Gas discharge tube for launching antenna lightning lightning ----- Gaseous Discharge Tube Application

The ceramic gas discharge tube adopts a sealed package, which is filled into a suitable gas medium (argon or helium) in the discharge gap, and is equipped with a highly active electron emission material and the discharge ignition mechanism, which is a special metal ceramic structure. Discharge device. Under normal circumstances, the discharge tube is due to its unique high impedance (≥1000mΩ) and low capacitance (≤2pf) characteristics, there is almost no adverse effect on the normal operation of the line as a protective element in the access line. When the hazardous instantaneous overvoltage is blown, the discharge tube is first broken down. Its impedance declines rapidly, almost short-circuited. The harmful current is discharged through the ground, and the voltage is limited to the arc of the discharge tube (about 20 V), eliminating the harmful instantaneous overvoltage and overcurrent, thereby protecting the lines and elements, and after the overvoltage disappears, The discharge tube quickly returns to high impedance state, and the line will continue to work. The drawings are the connection diagrams of the arresters composed of the gas discharge tube and the medium wave broadcast transmitter output cable. The choice of gas discharge tube P is selected according to the power of the transmitter. The discharge tube selected for "Rated Voltage" is important. The rated voltage is too high, and the lightning resistance is not protected. The transmit power cannot be output; the capacitance C uses the accepted ceramic capacitance and consists of multiple capacitances, once individual capacitance is damaged It does not affect the output of the transmitter power. , It is also important to install the position of the arrester. The arresters composed of gas discharge tubes are connected in series in output feeder (coaxial cable), and the discharge tube is connected to the coaxial cable core and the other end is connected to the coaxial cable shield line (the shield line is grounded through the network system). Usually, the emission antenna is all installed with a discharge ball and a matching network. There is still a certain lightning protection design in matching network. Therefore, in order to effectively lightning, this arrester should be in the vicinity of the transmitter or the transmitter output directly load the arrester to the output cable, such as the end of the coaxial cable (before the antenna), the lightning protection effect is more it is good. The attached table is the gas discharge tube applied by the three transmitters. Author: Gao He He Schedule: Medium wave transmitter power 1kw 3kw 10kw Discharge tube rated voltage 1000V 1500V 2500V Capacitor C 10 223 / 2kV

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