Why is the charger plugged into the power supply sparking?
2022-12-13 Views：34
Users who travel around the office with power adapters often notice that the charger inserted into an energized outlet instantly, there will often be electrical sparks generated, a time to panic, worrying whether it will damage the outlet or adapter. Today, BON to introduce this phenomenon and the actual test whether there will be damage.
Arcing (arc) phenomenon
Charger plugged into the socket of a moment to produce a spark of electricity, is called the arcing phenomenon. Arcing belongs to a form of gas discharge, gas discharge is divided into self-sustaining discharge and non-self-sustaining discharge two categories, arcing belongs to the gas self-sustaining discharge in the arc discharge.
Test proves that when opening or closing in the atmosphere with a voltage of more than 10V, the current exceeds 0.5A circuit, the contact gap (or arc gap) will produce a cloud of extremely high temperature, brightness and conductive gas, known as the arc. For electrical appliances with contacts, as the arc is mainly generated when the contacts pass / break the circuit, the high temperature will burn the contacts and insulation, and in serious cases even cause a phase short circuit, electrical explosion, resulting in fire, endangering the safety of personnel and equipment.
As we all know, the power adapter uses the national standard alloy plug, through the socket metal shrapnel and the utility connection, when the plug touches the metal shrapnel in the socket, it will touch the instant contact area is small, the current flows instantly through the relationship, there may be a tiny spark. Secondly, the high temperature generated by the arc will make the contact surface melt and vaporize, burning the insulation material. For the use of older or substandard production of the plug board or charger, often see the connection port or metal pins with scorching traces, and can easily cause flying arc short circuit and injury accidents.
Because the high temperature generated by the arc can reach more than 3000 ℃, under certain conditions, between the two electrodes can produce a strong and lasting gas discharge phenomenon, can make the metal surface melting and vaporization, so life is more common in mechanical repair stores, by generating an electric arc for welding; in addition, also used in the metallurgical industry, such as DC electric arc furnace.
Overall, the power adapter inserted into the energized plug board, due to the contact area is too small, through the voltage and current is larger resulting in arc generation, the user sees is a little spark; on the other hand, due to the market regular qualified charger internal production process of maturation, and has a number of over-current over-voltage protection technology, the user does not have to worry too much about accidents. In addition, due to the high temperature and bright light of the arc, it can be widely used in welding, melting, chemical synthesis, strong light sources and space technology. Life's phenomena seem to be scientifically explainable, only attentive observation, will certainly like this world full of many unknown.
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