POWER NETWORK RELIABILITY

Shivangi Nupur 11:09 am

Jan 17 • Competition Sample Papers, education, Educcation, Engineering Sample Papers, GATE, GATE Syllabus, General, Notes • 872 Views • 1 Comment on POWER NETWORK RELIABILITY

power network reliability notes

power network reliability

                                                             POWER NETWORK RELIABILITY

 

                                         EFFECT OF WEATHER ON TRANSMISSION LINES

The effect of a new transmission line on an area may depend on the topography, land cover and existing land uses. In forested areas for example , the entire right of way (ROW) width is cleared and maintained free of tall-growing trees for the life of the transmission line. The result is a permanent change to the ROW land cover. In agricultural areas, heavy construction vehicles traverse the ROW and temporarily suspend the use of the land for crop production.

Where transmission lines are routed through areas that are valued  for their scenic qualities, the visual impacts of the line(the area affected) may extend well beyond the ROW. The principal cause of structural failures is weather events that produce loads that exceed the structural loading design criteria. In some cases, failures have been the result of improper design, construction or maintenance practices, or vehicle accidents and some  criminal offensive activities. Examples of weather events that can produce loads in excess of design loads are tornadoes, hurricanes and long return period( low probability) wind and ice storms.

                             COMMON MODE FAILURES

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common mode failures can also be referred to as common cause failure or dependent failure. A precise definition of (CMF) was given as:

A common mode failure is the result of an events(s) which because of dependencies, causes a coincidence of failure states of components in two or more separate channels of a redundancy system, leading to the defined systems failing to perform its intended function.

Recently, in the nuclear power industry , interest has been developing in methods to consider systematic, non random, so called “Common -mode” failures which are not tractable in qunatitive terms using the usual fault tree or relliability block diagram approaches.

SWITCHING AFTER FAULTS

Many computer users automatically assume that every problem they experience must be due to a software bug, but often the cause is far more basic. Badly written music software is shortly followed by the embarrassed admission that the problem in question was due to a faulty audio . The other problems which arises such as switching on your PC and finding that it refuses to boot up at all are obviously down to a hardware problem.

Faults that come and go become the worst ones to track down,  cause of the problem and intend to do something about it, it can disappear leaving you wondering whether or not it’s cured.

                           DISTRIBUTION SYSTEM RELIABILITY

. Available to an unlimited number of users at your utility, Reliability Tracker will help to simplify operations decisions by providing detailed outage summary reports and mobile support for field employees. As a subscriber to this web-based software,  utility will receive an annual national reliability report based on the software data and will earn points toward its Reliable Public Power Provider (RP 3) designation.

Distributed systems need to partition data or state up over lots of machines to scale. Adding machines increases the probability that some machine will fail, and to address this these systems typically have some kind of replicas or other redundancy to tolerate failures. The core argument that gets used for these systems is that if a single machine has probability P of failure, and if the software can replicate data N times to survive N-1 failures.This argument is the core motivation behind most variations on replication and fault tolerance in distributed systems. It is true that without this property the system would be hopelessly unreliable.

The  a fore said article was based on power network reliability.

SOME PRACTICE QUESTIONS AND ANSWERS:

QUES 1) What is common mode failure (CMF) ?

ans-

A common mode failure is the result of an events(s) which because of dependencies, causes a coincidence of failure states of components in two or more separate channels of a redundancy system, leading to the defined systems failing to perform its intended function.

ques 2) To which topic the above said context is related?

ans- this context is related to purely electrical topic.

 

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One Response to POWER NETWORK RELIABILITY

  1. In integrated circuits, electrical power is distributed to the components of the chip over a network of conductors on the chip. Power network design includes the analysis and design of such networks. As in all engineering, this involves tradeoffs – the network must have adequate performance, be sufficiently reliable, but should not use more resources than required. Here the relibility of this power network is beautifully explained.

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