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Regarding the performance of lightning protection products, IEC, IEEE and relevant Chinese standards organizations have put forward performance requirements and test methods in lightning protection product related standards for low voltage distribution systems. Classification impact test for lightning protection products, domestic Usually only a few lightning protection product testing centers have testing capabilities. For most lightning protection product inspection agencies, the selection and use of lightning protection products in lightning protection engineering should be reasonable according to the nominal parameters of the products. The international standard IEC 61643-1 requires lightning protection products to be selected according to the lightning protection level; Class I lightning protection products are required to prevent direct lightning strikes and can be installed at the line entrance; Class II lightning protection products can be installed at the partial end of the building; Class III lightning protection The product is usually installed on the equipment side. It should be noted that the lightning current waveform should be clarified when selecting the lightning protection product discharge current. If the Iimp of a 10/350 us lightning current waveform is equal to the In value of an 8/20 5s lightning current waveform, the former's current capacity can be It is several times the latter.
Signal lightning arrester test method:
(1) Generally test the line ground, if necessary, test the line. For multi-channel input and output lightning protection products, randomly select a loop for testing.
(2) Apply 8/20 us current shock waveform of nominal tolerance to the input end of lightning protection products, positive and negative polarity 5 times each, each impact interval is 3 min, and the output side is disabled. Press Ures, this residual pressure value is only used to indicate
The protection stability of 10 impacts, such as no waveform abrupt change, residual voltage instability, etc., can be used to determine the level of voltage protection.