With the development of advanced technology solar panel system, the need for high-quality fuse is increased. The power generation system which changes solar radiation energy into electric energy via photovoltaic cell is called photovoltaic power generation system. It is made of power generation parts, control parts and storage measurement parts. Photovoltaic power generation DC current is proportion to solar irradiance. DC short-circuit current is related to solar irradiance, and also related to solar photovoltaic battery pack inherent short-circuit current. During short trouble, DC current produce electric arc very easily to cause electric wire and electrical equipment fire. If protective equipment can’t cut off the fault point timely, the chain reaction will be triggered, the fault will be enlarge. In general, photovoltaic power generation DC current faults is as follows: Terminals which is underside of fuse in combiner box short out; Junction bus which is upside of fuse in combiner box short out; Copper busbar in dc cabinet short out. In order to insulate photovoltaic string timely when photovoltaic panels fault occurs, improve generating efficiency, and prevent misconnection in the installation stage or other reasons cause local anomaly connection over-current damage. In the branch of each photovoltaic string, fuses are installed and fixed installed in combiner box. The photovoltaic array short circuit current is bigger than single photovoltaic string current, so it can cause fuse wire in series with photovoltaic string fuse to insulate fault photovoltaic string. Fuse is set in array, for subordinate Inverter components feedback current(such as a capacitance or capacitor feedback to the photovoltaic array and array wiring discharge), Within the scope of the rated breaking capacity, can also protect photovoltaic array.
