The objects sticking out at an angle on the left side are either vacuum or sulfur hexafluoride (SF6) switches that actually break the circuit before the blades start to open. Apparently the load breaking switches failed, allowing the blades to open "hot" (still energized), thus pulling the arc as they swing to the open position. The arc flashes to an adjacent phase and trips an upstream breaker, extinguishing the arcs.
Clive Ellis If you open the switch on energized and under load,it making arc. It's normal but wrong. Must before open breaker,after open switch. Switches can't break the line under load. If open under load,as you can see It making arc...
@@msmoonbeam91 This is a switch just like a light switch in your home. But because of the high voltage the switch has to be large and the positive and negative terminals have to be very far apart otherwise electricity just jumps across even if the switch is off. They are switching it off in this video but because of electrical load in the network, electricity does not want to 'turn off' so it makes an arc that you can see. makes sense?
That is what happens when the vacuum interrupter unit does not clear the way it should. All seven of the vacuum interrupters in each unit must open within a few milliseconds of each other. That did not happen here along with this impressive result.
The circuit interuption device failed allowing the 3 phase switch assembly to open under load then two of the arcs connected tripping an upstream circit breaker. Believe it or not this was mild compared to some arc faults. Seen some that were blundingly bright with dripping molten metal like a welders arc on steroids frying bits of the substation. The worst case is an arc fault that starts in the power factor correction capacitor bank that continues tll the power transformer overheats and explodes.
Yes but these arcs should never exist in the first place since there are special breakers inside them that break the electricity before these blades are opened so there will not be any arcs. Those breakers are special in that way that no arcs can form inside them.
Not all the time. On those switches that contact that swings down is supposed to break the circuit immediately. But because they didn’t open the breaker first it kept arcing.
@@connorthesledneck1398 Speaking of which, why don't these Grid operators open the breaker first? So many YT videos of switch opening under full load. Why do they do it?
This is NOT how a high voltage switch is supposed to work. Interrupter Bottle failure, probably exceeding its rating by trying to break load or excess loop current. See Joslyn Load Interrupter Attachments.
Anyone in the professional trade will say "WTF"? Normal disconnection of an loaded high voltage circuit - please do not make a fuss about it for a few fingers up. Thanks, BR Zlatko
@@seththemessenger5125 like this one? 43 years in the trade, seen 230 disconnects open hundreds of times, that’s what they do. There is no was to know if there was a breaker operation by viewing that clip. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_m7KbVjj7kc.html
