Selection and installation of lightning protection device

Selection and installation of lightning protection device

1. Foreword   With the increasing application of electronic information products, the application of lightning protection products is also becoming more and more popular. Due to the lack of correct understanding of some important parameters of lightning protection devices by some users of lightning protection devices, many problems have appeared in the selection and use of lightning […]

The history of lightning protection

The history of lightning protection

Thunder and lightning disasters exist in ancient times. Thunder and lightning, a difficulty that has been “overcomed” by us, is suddenly injected with new vitality. While feeling technology, we also taste a lot of sudden helplessness and troubles. With the development of modern science and technology, computer technology (Computer), control technology (Control), communication technology (Communication), display […]

High-definition electronic police system lightning protection scheme

High-definition electronic police system lightning protection scheme 1. Harm of   lightning strikes Lightning strikes are one of the serious natural disasters. With the continuous development of modern communication technology, increasingly busy and complex affairs can be organized in order through computers, networks and communication equipment, but the working voltage of these sensitive electronic equipment is constantly changing. Decrease, their number and scale continue to expand, so the possibility of them being damaged by overvoltage, especially thunder and lightning, is greatly increased. The consequences are not only direct damage to the equipment, but also may interrupt the operation of the entire system and cause difficulties. Estimated economic loss. Therefore, lightning protection of equipment has become an urgent need. Second, the classification lightning   lightning is generally divided into direct lightning and lightning.   Direct lightning refers to: lightning strikes directly on buildings, structures, trees, animals and plants, and directly destroys buildings and structures and causes casualties due to electric and thermal effects.   Inductive lightning refers to the discharge between thunderclouds or between thunderclouds and the ground, which generates induced voltage on nearby overhead lines, buried lines, metal pipelines or similar conductors, and this voltage is transmitted to the equipment through the conductors, resulting in a network Large area damage to system equipment. Third, the intrusion passage of lightning   lightning invasion network equipment, mainly in the following four ways:   (1) direct lightning stroke by lightning receptor is directly into the ground, resulting in the net lift near ground, caused by the introduction of high voltage equipment grounding conductor Potential counterattack.   (2) When the lightning current enters the ground through the down conductor, the high current rate of change generates a strong magnetic field around the down conductor, causing the surrounding equipment to induce overvoltage.   (3) The power line or video line, RS485 pan/tilt control line that enters and exits the monitoring center is directly struck by lightning or induced lightning outside the building, and overvoltage and overcurrent enter along the line to invade the equipment.   (4) Into the power supply, pan-tilt control, and video lines of the outdoor camera, the induced lightning current intrudes into the camera and damages the camera. Fourth, the comprehensive lightning protection system   With the continuous development of modern electronic technology, the power lines, signal lines, and antenna feeders of communication equipment are easily damaged by lightning strikes. In general, lightning strike protection is divided into external protection and internal protection, which are also called lightning strikes. The classification of protection.   (1) External protection: It is composed of air-termination device, down conductor and grounding device, mainly used for the protection installation of direct lightning strike.   (2) Internal protection: It is composed of equipotential bonding system, shared grounding system, shielding system, integrated wiring and SPD, mainly used for lightning electromagnetic pulse protection. 5. Direct lightning protection   (1) A lightning rod should be installed above the pole of the outdoor camera, and the camera should be within the protection range of the lightning rod.   (2) The camera installed with the help of buildings should be within the protection range of the building lightning rod or other lightning protection device. If the building lightning protection device cannot be used for protection, the lightning rod should be installed on the monitoring pole as an air-termination device, and the air-termination device should be nearby. Grounded by the lightning protection belt and lightning protection net of the building.   (3) Small lightning rods should be round steel or steel pipes. When round steel is used, the diameter should not be less than 16mm; when steel pipes are used, the diameter should not be less than 25mm, and the thickness of the steel pipe wall should not be less than 2.5mm. The tip of the lightning rod should be 1m higher than the top of the antenna.   (4) grounded lightning down conductor should be galvanized or round cross-sectional area of not less than 8mm in diameter is not less than 48mm² of six, lightning protection   outdoor camera is LPZ1 area, vulnerable to an overcurrent induced by power supply cable Intrusion into the camera, the focus of protection is the power supply, while the camera's power supply, network and other lines must be considered comprehensively.   1. Outdoor monitoring power supply system protection   (1) Outdoor monitoring power supply system general protection: Outdoor cameras and fiber optic transceivers use many integrated circuits and sophisticated components. The breakdown voltage of these devices is often only tens of volts, and the maximum allowable operating power is only mA level. If the third level of lightning protection is not implemented, the breakdown voltage of these devices is only tens of volts. After the power line surge reaches thousands of volts, this will cause a great impact on the outdoor surveillance camera and cause damage to the camera.   Install Opelei Class I lightning protection device PB15-385/B+C/2, 15kA (10/350μs) here, which can effectively limit the residual voltage to within kV. This level of lightning protection device is installed in parallel, and the rear The power of the connected equipment is not limited.   (2) Outdoor monitoring power supply system power terminal protection:   Install Ou Pele II power lightning protection device PD20-275/2, 10kA (8/20μs) in the outdoor monitoring box, as the power terminal protection of the monitoring power supply system.   2, outdoor camera comprehensive protection   currently using network cameras mainstream high-definition cameras, here you need to install the power control network EU spectrum Ray triple mine SN-3/24.

1. Harm of    lightning strikes Lightning strikes are one of the serious natural disasters. With the continuous development of modern communication technology, increasingly busy and complex affairs can be organized in order through computers, networks and communication equipment, but the working voltage of these sensitive electronic equipment is constantly changing. Decrease, their number and scale […]

Comprehensive lightning protection design scheme for expressways

Comprehensive lightning protection design scheme for expressways

I. Overview   of lightning is one of the ten most serious natural disaster, “the United Nations International Decade,” published. The latest statistics show that the losses caused by lightning have risen to the third place among natural disasters. For the top 1,000 companies in the United States, each company loses an average of US$200,000 per year due […]

Lightning protection for intelligent building electronic systems

Lightning protection for intelligent building electronic systems

I. Overview   With the rapid development of information technology, intelligent building construction to the development of automation, information technology and energy-saving direction, microelectronic applications for the new technology represents technology has penetrated into all application areas of intelligent building and growing . There are many and complex microelectronic devices in buildings. These microelectronic devices are usually […]

Lightning protection solutions for car gas stations

Lightning protection solutions for car gas stations

I. Overview   With the rapid development of China’s economy, the cause is the rapid transportation, the life of the people living continues to improve, more and more cars, motor vehicle service stations this public service facilities to whom the provision of energy is also increasing rapidly. Gas stations play an important role in the transportation construction […]

Power system lightning protection and grounding lightning protection scheme

Power system lightning protection and grounding lightning protection scheme

Lightning protection for power systems is an important protection measure for power supply and distribution projects. If a lightning strike occurs, it will cause a large-scale blackout, which will seriously affect social production and people’s lives. The lightning protection of the power supply and distribution system should be carefully considered from the engineering design stage, and […]

Lightning protection solution for network monitoring system

Lightning protection solution for network monitoring system

1. Overview With the development and progress of society and the continuous improvement of people’s living standards, the social economy has become more and more active, and the demand for “safety” has become higher and higher. Security monitoring systems have been widely used. It is more and more common in various industries such as highways, financial […]

Video surveillance system lightning protection solution

Video surveillance system lightning protection solution

Lightning protection design plan  (1) Direct lightning protection design  General lightning rods that can protect the camera should be installed on the top of the outdoor camera support pole , and the corresponding grounding network should be grounded (the grounding resistance is required to be less than 10 ohms); there should be anti-direct strikes in the monitoring building Lightning protection (belt, […]