What is the working principle of the community electronic fence?

The name of the “grid” on the wall of the community is called “pulse electronic fence”, which has the characteristics of high voltage (high voltage: 5KV—10KV, low voltage: 700V—1000V) and low energy (maximum energy of single pulse output does not exceed 5.0J).

After the pulse generator (main unit) is energized, the transmitting port sends a pulse voltage to the front fence. The time interval is about 1.5 seconds, and the pulse stays on the fence for about 0.1 second. After the loop is formed on the front fence, the pulse is returned to the host for reception. Port, this port receives the feedback pulse signal; the host also detects the resistance between the two transmitters. If the front fence is broken and the circuit is broken or shorted, the receiving port of the pulse host can not receive the pulse signal or the resistance between the two transmitters is too small, the host will issue an alarm.

Fence alarm

Through the working principle of the electronic fence, no matter what voltage working state the pulse host is in, when the fence is damaged, the receiving port can not receive the pulse signal, the pulse host will alarm; similarly, when the two electronic cables are short-circuited When the resistance is very small, the pulse master will also alarm.

When a criminal attempts to cross or cut an electronic cable, the zone controller uses the pulsed high voltage of safe energy to repel the intruder and simultaneously issue an alarm signal. The false alarm rate of the electronic fence is quite low. Only when the short circuit is broken or disconnected, the alarm will occur when the host is removed.

About partitioning

The fence is divided into zones. At present, the number of single-wire meters that can be controlled by pulse controllers on the market is about 10,000 meters. If the fence is 4 lanes, which is commonly installed on the market, the length of the fence is about 2,500 meters. If there is an alarm, the security personnel will take a long time to find the location of the accident and cannot handle it in time. For example, the Shanghai Technical Defense Office requires that the perimeter alarm system should not exceed 100 meters per zone, so how to divide the zone is very important.