Didcot power station 33KV incident 18/08/19

[Pete999]

I looked at Rachel Barbaresi's clip in #1 - with a bit of close observation one can see the conductors stationary and then vibrating. Click on enlarge bottom right before play.

Done that Marconi, honestly can't see a difference must be me cus I dont discount your theory all I see is 3 wires shaking, we must be looking at different pictures. Could you link the frame cus I'm avin an epi trying to understand, sorry Mate.

 

[Pete999]

Marconi, you aren't often wrong, in fact I have always respected your views I am obviously missing something here, would love to clarify but all I can see is three wires shaking and they appear to me as though they are going straight to ground ie Stay cables.

 

[Lucien Nunes]

In the second clip, there are some 33kV lines that are stationary at first immediately after the demolition. Then you see a small flashover at one insulator stack, then once the sub flashover happens in the distance and you hear the arcing, the nearby lines (which are not arcing) start twanging up and down like rubber bands.

 

[UKMeterman]

I have seen in some twitter comments that initaly SSE and their control room stated it had nothing to do with the demolition. I do wonder if somene tried a remote reclose. It is rather poor that their control room didn't know when the demolishion was going to take place and lock out any auto reclose.

 

[marconi]

Pete999 - take a decko at :

at about 6.15 mins in (but the preceding is interesting too). These are tests on HV/EHV installations and lines which have been done to help produce mathematical models of short circuit situations and their effects. I think I underestimated the short circuit current.

Like most engineering, there is more to consider than first meets the eye.

 

[marconi]

Pete999 - sorry could not reply to you earlier - in a rush last night.

No you are not misinterpreting those stay wires with yellow tubing at their lower ends. That they too vibrate I think is either because the span conductors have been twanged (good word Lucien N) by Messrs Ampere and Lorentz thereby pulling the pylon forward against these stays; or there is an earth fault current through them. I tend to the former as the reason.

Good pictures to show friends and relatives to advise them not to linger under or near power lines.