UPS Frequently Asked Questions and Answers

　　1 Why use UPS? What is the role of UPS?

　　Answer: Due to the development of information technology, the network has become an indispensable part of people’s lives and work. The power supply reliability of the digital computer room that constitutes the network has become the key, and the reliable power supply of the computer room is the top priority. UPS is for Set up to solve uninterrupted power supply, UPS has three basic functions: voltage stabilization, filtering, and uninterrupted. When the mains power supply, it is the function of the voltage stabilizer and the filter to eliminate or weaken the interference of the mains power and ensure the normal operation of the equipment; The DC power provided by the diesel generators, diesel generators, etc.) is converted into perfect AC power for the load. Among them, the switch from mains power to battery power is generally 0 time switch, so that the load equipment can keep running without feeling any changes. Ensure the uninterrupted operation of the equipment.

　　2. Is the UPS generally capable of carrying inductive loads or capacitive loads? Why?

　　Answer: Generally, UPS is designed according to inductive load, so it is its duty to carry inductive load. Generally, the capacitor connected in parallel at the output of the UPS inverter plays a filtering role on the one hand, and on the other hand, it cancels the inductance component in the load. If the load is capacitive, how can a capacitor be used to offset the capacitive component? Only the capacitance component of the output can be increased, and the current of these capacitance components must be provided by the inverter, so that the active component of the inverter output is reduced, so the carrying capacity is weakened.

　　3. What is the function of STS (static switch), LBS (synchronizer) and dual bus?

　　Answer: The function of STS is to switch between two input AC power, and the function of LBS is to synchronize the two sets of UPS, the purpose is to make the switching time of STS zero. The function of the dual bus is to provide redundant power to the electrical equipment.

　　4. What is the main difference between EPS and online UPS? What is the main purpose of the two?

　　Answer: The same as UPS: EPS is a 100% backup UPS, and its working principle is the same as the backup UPS. Differences: Due to the different loads carried by the EPS, such as lighting and starting the water pump, the power needs to be large. The inverter can be made into a frequency converter when starting the water pump; while the backup UPS is mainly targeted by PCs. Such IT equipment, so the capacity is rarely more than 3KVA. Generally, online UPS is used for IT equipment above 3KVA, and EPS cannot be used in IT equipment.

　　5. What are the advantages and disadvantages of the power frequency machine and the high frequency machine? Can high-frequency machines replace industrial frequency machines?

　　Answer: Industrial frequency UPS: The disadvantage is that the input power factor is low, the power consumption is large, the efficiency is low, the volume is large, heavy, the price is high, and the reliability is low; the advantage is that it is relatively easy to manufacture, especially the manual operation has little effect. The consistency is relatively low. High-frequency UPS: The advantages are high input power factor, low power consumption, high efficiency, small size, light weight, and high reliability; but it has high requirements for production methods and strict requirements for consistency.

　　6. Why is the capacity of UPS expressed in VA? What is this power?

　　Answer: The unit of active power is Watt (W), and the unit of reactive power is Var (var). Generally, the capacity of UPS is expressed by apparent power. Since apparent power contains both active power and reactive power, it can neither be called W nor var. Since the apparent power is volts (V) and amperes ( A), simply called VA.

　　7. What is active power and reactive power?

　　Answer: Active power refers to the power that can make the load do work, such as making a light bulb glow, making a circuit work, and so on. After doing the work, it turns into heat completely and radiates into the atmosphere, and is gone forever. Reactive power refers to the power stored in the energy storage device (device), which can be converted into active power.

　　8. What is the definition of UPS efficiency? What does it represent? Is it the same thing as power factor?

　　Answer: The definition of η of UPS efficiency is: the percentage of the ratio of the output active power P to the input active power P’, namely: η=(P/P’)%. It is a sign that measures the size of UPS power consumption. And power factor is not the same thing.

　　9. What is the capacity unit of the battery? What does it mean?

　　Answer: The unit of battery capacity is ampere hour, abbreviated as ampere hour (AH), which means that the battery is discharged at a constant current or constant power under the condition of a specified discharge rate, and the amount of capacity released at the end of the specified discharge time. For example, if a battery with a discharge rate of 10 and a capacity of 100 AH is discharged with a constant current of 10 A for 10 hours, the discharged capacity is 100 AH.

　　10. What are the benefits for users to understand the development of UPS?

　　Answer: The main purpose of understanding the development direction of UPS is to enable users to avoid buying obsolete equipment that has been eliminated or will be eliminated immediately, so as to avoid unnecessary losses. At present, UPS has developed into an online parallel redundant modular solution system UPS. Both distributors and users can realize that the modularization has come, and it will replace the traditional UPS in the data room application.

　　11. What is the development trend of UPS?

　　Answer: The main purpose of developing UPS technology is to improve the dynamic response of UPS to the output load faster and better. Obviously, modular UPS adopts foreign advanced high-frequency technology, which can achieve the fastest dynamic response speed and the best effect.

　　12. Can the traditional power frequency machine with output isolation transformer increase the load capacity and reduce the zero-ground voltage?

　　Answer: The output isolation transformer of the industrial frequency machine is strictly an indispensable component of its inverter part. It has no full isolation effect, because the bypass has no isolation and the neutral line has no isolation.

　　13. Is there lightning protection on the UPS?

　　Answer: UPS can be equipped with input C-level lightning protection. It has two methods: 1) Lightning protection that takes the protection of the load as the priority; 2) Lightning protection that takes the protection of the power supply as the priority, but it has little effect. Because the UPS is equipped with lightning protection, at best, it can only make the power distribution cabinet a first-level lightning protection, but the lightning protection device cannot be omitted in the power distribution. Lightning protection is definitely a very secondary factor in UPS selection.

　　14. Can the UPS with an isolation transformer increase its anti-overload capability?

　　Answer: Wrong, it is slow response speed, UPS will skip bypass operation after overload, and resume rectification and inverter operation after the load is normal. We should upgrade UPS capacity to meet the ever-increasing load expansion needs.

　　15. Is the quality of the industrial frequency machine more stable?

　　Answer: The quality of some domestic high-frequency machines is not good due to cost reduction, production conditions and backward design. The current high-end UPS brands such as German Rittal, PK, American Powerware, Emerson, Swiss Nengwei, etc. all have highly integrated modular high-frequency UPS series. It is more environmentally friendly and energy-saving, and is the trend of the development of green computer room UPS.

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