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Secure electronic fence in areas of high security and application

Since 2007，Perimeter high-pressure electronic fence has arisen quietly in Shanghai and broken the situation of previous infrared detector unify the whole country. This article simply describes the principle of electronic fence and the application status of Shanghai electronic fence, puts forward some existing problems in electronic fence system and optimal schemes.

1. Overview:

As is known to all, perimeter security alarm system is the first line of safety defense system and the most important defensive line. When criminals across the perimeter security alarm system, front-end detectors will be issued alarm signals and send it to the system control center, after the system control center processes the signal it will issued a processing instruction. Previously, the perimeter prevention's main Cutting-edge detector is infrared detector. But infrared detector has its fatal flaw- the environmental interference cause a big probability of the misstatement , make some places of the infrared alarm systeman become a empty shell In recent years some manufacturers have developed vibration cable, leakage cable, tension type fences, etc, but for not very mature technical performance ,their promotion is very slow.In this case high-pressure electronic fence appeared.

On August 20, 2007,Shanghai public security bureau technical prevention office sent a notice about the use of electronic fence perimeter warning system. On September 19,2008, National standards committee issued GB: pulse electronic fence and its installation and safety operation《GB/T 7946-2008》, which standardized the electronic fence ‘s each component installation requirements.

Shanghai public security bureau technical prevention office according to Shanghai local characteristics issued《The city with a high security engineering electronic pulsed detector's basic technology requirements》in June 2009, 8 and illustrated that when the GB abhorrents to the 《Basic requirements in implementation》,we press《Basic requirements in implementation》.

Thus it can be seen the design and construction of the high-pressure electronic fence standard is mainly according to the《The city with a high security engineering electronic pulsed detector's basic technology requirements》.

2. Sketch of the high-pressure electronic fence's working principle.

Electronic fence system includes two parts，pulse hosts and front-end fence. Pulse hosts produce high pressure (general < 5000V) electrical impulses, and transfer to the front-end fences, give the invaders intense shock and makes them retreat . Electronic fence is mainly to the invaders double deterrences (mental and physical), which combines double merits of alarm and alert.

3. The existent problems of high-pressure electronic fence.

High-pressure electronic fence are easily damaged by paralysis and makes the system paralyzed,but the system is still working normally.

At this time, if the criminals tear down jumper cables, all the electronic fence will be paralyzed. Even if all metal wire is short circuit or be cut off, the systems are also not alarm and have any voltage,.So the criminals can easily enter the protected areas.they will use the insulation wire to Bypass the alloy wire of electronic fence, then cut off this section alloy wire, the system will work properly. While the electronic fence will appear a trimming that make criminals access easily.

The high-pressure of the electronic fence's high-pressure host issueed is 5KV, Article 5.2.4 of《The city with a high security engineering electronic pulsed detector's basic technology requirements》regulat:The top root metal conductors of the front-end detection fence and the appendages’s spacing should be not less than 800mm. For the upright installation electronic fence , 800mm height is just a person's long legs. That means if the alloy wire be covered by a layer of insulating objects, Man can easily climb over the wall with electronic fence.The blocking effect will be better for the inclined installation electronic fence. But still can't avoid the possibility of trespassing.

Article 5.2.3 of《The city with a high security engineering electronic pulsed detector's basic technology requirements》regulat: Appendages (fence)'s height should between 2.0 m - 2.8 m, plus the inclined electronic fence's 0.8 meters, the highest reaches 3.5 meters. Put the person handwriting escalator whose height is 3.5 meters in electronic fence’s side (usually in lateral), Covering electronic fence with insulating content, then climbing over the electronic fence is not a difficult work, Especially in the casees that people together to commit crime.