Streamer Delaying Technology
The Streamer Delaying Air Terminals (SDT) are developed based on The Charge Transfer System (CTS) was recently developed to reduce the likelihood of lightning strike directly to the premises. Its idea of preventing lightning strikes is based on the point discharge phenomenon. Analysis of electric field of CTS was found to be 67[V/m], while for a Franklin Rod it was found to be 75[V/m]. The CTS devices were found to initiate ionization of air and hold a weaker electric field that prevents the formation of streamers.
It is generally understood that the presence and movement of space charges play a major role in lightning discharge formation and its propagation. Space charges ahead of the descending leader tip significantly contribute to such fundamental phenomenon as branching, the formation of leader steps as well as pauses between steps.
With extensive research and field testing, Streamer Delaying Air Terminals (SDT) were designed using stainless steel wire with less than 0.1mm diameter, appropriate wire length and geometry at the tip of the air terminal to operate as an IONIZER that has the capability to create stable streamer-free corona under a wide ambient field range.
The IONIZER of the SDT distributes the current at the tip of each stainless steel wire. Under negative cloud polarity, this results in ionization of the surrounding air and continuous release of positive ions. As the ionized air around the SDT starts to drift outwards and ionize adjacent molecules a shielding space charge cloud is created around the SDT air terminal. This shielding space charge is accompanied with a neutralization of the object on which the SDT Terminals are installed. A proper grounding system at the protected facility provides a very low resistance, and low impedance ground resistance, resulting in a quick space charge cloud formation with minimal voltage stress at the air terminal tip. When effectively bonded to the proper grounding system, the emission of streamers from the SDT and the neutralized object is greatly reduced. The SDT Terminals are installed in the same specified locations for conventional air terminals, and in accordance with NFPA 780 and IEC 62305.