The gas discharge tube is a gap-type lightning protection component, which has been widely used in the lightning protection of communication systems. Discharge tubes are often used in the first or the first two stages of multi-level protection circuits to discharge lightning instantaneous overcurrents and limit overvoltages. Because the insulation resistance between the discharge tubes is very large, the parasitic capacitance is very small, which is very important for high frequency. Lightning protection of signal lines has the advantage of Ming silicon. The main shortcomings of the protection characteristics of the discharge tube are that its discharge time delay is large, and the action sensitivity is not ideal. It is difficult to effectively suppress the lightning wave with a steep rise of the wave head. There is a freewheeling problem in the lightning protection of the power system.
The role of gas discharge tube in surgeThe surge protection system required by the automatic control system is generally composed of two or three levels, and reliable protection can be achieved by using the characteristics of various surge suppression devices.
The gas discharge tube is generally placed at the input end of the line as a first-level surge protection device, which can withstand large surge currents.
The secondary protection device uses a varistor, which responds faster in the microsecond time range.
For highly sensitive electronic circuits, a three-level protection device TVS can be used to respond to the surge voltage within the ps-level time range.
When a surge such as thunder and lightning arrives, the TVS starts first, and it will accurately control the instantaneous overvoltage at a certain level; if the surge current is large, the varistor will start and discharge a certain surge current; the voltage at both ends will be The increase until the discharge of the front-stage gas discharge tube is promoted, and the large current is discharged to the ground.
The role of ceramic gas discharge tubeIn the past, in rural areas, power was cut off every time there was a thunderstorm. In addition to avoiding circuit damage caused by thunder and lightning, it also avoided many people who were not aware of lightning protection. But now, no matter what the weather is, except for power outages caused by circuit repairs, there will be no power outages in thunder and lightning weather. Why? It is because of the existence of lightning protection devices. When the functions of various lightning protection, anti-static, overvoltage and overcurrent protection devices are gradually recognized, they begin to act on a large area in actual circuit protection. What is the ceramic gas for lightning protection devices? How does the discharge tube act on circuit protection?
We all know that when lightning strikes a power line, the lightning current must pass through the power line to leak into the earth. Even if the lightning does not hit the power line, when the lightning strike occurs, the charge of the opposite sign induced on the wire loses its restraint, and the two wires flow. These currents invade the substation or attack electrical equipment through the line, forming an overvoltage on the equipment. When the overvoltage is higher than the rated lightning impulse withstand voltage of the equipment, the equipment will be damaged. Connect the ceramic gas discharge tube in parallel in the circuit. When the voltage applied to the two electrode ends reaches the breakdown of the gas in the gas discharge tube, the gas discharge tube begins to discharge, changing from high impedance to low impedance, and the surge voltage is quickly short-circuited to The voltage is close to zero and the overcurrent is released into the ground, thereby protecting the subsequent circuit.
Ceramic gas discharge tubes are often used in the first or first two stages of multi-level protection circuits to discharge lightning transient overcurrents and limit overvoltages. The discharge tube plays a protective role by limiting the voltage to a lower level. Ceramic gas discharge tube is currently the most widely used lightning protection device, whether it is lightning protection for AC and DC power supplies or lightning protection for various signals, it can play a good role in protection.
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