Posts Tagged ‘transmission lines’

Shielding of MV transmission lines and substations from lightening strokes

December 17th, 2018 | Make a comment | Posted in Electrical Safety
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Lightning strokes are nature’s crude way of disposing-off excess frictional energy dissipation among clouds. Arcs ranging up to thousands of volts break the insulation of air and strike the highest and vulnerable points on ground.

A transmission tower under lightning attack

A transmission tower under lightning attack

If not controlled and provided an alternative path, these surges can destroy almost any structure that comes between their paths to the ground. Read this article by Kam, an electrical engineer who sent us this essay by email.


Top 10 causes for power system failures (part2)

June 18th, 2015 | Make a comment | Posted in Electrical distribution
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Part 1 was about pure electricity, now discover the other causes which are quite surprising!

Tree Contact

power-system-failures-tree-contactTrees that grow very near to the electric poles can pose a lot of threats. They can fall on vital electrical erections during heavy storms, drop branches on conductors, couple two conductors together and can also provide access to various animals that can cause disturbances to the power supply.

This is the reason why most power distribution companies invest a lot of time and money in trimming dangerous trees as a part of preventive maintenance.

When a wet tree branch connects two conductors, current flows for one conductor the other, through the branch slowly.

Flexible AC transmission system (FACTS)

July 16th, 2013 | 1 Comment | Posted in Power quality
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Through the years there has been an increment in the huge amount of power transfers and third party approaches. Despite the fact, electric power transmission facilities throughout the world are not openly allowed to progress because of the different environmental, land-use and regulatory pressures that arise. As a result upholds in transmission, irregular facility usage, and undesirable parallel pathways or loop movements are being experienced.

When there is an increase in power transfer the operating system becomes difficult to manage ultimately becomes complex. Because of this complexity the control on the system becomes weak and the power transfer can become insecure in case of huge power movements.

Flexible AC Transmission System (FACTS) 1

Another issue arising due to this is that complete capacity of the transmission interconnections is not used.

Electric Power Research Institute (EPRI), a US utility industry dealing in combined research and development arm, has now decided to fund Flexible AC Transmission System (FACTS) technology, a solution for the above mentioned problems.

In FACTS solid state devices are employed to keep in check the transmission systems when there is a huge power flow. EPRI along with researchers have invested in FACTS both in terms of its value and capability. Currently FACTS is focusing mainly on the improvement of transmission potential, figuring diverse ways to control power flow, to control the voltage and to add to the lower voltage systems’ plus points.


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