HUARUI 
GGJI Type Automatic Reactive Power Compensation Static Capacitor Distribution Cabinet
The GGJI Type Automatic Reactive Power Compensation Static Capacitor Distribution Cabinet is suitable for power systems with a frequency of 50Hz, rated working voltage of 380V, and rated compensation capacity of 45~300kvar. It is used as an automatic or manual reactive power compensation device in power plants, substations, industrial and mining enterprise substations, and distribution rooms.
The cabinet framework is assembled by partial welding using 8MF cold-formed steel sections. All components are designed on the modular principle and are provided with mounting holes on a 20mm module.
To address heat dissipation during operation, ventilation slots are provided at both the top and bottom of the cabinet. When capacitors inside the cabinet generate heat, the warm air is expelled through the upper slots, while cool air continuously enters through the lower slots, forming a natural ventilation path from bottom to top within the enclosed cabinet, achieving effective heat dissipation.
The cabinet door is connected to the framework by a hinge-type movable linkage. A rubber strip with a mountain-shaped cross-section is embedded in the folded edge of the door. When the door is closed, the compression travel of the sealing strip between the door and the framework is maintained, preventing direct impact between the door and the cabinet body.
The instrument door is connected to the framework by multi-strand flexible copper wire. Electrical components inside the cabinet are connected using knurled screws, forming a complete grounding protection circuit throughout the entire cabinet.
The top cover of the cabinet can be removed when necessary to facilitate the assembly, installation, and adjustment of the main busbar on site. Four lifting rings are provided at the four corners of the cabinet top for lifting and transport purposes.
6.External dimensions (height × width × depth): 2200 × 800 (1000) × 600 mm. The distribution cabinet can be used in conjunction with GGD (1, 2, 3) distribution switchgear or other distribution cabinets with the same height and depth dimensions. It can also be installed and used independently.
|
Parameter |
Specification |
|
Rated Working Voltage |
380V |
|
Total Reactive Power Compensation Capacity |
45 ~ 300 kVar |
|
Number of Circuits per Cabinet |
6, 8, or 10 circuits |
|
Power Factor Compensation Range |
0.85 ~ 0.95 |
|
Automatic Switching Interval Between Circuits |
10 ~ 120 seconds |
|
Auxiliary Circuit Control Voltage |
AC 220V, 380V |
|
Enclosure Protection Level |
IP30 |
Enclosure
Made of 8MF cold-formed steel sections, welded and assembled. 20mm module mounting holes. Ventilation slots at top and bottom. Removable top cover. Lifting rings at four corners.
Capacitor
Dry-type or oil-immersed low voltage shunt capacitors, used to provide reactive power compensation and improve power factor.
Thyristor Switch / Contactor
Automatically switches capacitors on and off according to controller commands, achieving contactless or mechanical switching.
Reactive Power Controller
Real-time monitoring of grid power factor, automatically calculates and controls capacitor switching (in or out).
Fuse and Circuit Breaker
Provides short circuit and overload protection for capacitor circuits, ensuring safe equipment operation.
Series Reactor
Suppresses inrush current and harmonic amplification, protecting capacitors from harmonic damage.
Discharge Resistor
Connected in parallel across the capacitor terminals, quickly releases residual charge after power cut, ensuring maintenance personnel safety.
Cooling Fan
Automatically starts when the internal temperature is too high, providing forced ventilation to prevent capacitor overheating damage.
1. Core Product Advantages
① The cabinet framework is assembled by partial welding using 8MF cold-formed steel sections. All components are designed on the modular principle and are provided with mounting holes on a 20mm module.
② To address heat dissipation during operation, ventilation slots are provided at both the top and bottom of the cabinet. When capacitors inside the cabinet generate heat, the warm air is expelled through the upper slots, while cool air continuously enters through the lower slots, forming a natural ventilation path from bottom to top within the enclosed cabinet, achieving effective heat dissipation.
③ The cabinet door is connected to the framework by a hinge-type movable linkage. A rubber strip with a mountain-shaped cross-section is embedded in the folded edge of the door. When the door is closed, the compression travel of the sealing strip between the door and the framework is maintained, preventing direct impact between the door and the cabinet body. The instrument door is connected to the framework by multi-strand flexible copper wire. Electrical components inside the cabinet are connected using knurled screws, forming a complete grounding protection circuit throughout the entire cabinet.
④ The top cover of the cabinet can be removed when necessary to facilitate the assembly, installation, and adjustment of the main busbar on site. Four lifting rings are provided at the four corners of the cabinet top for lifting and transport purposes.
⑤ External dimensions (height × width × depth): 2200 × 800 (1000) × 600 mm. The distribution cabinet can be used in conjunction with GGD (1, 2, 3) distribution switchgear or other distribution cabinets with the same height and depth dimensions. It can also be installed and used independently.
2. Service Life
Under standard operating conditions and proper usage, the overall design service life of the GGJI type automatic reactive power compensation capacitor distribution cabinet can reach 15 to 20 years.
Enclosure Life: Made of 8MF cold-formed steel section welded structure, offering good mechanical strength and corrosion resistance. The service life can reach over 20 years.
Capacitor Life: Low voltage shunt capacitors, under rated operating conditions, have a service life of approximately 8 to 12 years, which is significantly affected by ambient temperature, harmonic content, and switching frequency.
Other Component Life: The reactive power controller has a service life of approximately 8 to 10 years. Contactors and thyristor switches can withstand approximately 100,000 switching operations. Fuses, reactors, and other components can achieve a service life of over 15 years.
Regular maintenance (cleaning, tightening, capacitor inspection) and maintaining good ventilation and heat dissipation can effectively extend the overall service life of the equipment.
1. Daily Maintenance
1. Enclosure and Environment Inspection: Weekly check whether the cabinet is deformed or rusted, whether there are foreign objects or water accumulation inside the cabinet, and whether the temperature and humidity of the distribution room are within specified ranges.
2. Operating Parameter Monitoring: Daily observe whether the power factor display is normal (0.85~0.95) and whether capacitor switching indications are consistent with controller commands.
3. Capacitor Inspection: Monthly check capacitors for bulging, oil leakage, or abnormal noise. Measure whether three-phase currents are balanced and whether overcurrent exists.
4. Contactor and Fuse Inspection: Monthly check contactor contacts for burning or pitting, verify proper pick-up, and check fuses for blowing or overheating.
5. Reactor and Connection Inspection: Every six months check reactors for overheating or abnormal noise, verify that connection bolts are tight, and check for aging wires.
6. Controller and Instrument Inspection: Every six months check whether the controller display is normal, whether parameter settings have changed, and whether switching timing is accurate.
7. Cooling Fan Inspection: Monthly check whether the fan operates normally, whether there is abnormal noise, whether air ducts are clear, and whether filters are clogged.
8. Cabinet Interior Cleaning: At least once a year, use a vacuum cleaner or dry compressed air to clean dust inside the cabinet, focusing on capacitors and reactor surfaces.
9. Discharge Resistor Inspection: Annually check whether discharge resistors are intact and whether residual capacitor charge is fully released within the specified time after power cut.
10. Earthing System Inspection: Every six months check whether the main earthing busbar and cabinet grounding are reliable, with earthing resistance meeting the ≤4Ω requirement.
2. Safety Regulations
1. Installation Environment Requirements: Indoor installation. Ambient temperature: -5℃ ~ +40℃. Altitude ≤2000m. Free from conductive dust, corrosive gases, and severe vibration.
2. Installation Inclination: The cabinet installation inclination from the vertical plane shall not exceed 5°, and the entire group of cabinets shall be relatively level.
3. Space Clearance Requirements: Front operation channel ≥1.5m, rear maintenance channel ≥0.8m, top clearance to ceiling ≥0.5m to ensure heat dissipation and ventilation.
4. Foundation and Earthing: Install on horizontal foundation channel steel with flatness error ≤1mm/m. Cabinet shall be reliably connected to the earthing busbar with earthing resistance ≤4Ω.
5. Busbar Connection: Main busbar connections shall be silver-plated or tinned. Bolt tightening torque shall comply with standards. Contact surfaces shall be coated with conductive grease.
6. Cable Incoming and Outgoing: Cables shall enter and exit from the bottom of the cabinet. Cables inside the cable compartment shall be securely tied. Cable terminations shall be properly made with sufficient length reserved for maintenance.
7. Ventilation and Heat Dissipation Requirements: Upper and lower ventilation slots shall not be blocked. Clearance shall be reserved in front of and behind the cabinet for heat dissipation. When multiple cabinets are installed side by side, gaps shall be left between them.
8. Lifting and Transport: Use the four lifting rings at the top of the cabinet for lifting. Do not invert or tilt the cabinet. Precision components such as controllers shall be properly secured during transport.
9. Pre-Energization Inspection: Confirm that no tools or debris remain inside the cabinet, all bolts are tightened, capacitors are not damaged, and insulation resistance meets requirements.
10. Special Locations: When the equipment is to be used in offshore oil platforms, nuclear power plants, or other special locations, a separate technical agreement shall be signed.
It is used as an automatic or manual reactive power compensation device in power plants, substations, industrial and mining enterprise substations, and distribution rooms.
1. Environmental Risks
1. Overheating Risk: When ambient temperature exceeds 40°C or ventilation is poor, the internal dielectric temperature of the capacitors rises, accelerating aging and potentially causing bulging, liquid leakage, or even explosion.
2. Moisture and Condensation Risk: High humidity causes condensation on insulation parts inside the cabinet, reducing insulation resistance and potentially leading to phase-to-phase short circuits or creepage discharge.
3. Dust Contamination Risk: Conductive dust accumulates on the surfaces of capacitors, reactors, and busbars, reducing heat dissipation and possibly causing partial discharge or short circuit faults.
4. Harmonic Pollution Risk: When harmonic content in the power grid is too high, resonance occurs between capacitors and the system, causing capacitor overcurrent and heating, accelerating damage or even burnout.
5. Overvoltage Risk: Switching overvoltage or lightning overvoltage impacts may puncture the internal dielectric of capacitors, causing permanent capacitor damage.
6. Vibration Impact Risk: Proximity to large vibrating equipment may cause connection bolts to loosen and internal capacitor structure to be damaged, affecting switching reliability.
7. Corrosive Gas Risk: Corrosive gases in chemical plants, sewage treatment facilities, and similar locations corrode metal parts, leading to oxidation of the cabinet and terminals, resulting in increased contact resistance.
8. Inrush Current Switching Impact Risk: The inrush current generated when capacitors are switched on (can reach 10 to 20 times the rated current) will reduce the service life of capacitors and contactors under frequent impact.
2. Installation Restrictions
① Ambient temperature: -5°C to +40°C, with an average temperature over any 24-hour period not exceeding +35°C.
② Indoor installation and use. The altitude at the installation site shall not exceed 2000m.
③ Relative humidity of the surrounding air shall not exceed 50% at a temperature of +40°C. Higher relative humidity is permitted at lower temperatures (for example 90% at +20°C). Occasional condensation due to temperature variations is permissible. The installation inclination angle shall not exceed 5°.
④ The equipment shall be installed in a location free from severe vibration and impact, as well as corrosive conditions that may damage the electrical components.
⑤ If the user has special requirements, they shall negotiate with the manufacturer.
Due to the unique characteristics of the cabinet, the quotation for this product requires certain technical parameters. Full-dimensional personalized customization is also supported. The main ordering instructions are as follows:
1. When placing an order, the user shall provide the main circuit power distribution system diagram and the layout plan.
2. For all low voltage electrical equipment shown in the main circuit power distribution system diagram, the following information shall be specified: model number, rated working voltage, rated working current, protection device setting current, and other necessary technical parameters.
3. When placing an order, the user shall also provide the auxiliary circuit diagram or select the auxiliary circuit number.
4. The manufacturer generally does not supply the main busbar. If the user requires the supply of the main busbar, the busbar model, specifications, and quantity shall be provided.
