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Some heat of summer on room mine awareness

  
lightning species


power line is an important channel for the lightning invasion, the power supply line of lightning struck the engine room there are three main ways, namely: Far point Lightning strikes, near-point lightning strikes, and wrong-phase lightning strikes.

1. Lightning far point: i.e. delivery of alternating current 50 Hz in accordance with the principles of the magneto-electric conversion power supply line, the line to generate an alternating magnetic field will produce high electric field breakdown atmospheric lightning, high voltage lightning The electric field moves toward the earth direction by the principle of electrostatic absorption. In the rainy weather, the air humidity increases, and at this time, the lightning is more likely to break through the air and enter the ground through the protection ground of the power line, thereby damaging the electrical equipment due to the higher voltage. To this end, lightning protection must first consider lightning strikes from afar.

2. lightning near point: lightning struck power lines near point is actually a lightning rod lightning struck the building where the electrical equipment, causing lightning electromagnetic pulse protection. The lightning rod down conductor can only introduce 50% of the current into the earth due to the inductance. More than 30 meters of the building body down the line can only lead to less current, the rest through the ground connected water pipes, power shielding slots and other joint lightning, of which 25% penetrate the UPS output load power line and LAN line, etc. After the device, enter the ground through the logic ground. This includes the input and output of the UPS to the ground terminal. To this end, UPS and important electrical equipment such as minicomputers, servers, etc. must be equipotentially protected to protect the network ports and block all lightning-introduced ports in order to effectively protect the equipment from lightning strikes.

3. Phase error lightning: a high energy of a lightning strike on the firing line, a low energy of a lightning strike on another line of fire, a pressure difference is generated between the wire lines, so that the secondary invasion of the device caused by lightning Lightning strikes a misplaced lightning strike. For this purpose, protection should also be installed on the input and output of the UPS.

4. lightning strike: Lightning lightning strike in the building, the bleed through the lightning down conductor, the current generates a magnetic field from top to bottom a fast rotational movement in the down conductor, thus by an electric Magnetic induction induces high voltage on the lines of the building to destroy the transmission equipment. Inductive lightning strike energy is small but its voltage is high, so the protective induction lightning should be fully protected, and the protection level can be slightly reduced.

Lightning network of lightning damage harm


WAN mainly from lightning sensors, usually without direct lightning damage, when subjected to high pressure due to WAN line lightning attacks, which It is first dissolved by itself. Therefore, protection-inductive lightning is the focus of lightning protection for wide area networks.

DDN telephone line and a backup line most vulnerable to lightning, lightning protection devices should be installed at the inlet end of such lines.

LAN While in the room, but due to low pressure device interface, combined with the line shielding, wiring distance, wiring and other factors, over-voltage surges induced by lightning can cause damage to the device through the network, local area network The RJ45 head is treated as a signal, and its protection should be treated as two pairs of lines.

the wiring cable from lightning angle should be clear requirements: a power line network and can not be laid with the groove line; WAN line to the LAN line can not set up with the groove. The cable installation should be kept at a certain distance from the wall. Install shielded slots outside the line for protection.

Lightning protection zone and equipotential bonding


According to the lightning pulse intensity of different regions, the lightning protection zone is divided, and the interface of different zones is equipotentially connected. The connected metal objects are directly connected. If they are not directly connected, such as power lines and communication lines, they must be scientifically partitioned, graded, and subsequently connected to equipotential bonding and with lightning protection equipment to ensure that the protective measures of the protected equipment are effective.

mine field region is generally defined as the lightning environment and control necessary to define an area, in a district to the junction of the electromagnetic environment without obvious change as divided into different areas of the lightning protection feature. Specifically, in the lightning protection of computer information systems that we intend to carry out, it is necessary to divide different lightning protection areas according to the space that the building where the computer information system is to be protected to determine the intensity of the lightning electromagnetic pulse in each lightning protection area space, thereby taking Specific protective measures and means.

mine priorities: between different regions of different magnetic strength of mine, first of all screening measures to prevent the intrusion of lightning electromagnetic pulses to a certain extent. On this basis, do a good job of protecting the different lines across the interface of the lightning protection zone.

Generally, comprehensive protection is implemented by means of Dividing, Bonding, Bonding, and shielding measures, namely DBSE technology. If this principle can be fully implemented in the early stage of lightning protection design, its protective effect will be more effective.
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