What is the difference between DC arc and AC arc?

What is the difference between DC Arc and AC Arc?

Recently, we received a message from some friends in the background asking about the difference between the DC arc and the AC arc. We believe that this is a common problem, and it is worth raising it separately for everyone to answer.  

The DC electric arc furnace has only one electrode, the negative electrode and the positive electrode. Its power supply system is different from that of the AC arc furnace.

(Alternating current arc) An arcing discharge between an analysis gap using alternating current. According to the voltage level, it is divided into high-voltage AC arc and low-voltage AC arc.

The former has a working voltage of 2~4kV, which can be used for direct arc ignition. The device is complicated and the operation is dangerous, so it is rarely used. Qualitative and quantitative analysis of trace elements in various materials, and quantitative analysis of low-content elements in metals and alloys.

  

Generally speaking, the voltage fluctuation and flicker produced by the DC electric arc furnace is half of that of the AC electric arc furnace of the same capacity. Compared with the traditional AC electric arc furnace, the main features of the DC electric arc furnace are:

(1) The DC arc does not pass through the zero point, and there is no periodic ignition and extinguishing phenomenon, so the arc is stable.  

(2) The current and voltage fluctuations are relatively small, the impact on the power grid is reduced, and the cable life is prolonged; 

(3) The electrode loss is less, 50% less than that of the AC electric arc furnace. However, it has been limited to the DC power supply that cannot obtain high power, which has also caused it to fail to develop by leaps and bounds.

Hani Tech is a Hot Rolling Mill manufacturing company working mainly in the area of the bar and wire rod mills, high-speed wire rod mills, high-speed rebar rolling mills, TMT rolling mills, flying shear, cold strip rolling mills, reheating furnaces, induction furnaces, intermediate frequency furnace, electric arc furnace, ladle refining furnace, blast furnace, continuous casting machine. 

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