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.

低压配电柜的保养的内容及步骤：

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

1：检修时应从变压器低压侧开始。配电柜断电后，清洁柜中灰尘，检查母线及引下线连接是否良好，接头点有无发热变色，检查电缆头、接线桩头是否牢固可靠，检查接地线有无锈蚀，接线桩头是否紧固。所有二次回路接线连接可靠，绝缘符合要求。

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： 检查抽屉式开关时，抽屉式开关柜在推入或拉出时应灵活，机械闭锁可靠。检查抽屉柜上的自动空气开关操作机构是否到位，接线螺丝是否紧固。清除接触器触头表面及四周的污物，检查接触器触头接触是否完好，如触头接触不良，必要时可稍微修锉触头表面，如触头严重烧蚀（触头点磨损至原厚度的1/3）即应更换触头。电源指示仪表、指示灯完好。

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：检修电容柜时，应先断开电容柜总开关，用10mm2以上的一根导线逐个把电容器对地进行放电后，外观检查壳体良好，无渗漏油现象，若电容器外壳膨胀，应及时处理，更换放电装置、控制电路的接线螺丝及接地装置。合闸后进行指示部分及自动补偿部分的调试。

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：受电柜及联络柜中的断路器检修：先断开所有负荷后，用手柄摇出断路器。重新紧固接线螺丝，检查刀口的弹力是否符合规定。灭弧栅有否破裂或损坏，手动调试机械联锁分合闸是否准确，检查触头接触是否良好，必要时修锉触头表面，检查内部弹簧、垫片、螺丝有无松动、变形和脱落。

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.

变电柜的检修：

Maintenance of substation cabinet:

1：操作前应按下列步骤进行：逐个断开低压侧的负荷，断开高压侧的断路器，合上接地开关，并锁好高压开关柜，并在开关柜把手上挂上“禁止合闸，有人工作”的标志牌，然后用10mm2以上导线短接母排并挂接地线，紧固母排螺丝。

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：检修操作步骤：母排接触处重新擦净，并涂上电力复合脂，用新弹簧垫片螺丝加以紧固，检查母排间的绝缘子、间距连接处有无异常，检查电流、电压、互感器的二次绕组接线端子连接的可靠性。

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： 送电前的检查测试：拆除所有接地线、短接线，检查工作现场是否留有工具，确定无误后，合上隔离开关，断开高压侧接地开关，合上运行变压器高压侧断路器，取下标志牌，向变压器送电，然后再合上低压侧受电柜的断路器，向母排送电，Z后合上有关联络柜和各支路自动空气开关。

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.

注意事项：

Precautions:

1：检修过程中须设专人监护。

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

2：工作前须验电。

2: Prior to work, electrical verification is required.

3： 检修人员应对整个配电柜的电气机械联锁情况熟悉并操作。

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

4：检修中应详细了解哪些线路是双线供电。

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

5：检修母排时，应对线路中的残余电荷进行充分放电。

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

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