Distribution networks are normally formed by interconnecting a number of ring shaped grids. Distribution transformers are then connected to the system by T-offs. Instead of specifying and selecting individual components required for a T-off, the required components are frequently available in an integrated package known as a ring-main unit (RMU).
Ring-main units normally consist of switches on both sides of the T-off, one to open the ring and another at the connection to the distribution transformer using one of the following:
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Ring Main Unit (RMU) 為中電壓及高電壓網絡分配時用既一種環形制櫃(供電俾變壓器“火牛”), 通常為 1 Loop-in, 1 Loop-out, 1 Feeder 或 2 Feeder (Tx), 常見電壓為12KV ~ 24KV
圖片參考：http://www.tamco.com.my/images/P_06.jpg
圖片參考：http://www.bikudo.com/photo_stock/212877.jpg
Distribution networks are normally formed by interconnecting a number of ring shaped grids. Distribution transformers are then connected to the system by T-offs. Instead of specifying and selecting individual components required for a T-off, the required components are frequently available in an integrated package known as a ring-main unit (RMU).
Ring-main units normally consist of switches on both sides of the T-off, one to open the ring and another at the connection to the distribution transformer using one of the following:
- Switch and a fuse separately
- Switch-fuse combination"
Source and further information:
http://www.kema.com/.../RMU.aspx
就好似我地低電壓13A插蘇環形電路一樣.
圖片參考：http://upload.wikimedia.org/wikipedia/commons/thum...
圖片參考：http://upload.wikimedia.org/wikipedia/commons/thum...
2009-12-07 23:30:28 補充：
其實 RMU 就好似 分離器 Isolator， 輸出有啲用保險絲有啲用 Vaccum Circuit Breaker (VCB) 或 SF6，全部都係中電壓值高電壓用既，請參考圖片
http://img4.imageshack.us/img4/6968/ringmain.png
通常有一個或兩個 OFF POINT, 當有任何一條電纜發生故障時，可以由另一條電纜供電，減少停電時間，至少要有兩個 H 牌(香港) B 牌(馬來西亞)註冊電工在現場至可以操作以上既設備。
2010-08-23 18:15:25 補充：
1 = AP + 1 = CP
2010-08-23 22:37:35 補充：
因爲高電壓屬於危險工作，有兩個人就係避免往往 [當局者迷] 情形之下做錯咗步驟
何博士
我想請問,點解要2個rew先操作得?係同一隻rmu要2個人定係其中一個要去另一隻掣到一同操作?我係h新丁.見過有人帶電落地.有無方法可以減少意外?
Ring Main Unit 通常都是 3 相嗎?