Lightning is not terrible, lightning protection device selection method

Release time:

2018/09/30

Lightning is not terrible, lightning protection device selection method

As we all know, lightning is extremely destructive, with voltages as high as millions of volts and instantaneous currents as high as hundreds of thousands of amperes. In the face of lightning attacks, most people are helpless and have insufficient awareness of lightning protection products.,There are many problems in dealing with lightning attack.

Experts remind that lightning will not only cause equipment damage and affect the service life of components, but also lead to the loss of stored signals or data. In serious cases, it will lead to casualties or fire accidents. Nowadays, lightning activities are becoming more and more frequent. In order to better ensure the safety of work and life, the installation of lightning protection devices has become a necessary means to prevent lightning infringement. If it is not implemented, the consequences are really unpredictable, so how to choose lightning protection?

If you want to make the lightning protection device to play a good protective effect, you need to install the appropriate lightning protection device in the right place, so the lightning protection device is very important in the choice.

1. power lightning protection device

According to statistics, about 80% of the accidents of lightning damage to electronic equipment are introduced by the power supply. Lightning can be input into the room from the power line. Indoor electronic equipment will be attacked by direct lightning and induction lightning, which will cause a devastating blow to the power supply system. Therefore, the lightning protection measures of power supply system equipment should be specially strengthened.

In the purchase of power lightning protection device should choose a small residual voltage, fast response time of lightning arrester, at the same time according to the electronic equipment in the lightning activity area of the surge intensity, equipment on the lightning surge exposure degree and equipment protection degree, value and other principles of power lightning protection device level selection.

The first level of lightning protection can be applied to the main power distribution cabinet in the building; the second level of lightning protection is applied to the branch power distribution cabinet of the building; the third level of lightning protection is applied to the front end of important equipment, which can be used for precision protection of equipment, so different levels of lightning protection can be selected according to different types of power equipment.

2. signal lightning protection device

There are many applications of signal lightning protection devices, such as telephone signals, network signals, video signals, analog signals, digital signals, control signals, combined signals, etc. When these signal lines are struck by lightning, they will induce overvoltage of thousands of volts, damage the microelectronic equipment connected to the line, and invade other communication lines through the equipment connection. Such intrusion spreads along the communication line, involving a wide range of areas and causing great harm. If the signal lightning protection device is installed before, and the energy generated by the induced lightning is discharged to the earth, these dangers will be eliminated to ensure the safety of communication equipment.

In the signal lightning protection device selection, the signal lightning protection device is installed in series on the line, not only to consider whether the lightning protection device plays a role in lightning protection for the signal line, but also to consider the matching problem between the lightning protection device and the communication line. Therefore, rate matching, voltage level, interface type, insertion loss, etc. are all factors that need to be considered in the selection of the signal lightning protection device.

Selection one: the choice of rate matching

The data transmission rate of different communication systems is different. The signal lightning protection device is installed on the signal line, and the transmission rate supported by it should not be less than the transmission rate of the communication system itself, otherwise it will cause communication interruption or error rate increase. Affect the normal operation of the communication system.

When there is a communication interruption or an increase in the bit error rate, the user can check whether the length of the communication line is too long, wherein the number of power outages, the connection quality and whether the communication connector is fastened may also be the cause of the increase in the bit error rate.

Selection II: voltage level selection

The voltage level selection of the signal lightning protection device should be determined according to the working voltage of the communication line data transmission. It is an important parameter for selecting the signal lightning protection device, in which the maximum working voltage of the lightning protection device must be greater than 1.2 times of the working voltage of the communication line.

Selection three: the choice of interface type

The signal lightning protection device is installed on the line in series. In order to match the impedance and maintain the minimum contact resistance, the same type of interface as the communication line should be selected. For RJ and SD type interfaces, attention should be paid to line pair coordination, and for coaxial cable interfaces, attention should be paid to male and female coordination.

Selection four: insertion loss

The signal lightning protection device is installed on the signal line, because of its additional capacitance, in the case of high frequency, there will be a certain insertion loss. When selecting a signal lightning protection device, its insertion loss should be less than the value specified in the relevant standard.

At present, lightning protection devices have been widely used in power, electronics, communications, security, family and other fields. Lightning protection devices will eventually become an indispensable lightning protection tool for society to ensure the safety of life and property.

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