Ikkita imkoniyat mavjud: bo'shashgan terminal tufayli kontaktning qarshiligi juda katta, bu esa qizib ketishiga olib keladi; terminal bo'shashgan emas, lekin halqa -oqimdan oshib ketgan va noma'lum sabablarga ko'ra qizib ketgan, masalan, quvvat manbai kuchlanishi juda yuqori yoki yuk qisqa-tulangan.
1. Voltaj juda yuqori. Bu manbadan tekshirilishi mumkin, transformatorning ikkilamchi kuchlanishi - taqsimlash qutisidagi kuchlanish - har bir elektr jihozlarining kuchlanishi.
2. Tuproq yoriqlari. U transformatordan ham tekshirilishi mumkin, keyin esa tarqatish qutisiga erga ulanadi. Tuproqqa ulangan yerga ulangan bo'lishi kerak va oddiy faza chizig'ini tuproqli yoriqdan chiqarib tashlash kerak. Quvvat o'chirilganda o'lchash uchun siz izolyatsiya o'lchagich yoki shakerdan foydalanishingiz mumkin va bo'limlarda o'lchashingiz mumkin. Bo'limlarda faqat kabellar, simlar, o'chirgichlar, kalitlar va boshqalar kabi elektr ta'minoti va tarqatish liniyalarini o'lchashga harakat qiling. Sensor qurilmalar uchun sigortalar.
The key to grounding is that the grounding resistance should be low and the contact area should be large. The former can ensure that the grounding point has a "zero potential" as low as possible close to the ground potential, which can avoid the possibility that the lightning will "reverse" from the grounding wire and enter the power supply circuit after a thunderstorm. The latter can ensure that there is sufficient capacity to provide a fault current path, including lightning or short-circuit faults, etc. Because the actual construction process has theoretically changed according to the changes of contemporary technology and technology, whether this grounding method is feasible or not depends on how the new standard specification is stipulated.
