The shielding room is also a kind of shielding equipment. The cold-rolled steel plate is the main shielding material. The shielding room is mainly used to prevent information leakage of electronic communication equipment and ensure information security. In the process of construction, the shielding room needs to be grounded, so what is the reason for the shielding room to be grounded? Introduce you:
If the shielding room is not grounded, it will cause the radiation interference in the surrounding environment to produce induced voltage on the shielding shell. Moreover, because it is not completely enclosed, it will allow the inductive coupling to communicate between the inside and outside of the shielded room, which will reduce the shielding effect of the shielded room. Therefore, it needs to be grounded, which can eliminate the induced voltage and improve its shielding effect. .
Because the shielding room is an inversion with a large outline size, if the shielding room is floating on the ground, various radiation interference in the surrounding environment will induce voltage on the shielding shell. Since the shielding shell is not a complete enclosure, it may cause outdoor electromagnetic interference to be inductively coupled to the room, and at the same time, it can also inductively couple the strong indoor electromagnetic field to the outdoor, thereby reducing the shielding effectiveness of the shielding room. Shielding grounding can eliminate the induced voltage on the shielding wall and significantly improve the shielding effectiveness of low frequency bands.
But for the high frequency band, because the distributed capacitance between the shielding room and the ground can almost short-circuit the shielding room and the ground, the grounding of the shielding room installed on the ground has little effect on the shielding effectiveness. Even when the length of the ground wire is an odd multiple of 1/4 of the working wavelength, the ground wire exhibits a high impedance, which may reduce the shielding effectiveness.
There are two purposes for the grounding of the shielded room. One is to protect the safety of people and equipment from lightning, leakage, static electricity and other hazards. This type of ground wire is called a protective ground wire and should be connected to the real earth. The second is to ensure the normal operation of the equipment is called working ground. In the application of the shielded room, try to choose the mixed grounding method, so as to protect the safety of people and equipment under various conditions, and the equipment can work under normal conditions.