Cách bảo vệ xung sét và sung chuyển mạch cho hệ thống đen led

Xung Sét

Là hiện tượng phóng điện từ mây xuống mặt đất hay ngược lại từ mặt đất lên mây. Có nhiều loại sét như sét khô, sét hòn, sét tên lửa, sét dương…

  • Xung sét từ mây xuống mặt đất: là loại phổ biến nhất đe dọa đến tính mạng, tài sản nhiều nhất vì chúng đánh thẳng xuống đất.
  • Xung sét ngược từ đất lên mây là các đám mây mang điện tích (-) và mặt đất mang Ion dương và sét đánh tại điểm cao nhất trên mặt đất.

xung sét

Điện áp được xác định theo biểu thức :

  • u= I × ρ ⁄ 2Id
  • u: điện thế
  • I: dòng xung sét
  • ρ: điện trở xuất
  • d:  khoảng cách đén điểm sét đánh

Xung chuyển mạch

  • Khi có dòng điện chạy qua cuộn dây, trong cuộn dây tích lũy năng lượng w=(Li²)/2  khi cắt tải đột ngột, năng lượng này đột ngột về 0. Nguồn năng lượng đã tích lũy này trả ngược lại lên đường dây và gây quá áp trên đường dây tại thời điểm cắt tải.
  • Chúng ta sẽ thường thấy các thiết bị gây quá áp như may hàn điện, máy CNC, máy dập…

Trong một số loại đèn hay trong đèn cao áp khi tắt sẽ gây quá áp.

xung chuyển mạch

Bảo vệ xung sét và xung chuyển mạch

  • Để bảo bảo vệ thiết bị trước xung sét và xung chuyển mạch người ta sử dụng các mạch điện có các linh kiện chuyên dùng để cắt sét cũng như cắt xung nhiễu.
  • Các linh kiện thường thấy là Varistor SPV.
  • Tụ điện chống sét hay trở chống sét ⇒ Trong điều kiện điện trở của các linh kiện rất cao, khi điện áp bị đẩy lên cao hơn thông số kỹ thuật khi đó ngay lập tức điện trở được đẩy xuống mức thấp, chức năng này dùng để bảo vệ linh kiện điện tử khỏi sự tăng cao của điện áp.

bảo vệ hệ thống đèn led

Các Varistor SPV có các đặc tính sau:

  • Điện áp kẹp – điện áp tối đa mà nó có thể chặn
  • Hấp thụ và tản năng lượng
  • Thời gian đáp ứng: Càng nhanh càng tốt
  • Tỳ loại mà SPV có thể chịu được số lần chịu xung 1.000 lần → 3.000 lần → 5.000 lần

Bảo vệ Xung Sét cho thiết bị

Thông thường người ta bảo vệ chống sét thành nhiều cấp và nhiều tầng, người ta hay dùng SPV cho driver.

Đèn led Srigel chất lượng cao

Srigel nhà sản xuất đèn led chất lượng cao với nhiều mẫu đèn đẹp mắt và tuổi thọ đèn tốt nhất trên thị trường hiện nay. Khách hàng khi mua đèn led Srigel có thể yên tâm về chất lượng sản phẩm cũng như chế độ bảo hành sửa chữa của chúng tôi. Cam đoan Srigel sẽ làm hài lòng quý khách hàng.

đè led Srigel chất lượng cao

Khách hàng liên hệ mua đèn led Srigel theo địa chỉ sau:

  • Hotline: 0911 400 770
  • Email: srigel.com.vn@gmail.com
  • Website: https://srigel.com.vn/
  • Địa chỉ: Số 526 – 528 Xô Viết Nghệ Tĩnh, P. 25, Q. Bình Thạnh

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