The maintenance of low-voltage distribution cabinets mainly aims to ensure their normal and safe operation. Annual general physical examination and maintenance of low-voltage distribution cabinets are required. To complete maintenance with a shorter outage time, the owner's outage time is generally determined in advance.

低壓配電柜的保養的內容及步驟：

The maintenance content and steps of low-voltage distribution cabinets:

1：檢修時應從變壓器低壓側開始。配電柜斷電后，清潔柜中灰塵，檢查母線及引下線連接是否良好，接頭點有無發熱變色，檢查電纜頭、接線樁頭是否牢固可靠，檢查接地線有無銹蝕，接線樁頭是否緊固。所有二次回路接線連接可靠，絕緣符合要求。

1: Maintenance should start from the low-voltage side of the transformer. After the power is cut off in the distribution cabinet, clean the dust inside the cabinet, check whether the busbar and down lead connections are good, whether the joint points have heat or discoloration, check whether the cable head and wiring pile head are firm and reliable, check whether the grounding wire is rusted, and whether the wiring pile head is tight. All secondary circuit wiring connections are reliable and the insulation meets the requirements.

2： 檢查抽屜式開關時，抽屜式開關柜在推入或拉出時應靈活，機械閉鎖可靠。檢查抽屜柜上的自動空氣開關操作機構是否到位，接線螺絲是否緊固。接觸器觸頭表面及四周的污物，檢查接觸器觸頭接觸是否完好，如觸頭接觸不良，必要時可稍微修銼觸頭表面，如觸頭嚴重燒蝕（觸頭點磨損原厚度的1/3）即應更換觸頭。電源指示儀表、指示燈完好。

2: When checking the drawer type switch, the drawer type switch cabinet should be flexible when pushed in or pulled out, and the mechanical locking should be reliable. Check if the automatic air switch operating mechanism on the drawer cabinet is in place and if the wiring screws are tightened. Clean the dirt on the surface and surroundings of the contactor contact, check if the contact is intact. If the contact is poor, slightly file the contact surface if necessary. If the contact is severely burned (the contact point is worn to 1/3 of the original thickness), the contact should be replaced. The power indicator instrument and indicator light are intact.

3：檢修電容柜時，應先斷開電容柜總開關，用10mm2以上的一根導線逐個把電容器對地進行放電后，外觀檢查殼體良好，無滲漏油現象，若電容器外殼膨脹，應及時處理，更換放電裝置、控制電路的接線螺絲及接地裝置。合閘后進行指示部分及自動補償部分的調試。

3: When repairing the capacitor cabinet, the main switch of the capacitor cabinet should be disconnected first, and the capacitors should be discharged to the ground one by one with a wire of 10mm2 or more. The appearance of the shell should be checked and there should be no oil leakage. If the capacitor shell expands, it should be dealt with in a timely manner, and the discharge device, control circuit wiring screws, and grounding device should be replaced. After closing, debug the indication part and automatic compensation part.

4：受電柜及聯絡柜中的斷路器檢修：先斷開所有負荷后，用手柄搖出斷路器。重新緊固接線螺絲，檢查刀口的彈力是否符合規定。滅弧柵有否破裂或損壞，手動調試機械聯鎖分合閘是否準確，檢查觸頭接觸是否良好，必要時修銼觸頭表面，檢查內部彈簧、墊片、螺絲有無松動、變形和脫落。

4: Maintenance of circuit breakers in the receiving cabinet and contact cabinet: First disconnect all loads, and then use the handle to shake out the circuit breaker. Retighten the wiring screws and check if the elasticity of the blade meets the regulations. Check if the arc extinguishing grid is broken or damaged, manually adjust the mechanical interlocking opening and closing to ensure accuracy, check if the contact is in good condition, if necessary, file the surface of the contact, and check if the internal springs, gaskets, and screws are loose, deformed, or detached.

變電柜的檢修：

Maintenance of substation cabinet:

1：操作前應按下列步驟進行：逐個斷開低壓側的負荷，斷開高壓側的斷路器，合上接地開關，并鎖好高壓開關柜，并在開關柜把手上掛上“禁止合閘，有人工作”的標志牌，然后用10mm2以上導線短接母排并掛接地線，緊固母排螺絲。

1: Before operation, the following steps should be followed: one by one, disconnect the load on the low voltage side, disconnect the circuit breaker on the high voltage side, close the grounding switch, lock the high voltage switchgear, and hang a sign "No Switching On, Someone is Working" on the handle of the switchgear. Then, use a wire of 10mm2 or more to short circuit the busbar and hang the grounding wire, and tighten the busbar screw.

2：檢修操作步驟：母排接觸處重新擦凈，并涂上電力復合脂，用新彈簧墊片螺絲加以緊固，檢查母排間的絕緣子、間距連接處有無異常，檢查電流、電壓、互感器的二次繞組接線端子連接的可靠性。

2: Maintenance operation steps: wipe the bus bar contact again, apply power compound grease, fasten it with new spring washer screws, check whether there is any abnormality at the insulator and spacing connection between bus bars, and check the reliability of current, voltage, and secondary winding terminal connection of transformer.

3： 送電前的檢查測試：拆除所有接地線、短接線，檢查工作現場是否留有工具，確定無誤后，合上隔離開關，斷開高壓側接地開關，合上運行變壓器高壓側斷路器，取下標志牌，向變壓器送電，然后再合上低壓側受電柜的斷路器，向母排送電，Z后合上有關聯絡柜和各支路自動空氣開關。

3: Inspection and testing before power transmission: Remove all grounding wires and short circuits, check if there are any tools left at the work site, confirm that there are no errors, close the isolation switch, disconnect the high-voltage side grounding switch, close the high-voltage side circuit breaker of the operating transformer, remove the signboard, power the transformer, and then close the circuit breaker of the low-voltage side receiving cabinet to power the busbar. After Z, close the associated winding cabinet and automatic air switches of each branch.

注意事項：

Precautions:

1：檢修過程中須設專人監護。

1: During the maintenance process, a dedicated person must be assigned to supervise.

2：工作前須驗電。

2: Prior to work, electrical verification is required.

3： 檢修人員應對整個配電柜的電氣機械聯鎖情況熟悉并操作。

3: Maintenance personnel should be familiar with and operate the electrical and mechanical interlocking of the entire distribution cabinet.

4：檢修中應詳細了解哪些線路是雙線供電。

4: During maintenance, it is necessary to have a detailed understanding of which lines are powered by dual wires.

5：檢修母排時，應對線路中的殘余電荷進行充分放電。

5: When repairing the busbar, the residual charges in the circuit should be fully discharged.

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