Pulse electronic fence perimeter prevention alarm system is generally composed of three parts: pulse master, front-end fence with pulsed high-voltage signal, linkage alarm (optional part). The pulsed electronic fence system is mainly based on blocking deterrence. It also has short-circuit, short-circuit and host failure alarm functions. Because the front-end fence of the system is a physical physical barrier with high-voltage pulse signals, it not only hinders the intruder, but also has a great sense of psychological deterrence, which increases the opportunity cost of the intruder crossing the perimeter fence.
1 Overview
With modern people's requirements for security, it is a trend to design the perimeter of the pulse electronic fence to prevent the alarm system in the perimeter.
2. The principle of system composition
Pulse electronic fence perimeter prevention alarm system is generally composed of three parts: pulse master, front-end fence with pulsed high-voltage signal, linkage alarm (optional part). After the pulse master is energized, a pulsed high-voltage signal is output to the front end fence, and a pulsed high-voltage signal is transmitted back to the receiving end of the pulse master after forming a loop on the front end fence. When someone invades or destroys the front end fence or the work is abnormal (failure, cut off the power supply), the pulse host linkage alarm interface will output an alarm signal to the management center's security linkage equipment (such as the central alarm host, monitoring system, sound and light alarm, etc. ).
The pulsed electronic fence system is mainly based on blocking deterrence. It also has short-circuit, short-circuit and host failure alarm functions. Because the front-end fence of the system is a physical physical barrier with high-voltage pulse signals, it not only hinders the intruder, but also has a great sense of psychological deterrence, which increases the opportunity cost of the intruder crossing the perimeter fence.
The system has basically no false alarms. The system is basically not affected by the weather, terrain, small animals, plant foliage, etc. The front fence is a visible fence that can be installed along with the terrain. It can be no blind area and no dead ends. Ps: The pulsed high-voltage signal output from the pulse master is of low energy and low frequency, and is harmless to the human body.
3. System design ideas
Combining the technical features of the security facilities and considering the overall management of the intelligent system, we designed a pulsed electronic fence detector to be set up on the fence built on the perimeter to protect it, and the center will set up an alarm receiving host and other equipment to form a perimeter perimeter alarm system. The front-end equipment is mainly an electronic fence. The electronic fence system is a kind of "visible" alarm system, which gives a deterrent feeling to the intruder, adding a kind of psychological pressure to the system and combining the alarm system and the alert system organically. It is the purpose of prevention and prevention. The electronic pulse scans every wire of the electronic wall 60 times per minute and each pulse has a peak of 0.7-10 kilovolts, making it difficult for intruders to climb. In addition, if the system encounters a broken circuit or a short circuit, the touch screen system will send an alarm signal. It can also be used in conjunction with any alarm system for ease of protection.
4. System characteristics
(1) Blocking function: The intruder is shocked by a pulsed high-voltage signal on the front-end fence wire of the system to make it abandon the intrusion attempt and achieve blocking function. The host adopts a dual-polarization design, which can achieve the electric shock blocking function for each pulsed electronic fence wire, and increase the actual blocking effect.
(2) Deterrence function: The pulsed high-voltage signal has a direct deterrent effect on normal people. After the intruder is electrocuted, it will also form a psychological barrier, thus achieving deterrence effects and effectively reducing intrusion attempts.
(3) Low false alarm rate: The principle of pulse master alarm is fundamentally different from traditional infrared radio and sensor alarm methods. There are disconnection, short circuit (short circuit between adjacent fence lines, short circuit to ground), failure alarm mode, and host computer. Built-in common false positives exclusion method, basically not affected by weather, terrain, small animals, plants, leaves and other false alarm.
(4) It can be used as a system or it can be used in linkage: The pulse electronic fence can be used alone or integrated with other security systems to achieve linkage.
(5) Flexible design and easy installation: The pulsed electronic fence on the front of the system is used as a physical physical barrier. It can be attached to existing perimeter walls (or fences) or can be installed on the ground independently. The pulsed electronic fence can be installed either vertically or at an inclined angle to provide a wider physical barrier to prevent intruders from invading by climbing and destroying. The height of the pulsed electronic fence and the length of the guard zone can all be designed and installed according to the perimeter terrain requirements.
(6) No dead zone, no dead corner: Since the fence at the front of the system can be installed arbitrarily along with the terrain, dead corners and blind spots will not be formed.
(7) Safe and reliable: The pulsed electronic fence is fundamentally different from the traditional AC grid. The low-energy (up to 5 Joules) and low-frequency (about 1HZ) pulsed high-voltage signals (5KV to 8KV) of the pulsed host output meet the national standards and are not sufficient. It is safe to physically injure the human body. The front pole of the system adopts a flexible PV rod and a special alloy wire as its middle support rod. It cannot withstand the weight of the human body, can normally sense the occurrence of intrusion, and promptly send an alarm signal to ensure the reliability of the pulsed electronic fence system.
(8) High protection efficiency: First, the system's false alarm rate is extremely low, it will not affect the normal working order due to false frequency alarms, and secondly, blocking the deterrence function can effectively reduce intrusion attempts, and thirdly, due to the blockage of pulsed electronic fences. The role of the system is to send an alarm signal before the intruder crosses the pulse electronic fence, instead of delaying the invasion time after the invader, so that security guards can arrive at the scene in time. Therefore, the pulsed electronic fence system has better protection efficiency.
5. System equipment
1, the front fence. Front-end protection fences include: support rods, insulators, alloy wires, unlicensed shoes, universal fixed bases, lightning arresters and other equipment. Front-end fence can be selected according to the site conditions, a suitable type of erection force, can be erected on the rails along the original side of the protective fence, and can be floor-mounted.
2, high-voltage pulse detectors. The detectors are installed near the front protective fence, and the maximum protection area for each detector is 1km. The internal 485 module has a transmission distance of 8km. It can receive/send remote setting data, zone alarm data under the terminal detector, and real-time monitoring data of equipment operation.
3 Center equipment.
(1) Alarm host equipment: The two-wire bus system address code method is used instead of the traditional splitter loop mode, which can be expanded to 248 defense areas.
(2) Bus driver: Used to connect to a control/communications host. It is directly mounted on the motherboard and provides two two-wire buses. Each bus can connect up to a total of 120 bus detectors and interface modules.
(3) 32 relay relay output modules: The relay output module is a subsidiary product of the alarm host. Each relay output module has 32 relay output ports. Whenever the front end of the host generates an alarm, the output module can be set according to the internal settings. One-to-one, one-to-many, or multiple-to-one relay alarm outputs are implemented.
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