Due to the application of digital communication networks and the technical compatibility between computers and broadcast television equipment, the use of power protection systems has become an important factor in providing absolute security protection for critical equipment. Based on years of market experience, the following issues should be noted when purchasing UPS power supplies:

one. How to determine UPS power?

Many users often have the same or slightly larger power than the load when determining UPS power. Due to the trouble of funds and the lack of understanding of UPS, the power of the UPS is often selected from the capacity of the current equipment room. In fact, this choice is not wise. We recommend that the user determine the selected UPS power from the following aspects.

1. UPS as the basic power supply equipment, the most important is reliability. In general, the MTBF (mean time between failures) of a higher power UPS is much higher than the MTBF of a small power UPS. Therefore, a UPS with a higher power should be selected for reliability considerations.

2. From the perspective of capacity expansion, we recommend an investment, once in place. The normal use of high-power UPS is generally 5 years or even 10 years. With the increase of integrated services, the increase of load power is inevitable. Once the power is in place, it can reduce repetitive investment in the long run.

3. If there are no special industry standards, we recommend the following options:

(1) UPS power is twice the load.
(2) The backup full load power supply time is not less than 30 minutes.

two. How to choose long delay UPS?

Long delay UPS consists of many parts, such as UPS host, charger, battery, switch, battery cabinet (rack). Improper selection of each part may increase the probability of failure of long delay systems. The following aspects should be considered.

1. Online UPS should be preferred, and the online UPS can operate for a long time. The capacity and heat dissipation of the power device are fully guaranteed during product design. The backup UPS inverter has poor long-term working ability. The reason is that only the backup working state of the UPS is considered in the product design. Whether the power device or the radiator is relatively low standard, it should not be used as a long delay UPS. Host selection. Avida's HQ, HP, HPC and other products are online UPS.

2. High-power UPS (above 60K) We recommend that the use of battery backup for a long time will do more harm than good. Some users choose UPS only to pursue backup power supply time, requiring 4 hours, 8 hours or even 10 hours, but neglect the reliability and economy of the entire power system. This is because:

(1) If the backup time of the high-power UPS is too long, it is necessary to use hundreds of batteries to supply the series and parallel use of multiple sets of batteries. Each battery is a faulty unit for the entire system. Once a battery is damaged, a group of batteries is quickly damaged. The longer the time, the more faulty units are, and the system reliability is reduced. With our statistics, 80% of UPS system failures come from batteries.

(2) The longer the backup time, the greater the proportion of funds used to purchase the battery. Taking 60KVA UPS as an example, the funds used for the 8-hour battery are 50% of the whole set of equipment, and the battery is a consumable item, which must be replaced in 3 to 5 years, resulting in waste of funds.

Third, with DC 48V and battery pack, do you still need UPS?

1. A real UPS should implement five major functions: voltage regulation, frequency stabilization, purification, anti-interference, and uninterrupted. In the mains, there are a lot of spikes, surges, and harmonic interference. The unstable factors in these mains are the fatal factors of computers and network systems. According to the statistics of authoritative departments: causing faults and data loss in important equipment such as computer networks, 80% are caused by power supply problems. DC power supply and switching power supply can not solve the above problems.

2. The most important function of the UPS is uninterrupted, and the power supply mode of the battery pack + inverter is relatively unreliable. Once the battery fails, the system must be interrupted. This kind of interruption is extremely dangerous and will cause huge losses. The uninterrupted function of the UPS is that the battery + inverter cannot be replaced.

3. To this end, we recommend using the "big horse cart" and the generator to solve the secondary problem: Take 20KVA UPS as an example: 20KVA 8 hours UPS can choose 60KVA for 2 hours.

(1) The number of batteries and the charger are reduced, and the system reliability is improved.
(2) Solved the problem of future equipment capacity increase.
(3) The big horse car system is more reliable.
(4) The funds are used to purchase fixed assets equipment instead of consumable batteries, and also avoid repeated investment in future load expansion.

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