rack-out VCB (contoh)
Saya menerima email dari seorang chargeman A1 yang bertanyakan tentang VCB. Beliau menyatakan bahawa di empat kerja beliau, tiada VCB dan beliau mahu belajar tentangnya.
Jawapan saya, belajar teori adalah berbeza dengan kemahiran mengendalikan perkakasuis. Chargeman lebih kepada "hands-on" dan pemerhatian dari Chargeman yang lebih tinggi adalah penting. Malah, taiada pensuisan dibenarkan jika tidak mendapat kebenaran dan seliaan orang kompeten. Apatahlagi, Chargeman A1 adalah untuk voltan rendah tanpa substation. InsyaAllah, saya juga berhasrat mengadakan kelas kekompetenan setelah selesai berbincang dengan teman-teman pengajar dari Institut kemahiran. Di kelas tersebut, penerangan akan lebih menyeluruh dan spesifik.
Walaubagaimanapun, saya petik penerangan ringkas dari wisegeek.com yang mencerita perihal VCB buat tatapan semua:
In a vacuum circuit breaker, two electrical contacts are enclosed in a vacuum. One of the contacts is fixed, and one of the contacts is movable. When the circuit breaker detects a dangerous situation, the movable contact pulls away from the fixed contact, interrupting the current. Because the contacts are in a vacuum, arcing between the contacts is suppressed, ensuring that the circuit remains open. As long as the circuit is open, it will not be energized.
Vacuum reclosers will automatically reset when conditions are safe again, closing the circuit and allowing electricity to flow through it. Reclosers can usually go through several cycles before they will need to be manually reset. Other types of vacuum circuit breakers require resetting every time the breaker trips. Before a manual reset, the person doing the resetting needs to check the system to determine what caused the unsafe conditions in the first place, and make sure that they have been addressed.
Vacuum circuit breakers are very durable, and they are designed to last for an extended period of time. These electrical safety devices can be made with a variety of materials, depending on the need and the preference of the manufacturer. As with other devices used to interrupt current for safety, vacuum circuit breakers are given a rating which indicates the kind of conditions they can handle. When people install circuit breakers, they must confirm that the breaker they are using is suitable for the conditions; a breaker which is rated too low can fail catastrophically.
Ada juga yang bertanya, contact sesentuh VCB dibuat dari material apa? Jawapannya; Chromium Copper. Saya terlupa rujukannya tetapi akan saya pautkan jika berkesempatan. insyaAllah.
