As a sequel to the discussion of adjustable speed drives (ASDs) in last month’s column, it seems appropriate to show how ASDs are a classic example of the often-quoted line from IEEE 1100 (also known as the Emerald Book).
In a recent article, we briefly discussed the concepts of efficiency and effectiveness with regards to power consumption. It was timely with all the press coverage lately about being “green,” reducing one’s carbon footprint, lessening global warming effects and the like.
Being a member of the Technological Committee for my local school district since its 1994 creation, I have seen first hand the exponential increase in the number of computers, servers, printers, white boards, digital cameras and other technology tools for faculty and students to access each other a
At a recent training session in Washington, DC, we plugged a power quality monitor into a baseboard outlet to get data to illustrate the different parameters and characteristics of voltage and current waveforms.
In the September issue of ELECTRICAL CONTRACTOR, there was an Industry Watch story titled “Efficiency from the Wall to the PC,” about an organization that is campaigning for more efficient power “cords.” There was a reference to a quote indicating only 50 percent of the power that leaves the outlet
The term “carbon footprint” is often applied to industrial facilities, where significant consumption of various forms of energy is measured against the effects on the environment as compared to the product output.
One of the expressions I remember hearing during my childhood was “Mind your P’s and Q’s.” When I would ask where that expression came from, it usually resulted in another popular expression, such as, “Don’t talk back to your elders.” With the benefit of the Internet, the answers are there, but the
IN“The Velveteen Rabbit” by Margery Williams, the Rabbit asks the Skin Horse, “What is Real?” A customer reminded me of this line when he asked a similar question in regard to the parameter watts used to measure electrical power.
The acronym “PQ” most often is associated with power quality, but some people use it to represent power quantity. The latter is more commonly referred to in today’s technical community as energy management. The commonality between the two is further seen in the instruments used to measure such.
Among the responsibilities of numerous working groups and task forces of the Power Quality Subcommittee under the auspices of the Transmission and Distribution Committee of the Power Engineering Society of the Institute of Electrical and Electronic Engineers (or more simply, the IEEE PES T&D PQ
According to the most recent data from the United States Fire Administration, home electrical problems are responsible for an estimated 67,800 fires every year, resulting in 485 deaths, 2,300 injuries and more than $868 million in residential property loss. The U.S.
The truth about transient voltage surge suppressors A series of fatal fires recently have put transient voltage surge suppressors (TVSS) to the forefront of news again. It wasn’t necessarily the normal application of such devices that created hazards.
In April 23-26, 2007, the inaugural GridWeek event took place in the Ronald Reagan Building in Washington, DC. The purpose was to raise awareness and generate support for advancing and modernizing the grid and bring attention to an impending problem.
The focus of this column is usually on power quality or variations in voltage provided by the source that are the result of interactions with the load and source impedances, as well as the voltage and current requirements of the equipment using the electricity to provide useful and often uninterrup