(1) The DC discharge voltage of the gas discharge tube must be higher than the maximum voltage of the line during normal operation, so as not to affect the normal operation of the line.
(2) The pulse discharge voltage of the gas discharge tube must be lower than the highest instantaneous voltage value that the line can withstand, in order to ensure that the gas discharge tube can respond faster than the line when the transient overvoltage occurs, and limit the overvoltage to a safe value in advance .
(3) The holding voltage of the gas discharge tube should be as high as possible. Once the overvoltage disappears, the gas discharge tube can be extinguished in time without affecting the normal operation of the line.
(4) The grounding wire should be as short as possible and thick enough to facilitate the discharge of large transient currents.
(5) If the overvoltage lasts for too long, the gas discharge tube will generate a lot of heat. In order to prevent damage to the protected equipment due to overheating, the gas discharge tube should be equipped with a fail-safe card device. Nowadays, some new gas discharge tube products have fail-safe cards.
Precautions for gas discharge tube selection1. The addition of the gas discharge tube should not affect the normal operation of the line. This must ensure that the lower limit of the DC breakdown voltage of the gas discharge tube must be higher than the maximum normal working voltage of the line. Based on this, determine the nominal discharge tube required DC breakdown voltage value.
2. When the overvoltage disappears, ensure that the discharge tube is extinguished in time to avoid affecting the normal operation of the line. This requires the over-holding voltage of the discharge tube to be as high as possible to ensure that the normal line operating voltage will not cause the continuous conduction of the discharge tube (ie, the freewheeling problem).
3. If the overvoltage lasts for a long time, the long-term operation of the gas discharge tube will generate high heat. In order to prevent damage to the protection equipment or terminal equipment caused by the heat and to prevent any possible fire, the gas discharge tube must be equipped with an appropriate short-circuit device at this time, which is called FS device, also called failure protection device;
4. Determine the highest instantaneous voltage value that the line can withstand, and ensure that the impulse breakdown voltage value of the discharge tube must be lower than this value. In order to ensure that when the instantaneous overvoltage comes, the response speed of the discharge tube is faster than the response speed of the line, and the overvoltage is limited to a safe value in the first step.
5. According to the inrush current intensity that may enter the line, determine the inrush current withstand capability that the selected discharge tube must achieve (for example: generally select 10kA or more in the outdoor; generally use 5kA at the entrance end; generally use at the equipment terminal About 2kA level).
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Customized contents:
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• IP rating optional
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