With the progress of society and the development of new and high technologies, various kinds of information equipment, precision instruments, electronic computers and data network equipment have been increasingly used in petrochemical enterprises. Lightning protection for these devices will also be the focus of protection for petrochemical companies.

Why do we need to increase the lightning protection in the petrochemical industry? On the one hand, the application of these devices in the petrochemical industry has greatly advanced the modernization process and promoted the development of the petrochemical industry. On the other hand, the electronic equipment used in the petrochemical industry has been over-voltage tolerated. Poor capacity and low dielectric strength make these electronic devices vulnerable to lightning strikes. As the petrochemical industry suffers a yearly lightning surge, the destructive power is huge, and the petrochemical industry is inflammable and explosive. Diffusion products, once lightning strikes, the danger can be imagined. In order to avoid the interruption of the operation of electronic equipment caused by lightning strikes and even lead to permanent damage, it is particularly important to increase the lightning protection of petrochemicals.

First, the harm of thunder and lightning to the petrochemical industry (1) Lightning currents generated during lightning strikes will produce extremely high thermal effects, which can easily lead to the vaporization or melting of metal wires to form a short circuit in the power system, which in turn causes fire or explosion;

(2) The lightning current also induces an alternating magnetic field around the strike point, which induces induced currents on the line, causing local overheating of electrical equipment or the formation of spark discharges resulting in fire.

(3) Lightning strikes can cause a large number of charges that are opposite to those of lightning to be induced by the hit metal equipment, which can easily lead to spark discharge and cause hidden troubles.

(4) The electromagnetic radiation formed by the discharge of lightning currents or cumulonimbus clouds will disturb or destroy the circuits and electronic equipment of the control system in the petrochemical control room through coupling;

Second, lightning protection measures for petrochemical industry:

(1) Overhead grounded metal conductors, such as lightning rods and lightning protection strips, shall be installed on the top and side of the building to prevent direct lightning strike damage.

(2) The shunt-connected air-termination device intercepts the lightning (after receiving lightning), and directs the lightning to the lightning current and divides the multi-channel guidance into the earth, so that the lightning current of each branch can induce the voltage on the nearby conductors or wires and cables. Reduced current.

(3) Equalizing (equipotential bonding)

Adjacent metal conductors adjacent to each other are connected to each other by a conductor and grounded so that the voltages on the conductors are equal and equal to each other. This prevents lightning sparks from counteracting each other and prevents maintenance personnel from touching adjacent conductors to generate electric shocks and protect personal equipment.

(4) Grounding Grounding is an important part of lightning protection. It includes the connection between the grounding electrode and the grounding electrode, the grounding tape, and the grounding lead of each grounding device. From the viewpoint of lightning protection and safety, the lower the grounding resistance of the grounding system is, the better, but the excessively low grounding resistance is consumed. A lot of manpower and financial resources. General requirements for ground resistance value is not more than 10 ohms.

(5) Electromagnetic blockade To prevent surges transmitted from the AC power supply lines and information system network transmission lines, damage the equipment and endanger the safety of personnel, the external transmission lines and cables shall be laid with closed metal conduits or metal conduits. Reliable and appropriate multi-point grounding of the metal trunking and threaded metal pipes to minimize the risk of equipment damage caused by lightning induced lightning.

(6) Reasonable wiring When the lightning current that receives the lightning leaks into the ground along the diversion lead line, due to the electromagnetic coupling effect, a voltage or current is induced on the nearby conductors (wires and cables). Abbreviation power surge. In order to reduce the surge on the wire and cable, try to stay away from the lightning deflector when laying out the power and signal cables.

Third, install the SPD (surge protector)

Although we have taken the above-mentioned six measures for lightning protection, on the power supply line, the phenomenon of surges and electronic equipment will continue to occur on the information system transmission line. The information system is now widely used in monitoring and management of petrochemical enterprises. Among them, such as automatic monitoring of pressure, flow, temperature, industrial television monitoring, fire alarm and other applications. Therefore, in order to protect the power supply and information system equipment, surge protection devices should be installed at appropriate locations such as the incoming terminal of the connection line, the vicinity of the device, and the lightning protection zone to ensure the safety of electronic devices.

Kejia Electric reminds: The lightning protection work in the petrochemical industry can not be ignored. For the power system, select the power lightning protector for layer discharge to ensure the safety of the power supply equipment. For signal line protection, select the corresponding signal lightning protection device. Protection is performed, in which signal lightning protectors include: video signal lightning protectors, network signal lightning protectors, antenna signal lightning protectors, and combined signal lightning protectors, and the like. In the selection of lightning protection devices, they must be purchased by regular manufacturers to ensure effective lightning protection in practical applications.

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