Because the photovoltaic power generation system will continue to generate electricity in the presence of light,it can not cut off the power supply,and the use of traditional fire extinguish-ing agents will cause electric shock accidents.In order to analyze the electric shock risk of high voltage DC side of photovoltaic power generation system with live extinguishing agent,a test plat-form and test method are proposed.Through the test,it can be found that:foam,water-based fire extinguishing agent,carbon di-oxide and other fire extinguishing agent in the DC side of 300～1 500 V high voltage,due to the insulation of the fire extinguishing agent,it cannot form a circuit and therefore lacks conductivity.Fire hydrant water gun and multi-functional water gun live rescue process gun head with DC voltage,the gun head voltage changes with the flow and distance,because the center of the water col-umn of the multi-functional water gun is air,significantly reduce the conductivity of the water column,multi-functional water gun than fire hydrant water gun is more suitable for fighting the photo-voltaic power generation system live fire.The calculation method of water conductivity of multi-functional water gun in the process of electricized rescue is obtained,and the safety distance of pri-mary and secondary electricized rescue of water gun is calculated and determined.In the live rescue process,the rescue distance must be strictly greater than the first-level safety rescue distance,and corresponding protective measures must be taken to prevent electric shock within the second-level rescue distance.
关键词
光伏发电系统/直流侧/带电扑救/触电危险/电导率
Key words
photovoltaic power generation system/DC high-voltage/electric rescue/electric shock risk/conductivity
维普
万方数据