產品概述 Product overview

XL-21 型低壓動力配電柜適用于發電廠及工礦企業中，在交流電壓 500 伏及以下的三相四線或三相五線系統作動力配電之用。XL-21 型低壓動力配電箱系戶內裝置靠墻安裝，屏前檢修。 

XL-21 low-voltage power distribution cabinet is suitable for power distribution in power plants and industrial and mining enterprises in three-phase four-wire or tn-s systems with AC voltage of 500 volts or less. XL-21 type low voltage power distribution box is installed against the wall and overhauled in front of the screen.

結構特點 Design feature

XL-21 型低壓動力配電柜系封閉式，外殼用鋼板彎制而成，刀開關操作手柄裝于箱前右柱上部，可以作為切換電源之用。配電箱前面裝有一只電壓表，指示母線的電壓。配電箱前面有門，門打開后，配電箱內全部設備敞露、便于檢修維護。本配電箱均采用國內自行設計的型組件，具有結構緊湊，檢修方便，線路方案可以靈活組合等特點。配電箱除裝有空氣斷路器和熔斷器作為短路保護外，還裝有接觸器和熱繼電器，箱前門可裝操作按鈕和指示燈。 

XL-21 type low voltage power distribution cabinet is enclosed and its shell is made of bent steel plate. The knife switch operating handle is installed on the upper part of the right column in front of the cabinet and can be used for switching power supply. A voltmeter is installed in front of the distribution box to indicate the voltage of the bus. There is a door in front of the distribution box. After the door is opened, all equipment in the distribution box will be exposed for easy maintenance. This distribution box adopts domestic self-designed components, featuring compact structure, 

convenient maintenance and flexible combination of circuit schemes. The distribution box is equipped with air switch and fuse as short-circuit protection, contactor and thermal relay. The front door of the box can be equipped with operation buttons and indicator lights.

正常使用環境 Normal operating environment

◇ 環境溫度：-50℃ ~+40℃，且 24h 內的平均溫度不超過 +36℃； 

◇海拔高度：不超過 2000m； 

◇相對濕度：在周圍空氣濕度為 +40℃時不超過 50%； 

在較低濕度下可以有較高的相對濕度 ( 如：+20℃時為 90%)，考慮 到溫度的變化允許產生適度的凝霜： 

◇設備安裝時與垂直面的傾斜度應不超過 5°，設備應安裝在無劇烈震動、無沖擊及無腐蝕的場所。 

◇ Ambient temperature: -50℃ ~+40℃ , and the average temperature within 24 hours shall not exceed+36℃ ; 

◇ Altitude: no more than 2000 m; 

◇ Relative humidity: not more than 50% when ambient air humidity is +40℃ ; 

Under lower humidity, it can have higher relative humidity (e.g.: +20℃ is 90%). Considering the change of temperature, it is allowed to produce moderate frost: 

◇ The inclination of the equipment to the vertical plane shall not exceed 5 during installation, and the equipment shall be installed in a place free from severe vibration, impact and corrosion.

使用、維護和檢修 Use, maintenance and overhaul

動力配電箱在安裝或檢修后，在投入運行前須進行下列各項檢查與試驗 ( 檢修后的檢查與試驗，視其檢修質性而定 )。 

◇ 檢查動力配電柜內部裝設電器設備和二次接線是否符合圖紙要求。 

◇ 檢查用于操作的刀開關、空氣開關是否靈活，應無卡軋型象。 

◇ 檢查所裝設的電器設備的接觸是否良好，是否符合該電器設備的本身使用要求。 

◇ 檢查動力配電柜內部有無其他異物及各部分堅固螺釘是否有松動現象。 

After the power distribution box is installed or overhauled, the following inspections and tests shall be carried out before it is put into operation (the inspections and tests after overhaul depend on the quality of overhaul). 

◇ Check whether the electrical equipment and secondary wiring installed inside the power distribution cabinet meet the drawing requirements. 

◇ Check whether the knife switch and air switch used for operation are flexible, and there should be no sticking and rolling pattern. 

◇ Check whether the electrical equipment installed has good contact and meets the use requirements of the electrical equipment itself. 

◇ Check whether there are any other foreign matters in the power distribution cabinet and whether the strong screws in each part are loose.