1.The role of 1UPS
The main functions of UPS are as follows:
(1) When the mains power is interrupted, it can use its own battery to convert the DC power to 220V AC power through the inverter circuit to supply power to the computer and network system to ensure the normal operation of the computer and network system.
(2) It has a stabilizing effect on the mains power, and can stabilize the voltage when the grid voltage fluctuates.
(3) It can suppress the power grid’s power harmonic interference, voltage drop, high voltage surge, voltage waveform distortion, electromagnetic interference and other power pollution, provide stable voltage and pure waveform power supply for computers and other equipment, and ensure computer and network systems The normal work and data are not disturbed.
1.2 Features of UPS
For a high-quality UPS power supply system, it should have the following characteristics:
(l) High reliability
The system should have the power supply capability to provide 365×24 continuous high-quality UPS inverter power supply.This means that in the operation of the UPS power supply system, neither instantaneous power supply interruption/power outage accidents, nor the direct supply of power from ordinary mains to the user’s load through the AC bypass, is not allowed..For this reason, the UPS power supply system is required to meet the following requirements:
——Due to the low failure rate of a single UPS, the current mean time between failures (MTBF) of large UPS products is 200,000 to 400,000 hours.
——Using the “N+1” UPS redundant parallel system with high fault tolerance function to further improve the reliability of the UPS power supply system (the typical MTBF value of the “1+1” redundant parallel system can reach 1.4 million ~ 2 million hours).
——In the entire UPS power supply system, there should be no single-point bottleneck failure hidden danger.
——Permit to perform maintenance and overhaul operations without power failure under the condition of continuous power supply of UPS inverter power supply.
——In the event of a short-circuit fault on the user equipment side, the impact of the fault should be reduced to the smallest possible range.
(2) High anti-interference
UPS power supply system can enable Internet equipment to obtain high “availability” and create an excellent operating environment for it.
A large number of operating practices have shown that the problem of power interference is one of the important reasons for the decline in the “availability” of Internet equipment.What needs to be explained here is: power interference not only comes from the ordinary mains grid, it also comes from the imperfectly designed UPS itself and the user’s Internet equipment itself..This is because the servers, disk array machines, and switches in the IDC and MDC computer rooms all have built-in switching power supplies. This rectifier and filter-type nonlinear load will reflect 3 to 23 low-order harmonic interference to the UPS power supply system. Brings the consequences of lowering the voice quality.Practice has proved that excessively large and excessively frequent power interference, the lesser one will cause hidden failures such as a decrease in the transmission rate of the Internet, an increase in the data packet loss rate of the network server and other hidden failures, which will cause the Internet equipment to be forced to enter the “derated usage” state. In severe cases, the network will be paralyzed.