Just A Couple Of Pics

[Guitarguy]

I know how much you guys like pics of rickety ancient electrics so i thought i'd share these with you. I had to go and do testing on this feeder pillar in this substation a couple of days ago and took a couple of pics. It's an open busbar type- that's right three metal busbars completely exposed with 3 phases live. It dates from probably the early 50's. The other pic is of- i think the curcuitry that controls the street lamps connected to the 5th core of the PILC cable.

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[ricicle]

Proper kit !

 

[Guitarguy]

it all looks like something out of a frankenstine film! especially that old knife switch!

 

[westie101]

Nice, 3 ways with spring contact fuse holders, one converted to wedge type. It's even still got the sockets to allow fuses to be changed without loss of supply

 

[westie101]

A modern one after going BANG!

11kV OCB and water do not mix!

Outdoor pillar (in poor condition and due to be replaced) during fault finding operations!

 

[Guitarguy]

Yeah get the old rezap on it and blow it to bits!!

 

[Stoday]

50 years ago (!) I came across some water insulated circuit breakers in Leicester power station.

 

[ricicle]

50 years ago (!) I came across some water insulated circuit breakers in Leicester power station.

De-ionised water I hope !

 

[efiste2]

I know you guys know, but I always find it funny when Joe public or factory maintenance electricians see how old and sometimes how knackered the switchgear is that is supplying them.....a huge chunk of most DNO networks switchgear is over 50 years old....but to be fair its the older stuff that can take the big bangs...

but to be fair its the older stuff that can take the big bangs ...the new SFG gas stuff is designed to explode in a certain way to direct any blast away from operators....

 

[RF Lighting]

Can anyone tell me why DNO equipment tends to have the phases in the opposite order to normal?

 

[securespark]

Just because they can get away with it.

 

[ricicle]

Can anyone tell me why DNO equipment tends to have the phases in the opposite order to normal?

Depends which way you are looking at the switchgear !

 

[efiste2]

There are many Local Pase shifts in my DNO, Southport for instance the 11000/415v transformer HV side is connected BLUE YELLOW RED from Left to right and then crossed back again on the LV distribution board, which I believe produces a 30 degree phase shift........Liverpool city centre has a B R Y phase cross that remains unchanged on the LV side.....The old school rule of thumb for Switchgear in SP is, excluding Transformers is "RED RIGHT REAR" ie when looking at the rear cable box Red is on the right, when looking at the right box red is on the rear.....

 

[Spark123]

A Delta-Star transformer causes a phase shift of 30degrees iirc.

 

[westie101]

phases in the opposite order to normal

It varies within companies, where I am based it is the standard Red Right Rear though we do have a lot of overhead lines with red in the centre.

A City about 35 miles away has a variety of phase shifts
It seems to be mainly historic and a carryover from pre-nationalisation days