Explore anti-interference technology in data centers

Explore anti-interference technology in data centers

As we all know, as long as it is an electronic device, it will produce radiation and electromagnetic waves. A small amount of radiation is harmless to the human body, but excessive damage to the human body is serious. At the same time, electromagnetic interference also has an impact on the operation of the equipment, or even damage. In the data center, a large number of electronic devices will produce a large amount of electromagnetic interference. In addition to electronic equipment, there are also power equipment, transmission wires and structures, heat dissipation fans, fluorescent lamps, and so on, these will also generate electromagnetic. The data center has a small space, many devices, high power density, complex power distribution, many electromagnetic interference sources, and many sensitive devices, which leads to a prominent problem of electromagnetic interference in the data center. However, electromagnetic interference is invisible and invisible, and must be detected using professional equipment. Therefore, it is often ignored, in particular, the problems caused by some interference are not sudden outbreaks, but are slowly and imperceptible. As time passes, equipment damage will eventually occur. For example, in a data center with severe electromagnetic interference, the failure rate of the device is very high, and the device is damaged every other day. When the device casing is split, some components are damaged, some damages need to be detected before they can be identified. Therefore, electromagnetic interference has become an invisible killer in the data center. If it cannot be eliminated in time, there will be endless troubles.

Electromagnetic interference consists of interference sources, transmission media, and sensitive devices. Interference sources refer to the components, devices, devices, or natural phenomena that produce electromagnetic interference. transmission media refer to the coupling channels and coupling channels of electromagnetic interference, the main transmission modes of electromagnetic interference include radiation, transmission, and induction (capacitive sensing and inductive sensing). Sensitive devices refer to the devices that respond to electromagnetic interference. Let's take a look at the sources of interference in the data center. The electromagnetic interference produced by transformer is one of the main sources of interference in the data center because the power density of the data center is very high, the power load is relatively large, the number of transformer stations is relatively large, and the power is large; A large number of switching power supplies such as upss are used in the data center. High-frequency breaking of switching power supplies also produces high harmonic waves to form electromagnetic interference, large Current Breaking may also generate large impact current, and the change rate of current is very large, which also forms strong electromagnetic interference; non-human interference sources, such as natural noise, solar noise, and cosmic noise. In the middle, lightning electromagnetic interference is the most harmful. It is one of the main sources of electromagnetic interference in the data center. There are two types of lightning hazards, one is that lightning is close to the data center and directly harms the data equipment in the data center through induction. The other is that lightning senses a large amount of current on the transmission wires of the power system, transmitting data to the data center through transmission lines of the power system can cause damage to the data center equipment. The Integrated Wiring System also produces electromagnetic interference. Integrated Wiring itself is passive, but it becomes an important part of active devices after it is connected to various high-frequency network devices into a system. High-frequency signals transmitted by the Integrated Wiring System Form electromagnetic radiation, which forms electromagnetic interference and affects the surrounding electromagnetic environment; A large number of power devices, lighting devices, and electronic devices in the data center are sources of interference. It can be said that in the data center, interference sources can be seen everywhere, causing serious electromagnetic interference in the data center. In addition, the interference sources themselves sometimes need to act as transmission media or sensitive devices, because some sources of interference are electronic devices, there are also many internal sensitive devices.

Electromagnetic interference in data centers seriously threatens the normal operation of devices. In the case of severe electromagnetic interference, the hard disk and storage device of the server may be damaged, resulting in data loss. It may also lead to logic errors in signal processing, switching, and control, reduced communication data integrity, increased transmission error codes, and distorted signals; the peak interference caused by lightning strikes can trigger the pseudo-trigger of the logic circuit, and seriously damage the hardware and equipment. (when we watch TV at home, in case of thunderstorms, this is also the reason that the TV will be turned off), as well as the data center's workstation display, monitoring center display screen and other display is unstable, the screen image is jitters, or even black screen; the harsh electromagnetic environment and strong electromagnetic interference will also affect the health of data center staff. electromagnetic interference is a serious radiation that can work in this environment for a long time, damage to human experience. Under certain conditions, electromagnetic interference can lead to central nervous system dysfunction and plant nerve dysfunction, eye injury, induced cancer or immune deficiency diseases. People who have been working in the data center for a long time should pay special attention to stay away from high-power devices to avoid electromagnetic interference and physical injury.

Since electromagnetic interference has so many dangers, it is necessary to try to eliminate them all. However, some measures can be used to reduce the impact of electromagnetic interference on other devices and people. As mentioned above, electromagnetic interference consists of interference sources, transmission media, and sensitive devices. As long as any part is removed, electromagnetic interference will not occur, or the impact will be relatively small. First, we can reduce the interference source, which is the most direct elimination. However, many interference sources are also running devices and cannot be removed. We have to find a solution from other aspects, such as system grounding, filtering, and wiring rationality. These methods can reduce the electromagnetic intensity of the interference source, to some extent, the damage caused by electromagnetic interference to other devices is reduced. Secondly, the transmission media is interrupted to prevent interference sources from accessing sensitive devices. The main reason is to block the contact between interference sources and sensitive devices through shielding, isolate the two, and finally protect sensitive components. This also includes protection for people. Each device has many components that are sensitive to electromagnetic interference, these devices should be grounded, and metal casings should be added for shielding, while enhancing the anti-interference capability of sensitive components. People in the data center should wear radiation-proof clothing and anti-static gloves to avoid electromagnetic interference and damage to people.

Electromagnetic interference is everywhere in the data center. The quality of electromagnetic interference processing will directly affect the operation of internal equipment. During data center design, efforts should be made to design electromagnetic compatibility and optimize the electromagnetic environment of the data center, reduces electromagnetic interference and improves stability of data center operations.