What are the basic parameters of UPS uninterruptible power supply

UPS uninterruptible power supply is a constant voltage and constant frequency power supply with energy storage device and inverter as the main component. Mainly used for computers, computer network systems or other power electronic equipment to provide uninterrupted power supply. When the mains input is normal, the UPS will stabilize the mains and supply it to the load for use. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery in the machine; when the mains is interrupted (accidental power failure) Immediately, the UPS will continue to supply 220V AC power to the load through the inverter conversion method from the power of the battery in the machine, so that the load can maintain normal operation and protect the software and hardware of the load from damage. UPS equipment usually provides protection for both over-voltage and under-voltage. Main parameters of UPS power supply 1. Input parameters: input voltage range. According to the low quality of my country's power grid, a wider range of UPS power supply should be selected. The current UPS design with SCR ranges from -15% to +10%. The range designed with IGBT rectifier is -25%, +23%; the frequency range is best to choose a wider range of 50Hz±5Hz; the AC bypass voltage range is ±10%, if it exceeds this value, the failure rate of UPS will be increased; The UPS shall have the automatic protection function of three-phase input phase sequence error and three-phase open-phase input. 2. Output parameters: static stability of output voltage, medium and large UPS is ±1%; transient voltage fluctuation value of output voltage, medium and large UPS is less than ±5%; adjustable range of output voltage, medium and large UPS The minimum adjustable from the rated value is ±5%; output frequency, medium and large UPS is 50Hz±0.1%; output overload capacity, medium and large UPS meets 125% load for more than 10 minutes, and 150% for more than 1 minute Load; has the ability to carry three-phase 100% unbalanced load, the three-phase voltage difference should not exceed ±3%; the harmonic distortion of the output voltage 3. Rated operating parameters: rated output power; rated maximum output, input current; rated The output and input frequency is standard 50Hz in our country; the nominal input and output voltage are determined according to the way of incoming and outgoing lines. There are mainly single-in-single-out, three-in-single-out, and three-in-three-out methods. Three-in and three-out line in and out. 4. Other parameters: The mean time between failures is 200,000 to 400,000 hours (large UPS power supply), 150,000 to 220,000 hours (medium UPS power supply); parallel capability, requires UPS to have direct parallel output capability, and each UPS output current The unbalance of current sharing is 2% to 5%, and the value should be as small as possible; it should have the functions of remote monitoring, fault alarm, and operation status recording; it should have the functions of lightning protection, surge suppression, and anti-static discharge. The basic parameters of UPS uninterruptible power supply: 1. Loads can be divided into three types, below 10kVA is small load, 10-60kVA is medium load, and above 60kVA is heavy load; 2. Harmonic content (distortion) of output voltage and harmonic voltage The reference voltage and low-voltage logic circuits in the circuit will cause noise; 3. Step load When a part of the load is turned on or off, the load will have a step change. Since the UPS cannot instantly correct this sudden change in current, the output voltage will change accordingly. Because of the small load, only a few devices are connected, sometimes a 100% step load will appear. The step of medium load does not exceed 50%. The large load can only appear in a step load exceeding z5% under abnormal operating conditions. The general inverter design can meet the step load of less than 25%; 4. Non-linear load refers to inductive load or capacitive load. In computer systems, nonlinear loads are mainly hosts, printers (especially laser printers) and display terminals; linear loads are mainly disk and tape devices. Generally, small loads are non-linear loads; medium loads are linear and non-linear loads are similar or one of them is slightly larger; and large loads are generally linear loads, because large loads are composed of multiple devices, one after another during operation, and the overall load looks more macroscopic Stable; 5. Efficiency For a large system, the efficiency must be high enough. For example, if a 125kVA UPS has an efficiency of only 85%, the annual additional cost is equivalent to 30% of the initial investment; 6. Small and medium-sized UPS requires the volume to be as small as possible; 7. Noise level of UPS uninterruptible power supply It should not exceed the noise level required by the environment in which it is located. The research and development of UPS power supply is based on high-quality, high-reliability customer requirements, and aims to solve the typical power supply problems faced by modern small and medium-sized data rooms. At the same time, it takes into account the requirements of adapting to the increasingly sensitive investment return rate, energy consumption cost, remote intelligent management and efficiency. What are the UPS power parameters? I believe everyone has no doubts about this issue at this moment. In short, these parameters are what we need to pay special attention to when choosing the UPS power supply. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.