LANG
5G
Lightning surge protection of AC power line - voltage circuit protection shall be made by using the combination circuit of varistor and ceramic gas discharge tube, preferably combined with the fuse device of short circuit and overload protection. It is necessary to pay attention to the characteristic that the service life of varistor will decay under multiple surge impact. The protective device with appropriate margin shall be selected according to the protection level of the protected circuit, so as to minimize the equipment failure caused by the damage of surge protector.
In the DC power line, TVs transient suppression diode can provide low clamping voltage value to protect the power supply equipment. TVs tube has the characteristics of reaction speed block, accurate clamping voltage and difficult performance attenuation
Overcurrent protection can be achieved by fuse device or recoverable fuse PTC. The data line may face the threat of surge, electric fast pulse and ESD. These lines carry higher frequency than power input and can work within a certain voltage range. Therefore, the corresponding protection requirements are more complex than power input applications.
Technical theory of lightning protection and overvoltage protection of communication system:
(1) The interface lightning protection is usually connected in series and parallel in the data line, and the selection should not affect the data transmission;
(2) According to the interface frequency, select the data interface protection lightning protection device with appropriate working bandwidth and physical interface, and minimize the loss when connecting with the data equipment interface, which will affect the signal transmission;
(3) For data equipment with high frequency, lightning protection design with inter electrode capacitance, leakage current, insertion loss, standing wave ratio as small as possible and response time as fast as possible shall be selected;
(4) According to different working voltages of signals, select appropriate data interface lightning protection with action voltage and limiting voltage;
(5) Select lightning protection with sufficient margin according to the lightning protection level requirements of equipment interface;
(6) Data lightning protection must have reliable grounding connection. The grounding wire shall be separated from the grounding wire of the protected data equipment as far as possible and connected reliably nearby. The cross section of the grounding wire shall not be less than 25 mm2
Outdoor equipment (and some equipment installed indoors) are exposed to the risk of lightning stroke, which may lead to surge of all connecting lines (including power line and data line). Current specifications for such surges include gr-1089, IEC 61000-4-5 and ieeec62 41 and ITU K 44/20/21/56。
Indoor equipment may be affected by electrostatic discharge (ESD) of human or other charged objects, which can enter the data line. IEC 61000-4-2 provides recommendations on application level ESD test methods.
Lightning surge protection of AC power line - voltage circuit protection shall be made by using the combination circuit of varistor and ceramic gas discharge tube, preferably combined with the fuse device of short circuit and overload protection. Under the condition that the surge protection level of the varistor is appropriate, the surge protection device can be attenuated to the maximum extent due to the surge protection characteristics.
In the DC power line, TVs transient suppression diode can provide low clamping voltage value to protect the power supply equipment. TVs tube has the characteristics of reaction speed block, accurate clamping voltage and difficult performance attenuation
Overcurrent protection can be achieved by fuse device or recoverable fuse PTC. The data line may face the threat of surge, electric fast pulse and ESD. These lines carry higher frequency than power input and can work within a certain voltage range. Therefore, the corresponding protection requirements are more complex than power input applications.
Lightning surge protection of AC power line - voltage circuit protection shall be made by using the combination circuit of varistor and ceramic gas discharge tube, preferably combined with the fuse device of short circuit and overload protection. It is necessary to pay attention to the characteristic that the service life of varistor will decay under multiple surge impact. The protective device with appropriate margin shall be selected according to the protection level of the protected circuit, so as to minimize the equipment failure caused by the damage of surge protector.
In the DC power line, TVs transient suppression diode can provide low clamping voltage value to protect the power supply equipment. TVs tube has the characteristics of reaction speed block, accurate clamping voltage and difficult performance attenuation
Overcurrent protection can be achieved by fuse device or recoverable fuse PTC. The data line may face the threat of surge, electric fast pulse and ESD. These lines carry higher frequency than power input and can work within a certain voltage range. Therefore, the corresponding protection requirements are more complex than power input applications.
Technical theory of lightning protection and overvoltage protection of communication system:
(1) The interface lightning protection is usually connected in series and parallel in the data line, and the selection should not affect the data transmission;
(2) According to the interface frequency, select the data interface protection lightning protection device with appropriate working bandwidth and physical interface, and minimize the loss when connecting with the data equipment interface, which will affect the signal transmission;
(3) For data equipment with high frequency, lightning protection design with inter electrode capacitance, leakage current, insertion loss, standing wave ratio as small as possible and response time as fast as possible shall be selected;
(4) According to different working voltages of signals, select appropriate data interface lightning protection with action voltage and limiting voltage;
(5) Select lightning protection with sufficient margin according to the lightning protection level requirements of equipment interface;
(6) Data lightning protection must have reliable grounding connection. The grounding wire shall be separated from the grounding wire of the protected data equipment as far as possible and connected reliably nearby. The cross section of the grounding wire shall not be less than 25 mm2
Outdoor equipment (and some equipment installed indoors) are exposed to the risk of lightning stroke, which may lead to surge of all connecting lines (including power line and data line). Current specifications for such surges include gr-1089, IEC 61000-4-5 and ieeec62 41 and ITU K 44/20/21/56。
Indoor equipment may be affected by electrostatic discharge (ESD) of human or other charged objects, which can enter the data line. IEC 61000-4-2 provides recommendations on application level ESD test methods.
Lightning surge protection of AC power line - voltage circuit protection shall be made by using the combination circuit of varistor and ceramic gas discharge tube, preferably combined with the fuse device of short circuit and overload protection. Under the condition that the surge protection level of the varistor is appropriate, the surge protection device can be attenuated to the maximum extent due to the surge protection characteristics.
In the DC power line, TVs transient suppression diode can provide low clamping voltage value to protect the power supply equipment. TVs tube has the characteristics of reaction speed block, accurate clamping voltage and difficult performance attenuation
Overcurrent protection can be achieved by fuse device or recoverable fuse PTC. The data line may face the threat of surge, electric fast pulse and ESD. These lines carry higher frequency than power input and can work within a certain voltage range. Therefore, the corresponding protection requirements are more complex than power input applications.