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UPS backup time is generally a problem concerned by customer in the purchase process. Usually most people prefer to choose the UPS which power backup the longer the better, in fact, this is not correct.

We must firstly clear that the seller will usually have standard type UPS and long-acting UPS. Standard type UPS with built-in battery, after a power interruption can supply power to the load equipment in general for a few minutes to tens of minutes, of course, the length of time depends on the load. Long acting UPS can not only meet the power requirement of load, but also meet the requirements of customers and work types and so on, so the long-term UPS is usually equipped with an external battery pack.

If the client is not particularly strict to the work condition of the load, and the power of the load is not particularly large, usually with standard type UPS would be enough. Because the choice of long backup time UPS is bound to increase the number of battery groups and thus increase costs, is undoubtedly a waste which requirement is not very high.

Generally, in the power environment is poor, more frequent power outages in the area power supplied by UPS and generator, while the battery power supply is mainly affected by the load size, battery capacity, environmental temperature, battery discharge cut-off voltage and other factors. So this time we recommend that users generally choose to better safeguard the long-term high type operation UPS. Reasonable UPS hardware configuration can not only reduce the costs, but also provide better power security.

SOROTEC HP9115CRT 1-10KVA Rack Mount UPS

To understand the need for the use of UPS monitoring system, it is necessary to understand why the implementation of the UPS monitoring. The reason to monitor and manage of UPS, in fact, is determined by the limitations of the traditional UPS system itself.

1.The failure rate of single UPS is high, and often affect the support system of the normal operation of the system. Traditional single UPS without alternate lines or emergency plan, all of the power supply lines are single line, once the problem occurs, the power supply disruption is inevitable. Once this situation occurs and further spread, if there is no timely response to the corresponding measures, it is likely to cause irreversible loss.

2.Poor scalability. Traditional UPS configuration is fixed, and can not be upgraded, such as the case of information systems upgrade and led to the requirement to improve the power supply capacity, the only way to solve the problem is to buy a new UPS. Then, UPS power supply system itself can only protect the security of power supply, the power environment of the monitoring and management is powerless.

3.Maintenance cost is high. The maintenance of traditional UPS system is a high technical level work, need to be completed by professional and technical personnel, the user is generally not able to replace, which resulted in great cost of the maintenance.

4.Management is difficult. There is no difference of the battery in the function and use, when a piece of the battery failed, the UPS power supply can not be closed in time and replaced, can only report the system failure, then replaced by the management staff manually; the majority of small and medium room without staff on duty 24 hours. General inspection methods, can not be to find the hidden dangers in first time, with the existence of security risks during non working hours and holidays, the management staff can not be informed and do the appropriate treatment.

In addition, the UPS automation standardization management, is truly a key step to achieve the security and reliability of the UPS system, but also to achieve the unattended computer room.

The online UPS is kept the inverter in a working state, it starts by an external AC into DC, then through high quality inverter to convert DC to high quality sine wave AC output to the load. The main function of the online UPS in the power supply situation is the voltage stabilizing and preventing the electric wave interference; when the power is cut off, the standby DC power supply (battery pack) is used to supply power to the inverter. Because the inverter has been working, so there is no switching time problem, it is suitable for the power supply which has strict requirements.

Online interactive UPS : this is a kind of intelligent UPS, refers to when the input voltage of the inverter is normal, UPS is working in reverse, for charging the battery; when city power anomaly, the inverter immediately turn to inverter working state, the battery power is converted to AC output, so the online interactive UPS also has the conversion time.

Originally, online interaction is the United States IEEE electrical architecture classification method, refers to a kind of electrical architecture which inverter in electricity output beside the monitor, while added power, almost simultaneously from the battery provided by the electrical energy. Online type use the structure of which power is supplied by the inverter, even if the power is off, or by the battery to provide energy for the inverter. These two methods have battery power to inverter transfer time, from the view of efficiency, the former has advantages. From the view of waveform switch, the latter is relatively smooth. But the difference of this classification in the current electrical technology on the energy conversion time is not significant, no sense. Is an outdated classification method.

Online interactive UPS is generally a series of APC, and simply does not switch time, is suitable for the load which has high power requirements. The online interactive UPS in good condition under electricity directly supply city power to load, the inverter to charge the battery, but when a bad power or power is cut off, inverter will output sine wave immediately to the load, have a conversion time, is suitable for the load which requirement for power is not high.

Simply, there will be a few milliseconds interruption of line interactive UPS when power conversion, but has no effect on a computer and other equipment , at the same time, because the design of online interactive UPS is relatively simple, so generally less fault. Online interactive UPS has the conversion time, while online UPS no, online interactive UPS is the square wave output, while online UPS is the positive wave output. Price is also different.

The island effect: refers to the power outages due to failure or maintenance of the part of the grid, power lines power supplied by grid connected power generation device, and constitute a self powered islanding phenomenon with the surrounding load. GB/T19964-2012 standard require power station with anti islanding protection equipment, usually the inverter adopts active + passive double anti islanding protection, to protect the inverter in any case can be reliably disconnected from the grid connection. Active protection is usually used to inject small interfering signal to the power grid, by detecting the feedback signal to determine whether the loss of electricity, while the passive protection usually uses the detection output voltage, frequency and phase to determine the occurrence state of the island.

Series inverter: the AC side is directly connected in parallel, and the active protection can not be applied in the multi machine parallel system because of the active protection, unable to perform active protection in isolated island protection.

Application risks: the resonant island will cause a security threat to the line maintenance personnel, and damage the electrical equipment, seriously affect the safety of the operation of the power station, etc..

Centralized inverter: AC output without concentration, direct access to the dual split winding transformer, while the implementation of active and passive island protection.

The main differences between the industrial UPS and high frequency UPS are embodied in the rectifier and transformer. Industrial UPS rectifier uses SCR device, the voltage stress is small, the current stress is big, the high frequency UPS mainly uses the IGBT device, the current stress is small, the voltage stress is big. SCR and IGBT are currently completed devices, as long as the application properly, there will be no difference in the reliability. In fact, the inverter part of industrial UPS is also use of IGBT, and there is no reduction in the reliability of industrial UPS power supply, and there is no evidence to prove that the inverter is the weak link in the industrial UPS. From the topological aspect, industrial UPS with the phase controlled rectifier + full bridge inverter, high frequency UPS generally with rectifier + half bridge inverter. These topologies are very popular in the electronics technology, and there is no more reliable question, its reliability depends on the level of design.