Lightning protection device selection principle

In the forest fire protection and lightning protection, school lightning protection engineering, ancient building lightning protection engineering how to use lightning protection device partition lightning protection theory advantages:

Divisional lightning protection theory has proved to be reasonable and effective. The basic idea of ​​this theory is to progressively reduce it to a harmless level before it reaches the terminal equipment and causes damage. In order to achieve this goal, the entire protection space of the building is divided into several lightning protection subzones. In the interface between the two lightning protection zones, all metal objects passing through the interface should be equipotentially connected, and shielding measures should be taken. Online routing Install a lightning arrester at a place where one partition enters another partition, and install lightning arresters of corresponding grades according to the specific requirements of different partitions.

Signal lightning protection device selection principle:

The lightning protection device of the communication line is installed in series on the line. Therefore, when selecting the lightning protection device, it must be ensured that the lightning protection device can play a protective role. At the same time, the matching problem between the lightning protection device and the communication line must also be considered, so the lightning protection device is selected. The main considerations in the model:

1. Selection of voltage level 2. Selection of rate matching 3. Selection of interface type Power supply lightning arrester selection principle:

Grade requirements

Features

Maximum protection level voltage

WJA lightning arrester

B

Lightning protection device for protection against direct lightning or near lightning strike

Primary protection

I (4KV)

WJA380-100

WJA380-80

WJA220-100

WJA220-80

C

Lightning protection or lightning protection device for generating overvoltage in the power supply network

Intermediate protection

II (2.5KV)

WJA380-60

WJA220-60

D

Lightning arrester for protective terminal power equipment

Fine protection

III (1.5KV)

WJA380-40

WJA380-20

WJA220-40

WJA220-20

In forest fire protection and lightning protection, school lightning protection engineering, ancient buildings lightning protection project how to use lightning protection device

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