reliable and efficient transmission and distribution of electricity.
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).
Does the ac generator produce the 11kv or we get the 11kv via step up transformer?
I've seen AC generators that have output voltages from 120v to near 30kV. Likely you get your electricity from a large generator, that is connected to a step up transformer (few kV - 30kV stepped up to transmission voltage levels of 100kV - 750kV), which transmits the power through the bulk electric system, then down through step down transformers, through subT and distribution networks to your home.
If step up transformers can change 1 voltage to a higher 1 why they just have 1 power plant and a load of transformers powering the entire planet?
Because having a higher voltage does not mean you have more power. After electricity is generated at a power plant, it is 'stepped-up' to a very high voltage b4 being transmissioned thru power lines. When voltage goes up, current or amperage goes down. This is crucial, for as you would lose just about everything u generated to heat. Once it gets to a neighborhood, it gets stepped down at a 'substation'. The electricity is stepped down again at the street pole where it then enters your house. When u step it down, the amperage goes back up. Current is what is used to run your appliances and such, not voltage.
Where in the is the step transformer in the national grid?
Step up transformers are used to boost the voltage up for long distance transmission. At the other end, step down transformer are used to bring the voltage back to a working voltage for distribution to homes and industries
Who experimented with alternating currents of electricity?
In alternating current the flow of electric charge periodically reverses direction. Nikola Tesla was an inventor, mechanical engineer, and electrical engineer. Tesla devised a better system for electrical transmission - the AC system that we use in our homes today. AC offered great advantages over the DC system. By using Tesla's newly developed transformers, AC voltages could be stepped up and transmitted over long distances through thin wires.
Why the generation of electrical energy is AC?
Electrical energy is usually AC, because AC can be stepped up to higher voltages with a transformer for transmission over smaller wires, and then stepped back down to serviceble levels with another transformer.
Why electricity not directly transmitted to residential or industrial use directly from power plant?
The main reason is that the voltage that the generator produces is not compatible with the residential and commercial voltages. The voltage generated could be in the range of 3.3, 6.6 and 11 kV. The consumer needs voltages in the range of 120/240, 120/208, 277/480 and 347/600. The second reason is that where the power is generated is usually miles from any urban areas where it is needed. From the generated voltage is it stepped up, with the use of transformers, to a much higher voltage in the range of 50 to 250 kV. The higher the transmitted voltage, the less voltage drop along the transmission lines. Once the voltage gets to the area that it will be used it is dropped back down, again with transformers, to the utility company's working voltage. This is the voltage that you use in residential, commercial and industrial applications.
Does static electricity give light to your house?
No, static electricity does not light your home. Electric power plants send electricity to your house via the power grid, all of which works on an alternating current or AC. At the generating plant, this alternating current is stepped up to high voltages to distribute it, and it is then stepped down on the delivery end. The electricity is distributed to everyone on the power grid, and your house applies the AC to power up the lights and the electrical appliances.Static electricity, which is generated in tiny amounts around us all the time, is not a "stable" or "reliable" source of power. We haven't yet been successful in harnessing lightning, the most powerful of earth's static electric sources, to apply it to useful purposes on anything buy an experimental scale. We don't use static electricity for residential purposes.
