Since direct current does not involve oscillation, it decreases losses and allows electricity to be transmitted more efficiently. However, the cost of the substation equipment needed to convert DC electricity back to AC at both ends of the transmission line is expensive.
Is DC transmission more efficient?
Whenever power has to be transmitted over long distances, DC transmission is the most economical solution compared to high-voltage AC. HVDC transmission losses are quoted as less than 3% per 1,000 km, which are 30 to 40% less than with AC lines, at the same voltage levels.
Why is DC transmission economical?
High-voltage direct current (HVDC) technology offers several advantages compared to alternating current transmission systems. For example, it allows more efficient bulk power transfer over long distances.
Why DC is better than AC in transmission?
Hence, the voltage through transmission lines is very high, which reduces the current, which in turn minimizes the energy lost through transmission. This is why alternating current is preferred over direct current for transmitting electricity, as it is much cheaper to change the voltage of an alternating current.
Why is DC better for long distances?
DC is more efficient than AC of the same voltage, especially for long distances. Higher voltages are more efficient than lower voltages. It’s more costly to produce high voltage DC than AC, so it is only used for long distance lines.
Why DC is not used for transmission?
DC(Direct Current) is not used over AC(Alternating Current) in transmission because DC goes heavy attenuation while transmission over long distance as we do not transform it from Low Voltage (at which it is being generated) to High voltage (for transmission over long distance(I will explain…)) by some direct mean …
What is the advantage of DC?
Advantages of DC
A big advantage of direct current is that it is easier to change the speed of a DC electric motor than it is for an AC one. This is useful in many applications, such as electric and hybrid cars.
How far can DC power be transmitted?
As of 1980, the longest cost-effective distance for direct-current transmission was determined to be 7,000 kilometres (4,300 miles). For alternating current it was 4,000 kilometres (2,500 miles), though all transmission lines in use today are substantially shorter than this.
What are the advantages and disadvantages of DC transmission over AC transmission?
1) There is no inductance, capacitance, phase displacement and surge problem in DC transmission. 2) Due to the absence of inductance, the voltage drop in DC transmission is less than the AC transmission for the same load and receiving end voltage. Because of this DC transmission has better voltage regulation.
Why AC is dangerous than DC?
AC current is said to be more dangerous than DC current because the root mean squared value of AC is much more than its original value. … Our heart is driven by electric pulses; the high electric frequency of AC current can affect the frequency of the heart and can lead to a heart attack.
Is DC or AC more dangerous?
A.C. is said to be four to five times more dangerous than D.C. For one thing, A.C. causes more severe muscular contractions. … The frequency of the AC has a lot to do with the effect on the human body. Unfortunately, 60 cycles is in the most harmful range. At this frequency, as little as 25 volts can kill.
Why AC has less loss than DC?
It’s not that AC travels farther than DC; it’s that it can be transmitted with less loss. All transmission wires have a certain amount of resistance. When current flows through a resistance, it loses energy to heat, so the voltage on the far end (your home) is lower than at the near end (the power station).