Detailed Introduction of GGJ Low-voltage Capacitor Cabinets

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# Structural Features
- **Cabinet Structure**: Generally, it is fabricated and assembled from 8MF open-section steel or cold-rolled steel plates through bending. The protection level of the cabinet usually reaches IP30 or above, which can effectively prevent dust and the intrusion of foreign objects.
- **Internal Layout**: The internal electrical components are arranged reasonably. There are independent compartments, such as the busbar chamber, circuit breaker chamber, capacitor chamber, and control circuit chamber. These compartments are isolated from each other to ensure safe operation and convenient maintenance.
- **Connection Mode**: The busbars are generally connected with copper bars or aluminum bars, which have good electrical conductivity and mechanical strength. The connection between electrical components is realized through wires or busbars. The connections are firm and reliable, and standard terminal blocks are used, making wiring and maintenance convenient.

### Working Principle
GGJ low-voltage capacitor cabinets mainly achieve reactive power compensation by connecting capacitor banks in parallel in the low-voltage power distribution system. When inductive loads in the power grid, such as motors and transformers, are operating, they consume a large amount of reactive power, resulting in a decrease in the power factor. After the capacitors in the capacitor cabinet are connected to the power grid, they will generate reactive current that leads the voltage. This reactive current offsets the reactive current of the inductive loads, thereby reducing the transmission of reactive power in the power grid, improving the power factor, reducing line losses, and improving voltage quality.

### Performance Parameters
- **Rated Voltage**: Commonly 380VAC 3~, and some can also be applied to 660VAC 3~ systems.
- **Rated Frequency**: Generally 50Hz or 60Hz.
- **Compensation Capacity**: Usually ranging from 60kvar to 420kvar, and can be selected and combined according to actual needs.
- **Compensation Mode**: It adopts a combination of three-phase compensation and single-phase compensation. The switching modes include cyclic switching, coded switching, automatic switching controlled by fuzzy control, etc. The fastest response time is ≤20ms.

### Main Components and Their Functions
- **Capacitors**: They are the core components for realizing reactive power compensation. They store and release electric field energy, providing reactive power support for the power grid.
- **Reactors**: Connected in series with the capacitors, their main functions are to limit the inrush current when the capacitors are put into operation, suppress harmonics in the power grid, and protect the capacitors and other electrical components.
- **Contactors**: Used to control the switching on and off of the capacitor banks, achieving automatic control of reactive power compensation.
- **Fuses**: When an overload or short-circuit fault occurs in the circuit, the fuse elements melt and cut off the circuit to protect the safety of electrical equipment and lines.
- **Controllers**: They monitor parameters such as the power factor, voltage, and current of the power grid in real time. According to the preset control strategy, they automatically control the switching on and off of the capacitor banks to keep the power factor within the set range.

### Maintenance and Upkeep
- **Daily Maintenance**: Regularly clean the dust on the surface and inside of the cabinet. Check whether the cabinet doors open and close flexibly and whether the door locks are in good condition. Check whether the capacitors have phenomena such as swelling, deformation, and oil leakage. Check whether the wiring is firm and the grounding is good.
- **Periodic Overhaul**: Conduct a comprehensive overhaul of the capacitor cabinet at regular intervals. Check whether the contacts of electrical components such as circuit breakers, contactors, and relays are worn, whether the operating mechanisms are flexible, and whether the arc extinguishers are intact. Test the capacity and insulation resistance of the capacitors, check whether the inductance value of the reactors has changed, and conduct functional tests on the control circuit.
- **Fault Handling**: When a fault occurs in the capacitor cabinet, cut off the power supply in a timely manner and conduct inspections and repairs. Common faults include capacitor damage, contactor failures, controller failures, and line short circuits or open circuits. Professional testing tools and instruments can be used to troubleshoot and repair the faults.

### Application Scenarios
- **Industrial Field**: Widely applied in factories and mines in industries such as light textile, metallurgy, chemical industry, mining, and machinery. It is used to compensate for the reactive power generated by a large number of inductive loads such as asynchronous motors and transformers, improving the operating efficiency and power quality of the internal power systems of enterprises, and reducing production costs.
- **Commercial and Civil Buildings**: Such as shopping malls, office buildings, hotels, and residential communities. It is used to compensate for the reactive power of equipment such as air conditioners, elevators, and lighting, reducing electricity bills, improving power supply reliability and voltage stability, and providing a good power supply environment for users.
- **Power System**: In places such as substations and switchgear rooms, it is used for centralized compensation of the reactive power of the power system, improving the power factor of the power grid, improving the operating performance of the power grid, reducing grid losses, and enhancing the power supply capacity and stability of the power grid.
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