What is a data center server cabinet? What does a standard cabinet look like? How to install and wire the cabinet? What does the cabinet do?

What is a data center server cabinet? What does a standard cabinet look like? How to install and wire the cabinet? What does the cabinet do?

In a - 48V power supply system, 24 2V batteries are usually used in series to form a battery pack; In a - 24V or+24V power supply system, 12 2V batteries are usually used in series to form a battery pack. The specification, model, and capacity of each battery in the battery pack should be the same. When using two sets of batteries in parallel, the performance of the two sets of batteries should be consistent.
Compared with lead-acid batteries, alkaline batteries have advantages such as resistance to overcharge, over discharge, and long service life. However, they are rarely used in communication offices (stations) due to their low electromotive force and high price.
3) DC distribution panel
The DC power distribution panel connects the output terminal of the rectifier, the storage battery, and the load to form a fully floating charging DC uninterruptible power supply system, and performs distribution, on-off control, monitoring, alarming, and protection of the DC power supply.
According to different power distribution methods, DC power distribution panels are divided into low resistance power distribution and high resistance power distribution. Most communication equipment adopts low resistance power distribution, and the low resistance power distribution panel has fewer output branches. The cross-sectional area of each output branch feeder should be large enough to make the voltage drop on the output feeder less than the specified value. Some communication equipment, such as Sweden's AXE-10 SPC exchange, require high resistance power distribution. The high resistance power distribution panel has multiple output branches, feeding each rack of the switch separately. Each output branch leads to positive and negative feeder lines. Each negative feeder line is led out through a fuse, which is a small cross-section high resistance feeder line. The resistance of each negative feeder line should not be less than 45m Ω, and the cross-sectional area of the negative feeder line should be 10mm2. If the feeder line is short in length, a 30 m Ω resistor piece should be connected in series, and the resistance of the positive feeder line should be less than 1m Ω, and the internal resistance of the battery should be less than 4-5m Ω. The advantage of high resistance power distribution is that when a short circuit occurs in a certain rack, the resistance of the high resistance feeder is about 10 times the internal resistance of the battery, which limits the short circuit current and can greatly reduce the drop in the supply voltage of other racks.
In a large capacity high-frequency switching power supply system for communication, the DC power distribution panel is an independent cabinet. In the combined high-frequency switching power supply equipment, there is no separate DC power distribution panel, but there must be a DC power distribution unit.
(3) Grounding system
In order to ensure communication quality and personal and equipment safety, both the AC power supply system and the DC power supply system of communication power supply must have a good grounding device, so that the zero potential point of various electrical equipment has a good electrical connection with the ground.
According to functions, communication power grounding can be divided into working grounding (the positive or negative electrode grounding of DC power supply is called DC working grounding, and the neutral line grounding of AC power supply is called AC working grounding), protective grounding, and lightning protection grounding.
Since the 1980s in China, according to the lightning protection equipotential principle, communication bureaus (stations) have adopted joint grounding. The joint grounding method is a grounding method in which AC and DC working grounding, protective grounding, and building lightning protection grounding all share a common grounding system. The combined grounding system consists of four parts: a grounding grid (consisting of one or more sets of grounding bodies interconnected underground), a grounding lead, a grounding convergence line, and a grounding wire.
-For 48V or - 24V power supply systems, the positive end of the power supply must be reliably grounded+ For a 24V power supply system, the negative terminal of the power supply must be reliably grounded. This is known as DC working ground. The metal shell of the power supply equipment must be reliably grounded for protection. The grounding wire for DC working grounding and the grounding wire for protective grounding should be separately connected to the grounding bus (or busbar). It is strictly prohibited to install switches or fuses in the ground wire.
2.3.2 Composition of distributed power supply system
The block diagram of the distributed power supply system is shown in the following figure.
The decentralized power supply mode actually refers to the DC power supply system adopting the decentralized power supply mode, while the AC power supply system is still basically centralized power supply. In principle, the same communication bureau (station) should be equipped with a total AC power supply system, which respectively provides low-voltage AC power to each DC power supply system. In the AC power supply system, only the AC distribution panel and high-frequency switching rectifier are equipped in a decentralized manner. Each DC power supply system can be set by floor or by communication equipment system; The setting location can be a separate power battery room or the same machine room as the communication equipment.
When adopting the decentralized power supply method, the communication equipment in the communication building is divided into several parts, each part being powered by a power supply system with appropriate capacity. The probability of multiple power supply systems failing at the same time is small, that is, the probability of global communication paralysis is small, and the power supply reliability is high. In addition, the power supply equipment in the decentralized power supply mode should be arranged close to the communication equipment, and the length of the DC feeder line from the DC distribution panel to the communication equipment is shortened. Therefore, the power consumption of the feeder line is small, energy-saving, and can reduce line material costs. Therefore, decentralized power supply is now used in communication buildings.