The distributed photovoltaic protection switch adopts residual current reclosing plastic shell circuit breakers as the main body, and adds photovoltaic specific protection functions, HPLC or HPLC dual-mode communication functions, power quality monitoring functions, and precise measurement and other power Internet of Things functions. For the convenience of description, hereinafter referred to as circuit breaker. Circuit breakers used for connecting photovoltaic power generation systems to low-voltage power grids, mainly including the following functions

a) Islanding protection: When the power grid is cut off, the islanding protection of the inverter itself is not relied upon, and the connection between the photovoltaic power generation system and the low-voltage distribution network is cut off

b) Overload protection and short circuit protection: Whether it is a short circuit in the outgoing line of the photovoltaic power generation side or the low-voltage grid side, the circuit breaker cuts off the grid connection when overloaded to protect the stability of the system

c) Power quality monitoring: analysis of grid connected voltage and current harmonics, evaluation of power quality, providing data basis for assessing power generation quality

d) Measurement function: Measure power generation, voltage, current, and frequency to provide data support for power supply and load response in the entire Taiwan region