![anaheim aac pls cadd cable file anaheim aac pls cadd cable file](https://googlified.com/wp-content/uploads/2019/09/Bitwings.png)
If it has been operated above design limits, damage could have already occurred. It sounds like you may have your work cut out for you getting the money to fix this problem. Without a detailed survey/study of the power line and an inquizative engineer, it will not be obvious there is a problem developing. If there is a calculated clearance violation, and there is not a fault, is it still a clearance violation? There is clearly a different response between a) an operator seeing a 50 year old drawing with a limit that has been exceeded regularly in the past with nothing bad happening and b)power lines sagging so low they actually touch something or the public notices. We are currently doing LiDAR surveying and PLS-CADD modeling to check how addition capacity can be realized from actual condition vs. For example, our sub transmission was typically designed about 8 ft higher than NESC requirements to allow for survey and construction tolerances along with future underbuild or road elevation changes. And of course, it could be even hotter and calmer than the condition you pick.Ģ Lines may be designed to more than NESC clearances and may include addition construction buffers.
Anaheim aac pls cadd cable file code#
Without monitoring, they may be in code violation. Dispatchers could then (at least theoretically) run it up to the design temperature all the time, not just on the hottest, sunniest, and also calmest day of the year. There are a number of devices that claim to measure the temperature of the conductor by either measuring sag, measuring tension, measuring the surface temperature using infrared or by measuring both the current and the weather conditions. The steady-state thermal rating is 829.9 amperes Given a maximum conductor temperature of 167.0 (deg F), and solar azimuth is 180 deg.)ĭay of year is 172 (June 20) (day of the year with most solar heating) Sun time is 12 hours (solar altitude is 71 deg. PLS-CADD Version 7.30+ 5:48:28 PM Thursday, August 11, 2005Īngle between wind and conductor is 90 (deg)Ĭonductor elevation above sea level is 200 (ft)Ĭonductor bearing is 270 (deg) (perpendicular to solar azimuth for maximum solar heating) Just because the current is higher than rated doesn’t necessarily mean annealing has occurred. The following is an example of a conductor temperature calculation input to IEEE 738 in PLS-CADD. However, the line must be designed to ALWAYS meet clearances.
![anaheim aac pls cadd cable file anaheim aac pls cadd cable file](https://www.mdpi.com/computation/computation-07-00063/article_deploy/html/images/computation-07-00063-g004-550.jpg)
The temperature rating is specified with a number of factors that do not always occur simultaneously such as low wind and high temperatures. Overloaded lines sagging and faulting did not occur until the system was already collapsing.įor utilities that do a better job with vegetation management, or that are in non vegetated areas, the dispatchers may be able to have more current due to 3 reasons.ġ. Loading was only 44%, 88% and 93% of the ratingsĪgain in 1996, it was poor tree trimming, not overloaded lines that caused the intial problems. Jghrist points out “Lines sagging into trees can cause problems…Although this was because of poor tree trimming not overloaded lines” In fact, poor tree trimming caused all three of the critical 345 kV phase 3 outages.