FUNDAMENTALS OF THEPOWER QUALITY / POWER RELIABILITYSYSTEM APPLICATION PROCESS

摘要

The need for total ride-through of a power outage is becoming more evident, asrnproductivity increases in the manufacturing sector, homeland security assumes increasingrnimportance, and health care practices become more stringent and complex. It isrnparamount that power the proper solution be one that combines power quality (UPS,rnfilters, etc.) on the front end, and power reliability (generator) on the back end to providerna seamless alternate power source.rnPower quality is effectively maintained by correctly matching the power reliability sourcernto the power quality system. By doing some up front research, and applying somernfundamental rules, successful integration of these modules can be affected.rnConsideration of the efficiency and harmonic content of the UPS, its adjustability, andrnfiltering properties when matched to the appropriate generator set are fundamental inrnimplementation. Sizing the system to run in the "sweet spot" is also critical, as most UPSrnand generators operate most efficiently, and cleanly, in the 60 to 90 percent load range.rnIn a basic manner, this paper explores the fundamentals of selecting an emergency powerrnsystem. Key points addressed are UPS to generator sizing ratios, harmonics (what theyrnare and what to watch for), false triggering of the UPS and its root causes, UPS ridernthrough, and genset transient and steady state response