AC va DC avtomatlarini oʻzaro ishlatish mumkinmi?

Maydon: Трансформатор тahlili

China

Avvalo, bu masala tushuntirish kerak: DC kuchlari yo'llarida AC avtomatlarini DC avtomatlarni o'rniga qo'yish mumkin emas!

DC circuit breakers

AC va DC avtomatlarning ark yaratilishi va sondirilishi jarayonlari orasidagi farqlar sababli, bir xil reyting qiymatga ega bo'lgan AC va DC avtomatlari DC kuchini sondirishda birlashadigan imkoniyatlarga ega emas. AC avtomatlarni DC avtomatlarni o'rniga qo'yish yoki AC va DC avtomatlarni aralashtirish, himoya noto'g'riligining asosiy sabablari hisoblanadi va istalgan holda ustki yo'llarda avtomat ishga tushishi.

Avtomatlar tez ishga tushish uchun termo-magnit (elektromagnit) ishga tushish mekanizmini ishlatadi. Ishga tushishni ta'sirlovchi asosiy parametr - avtomat orqali o'tkazilayotgan maksimal strom. Avtomatning reyting qiymati OMS (o'rtacha kvadratik qiymat) qiymatiga mos keladi, lekin AC stromning maksimal qiymati uning OMS qiymatidan yuqori (takriban 1.4 marta). Bir xil sozlamada, agar DC kuch yo'llarida AC avtomat ishlatilsa, uning haqiqiy ishga tushish stromi DC avtomatdan yuqori bo'ladi. Yarmalanganlik paytda, lokal avtomat ishga tushmay, shuning uchun ustki avtomat ishga tushadi - bu "yuqori darajadagi ishga tushish" deb ataladi. Shuningdek, AC va DC avtomatlarning ark sondirish asoslarining farqlanishi sababli, DC ark AC arkka nisbatan sondirish jihatdan ancha qiyinroq. DC avtomatlari shuning uchun yuqori darajadagi ark sondirish talablari bilan ishlab chiqariladi. AC avtomatini DC kuch yo'llarida ishlatish DC arkni samarali yoki ishonchli tarzda sondira olmaydi, bu esa davra-davra asosiy kontaktlarning joylashishi ga olib keliadi.

Yuqorida keltirilganlar orqali, AC va DC avtomatlari aralashtirib ishlatish mumkin emasligi to'g'ri keladi. Qisqaroq aytganda, agar AC va DC avtomatlari haqiqatan universal bo'lsa, albatta ular orasidagi farqlar mavjud bo'lishi kerakmi?

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