ETI Green Protect: Overcurrent and overvoltage protection for photovoltaic systems - ETI - #1

Text version of the page

table.main {} tr.row {} td.cell {} div.block {} div.paragraph {} .font0 { font:14.00pt "Arial", sans-serif; } .font1 { font:5.00pt "Lucida Sans Unicode", sans-serif; } .font2 { font:8.00pt "Lucida Sans Unicode", sans-serif; } .font3 { font:23.00pt "Lucida Sans Unicode", sans-serif; } .font4 { font:8.00pt "Times New Roman", serif; } .font5 { font:9.00pt "Times New Roman", serif; } .font6 { font:12.00pt "Times New Roman", serif; } DC - distribution and protection components Introduction Photovoltaic Systems are composed by photovoltaic panels, cables, fuses, switches, overvoltage arresters and power inverter. Photovoltaic panels utilise the power of sun light to converters photons to DC current. Electricity generated by solar panels is then fed into a power inverter that converts DC current to AC current. gPV fuse has been developed to protect cable and panel against "reverse" overcurrent. ETITEC B, C-PV series of over voltage surge protective devices has been developed to protect against direct and indirect lightning discharges and is intended to protect photovoltaic systems. The circuit topology consists of two varistors stages each protected by a thermal disconnection device. Overcurrent protection Array with three or more strings of panels: PV systems that have three or more strings connected in parallel need to have each string protected by fuses. Systems that have less than three strings will not generate enought fault current to damage the conductors/solar panels. Normaly there are two gPV fuses connected on each string ( + and - pole ), that protect conductors/solar panels from damage and eliminate any safety hazards. Fuses isolate the faulted string. The rest of PV system can continue to generate electricity. Ci CD CD n "t3 O (—»■ CD r> n 11 •