1. The fixed partition low-voltage cabinet is equipped with plug-in switches, which are installed in an independent fixed partition small room. The switch plug-in structure separates the main body and the base. The base is fixed to the base plate, and the reverse side is convenient for connecting cables. The switch body can be unplugged with electricity for easy maintenance or replacement. This structure is suitable for the power supply output of the transformer rear panel. The contact surface between the molded case switch body and the base is large, with stable clamping and reliable contact. There is independent space for the switch, busbar, primary cable, and secondary wiring, with good ventilation and heat dissipation. The device wiring, protection, and maintenance are safe and convenient.

2、抽屜柜便是把開關、接觸器熱繼電器等元器件會集在一個抽屜單元里，該型式的長處是可以把很多元器件一次抽出，便于整體快速替換，一般用于多回路、小容量場合，例如MCC柜，會集照明操控等；但它因為選用了抽屜接插件，導軌的誤差及在背后的插件不可目視，往往形成接觸不良，特別容量較大（例如開關容量大于100A）場合，往往形成接觸點發(fā)熱乃焚毀的結果。

2. A drawer cabinet is a type of drawer unit that gathers switches, contactors, thermal relays, and other components together. The advantage of this type is that it can extract many components at once, making it easy to replace them quickly as a whole. It is generally used in multi circuit and small capacity situations, such as MCC cabinets, centralized lighting control, etc; However, due to the use of drawer connectors, the errors in the guide rails and the insertions behind them are not visible, often resulting in poor contact, especially in situations with large capacities (such as switch capacities greater than 100A), which often result in contact point heating or even burning.

3、數(shù)據(jù)中心用戶的低壓柜饋電輸出，一般都沒有接觸器熱繼電器等元器件，根本不需求用抽屜結構型式，且大多為250A塑殼開關，選用抽屜柜不只有風險（需求長時間運轉及屢次抽出后才能反映出來），而且熱量散發(fā)、裝置接線、保護保養(yǎng)等也不便利。二次接線端和一次電纜接線柱在同一個空間，多功能丈量外表等數(shù)據(jù)傳輸線敷設也會受到強電的干涉，牢靠性較固定分隔式有所下降。因為增加了抽屜結構，經(jīng)濟性也較固定分隔式略差

3. The low-voltage cabinet feed output of data center users generally does not have components such as contactors and thermal relays, and there is no need to use drawer structure. Most of them are 250A molded case switches. Choosing a drawer cabinet not only poses safety risks (it requires long-term operation and repeated extraction before it can be reflected), but also inconvenient for heat dissipation, device wiring, protection and maintenance. The secondary terminal and the primary cable terminal are located in the same space, and the laying of data transmission lines such as multifunctional measurement surfaces will also be affected by strong electrical interference, resulting in a decrease in reliability compared to fixed and separated types. Due to the addition of a drawer structure, the economy is slightly worse than that of a fixed partition type

4、數(shù)據(jù)中心的負載相對比較穩(wěn)定，為了供給數(shù)據(jù)中心功率，一般都是滿負荷匹配。據(jù)悉，不少數(shù)據(jù)中心在運轉中發(fā)現(xiàn)了有抽屜柜熱量不容易散發(fā)的問題，運維人員為了下降熱量，選用了打開柜門、用風扇強制冷卻的被動手法，乃調(diào)整削減輸出回路，下降數(shù)據(jù)中心功率。我認為這個都和建造階段選用抽屜柜有關，后續(xù)的補救都是無奈之舉。

4. The load of the data center is relatively stable, and in order to supply power to the data center, it is generally matched at full load. It is reported that many data centers have discovered the problem of drawer cabinets not easily emitting heat during operation. In order to reduce heat, operation and maintenance personnel have chosen passive methods such as opening cabinet doors, using fans to force cooling, and even adjusting and reducing output circuits to reduce data center power. I think this is all related to the selection of drawer cabinets during the construction phase, and subsequent remedial actions are helpless.