Me kadan da ake magana a kan Arc Extinction Circuit Breaker?

Idan lokacin da jirgin hanyar na biyu ta circuit breaker zai gama, zai faru arc wanda ya taka wani lokaci mai yawa bayan gudummawa. Wannan arc ya fi dace saboda hoton energy da yake samu, wanda zai iya haɗa da kisan abinci.

Circuit breaker ya kamata ci gaba ta arc baki ɗaya ba ta yi lalace zuwa aiki ko mutane. Arc ya haɗa da matsayin muhimmanci ga takara. Ci gaba ta DC arc ya fi ƙarfi da yake da AC arc. A cikin AC arc, karamin ya taka zero har zuwa kowace tsarin waveform, wanda ke shafi arc a taka wani lokaci mai yawa. Wannan zero-crossing ya ba ƙoƙari wajen ake soke ci gaban arc, ta amfani da wani lokaci mai yawa da aka fito don deionize ita da ake kare ƙaro.

Conductance ta arc ana nuna kan electron density (ions per cubic centimeter), kwadrafin diameter da arc, da kuma inverse da length ta arc. Don ci gaban arc, ya kamata a kawo electron density (ionization) da kuma kusa da arc diameter, sannan a kara arc length.

Haddadi na Ci Gaban Arc

Aka da biyar haddadin mafi muhimmanci don ci gaban arc a cikin circuit breakers:

High Resistance Method

• Sana'a: Effective resistance ta arc za a kara lokacin, kawai karamin ya taka low level inda hoton energy ba zai iya sauka arc, wanda ke jan ci gaban arc.

• Energy Dissipation: Saboda nature ta arc da ya fi resistance, akwai karamin system energy za a fito a cikin circuit breaker, wanda ya fi haske.

• Takardun Da Za Su Kafa Resistance ta Arc:

• Cooling: Ya kawo ion mobility da electron density.

• Arc Lengthening: Separating contacts ya kara path length, wanda ke kara resistance.

• Cross-Section Reduction: Narrowing diameter ta arc ya kawo conductance.

• Arc Splitting: Dividing arc a smaller segments (e.g., via metal grids or chutes) ya kara total resistance.

Low Resistance (Zero Current Interruption) Method

• Applicability: Exclusive to AC circuits, leveraging the natural current zero-crossings (100 times per second for 50 Hz systems).

• Mechanism:

• Arc resistance ya ci ƙanan low levels har zuwa karamin ya taka zero.

• A cikin zero-crossing, arc ya ci gaba ɗaya. Dielectric strength ya aiki har zuwa contacts don ake soke restriking, ta amfani da wani lokaci mai yawa da aka fito don deionize ita.

• Advantage: Minimize energy dissipation a cikin breaker ta amfani da zero points na AC waveform, wanda ke jan ita da ƙarfin ci gaban arc.