# Which transmission is better AC or DC?

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Transmitting DC power over a long distance is inefficient. Thus AC supply is a far more efficient to transmit power. According to Siemens it’s quite the opposite: Whenever power has to be transmitted over long distances, DC transmission is the most economical solution compared to high-voltage AC.

## Is AC or DC better for long distance transmission?

High-voltage direct current (HVDC) technology offers several advantages compared to alternating current transmission systems. … “If the transmission line route is longer than about 300 miles, DC is a better option because AC lines have more line losses than DC for bulk power transfer.”

## What are the advantages of DC transmission system?

It requires only two conductors. There is no problem of inductance, capacitance and phase displacement which is common in ac transmission. For the same load and sending end voltage, the voltage drop in dc transmission lines is less than that in ac transmission.

## 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 problem with using DC current for a transmission line?

Wire diameter is limited for AC transmission lines due to the “skin effect” that prevents an AC current from penetrating to the center of a large wire, whereas a DC line can be arbitrarily thick. At 60 Hz, the skin effect becomes significant for wires greater in diameter than about an inch.

## 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.

## Why is AC preferred over DC?

AC voltage is preferred over DC voltage because it is economical and less complicated. AC voltage is more efficient than DC since minimum energy loss happens during transmission.

## 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.