1. What kind of load capacity is generally strong in UPS?
Generally, UPS is designed according to inductive load, so it is its duty to carry inductive load. Generally, the capacitors connected in parallel at the output end of the UPS inverter play the role of filtering on the one hand, and offset the inductance component in the load on the other hand.
If the load is capacitive, how can the capacitance component be offset with capacitance? The output capacitance components can only 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 load capacity is weakened.
2. What is the function of STS, LBS and dual bus?
The function of STS (static switch) is to switch between two input alternating currents. The function of the LBS (synchronizer) is to synchronize the two sets of UPSs in order to make the switching time of the STS zero. The function of the dual bus is to provide redundant power supply to the electrical equipment.
3. What are the advantages and disadvantages of the comparison between the power frequency machine and the high-frequency machine?
Power frequency machine UPS: the disadvantages are low input power factor, high power consumption, low efficiency, large size, bulky, high price, low reliability; The advantage is that it is relatively easy to manufacture, especially when it is done manually, and the consistency is relatively low.
High-frequency UPS: the advantages are high input power factor, low power consumption, high efficiency, small size, lightweight, and high reliability; However, the requirements for production methods are high, and the consistency is strict.
4. Why is the UPS capacity represented by VA? What is it called power?
The unit of active power is watts (W) and the unit of reactive power is var. Generally, the capacity of UPS is expressed by apparent power, because the 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), it is simply called VA.
5. Is there lightning protection on UPS?
UPS can be equipped with optional input C-level lightning protection, which has two ways: lightning protection with priority to protect the load; Lightning protection prioritizes the protection of power supply, but it has little effect. Because the UPS is equipped with lightning protection, at best, it can only make the provincial lightning protection in the distribution cabinet, but the lightning protection device cannot be omitted in the power distribution.
6. What are the benefits of understanding the development of UPS for users?
The main purpose of understanding the direction of UPS development is to enable users to avoid buying equipment that has become obsolete and has been eliminated or will be phased out immediately, so as not to cause unnecessary losses. At present, UPS has developed to the online parallel redundant modular solution system UPS, please channel providers and users can realize that modularization has come, it will replace the application of traditional UPS in the data room.
7. Is the output isolation transformer of the power frequency machine fully isolated?
Strictly speaking, the output isolation transformer of the power frequency machine is an indispensable component of its inverter part, and there is no full isolation effect, because there is no isolation of the bypass and no isolation of the neutral line.
8. What is the development trend of UPS?
The main purpose of developing UPS technology is to improve the dynamic response of UPS to the load at the output end, which is faster and better. UPS will be more intelligent, networked, green, and high-frequency in the future.
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