The perimeter alarm system uses a technique such as microwave, active infrared, and electronic fence to form a protective wall that is visible or invisible at the boundary of protection. When a wall-to-wall behavior occurs, the corresponding zone detector will send out an alarm signal. And sent to the control center of the alarm control host, sound and light warning at the same time show the location of the alarm, but also linkage perimeter analog electronic screen, and even linkage camera surveillance systems, access control systems, strong lighting systems. In recent years, the perimeter defense system has become a basic and indispensable security subsystem for security systems. It can be seen not only in high-end areas such as military factories, barracks, airports, ports, and government agencies, but also widely used in residential communities. In these areas, there is a very high rate of application growth. Cable theft is a common technique. Several common cable anti-theft technologies 1, power carrier communication monitoring system anti-theft The power carrier is a concept derived from the cross-discipline of power and communications. The power carrier communication method (shown in Fig. 1) utilizes signal transmission means in the wire and cable anti-theft system to load the detection carrier signal on the detection range cable, and the monitoring center alarm is connected to the carrier signal on the monitored cable. The cross-section of the cable leads to the interruption of signal transmission. If the alarm can't receive the signal, it will be automatically alarmed and serve as a warning. The power carrier communication method is currently the most widely used anti-theft measure because it transmits carrier signals on the monitored cable and does not require extra lines. Therefore, the power carrier communication method is easy to install, conceals detection, and has a wide monitoring range. A few kilometers or more) and so on. However, since the cable can only be stolen when the cable is stolen, it cannot be deterred to criminals, and video video forensics cannot be used. A single power carrier communication is facing challenges of integration and systematization. 2, capacitance detection and monitoring system anti-theft The principle of the capacitance detection method is to use a pair of empty cables to short the cable terminals and the other end to connect to the multivibrator of the alarm. When the cable works normally, the oscillator of the alarm device will not generate vibration; when the cable outlet section is cross-sectioned, it is vacant. The cable becomes a simple capacitor and the oscillator outputs a signal that causes an alarm and the frequency of the oscillator output signal varies as the cable is switched off. Figure 2 shows the basic model of the capacitance detection method. 3, current detection monitoring system anti-theft The system judges the integrity of the cable system by detecting on-line whether there is a transmission current in the cable loop. In other words, when the cable works normally, the detection system will not respond; when there is no current transmission in the cable, the detection system will start the alarm system. The current detection system cannot be used for voltage anti-theft systems with no current, such as subway tunnels or road tunnel blower power cables. In addition, the system can only alarm when all branch cables of the circuit system are cut off (because the total current of the cable loop is zero when all the cable branches are disconnected). Therefore, there are hidden dangers in the current detection type monitoring system.
The booster Pump is called a booster pump installed on the pipeline. It is a special name for many pumps. Generally speaking, the pipeline booster pump refers to the pump that is installed on the pipeline to transport liquid, and is not limited to a certain type or form of pump. It can be vertical or horizontal, such as vertical multi-stage centrifugal pumps. , Horizontal multi-stage centrifugal pumps, vertical single-stage centrifugal pumps, horizontal single-stage centrifugal pumps, self-priming centrifugal pumps, etc. can all be called pipeline booster pumps. Generally speaking, the pipeline booster pump in the industry generally refers to a pump with a pipeline structure, which can be directly installed in series like a pipeline.
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Common cable anti-theft analysis