Application of Technology to Attenuate Residual Voltage on Lightning Arrester for Lightning Protection of Secondary Equipment in Substation
Luo Ji-chang · 2007
In order to avoid destruction of secondary equipment by high residual voltage on the lightning arrester after discharge,neutralizing transformer has been developed to largely attenuate the residual voltage on the lightning arrester which would be far higher than the durability to lightning of secondary equipment.Experiment show that the neutralizing transformer can attenuate the residual voltage up to more than 90% to realize a reasonable coordination between the attenuated residual voltage of lightning arrester and lightning protection level of secondary equipment.It has also verified by operation experience that the application of neutralizing transformer greatly reduce the lightning failure rate of secondary equipment.Now this technology has been practically applied in many composite automation substations with fine effects.