Working principle of hail impact testing machine

author: Source

Hail impact testing machine is mainly used to verify the ability of anti hail impact of components. The artificial hail ball is used to simulate hail and impact components with constant speed to simulate the impact of hail climate on components. It is of great significance to major equipment manufacturers, so what is the working principle of Hail Impact Tester.

The working principle of hailstone impact testing machine is that the air is compressed to the air storage tank by the air compressor, the external pressure gauge and the 25 mm inner diameter gun barrel are connected, an air valve is installed at the connection, and the opening is controlled by the large solenoid valve. Then a photoelectric velocity measuring device is installed at the front end of the barrel. Adjust the pressure gauge to make the ice hockey reach the standard impact speed. The ice hockey mould with inner diameter of 25 mm was made. Put the made ice hockey in the barrel of the gun, open the solenoid valve, and the compressed air pushes the ice hockey to hit the PV module at a speed of 23m / s. After the components are hit by ice hockey, visual inspection, I-V test and insulation resistance test are conducted to determine whether the components are qualified.

After the hail, the smashed PV modules may suffer a lot of damage, some of which can be seen by the naked eye, and some of which are hidden inside the modules. So check the PV module. The methods to check the fault location of PV modules generally include using thermal imaging to lock the heating part, or using broken line detector to check the fault of broken line part and bypass diode, etc. Although these methods can lock the location of the fault, it is difficult to find out the status and cause of the fault. At this time, you can choose El inspection, which can not only lock the fault location in the solar panel, but also effectively determine the cause of the fault, such as PID deterioration, internal cracks, poor contact, diode fault, etc. in high temperature and humidity environment.

Therefore, after the hail, the photovoltaic system may be affected. After the modules are smashed, if there is a drop in power generation or other abnormal conditions, the photovoltaic system should be checked in time to see if it is really damaged. If necessary, it can be sent back to the original factory for testing, so as to replace the damaged modules in time.