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Emission Values of Transmission Line Terminals Having More Than 10 Years in Operation - Chesf

From Flir Systems Incorporated
 

 
The loading of a transmission line involves many variables, from which the following deserve to be highlighted: Climatic conditions - wind, environment temperature, humidity, pollution; Conductor line - nominal current, line's surface material; Thermal limit for which the TL - Transmission Line - was projected. Various parameters are involved in the calculation to reach the loading value, among which are the emissions and absorption coefficients of the line's surface material. These coefficients have great influence in the loading limit calculation because they determine how much thermal energy will be radiated and how much will be absorbed by solar incidence. This last one preponderates during the day and in sunnier regions, reducing the loading limit permitted to avoid the TL to exceed the project's thermal limit. The following illustration shows the process of the thermal exchanges associated to the TLs:
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Topics of Interest
EFFECTS OF SOUND LEAKS ON TL The graph below shows the reduction in TL caused by sound leaks such as unsealed open joints, openings in electrical boxes, and the like. For example, an opening only... (Read More)
VIBRATION OF BUILDING ELEMENTS Sound waves impinging on building elements, such as walls, floor, or ceiling, produce back-and-forth motion. The magnitude of this motion or vibration depends on the... (Read More)
EXAMPLE PROBLEMS (TRANSMISSION LOSS) Find the TL of a material that has a sound transmission coefficient ? of 6.0 10 ?4. The TL of a heavy concrete block wall construction is 40 dB. (Read More)
Linearization Factor, F lin (General Requirements for Linearity) Let us define, at first, the yield or efficiency of the thermoluminescent emission, ?, from a material having a mass m, as the ratio... (Read More)
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