Photovoltaic grid-connected cabinet
- Product Description
- Short circuit and overload protectionEquipped with molded case or frame circuit breakers to rapidly interrupt abnormal current in the circuit.
- Lightning protectionBuilt-in surge protector (nominal discharge current 20kA/40kA) to withstand lightning overvoltage surges.
- Overvoltage, undervoltage and phase-loss protectionAutomatic tripping occurs when the grid voltage is abnormal to protect downstream equipment.
- Isolation protectionThe isolating switch provides a visible breaking point to ensure safe isolation for maintenance.
- Check for closing under pressure and automatic reclosingIt automatically trips during power grid outages and automatically recloses after voltage restoration, supporting unattended scenarios.
- Online power quality monitorMonitor indicators such as harmonic waves at the grid connection point and power factor in real time.
- Anti-islanding protection deviceActively disconnect from the grid during power outages to prevent the risk of islanding operation.
- Fault disconnection deviceRapid splitting in case of power grid failures to ensure the safety of the grid side.
Product Overview
The XL-21 photovoltaic (PV) grid-connection cabinet is a specialized PV grid-connection device developed by Changsong Electric Co., Ltd. based on the XL-21 low-voltage power distribution cabinet platform, specifically designed for distributed PV power generation systems. As the core hub between PV inverters and step-up transformers or the public grid, this product enables efficient conversion, distribution, and safe control of electrical energy. Its operational logic involves collecting alternating current (AC) outputs from multiple string inverters, integrating and protecting the power through internal components such as circuit breakers, disconnect switches, and surge protectors, and ultimately feeding it to the grid or transformer via the main output to achieve safe grid connection of PV electrical energy. The cabinet body is assembled using locally welded cold-formed steel sections, featuring a compact structure and intuitive operation. It is suitable for fixed power distribution scenarios requiring indoor wall-mounted installation and front-panel maintenance, widely covering distributed PV grid-connection lines with capacities ranging from 100 kW to 1 MW.
Main product features
1. Integrated as a complete set, with one-stop functional configuration
The XL-21 photovoltaic grid-connection cabinet highly integrates core components such as circuit breakers, disconnect switches, metering instruments, and surge protectors into a single cabinet. Users can flexibly configure functional modules according to project requirements to achieve full-process grid-connection functions including convergence, protection, metering, and control. This design significantly reduces the complexity of on-site decentralized wiring and multi-cabinet assembly, enhancing installation efficiency and system reliability.
2. Comprehensive electrical protection functions
For photovoltaic grid-connected scenarios, the product provides multi-level safety protection:
3. Wide current coverage, suitable for projects of different scales
The product features a wide current coverage range, supporting molded case recloser solutions (100A~800A) and universal frame circuit breaker solutions (200A~4000A). It can flexibly meet the needs of photovoltaic projects ranging from hundreds of kilowatts to megawatts, reducing the difficulty and cost of model selection.
4. The cabinet is sturdy, with convenient installation and maintenance.
The cabinet body adopts steel plate stamping and angle steel welding processes, with heat dissipation slots provided at the top and bottom ends. A convection heat dissipation channel is formed through natural ventilation, resolving the heat dissipation issue of enclosed cabinet bodies. The cable entry method supports bottom cable introduction (top entry can be customized). After the front door is opened, the internal equipment is fully exposed, facilitating inspection and maintenance. In terms of environmental adaptability, the product can operate stably within a temperature range of -25°C to +60°C and at altitudes not exceeding 3000m.
5. Flexible configuration for extended intelligent management
It supports multiple optional functions to meet differentiated needs:
Detailed product parameters
| Parameter category | Detailed description |
|---|---|
| Brand | Changsong Electric Appliance |
| Place of origin | Made in China |
| Product model | XL-21 |
| Function | Photovoltaic grid connection |
| Cabinet material | Local welding of cold-formed steel sections |
| Current coverage range | Molded case solution: 100A~800A; Frame solution: 200A~4000A |
| Voltage level | AC380V (default) |
| Protection grade | IP20 (Indoor Standard) |
| Operating temperature | -25°C to +60°C |
| Altitude adaptability | ≤3000m |
| Installation method | Installed indoors against the wall, with maintenance in front of the panel |
| Inlet wire method | Bottom cable entry (top cable entry customizable) |
| Optional functions | Power quality monitoring, anti-islanding protection, fault disconnection |
Scope of application
1. Industrial and commercial distributed photovoltaic projects
It is applicable to scenarios such as factory roofs, logistics parks, and commercial buildings, serving as a collection and protection node between photovoltaic inverters and 0.4 kV low-voltage grid-connection cabinets, supporting the "self-consumption and surplus electricity online" model to enhance energy utilization efficiency.
2. Small and medium-scale photovoltaic power stations (100kW~1MW)
As a standardized grid-connected power distribution equipment, it provides reliable functions of power collection, protection, and metering for projects ranging from hundreds of kilowatts to megawatt-scale, reducing system complexity and operational and maintenance costs.
3. Industrial Power Distribution and Photovoltaic Supporting Facilities
Leveraging the versatility of the XL-21 cabinet platform, it can be extended to power distribution scenarios in industrial and mining enterprises, providing photovoltaic power distribution and control solutions for equipment such as water pumps and fans.
Frequently Asked Questions (FAQ)
Q1: Does the XL-21 photovoltaic grid-connected cabinet support outdoor installation?
A: The product is designed by default for indoor installation. For outdoor use, a customized outdoor-type cabinet or additional protective facilities (such as rain covers and sun-resistant coatings) are required, and it must be ensured that environmental conditions such as temperature and humidity meet the parameter requirements.
Q2: How to select the type of circuit breaker?
A: Determined based on the total installed capacity of the project: For projects with a capacity ranging from 100A to 800A, a molded-case recloser solution is recommended; for projects with a current exceeding 800A, a universal frame circuit breaker solution is advised. Additionally, it is necessary to confirm the grid connection voltage level (typically AC380V) and whether optional functions (such as power quality monitoring) are required.
Q3: How does the product achieve lightning protection?
A: Built-in Surge Protective Device (SPD) with a nominal discharge current of 20kA/40kA can effectively absorb transient overvoltages caused by lightning strikes, protecting the inverter and grid equipment from impacts. Regularly inspect the status of the SPD to ensure its protective effectiveness.
Q4: Can non-professionals operate the equipment inside the cabinet?
A: Operation by non-professionals is strictly prohibited! Installation and maintenance must be carried out by licensed electricians in strict accordance with the grid connection technical requirements of the local power grid company. Before operation, the power supply must be disconnected and warning signs hung to ensure the safety of personnel and equipment.
Q5: Does the product support the expansion of intelligent functions?
A: Supported. Users can select and equip modules such as online power quality monitors, anti-islanding protection devices, and fault disconnection devices based on project budget and management requirements to achieve remote monitoring, fault warning, and automated management, thereby enhancing system operational efficiency.