1) OLD GUIDELINES ARE NOT THE BEST GUIDELINES Guidelines like the Computer Business Equipment Manufacturers Association Curve (CBEMA, now called…

The three major factors contributing to the problems associated with power quality are: USE OF SENSITIVE ELECTRONIC LOADS The electric…

The Institute of Electrical and Electronic Engineers (IEEE) defines power quality as: “The concept of powering and grounding electronic equipment…

The term power quality (PQ) is generally applied to a wide variety of electromagnetic phenomena occurring within a power system…

VOLTAGE DIP is a reduction in the RMS voltage in the range of 0.1 to 0.9 pu (retained) for duration…

1. What is the “end of useful life”? The IEEE defines “end of useful life” for a UPS battery as…

Quantifying the combined effect of the four factors that affect battery life discussed in the previous page is difficult. You…

In most UPSs, you don’t use just one cell at a time. They’re normally grouped together serially to form higher…

Batteries have limited life, usually showing a slow degradation of capacity until they reach 80 percent of their initial rating,…

A generating station which utilizes the potential energy of water at a high level for the generation of electrical energy…