Power distribution unit

Abstract

A power distribution unit is used for power distribution of a data center and a communication machine room, wherein an input is from a three-phase five-wire system power supply and is provided with an A phase line, a B phase line, a C phase line, a neutral line and a ground line, an output is from a single-phase three-wire system power supply and is provided with a live line, a zero line and a ground line, output sockets of three phases are sequentially arranged, the load balance of the three phases in a cabinet is achieved, the line loss and the temperature rise are reduced, the loading capacity and the reliability of an uninterruptible power supply (UPS) system are guaranteed, and the hidden danger of power ripple to weak current signal interference is reduced; power sockets of the three phases are different in structure and cannot be plugged in a mixed way, a shell is provided with phase sequence marks of shapes, characters and colors, and the phase sequence is conveniently identified during installation or maintenance of a wiring line; the power distribution unit can monitor phase current and voltage, temperature rise, ground line current and three-phase load unbalance and is provided with a corresponding warning and output interface circuit, and alarm and centralized monitoring are facilitated in situations of overcurrent, overvoltage, overheating, device electric leakage and three-phase load unbalance; and with the arrangement of an input junction box, adaption delay is prevented, materials are saved, and the reliability is improved. The figure 1 is an abstract drawing.

Description

technical field [0001] The invention relates to the technical fields of data center, communication machine room power distribution and three-phase power load balancing, in particular to the technical fields of design and manufacture of a power distribution unit (PDU) in a machine room. Background technique [0002] Data centers and communication rooms, especially large computer rooms, are usually powered by an uninterruptible power supply (UPS). The input and output of a large UPS are all three-phase electricity; whether it is a power supply transformer or an uninterruptible power supply (UPS) power supply system, three phases are required. The load should be as balanced as possible; the power distribution unit (PDU) used in the computer room is usually connected to one phase of the three-phase electricity, and different cabinets are connected to different phases. This kind of power distribution unit (PDU) has the following technical defects: [0003] 1. Because the density ...

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Problems solved by technology

[0003] 1. Because the density and power consumption of servers, network equipment or communication equipment in different cabinets are inconsistent, different cabinets are connected to different phases, and the three-phase load balance is difficult to achieve, and repeated adjustments are required; the computer room often adds or subtracts cabinets or equipment, three As a result, the phase load balance is broken and needs to be readjusted. Most of the equipment is hot-line equipment, and power failure is not allowed, so it is difficult to adjust

[0004] 2. A cabinet is only connected to one phase, and the current of the neutral line is equal to the current of the phase line, and the direction is opposite. Compared with the case where the neutral line has almost no current when all three phases are connected to the cabinet, the line consumption and temperature rise are increased.

[0005] 3. If the three-phase load is unbalanced, the total load capacity of the uninterruptible power supply (UPS) system will decrease, and the reliability will decrease

[0006] 4. Due to the existence of the neutral current, the zero-ground potential difference is increased, which increases the hidden danger of the power supply ripple interfering with the weak current signal

[0007] 5. The length of the input line is fixed. During installation, it is necessary to connect the extension line with an adapter to reach the power distribution cabinet. The addition of an adapter also increases contacts and hidden troubles. If the length of the input line is customized, the design of the machine room will be more difficult, and the It is necessary to cut off redundant parts, resulting in waste

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