Outdoor Grid-connected PV Cabinet

Outdoor photovoltaic grid-connected cabinets are dedicated end-point grid-connected power distribution equipment for distributed photovoltaic power generation systems. The entire unit adopts an outdoor high-protection cabinet structure, integrating a grid-connected switch, intelligent monitoring and control unit, protection devices, power quality management module, and communication acquisition module. The equipment is mainly used for collecting, stabilizing, protecting, optimizing power quality, and ensuring safe grid connection of photovoltaic inverter output power. It possesses three core essential functions for photovoltaic grid connection: anti-islanding protection, power quality monitoring and management, and intelligent automatic reclosing .

This equipment is designed for harsh outdoor conditions, is waterproof and dustproof, anti-aging, and resistant to high and low temperatures. It can monitor grid-connected voltage, current, frequency, power, harmonics and other parameters in real time, and automatically complete fault protection, power optimization and grid restoration and reconnection. It meets the State Grid photovoltaic grid connection acceptance standards and is suitable for the unattended and intelligent operation needs of various distributed photovoltaic power stations.

GGDGFW -0.4 Outdoor Grid-Connected Photovoltaic Cabinet

• GGDGFW – Dedicated Grid-Connected Solar Cabinet
• 0.4 - Rated low-voltage grid-connected voltage 0.4kV

1. Ambient temperature: -25℃～+60℃, suitable for outdoor conditions such as high temperature exposure in summer and low temperature frost in winter;

2. Altitude: ≤1000m; for high-altitude areas, customized solutions for enhanced insulation and anti-condensation can be provided.

3. Relative humidity: ≤95%, no persistent condensation, water accumulation, or frost;

4. Environmental conditions: Suitable for outdoor use, with no corrosive or explosive gases, and no serious dust or salt spray pollution;

5. Installation site: well-ventilated, flat, free from severe vibration, and with good drainage.

1. Rated operating voltage: AC 380V/400V

2. Rated frequency: 50Hz

3. Rated operating current: 100A～2500A (optional)

4. Short-circuit breaking capacity: 30kA

5. Cabinet protection rating: IP44/IP54 (for outdoor use only)

6. Anti-islanding action time: ≤2s (meets national grid connection requirements)

7. Reclosing delay time: 10s～180s, programmable setting

8. Power quality monitoring: Real-time acquisition of harmonics, voltage, current, power factor, and frequency.

9. Communication methods: RS485, Ethernet, supporting remote monitoring from the backend.

10. Insulation class: Class B

The outdoor photovoltaic grid-connected cabinet uses a thickened cold-rolled steel plate electrostatic powder-coated outdoor-specific cabinet body, which is waterproof, dustproof, UV resistant, and corrosion resistant. The cabinet has a modular layout and is mainly equipped with: a main incoming circuit breaker, a grid-connected contactor, an intelligent anti-islanding protection device, an automatic reclosing controller, a power quality monitoring module, a reactive power compensation/filtering module, a multi-functional power meter, a surge protector, a communication data acquisition terminal, indicator lights, and operation buttons, etc.

The cabinet has a clear partitioned structure, separates strong and weak current circuits, and has neat wiring. It features independent ventilation and heat dissipation, anti-condensation, dustproof and waterproof design, making it suitable for long-term continuous outdoor operation.

■ Anti-islanding protection function (essential for grid-connected photovoltaic systems)

This grid-connected cabinet is equipped with a dedicated photovoltaic anti-islanding protection device, fully compliant with GB/T 19964 and IEC 62116 photovoltaic grid-connection standards. It can monitor the voltage, frequency, phase, and grid operating status at the grid connection point in real time, 24/7. When the external power grid experiences a sudden power outage, line maintenance tripping, or grid fault disconnection, the photovoltaic system and local loads may become isolated. The device can quickly and accurately identify the islanding effect and automatically trip and disconnect the photovoltaic grid-connected circuit within 2 seconds.

Protective function : Prevents photovoltaic systems from continuously sending power in reverse to faulty lines in isolated states, prevents endangering the personal safety of grid maintenance personnel, avoids equipment overvoltage damage, phase misalignment, grid connection accident tripping, ensures grid safety and photovoltaic equipment stability, and meets the mandatory requirements for grid connection acceptance.

Supporting protection logic: It integrates multiple auxiliary islanding discrimination functions such as overvoltage, undervoltage, overfrequency, underfrequency, reverse power, low-frequency load reduction, and high-frequency blocking to prevent false tripping and failure to trip.

■ Power quality monitoring and control functions

comprehensive power quality control for photovoltaic power generation, which is characterized by intermittency, fluctuation, and high harmonic interference . It can collect key power parameters in real time, such as three-phase voltage, current, active power, reactive power, power factor, frequency, 2nd-31st harmonic distortion rate, voltage deviation, and three-phase imbalance.

Governance and optimization functions

1. Harmonic suppression: Effectively filters out high-frequency harmonics generated by photovoltaic inverters, reduces harmonic distortion rate, and meets GB/T 14549 power quality standards;

2. Reactive power compensation: Automatically and dynamically compensates reactive power, improves the power factor at the grid connection point, and avoids power factor penalties;

3. Voltage stabilization and regulation: Suppressing voltage fluctuations caused by morning and evening power generation of photovoltaic power, thus stabilizing the grid-connected voltage;

4. Three-phase imbalance management: Correcting three-phase load deviations, reducing line losses, and improving power grid quality.

It also supports power quality data storage, uploading, and anomaly alarms, and can trace grid-connected power data throughout the entire process to ensure compliant grid connection and efficient power generation of photovoltaic power plants.

■ Intelligent automatic reclosing function

This grid-connected cabinet is equipped with a programmable intelligent automatic reclosing control system, which is suitable for temporary fault scenarios such as instantaneous faults in the photovoltaic grid, short-term power outages, and voltage fluctuations. When the grid trips due to instantaneous short circuits, instantaneous voltage drops, line flashovers, or temporary power outages, the system will not be locked out for an extended period.

Working logic : The device monitors the grid recovery status in real time. After the grid fault is eliminated and the voltage and frequency return to the normal range, it automatically performs a reclosing operation after a programmable delay (10-180s) to automatically restore photovoltaic grid-connected power generation without the need for manual on-site reclosing.

Safety interlocking mechanism : It has residual voltage interlocking, synchronization detection, and fault locking functions. If the power grid fault persists, reclosing will be automatically interlocked, preventing reverse reclosing and avoiding secondary impact damage to the equipment, thus balancing intelligence and safety. It supports multiple reclosing cycles, fault memory, and action record query.

1. Compliant grid connection configuration: Standard configuration includes national standard anti-islanding protection, which is precise in action and fast in response, fully meeting the grid acceptance standards;

2. Power quality optimization: Integrating monitoring, filtering, reactive power compensation, and voltage stabilization, it effectively improves power generation efficiency and grid connection quality;

3. Intelligent self-healing operation: The automatic reclosing function enables instantaneous self-healing of power grid faults, reduces manual operation and maintenance, and is suitable for unattended power stations.

4. High outdoor protection: IP44/IP54 high protection rating, waterproof, dustproof, sunproof, and anti-condensation, suitable for complex outdoor working conditions;

5. Multiple safety protections: Integrated short circuit, overload, leakage, overvoltage, undervoltage, lightning protection, and islanding protection, providing comprehensive protection for equipment and power grid safety;

6. Intelligent remote operation and maintenance: Supports data uploading, remote monitoring, fault alarms, and event logging, making operation and maintenance convenient;

7. Modular design: simple structure, low failure rate, and convenient installation, maintenance, and expansion.

1. Installation environment: Choose a well-ventilated, dry outdoor site that is free from water accumulation, direct sunlight, and corrosive gases. The cabinet should be installed vertically and fixedly.

2. Wiring Installation: Connect the photovoltaic inverter output cable and grid connection line in accordance with specifications, and ensure reliable grounding with a grounding resistance ≤4Ω;

3. Parameter setting: Set the anti-islanding protection settings, reclosing delay, voltage frequency threshold, and reactive power compensation parameters according to the power grid requirements;

4. Functional debugging: Simulate islanding faults, power outages, and abnormal voltage conditions to test anti-islanding tripping, reclosing recovery, and power quality management functions;

5. Grid-connected trial operation: After confirming that all protection, monitoring, and reclosing functions are normal and that power quality parameters meet the standards, the system will be officially put into grid-connected operation.

1. Routine inspection: Check the cabinet seal, indicator lights, and instrument parameters; check for overheating, abnormal noises, and moisture; and review the fault records.

2. Regular maintenance: Tighten the wiring terminals, clean the dust inside the cabinet, and check the status of the lightning protection, protection, and communication modules every quarter;

3. Annual verification: Verify the accuracy of anti-islanding protection operation, reclosing logic, and power quality monitoring to ensure stable and reliable functionality;

4. It is strictly forbidden for non-professionals to change the protection settings or remove the protection devices without authorization, in order to avoid grid connection failures.

1. The equipment must be transported stably and securely to avoid impact, tipping, rain, and sun exposure, and to protect the cabinet and internal components.

2. The storage environment should be dry, well-ventilated, and free of corrosive gases. For long-term storage, the cabinet seal and the condition of components should be checked regularly.

1. This product is manufactured in strict accordance with national and industry standards. Before leaving the factory, it undergoes full-function testing, protection testing, and power quality calibration. Only products that pass the tests can be shipped out.

2. The product warranty period is 18 months from the date of manufacture or 12 months from the date of commissioning (whichever comes first). During the warranty period, non-human-caused damage will be repaired and replaced free of charge.

3. Provide technical guidance, on-site debugging, parameter setting, operation and maintenance training, and after-sales technical support.