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Analysis of Fire Accident Caused by Antistatic Floor in a Middle School
Overview The basic physical characteristics of static electricity are: attraction or repulsion, a potential difference from the ground, and a discharge current. There will be three kinds of effects on electronic components: one is that static electricity will absorb dust and reduce the insulation resistance of the components, thereby shortening the life of the electronic components; the other is that the static electricity generates a discharge phenomenon, which damages the component breakdown, and the heat generated by the electrostatic discharge electric field or current , Aging components; Third, the electromagnetic field generated by electrostatic discharge is very large, the frequency spectrum is extremely wide, and electromagnetic interference to electronic components. Because computer chips generally use ultra-large-scale integrated circuits, they are more sensitive to static electricity and will be damaged when the voltage reaches hundreds of volts or even tens of volts. Therefore, the more important equipment rooms have stricter requirements for protection against static electricity. Static floor . The main uses of Zhengzhou Tianchi anti- static floor are: first, to minimize the static electricity generated by the friction between the sole and the floor; second, to discharge the static electricity generated by the machine room to the ground through the anti-static floor . The anti- static floor support is not grounded, poorly grounded, the quality of the floor, or the installation and construction are not standardized, which will greatly reduce the function of the anti-static floor, and may cause static electricity accidents. Therefore, we must attach great importance to the construction of computer rooms to avoid unnecessary static electricity accidents. Zhengzhou Tianchi anti-static floor important note: anti-static floor must be qualified to ground; anti-static floor must be qualified. As the fire of antistatic floor is extremely rare, the author (Pang Huaji) dedicated the cause of the accident to everyone for reference and reference in the construction of the computer room. According to the description of the middle school teacher, at 3 pm on June 16th, there was a light rain. After a thunder, the school building lost power. Immediately after the fire broke out at the two antistatic floor joints in the network center computer room, there were five fires. Six centimeters high. Fortunately, it was discovered by management personnel and extinguished quickly, which did not lead to a major accident. On the scene, the two floors on fire were close to the door. One of them was not paved firmly and could move if you stepped on it. Under these two floors, there are fiber-optic box and Unicom network cables passing through, and there is no power cord nearby. The power cables of this equipment room are all passed through PVC pipes. According to on-site testing by technicians of the Municipal Lightning Protection Center, the grounding resistance of the antistatic floor support of the equipment room is 14 and the grounding of the equipment room is separately established. The grounding resistance of the grounding busbar in the equipment room is 200, but the grounding resistance of the grounding wire on the ground is 4 & 1. Close the power switch. There is a voltage of 10-20V between the grounding busbar and the floor support in the equipment room. Pull down the power switch and the voltage drop is 2-3V. Test with a multimeter. There is a drift voltage of about 10V between the neutral and ground lines in the room . There is a large billboard on the top of the building. According to the school's electrician, the ground wire of the billboard often carries a voltage of 110 volts. Probable cause There is no power cord under the floor, and there are no traces of burning in the nearby optical fibers and network cables. This can rule out the possibility of the line burning to ignite the floor. Only the static electricity can cause the floor to burn. When the electrostatic energy stored in the conductive volume is greater than the minimum ignition value of the combustible substance, ignition will occur. Due to the inadequate installation of the two floors near the door, people will move as soon as they step on it. Due to the proximity to the door, these two floors are often stepped on by people, which causes more friction with the edges of the surrounding floor, which causes burrs on the edges of the floor, and because the rubber beads are flammable, small electrostatic discharge may ignite The rubber burrs, and thus the rubber bead, burned on fire. Possible Causes of Discharge Between Floors 1 After testing and site investigation, it was found that the neutral and ground wires of the equipment room are mixed. Because the antistatic floor support is not equipotentially connected, part of the floor support and another part of the floor support have a potential of 20V for a long time. Poor, due to the skin effect of the electric charge, the electrostatic charges at the corners of the floor of the machine room have accumulated a lot. When the electric charge accumulates to a certain extent, a discharge phenomenon occurs between the gaps between two adjacent floors. Possible Causes of Discharge Between Floors 2 People wear leather shoes to walk on antistatic floor, and the static electricity generated may reach several thousand volts. Since the antistatic floor is not grounded or equipotential, these static electricity are not discharged anywhere. High potential difference, discharge will occur when the difference reaches a certain level. Possible causes of discharge between floors 3 The machine room has two grounding systems, each of which is independent. When a lightning occurs nearby (a trip and power failure after a lightning strike is evidence), the machine room does not have special shielding measures. Can induce electrostatic charges. During a lightning strike, there is also a high potential difference between the grounding systems, resulting in a low potential counterattack. The ground wire is in contact with the floor support in some places, which will also increase the potential between the floors. These two causes are superimposed, causing a large potential difference between the floors and a discharge phenomenon. The author believes that this reason is the most reasonable and is the culprit leading to the accident. The solution is to overhaul the circuit and arrange the wiring reasonably. It is better to lay strong and weak electric sub-slots and wear metal pipes to shield them. Integrate the two grounding systems into a common ground. Make equipotential bonding under the floor, cabinets, floor supports, and computer enclosures are all connected to the equipotential bus. Install corresponding SPDs on the power supply and signal sections to protect against the intrusion of lightning waves.
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