The protective function of solar photovoltaic inverter solar home is what

As photovoltaic inverter system internal important electrical equipment, the equipment itself is equipped with all kinds of protection function is relatively perfect, the concrete has the following basic protection function. ( 1) Dc bus over-voltage protection. Inverter dc bus voltage through continuous detection, when

inverter is one of the most important electrical equipment in photovoltaic power generation systems. The device itself is equipped with a variety of relatively perfect protection function, including the following basic protection function. ( 1) The DC bus over-voltage protection. Inverter for detection of DC bus voltage. When continuous DC voltage detected several times higher than 1000 v, the inverter disconnect ac contactor, closed to the power supply. ( 2) Ac over-voltage and under-voltage protection. Continuous detection of power grid voltage inverter, when the grid voltage detected in excess of the prescribed scope of the voltage value, open the ac contactor; If the ac voltage falls within the scope of the low voltage through the permission of the ( 20%) Low voltage across functions run inverter alarm. If there is no in power grid voltage allows low voltage across time, inverter will disconnect ac contactor, power supply and stop to the grid. ( 3) Ac frequency protection. Frequency inverter monitoring grid. When they tested the grid frequency in excess of the prescribed frequency range, without the permission of the inverter will be 0. Disconnect the ac contactor, 2 seconds and stop to the grid power supply. ( 4) The polarity reverse protection. When the DC output voltage is less than 100 v and procedures reverse DC current is detected more than 40 Ann, inverter tip reverse polarity protection and running is prohibited. ( 5) Short circuit protection. Continuous detection of grid inverter current of photovoltaic power station. When they tested the grid current is greater than the rated current of 1. Five times, the inverter disconnect ac contactor, and stop to the grid power supply. ( 6) Island effect of protection. Inverter using passive and active gudao detection algorithm to detect the grid. Once detected island phenomenon, inverter disconnect ac contactor, the inverter and separation of power network. ( 7) Overheating protection. When the temperature sensor detects the IGBT radiator temperature exceeds limit, open inverter ac contactor. ( 8) DC overload protection. The input power of the inverter for detection of DC side. When detected DC input power is greater than the limit, inverter automatic limit big output ac power to manageable.