Its pretty crazy seeing the high current conductors in industrial arc furnaces. The conducting cables sway and dance from the powerful magnetic fields. 😮
I saw this comment before the music kicked in and thought that you were being too generous and that it was going to be just ok production music. But no-it really does go hard.
Transient tubular displacement and clashing of the sub-conductors under high root mean square current conditions, combined with kinetic impulse effects on the droppers was indeed of significant concern.
I always had a hunch galloping high tension lines was from extreme currents opposing opposite magnetic fields in other phases and or magnetic Flux of earth. Awesome presentation
Most of that is from wind and maybe weight changes from ice suddenly falling off. It's rare, but still designed for, for an actual short to occur. The forces from normal load current are generally negligible.
There was some very large lines I would drive by sometimes, I'm guessing around 350kV. Light drizzle raindrops would pop and cause the lines to really start resonating, quite interesting to watch.
Sight of this must influence every protection engineer to ensure that the systems operate correctly and disconnect faults as rapidly as the system requires. It is a given that the switchgear operates correctly under fault conditions. In the UK NG require fault clearance in 80/100/120/120ms for 400/275/132/66kV. A significant amount of energy can be spent in 80ms at 400kv typically at 50kA with ratings of [i think] 35000MVA.
I have one basic doubt, which I would like you to clarify. As per BIS, the transmission towers are designed based on working tension, wind force and self weight of conductors and insulators. But there is no mention of SCF in design of transmission towers. It is only applicable to the design of structures within AIS. I would like to know the exact reason, why SCF is not applicable in transmission towers. Also, for the incoming gantry tower, what forces need to be considered for structure design.
I *think* that the wider spacing of conductors on lines would generally result in much lower short-circuit forces than in switchyards where minimum clearance is necessary to maximise density.
This is true, but the increased length of conductor between towers means the short cct force goes up again. There's another factor to consider however and that's the component that fails from short cct force. The weakest point in AIS is the post insulators which the conductor is sitting on. These are weaker than the steel structures beneath and are what snaps. On a transmission line, string insulators are used instead of post insulators, which can cope with a higher force as they are under tension only. They don't experience cantilever forces. I've not done much design on transmission towers so I'm not sure what's standard for them. Just saying that the assembly is different.
Its pretty crazy seeing the high current conductors in industrial arc furnaces. The conducting cables sway and dance from the powerful magnetic fields. 😮
Love the spacey synthesizer background music. Like Vangelis or Tangerine Dream. Great choice by the original film makers. I salute you 👍
I saw this comment before the music kicked in and thought that you were being too generous and that it was going to be just ok production music. But no-it really does go hard.
I love the video quality. Brings back memories of mpeg coding
Transient tubular displacement and clashing of the sub-conductors under high root mean square current conditions, combined with kinetic impulse effects on the droppers was indeed of significant concern.
I always had a hunch galloping high tension lines was from extreme currents opposing opposite magnetic fields in other phases and or magnetic Flux of earth. Awesome presentation
Most of that is from wind and maybe weight changes from ice suddenly falling off. It's rare, but still designed for, for an actual short to occur.
The forces from normal load current are generally negligible.
You would be wrong...
@@Look_What_You_Did They got an explanation four months ago...
There was some very large lines I would drive by sometimes, I'm guessing around 350kV. Light drizzle raindrops would pop and cause the lines to really start resonating, quite interesting to watch.
Incredible forces and incredible currents! And all of them must be kept below a contact voltage of 25 V.
Good video on understanding short circuit force!
Ultimate video , never saw such type . Hope u create more
Sight of this must influence every protection engineer to ensure that the systems operate correctly and disconnect faults as rapidly as the system requires. It is a given that the switchgear operates correctly under fault conditions. In the UK NG require fault clearance in 80/100/120/120ms for 400/275/132/66kV. A significant amount of energy can be spent in 80ms at 400kv typically at 50kA with ratings of [i think] 35000MVA.
Wow! Good thing I saw this. Not knowing this kept me up most nights.
It's quite insane that all of that is just caused by electrons bumping into metal atoms.
can you upload next video please
I have one basic doubt, which I would like you to clarify. As per BIS, the transmission towers are designed based on working tension, wind force and self weight of conductors and insulators. But there is no mention of SCF in design of transmission towers. It is only applicable to the design of structures within AIS. I would like to know the exact reason, why SCF is not applicable in transmission towers.
Also, for the incoming gantry tower, what forces need to be considered for structure design.
I *think* that the wider spacing of conductors on lines would generally result in much lower short-circuit forces than in switchyards where minimum clearance is necessary to maximise density.
This is true, but the increased length of conductor between towers means the short cct force goes up again. There's another factor to consider however and that's the component that fails from short cct force.
The weakest point in AIS is the post insulators which the conductor is sitting on. These are weaker than the steel structures beneath and are what snaps. On a transmission line, string insulators are used instead of post insulators, which can cope with a higher force as they are under tension only. They don't experience cantilever forces.
I've not done much design on transmission towers so I'm not sure what's standard for them. Just saying that the assembly is different.
Wow! These designs don't seem very robust or safe! Doesn't seem like a good idea to have electrical cables randomly swinging around!
Talkalotcrapper
Speak american.
Uhm... 11:06
Did you notice how all the work whs done by europeans, maroccans, and canadians?
American is not a language. More an odd dialect of proper English.