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What are the technical parameters and specifications of UPS uninterruptible power supply? The technical parameters of UPS power supply are important indicators of UPS quality and the main basis for selection. Whether the UPS uninterruptible power supply can provide pure and uninterrupted power supply to the load equipment normally and safely requires a detailed understanding of its performance parameters.
The composition of UPS uninterruptible power supply
1.UPS host
2. Required functional parts (such as BCBBOX, etc.)
3.Battery
4. Supporting battery cabinet/rack, battery switch, etc.
5. Functional options (such as lightning protection, monitoring, harmonic control, upstream wiring, etc.)
Main technical parameters of UPS uninterruptible power supply
1. Input parameters
Input voltage range, according to the low quality of my country's power grid, a UPS with a wider range should be selected. The current range of UPS designed with thyristor is -15%, +10%. If this value is exceeded, the failure rate of the UPS will increase. ; The UPS should have automatic protection functions for three-phase input phase sequence errors and three-phase phase loss input.
2. Output parameters
The static stability of the output voltage is ±1% for medium and large UPS; the transient voltage fluctuation value of the output voltage is less than ±5% for medium and large UPS; the adjustable range of the output voltage.
3. Rated operating parameters
Rated output power; rated maximum output and input current; rated output and input frequency are all standard 50Hz in my country; nominal input and output voltage are determined according to the way of incoming and outgoing wires.
4. Other parameters
The average time between failures is 200,000 to 400,000 hours (large UPS power supply) and 150,000 to 220,000 hours (medium-sized UPS power supply); the parallel capability requires the UPS uninterruptible power supply to have direct parallel output capability, and the output current of each UPS is equal to The flow unbalance is 2% to 5%, and this value should be as small as possible; it should have remote monitoring, fault alarm, and operating status recording functions; it should have lightning protection, surge suppression, and anti-static discharge functions.
Technical parameters and characteristics of UPS power supply
●Input characteristics
Input voltage range A wide input voltage range can reduce the chance of battery discharge and extend battery life.
Input power factor The power factor is low, the input reactive power is large, and harmonic current pollutes the power grid and affects other equipment.
Main power frequency allowable range
Input current harmonic components
●Output characteristics
Static stability. 1% for large and 2% for small and medium-sized.
Output transient characteristics. 5% for large and 8% for small and medium.
Output overload capability. (For example: overload 125% 5MIN; 150S)
Output power factor. (0.8, 0.9, 1)
Output voltage harmonic distortion. Typical within 3%
UPS uninterruptible power supply specifications
UPS uninterruptible power supplies are generally divided according to power size, such as 500VA, 1000VA, 2kVA, and the number and voltage of input and output phases, such as 3-phase 380V input/single-phase 220V output, and power frequency (with output transformer) or high The frequency depends on how much battery can be configured (the length of backup time).
The specific model depends on the brand. Different brands have different models. The low power range is 1K, 2K, 3K, 6K, 10K, and the higher ones are 15K and 20K, and most of them are single-phase below 10K. Above 10K, there are single-phase and three-phase ones, and above 30K, they are all three-phase.
Basic parameters of UPS uninterruptible power supply
1. Since the UPS uninterruptible power supply cannot instantly correct this sudden change in current output voltage, there will be corresponding changes. For small loads, because only a few devices are connected, a 100% step load may sometimes occur. Steps occurring at medium loads do not exceed 50%. For large loads, step loads exceeding 25% may occur only under abnormal operating conditions. General inverter designs can meet step loads of less than 25%.
2. Efficiency For a large system, the efficiency must be high enough. For example, if a 125kVA UPS has an efficiency of only 85%, the extra annual cost will be equivalent to 30% of the initial investment.
3. Small and medium-sized UPS power supplies are required to be as small as possible.
4. Noise The noise level of the UPS power supply should not exceed the noise level required by the environment in which it is located.
5. Loads can be divided into three categories: small loads below 10kVA, medium loads between 10 and 60kVA, and large loads above 60kVA.
6. The harmonic content (distortion) of the output voltage. The harmonic voltage will cause noise to the reference voltage in the circuit and the logic circuit working at low voltage.
7. Nonlinear load refers to inductive load or capacitive load. Generally, small loads are nonlinear loads; medium loads are linear and nonlinear loads that 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 total load looks relatively large. Stablize.
Only by understanding the technical parameters and specifications of UPS uninterruptible power supply can you equip a suitable UPS power supply according to your needs.
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