The so-called islanding effect refers to the situation where a power generation device integrated into the public power grid cannot detect or has no corresponding detection means in the event of a power outage, and still feeds electricity to the public power grid. Due to the potential danger of islanding and damage to equipment, owners of public works and power generation equipment have long been concerned about the anti islanding control of photovoltaic grid connected inverters. Therefore, islanding effects must be prevented in the application of photovoltaic grid connected power generation systems. The principle of islanding effect is that in a circuit with capacitors in series, only the two plates connected to the external circuit (note: not the plates of the same capacitor) have current flowing (charge exchange), and the total amount of charge on the other plates remains unchanged, so it is called an islanding. Isolation is an electrical phenomenon that occurs when a portion of the power grid is disconnected from the main grid, and this portion of the grid is entirely powered by photovoltaic systems. This is still a controversial issue in the international standardization of photovoltaic grid connection, as islanding can harm the safety of the public and power company maintenance personnel, as well as the quality of power supply. It may damage equipment when automatically or manually closing the power switch to restore power to the islanded grid. So, inverters usually come with devices to prevent islanding effects.

For example,SCP-3-1 represents 3 input strings and 1 output string, which are combined into one channel with multiple inputs and equal current and constant voltage.

Due to the built-in overload protection device of the circuit breaker, which is related to the ambient temperature, the higher the temperature, the greater the current, and the shorter the overload protection time. The shorter the product action time, the more likely it is to trip. The factory setting standard is set at 30 degrees. The selection of grid connected circuit breakers depends on whether there is direct sunlight at the location where the grid is placed. It is recommended to use a current level of 1.5-2 times the maximum output AC current of the inverter. For those with direct sunlight and no heat dissipation measures in the net cage, choose twice the amount. Quick calculation: The rated current of the circuit breaker is equal to the three-phase inverter power multiplied by 1.65 times x (15-2), and the current level of the circuit breaker is selected one level higher.

Control voltage: AC230V

TI mainly targets outdoor distribution cabinets, T2 mainly targets indoor distribution boxes, and TI+T2 means it is suitable for both indoor and outdoor use.

The shunt release is an accessory for remotely controlling the opening of the circuit breaker. When the power supply voltage is equal to any voltage between 70% and 110% of the rated control power supply voltage, the circuit breaker can be reliably disconnected.

Both input and output are communication.