Lightning Protection Solution for Telecom Room

Overview: With the continuous development of modern electronic technology, precision electronic devices are widely used in the operating systems of computers and communication networks in various industries. These high-precision microelectronic computer devices incorporate a large number of CMOS semiconductor integrated modules, and their ability to conduct pressure and overcurrent protection is extremely fragile. (U.S. General Research, Inc. provides magnetic field pulses in excess of 0.07 Gauss, which can cause computational failures; magnetic field pulses exceeding 2.4 Gauss can cause permanent damage to the integrated circuit.) There is no guarantee that a lightning strike in a particular space will still work safely. Most telecommunication network systems are high-precision electronic equipment. Their ability to withstand lightning currents is poor, and the probability of thunderstorm accidents is high. Moreover, telecommunications network systems require 24-hour day before tomorrow. Workstations and servers are connected through twisted-pair cables. Once they are struck by lightning, they will be severe. Affect the normal work of the network, while there is a loss of hardware damage and data loss. Therefore, it is very necessary to adopt lightning protection measures for the center room of the telecommunications system.
 

Lightning protection measures in the telecommunication system center room

The main point of our lightning protection for telecommunication system center room is diversion and equalization. Shunt is to let the lightning current flow into the ground outside the room through various channels, so as not to enter or enter the equipment room as much as possible; the pressure equalization is to keep the equipment as much as possible. The equipotentials, maintain the potential of the power ground, protection ground, lightning protection ground. According to the relevant standards of IEC, VDE, GB. We mainly provide lightning protection protection to the telecommunication system center room from the following aspects.

First, the power system protection

Weak electrical equipment because of its low operating voltage (a few volts or dozens of volts), the current is small (milliampere level), high frequency. Its ability to protect the power line over-voltage, much lower than the power equipment and power lines. Generally based on truncation Induction source, the key protection strategy, so that instantaneous over-voltage, current is suppressed to the computer, communications, instrumentation equipment can withstand large safety status.

Grade protection principle of lightning arrester: IEC (International Electrotechnical Commission) defines the protection zone for lightning protection. According to the requirements of the protection zone, it is necessary to install a corresponding lightning arrester at the junction of each zone, that is, the first level is Class B defense. Lightning device, the second grade is the C grade lightning protector, the third grade is the D grade lightning protector. Its working principle is to use the graded lightning protection device to discharge the energy induced by lightning and gradually reduce the surge voltage so as to protect the user terminal equipment.

A, first level (B level) lightning protection

Three power SPDs are installed on the output end of the transformer low-voltage power supply (ie, the room mains input power distribution box), with a maximum flow capacity of 50 kA (10/350 μs) and a protection level of less than 4 kV. If the switching SPD and the voltage limiting SPD are cascaded and the spacing is too small, the series decoupling device should be considered.

B. Second (C) Lightning Protection

The power supply SPD is installed at the input end of the three-phase AC power supply in the engine room. The nominal discharge current is 40 kA, the maximum discharge current is 80 kA, and the voltage protection level is less than 2.5 kV.

C, third (D) lightning protection

In the engine room important equipment (such as: program-controlled switches, servers, transceivers, etc.) installed on the power input side 0 single-phase power SPD, the nominal discharge current is 20KA, the maximum discharge current is 40KA, the voltage protection level is less than 1.8KV.