中文版
Description
YPM106E-YT204001-FN Focus on the operating status of the UPS power supply at or near full load. Most engineers understand the operating characteristics of the UPS power supply under full load, especially the characteristics of the input filter, but few are interested in the condition of the filter under no-load or near no-load. After all, the UPS power supply and its electrical system have little effect on current harmonics under light load. However, the operating parameters of the UPS power supply when it is unloaded, especially the input power factor, are very important for the compatibility of the UPS power supply and the generator. The newly planned input filter plays a good role in reducing the current harmonic and improving the power factor at full load. However, under no-load or very small load conditions, a very low capacitive power factor is derived, especially those in order to meet the 5% high current distortion of the filter. In general, when the load is less than 25%, the input filter of most UPS power supply systems will cause a significant power factor reduction. Despite this, the input power factor is rarely less than 30%, and some new systems have even achieved no-load power factor of less than 2%, close to the desired capactivity load.
YPM106E
YPM106E-YT204001-FN This condition does not affect the UPS power output and critical load, and the mains transformer and transmission and distribution system are not affected. But the generator is different, experienced generator engineers know: the generator with a large capacitive load when the operation will be abnormal, when the access to a lower power factor load, typically less than 5% to 20% capacitive, due to system imbalance, may lead to generator downtime. The emergency generator system driving the load of the UPS power system will form a catastrophic accident after the mains power failure. Downtime poses a risk to critical loads for two reasons :(1) the generator needs to be manually restarted, and it is necessary before the UPS power supply battery is discharged, and (2) the generator may cause “overvoltage” of the system before shutdown, which may damage communications
Equipment, fire systems, monitoring networks and even UPS power modules. Even worse, after an accident has occurred, it is difficult to separate responsibilities, identify the problem, and correct it. The manufacturer said the UPS power supply system tested unsafe and pointed out that similar equipment in other areas had not experienced similar problems. The generator manufacturer said it was a load problem and could not adjust the generator to deal with the problem. At the same time, the user engineer clarifies the specifications and hopes to be compatible with each other. To understand why accidents occur and how to avoid them (or how to find solutions in critical use), the primary need is to understand the operating relationship between the generator and the load.
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