Photovoltaic Grid-Connected Low Voltage Cabinet

The photovoltaic grid-connected low voltage cabinet provided by Taili factory collects the electrical energy output by the photovoltaic inverter and is responsible for safely transmitting it to the loads and the power grid. At the same time, it has comprehensive protection, monitoring and scheduling functions.

Main functions

The photovoltaic grid-connected low-voltage cabinet is by no means a simple "connection box". It performs the following key functions:

1. Power collection and distribution

· Collection: Combine the alternating current output from multiple photovoltaic inverters into one or several main circuits to enhance transmission efficiency.

· Distribution: Reasonably allocate the collected power to local loads (for users' own use) and transfer the remaining power to the grid.

2. Grid connection point

· This is the legal demarcation point between the photovoltaic system and the grid. Grid companies usually require metering and monitoring at this point to ensure that the photovoltaic system does not have adverse effects on the grid.

3. Comprehensive protection functions

· Overload and short-circuit protection: Use circuit breakers to prevent excessive current from damaging equipment or causing fires.

· Anti-reverse current protection (as needed): When the power generation exceeds the load electricity consumption, prevent the power from being fed back to the upper-level transformer (in some applications it is prohibited).

· Anti-islanding effect protection: This is the core safety function of the grid-connected system. When the grid is powered off, it is necessary to quickly disconnect the photovoltaic system from the grid to prevent the photovoltaic power from being transmitted to the power-off lines, endangering the safety of power grid maintenance personnel. Although the inverter itself has this function, the distribution cabinet is usually used as a backup protection.

· Over/under voltage, over/under frequency protection: Monitor grid parameters. Once an anomaly is detected, act immediately to protect equipment and the grid.

· Surge protection: Prevent overvoltage shocks such as lightning strikes from damaging expensive inverters and other equipment.

4. Monitoring and metering

· Smart meters: Install bidirectional meters to accurately measure the power generated by photovoltaics, the power fed into the grid, and the power drawn from the grid. These are the basis for electricity bill settlement.

· Monitoring devices: Monitor parameters such as voltage, current, power, power generation, power factor in real time through current/voltage transformers, power meters, etc.

5. Switching and control

· Provide disconnect switches, contactors, etc., to facilitate manual or automatic connection and disconnection operations, facilitating equipment maintenance and repair.

Please provide the following information, and we will be able to offer better services.

In order to facilitate better communication and for accurate ordering, please provide us with the single-line diagram of your photovoltaic system.