ups的选择与使用（The choice and use of UPS）.docVIP

ups的选择与使用（The choice and use of UPS） The choice and use of UPS Liukewen 1995-02-03 Here are some suggestions for the selection and use of UPS. First, the choice of UPS UPS supply power supply, uninterruptible power supply is not only a simple sense, the wide input voltage range, from 170V to 250V can be AC input, and its output power quality is very high also. (1) output voltage stability: Backup sine wave output 5%, on-line 3%; (2) output voltage waveform distortion: Backup sine wave output 5%, on-line 3%; (3) output frequency stability: backup type sine wave output is + 1Hz, line type is + 0.5Hz; (4) transient characteristics: when the load changes from 0%-100%, the output voltage range is 4%, the response time is about 10-40ms (online UPS); (5) generally can guarantee 150% load overload 1 minutes, 120% load overload 8-10 minutes; (6) if the output is three-phase, the ratio of the negative sequence component to the positive sequence component of the output voltage is generally no more than%. The above is the general requirement for UPS. As for the specific choice of what kind of UPS, we should also determine the following points: 1.UPS capacity determination: this depends on the magnitude of the load power. There are two ways to determine the load power: Measurement method: measure the load current under the condition of electrifying. If the load is single-phase, the load of the current is 2 times of the phase current and the phase voltage; if the load is three-phase, the load power is 3 times of the line current and the phase current product; Estimate method: add the power of each individual load, get and multiply by an insurance system K (K take 1.3) as the total load power. Using the above load power as the base, and taking into account the future expansion of equipment and leave a certain margin, you can determine the required capacity of the UPS. The 2. phase: determine the provisions of Chinas electric power system single-phase voltage 220V, three-phase AC v