The application of Surge protective device

Update date:2018-01-07 Source:maxge

The lightning disaster has been confirmed by the United Nations as one of the world's worst natural disasters. In the 21st century, humans entered the electronic age, and the way of lightning disaster has changed very much. Due to lightning current along the lightning rod, downlead flow into the eve of the process, in its surrounding of pulse electromagnetic fields, or into the ground current of high potential difference in return, etc., within the buildings on some sensitive low voltage equipment, light affecting the normal operation of the system, or burning equipment.

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In recent years, the greenhouse effect made right the weather gets hot, followed by the extension of the thunderstorm season, also with the eve of the lightning accident rises, the original direct lightning protection, the lightning rod is not enough. Because of the lightning rod, lightning current along the line, the introduction of flow into the land of the eve of the process, will occur in its surrounding of pulse electromagnetic fields, or into the current formation of the potential difference of return, etc., within the buildings on some sensitive low voltage equipment, light affecting the normal operation of the system, or burning equipment. This is called surge lightning.

Power line is one of the important channels of lightning invasion of electronic equipment, the main way of attack power line lightning far point, near point of the thunder and lightning attack power line lightning and the lightning troubles fault phase (also known as the secondary damage of thunder and lightning). In the case of electronic watches, the low pressure level of the electronic watch can be easily broken. Therefore, it is necessary to adopt the electric surge protection technique to solve the lightning surge.

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Under the normal transmission of power transmission line, the surge protection device of high resistance, namely between transmission line and ground wire is in open state, for the normal operation of the normal power transmission and power equipment does not have any effect. When the power supply for ray waves on a transmission line, industrial surge and transient causes and form instantaneous over voltage, surge protection device in a very short period of time (25 ns) or less quick to conduction even short circuit, the lightning current drain in the eve of the ground, via a transmission line voltage is being in power equipment can withstand the peace of values, cause the protection of electronic equipment and other electrical equipment from the impact of the high voltage surge, ensure safe. After the lightning current, the surge shield is rapidly restored and the power transmission line is restored to normal transmission, thus making the equipment normal operation.

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It can be used to inhibit the transmission of electric wave and industrial surge in power transmission line, and it has excellent lightning protection function. Such as with air switch and fuse multiple over-current protection function of surge protection device, when the power supply for ray waves on a transmission line, industrial surge when New Year's day night, causing serious short circuit, air switch and fuse can have twofold over-current protection, to ensure normal power of power grid.

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The surge protector is the oxide pressure-sensitive resistor chip, which is faster than the low voltage surge arrester. It is equipped with the self-fault detection function of lightning proof assembly, and the lightning protection effect is better than the low voltage surge arrester.


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