Aspects on Lightning Protection and Testing in Low Voltage Circuit
Zhiqiang Liu · Insulators and Surge Arresters · 2007
Two components of lightning protection in low circuit: external and internal ones are briefing.It is pointed out that for testing surge protection device(SPD),the main lightning protection device in low voltage circuit,proper parameter for lightning protection and lightning wave-shape shall be selected.For external protection,wave-shape of 10/350 μs shall be used while that of 8/20 μs for internal protection.The connection behavior of SPD with connecting parts and the withstand current and follow current extinction capacity of SPD shall be considered carefully to prevent fire,proper wiring shall be made for enhancing precision of signal acquisition.The looping area of connecting wiring from measuring system to test object shall be reduced as possible.Selective surge arrester circuit shall be installed at input of all units with low channel filter for filtering transient pulses in order to eliminate source and space electromagnetic noise.Thus the measuring error can be eliminate as much as possible.