8 daily maintenance tasks for low-voltage distribution cabinets

8 daily maintenance tasks for low-voltage distribution cabinets

1. Implement segmented maintenance, first maintain the protection load section. When repairing the capacitor cabinet, first disconnect the main switch of the capacitor, discharge the capacitors one by one with a wire of 10mm or more, then check whether the contactors, capacitor wiring screws, and grounding devices are in good condition, check whether the capacitors are bulging, and use a vacuum cleaner to clean the dust inside the cabinet.

2. Stop protecting the load power supply. If the load continues to supply power, disconnect. Load power air switch, place the generator selection switch in the "stop" position, remove the positive and negative battery wires, and tie the "prevent generator power transmission" sign.

3. Check if there is any deformation or black discharge marks at the busbar joint, and tighten the connecting bolts. If the bolts rust, they should be replaced to ensure a tight connection. Check if the insulators on the busbar are loose or damaged.

4. Use the handle to shake down the air main switch from the power distribution cabinet, check if the main contacts have burn marks, check if the fire extinguishing cover is black or damaged, tighten the wiring screws, clean the dust inside the cabinet, and test the mechanical closure.

5. Take out the independent cabinet from the drawer, fix the terminals, check the installation and wiring of current transformers, meters, and kilowatt hour meters, check the flexibility and reliability of the handle operating mechanism, tighten the air inlet and outlet pipelines of the air switch, and clean the dust on the sockets behind the switch cabinet and distribution cabinet.

6. Gradually disconnect the low-voltage side air switch, then disconnect the high-voltage side vacuum circuit breaker that supplies power to the transformer, close the grounding switch, and hang a sign saying "No closing, someone is working".

After the load maintenance is completed, the generator can be started to supply power to it and the mains power can be stopped to maintain the bus section.

8. After maintaining the distribution cabinet according to the requirements of item 3, 4 and 5. Remove the safety device, disconnect the high-voltage side grounding switch, close the vacuum circuit breaker, observe that the transformer is in operation without any errors, and then gradually send power to the low-voltage distribution cabinet, and transfer the power supply of the protective load generator to the urban power supply.

Working conditions

ambient temperature: -15ºC~+40ºC;
*Altitude: no more than 1000m;
*Relative humidity: the average value of daily relative humidity shall not exceed 95%, the average value of monthly relative
humidity shall not exceed 90%, the average value of daily water vapor pressure shall not exceed 2.2kPa, and the average value of monthly water vapor pressure shall not exceed More than 1.8 kPa;
*Ambient air: not visibly contaminated by dust, smoke, corrosive and/or flammable gases, vapors, or salt spray; The vibration or ground movement from the outside of the switchgear and control equipment can be ignored;
*The amplitude of electromagnetic interference induced in the secondary system shall not exceed 1.6kV.
*Special Service Conditions: According to the national standard GBT11022-999 "Common Technical Requirements of High Voltage Switchgear and Control Equipment Standard", the circuit breaker should be operated under normal service conditions. If the working conditions used by the user are different from the normal operating conditions, such as the installation site is over 1000m above sea level, the ambient air temperature exceeds the limit specified in the normal operating conditions or the high humidity where condensation is easy to occur, the user shall consult with the manufacturer and reach an agreement.

Structure Characteristic

There are the horizontal type and vertical type , The shell is made of (2mm) high quality stainless steel or honeycomb structure stainless steel double-layer composite plate , It has the features of flame retardant, environmental protection, heat insulation, anti-condensation ,use the special stainless steel welding process , strength box structure , bright surface , no weld marks , The inner installation board with hot galvanizing process treatment , ensure that do not be rust within 20 years, There are the front door and back door , easy for client operate or repair , there are the high elastic and aging-resistant sealing strip around the door . Every door equipped with bright and dark door locks , The bright lock has the rain cover , measurement room is fully enclosed with lead sealing device , There is the inline cable pipe in the side of cabinet to prevent the rain, ventilation and cable outlet holes at the bottom . The top with ventilation lanes and wire nets for waterproof, rust, dust, foreign body function, protection grade IP54 .

PHOTO

This product is usually customized.
We are a manufacturer and have a professional technical department that can design and provide solutions according to customer needs.
Please contact our sales personnel to obtain design drawings

Here are our customer examples for your reference

Commodity : GCS LV withdrawable Switchgear
Project :hospital in Nepal
GCS LV withdrawable Switchgear 1
No Components Specification Unit Qty Maker 1 1
1 AC moulded case circuit breaker NM1-400S/3300 400A Pc 1 CHNT 交流塑壳断路器 NM1-400S/3300 400A 只 1 正泰电器
2 AC moulded case circuit breaker NM1-400S/3300 315A Pc 1 CHNT 交流塑壳断路器 NM1-400S/3300 315A 只 1 正泰电器
3 AC moulded case circuit breaker NM1-250S/3300 250A Pc 1 CHNT 交流塑壳断路器 NM1-250S/3300 250A 只 1 正泰电器
4 AC moulded case circuit breaker NM1-250S/3300 200A Pc 2 CHNT 交流塑壳断路器 NM1-250S/3300 200A 只 2 正泰电器
5 AC moulded case circuit breaker NM1-250S/3300 160A Pc 2 CHNT 交流塑壳断路器 NM1-250S/3300 160A 只 2 正泰电器
6 AC moulded case circuit breaker NM1-125S/3300 100A Pc 2 CHNT 交流塑壳断路器 NM1-125S/3300 100A 只 2 正泰电器
7 Current Transformer BH-0.66Ⅰ 400/5 φ30 0.5 Grade Pc 3 CHNT 电流互感器 BH-0.66Ⅰ 400/5 φ30 0.5级 只 3 正泰电器
8 Current Transformer BH-0.66Ⅰ 300/5 φ30 0.5 Grade Pc 3 CHNT 电流互感器 BH-0.66Ⅰ 300/5 φ30 0.5级 只 3 正泰电器
9 Current Transformer BH-0.66Ⅰ 250/5 φ30 0.5 Grade Pc 3 CHNT 电流互感器 BH-0.66Ⅰ 250/5 φ30 0.5级 只 3 正泰电器
10 Current Transformer BH-0.66Ⅰ 200/5 φ30 0.5 Grade Pc 6 CHNT 电流互感器 BH-0.66Ⅰ 200/5 φ30 0.5级 只 6 正泰电器
11 Current Transformer BH-0.66Ⅰ 150/5 φ30 0.5 Grade Pc 6 CHNT 电流互感器 BH-0.66Ⅰ 150/5 φ30 0.5级 只 6 正泰电器
12 Current Transformer BH-0.66Ⅰ 100/5 φ30 0.5 Grade Pc 6 CHNT 电流互感器 BH-0.66ⅠB 100/5 φ30 0.5级 只 6 正泰电器
13 Ammeter 6L2-A 400/5A Pc 3 CHNT 电流表 6L2-A 400/5A 只 3 正泰电器
14 Ammeter 6L2-A 300/5A Pc 3 CHNT 电流表 6L2-A 300/5A 只 3 正泰电器
15 Ammeter 6L2-A 250/5A Pc 3 CHNT 电流表 6L2-A 250/5A 只 3 正泰电器
16 Ammeter 6L2-A 200/5A Pc 6 CHNT 电流表 6L2-A 200/5A 只 6 正泰电器
17 Ammeter 6L2-A 150/5A Pc 6 CHNT 电流表 6L2-A 150/5A 只 6 正泰电器
18 Ammeter 6L2-A 100/5A Pc 6 CHNT 电流表 6L2-A 100/5A 只 6 正泰电器

IF NEED MORE DETAILES,PLEASE FEEL FREE TO CONTACT US