TRANSMISSION LINES DESIGN and ELECTRICAL ENGINEERING HUB

I would like to share this interesting video. It is about a proposed project linking the renewable energy sources plants in Canada up to New York through underwater cables. It pretty much discusses the overhead transmission lines and the opposition on it and how builders find ways to deliver power despite and due to the many problems encountered in building overhead transmission lines. New Underwater Transmission Lines Proposed original URL:  http://www.dailymotion.com/video/xdl8s3_new-underwater-transmission-lines-p_news

The Ruling Span is defined as the assumed uniform span that most likely represents actual spans that are in any particular section of the line. In the absence of finite element analysis tools or software (ex. PLS CADD), the ruling span is used to calculate sag and clearances on the plan profile drawing, and it is necessary in structure spotting. Ruling Span Tip: When stringing the line, the general rule is that the spans in the line should not be more than twice the ruling span, or less than half of the ruling span. Ruling Span is one of the most used yet misunderstood and misused terms in the design, staking, and construction of overhead lines. “Ruling span” is loosely used with several different meanings. Theoretical Ruling Span: It is the equation derived from the co nductor length equation and by making certain assumptions, approximations, and formula substitutions. This formula must be used if the actual spans are already known.   The theoretical ruling span...

SPOTLIGHT: HIGH VOLTAGE DIRECT CURRENT (HVDC) TRANSMISSION LINES During the current wars (AC vs. DC) days, it was the economics of transmitting power in high voltage and low through power transformers sealed the fate in favor of AC power transmission. But nowadays, Direct Current is fighting back. Or that least, it is covering what AC power transmission cannot. Most if not all of the bulk transmission of powers are in AC. That was up until 1954, the firstHVDC (10MW) transmission system was commissioned in Gotland . It is of important to note that as early as 1941; a proposed 60 MW HVDC link in Germany did not fully materialize due to war. HVDC is favorable to AC transmission on the following reasons: . No technical limit to the length of a submarine cable connection. . No requirement that the linked systems run in synchronism. . No increase to the short circuit capacity imposed on AC switchgear. . Immunity from impedance, phase angle, frequency or voltage flu...

Transmission Line Restoration From July 17 Wind Storm Completed   Sep 9, 2010 10:40 PM Restoration of Nebraska Public Power District's 230-kV transmission line, severely damaged in a July 17 wind storm, was completed when the line was re-energized Monday, Aug. 30. Crews completed restoration work on a section of the line between the District's Riverdale substation, located north of Kearney, to a substation east near Grand Island Monday afternoon. A total of 129 structures were damaged on the line, with approximately 18 mi of power lines coming to the ground. Earlier, another section of line, running west from the Riverdale substation to Crooked Creek substation, north of Lexington, was restored August 22. That section of line saw 87 structures damaged with 14 mi of line down over two separate sections. A third transmission line, running from Riverdale to the Tower substation in Kearney, had an additional eight structures damaged with about one mile of line being ...

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The most common way method of transmitting power is through overhead power lines. It is relatively less costly, visible detection of faults, repair and maintenance is easier compared to underground system. The following are the basic components of an overhead power line (click on links to see pic): Supporting structures • Phase conductors • Ground conductors or overhead ground wires (OHGW) • Insulators • Line Arresters • Tower/pole grounds • Supporting guys and anchors • Other line accessories 

Electricity as most of us know, are conveniently utilized as we plug our appliances and machines to our power sockets. However, the origin of that very electricity though may actually be as far as hundred and even thousand of kilometers away. These are from power plants and other power generating stations. A generating plant will be useless unless its generated energy (power) in millions and even thousands of billions of watts will be delivered to its consumers, to us. These electrons traveled in speed approaching that of light, through a medium called transmission and distribution lines. Electricity might be transmitted and distributed in either on the following ways( click on link for pics ): OVERHEAD UNDERGROUND UNDERWATER/ SUBMARINE The choice and selection of methods of construction would usually vary on the philosophy of the personalities and circumstances involved. These would refer to the owner of the lines, the engineering team and the culture, practice and applicability where...

Greetings everyone. One of the most useful forms of energy ever utilized is in the form of electricity. It is a primary if not the sole contributor in the advent on human history and civilization. It is almost impossible to imagine living today without electric power. Without it, you won't be reading this blog, since nothing will power your computer. One of the most visible and profound units of the electrical power system are its transmission and distribution lines. Lines, wires, cables, it is almost everywhere and yet it is as if it is nothing to most of us. But the creation, design and construction of these lines, the engineering behind in itself is a wonder to behold. The evolution, from the site and draft process to the use of sophisticated software like PLS-CADD makes the study of craft even more exciting. This blog aims to give everyone an overview, a brief understanding and resources in understanding and appreciation of the art and science of transmission and distribution l...