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holmslaw
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11kv Circuit Breaker
- Thread starter efiste2
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The switches are 11kv GEC BVP17 Circuit breakers.........sorry i should have been clearer with the busbars, there are only 3 per unit (one per phase) and run the length of the switchboard(not sure why there are only five in the pic) and the elongating of the connection is normal, HV in this case 11kv, has no Neutral conductor. (excluding secondary sides of local primary transformers)
Which then asks the question:
On the LV side of a private HV network transformer, where the neutral is tied to an earth farm and the LV board is fed by 3P + N + E, is this a TN-S or TN-C-S supply?
On the LV side of a private HV network transformer, where the neutral is tied to an earth farm and the LV board is fed by 3P + N + E, is this a TN-S or TN-C-S supply?
That would depend on the cable type between the Tx and the cutout supplying the LV dist board.
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5 core RF.
TN-S then I reckon
Fascinating stuff, but I am well out of my depth with this.
Any more pics of one in use
Any more pics of one in use
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the n-e bond is in the switchroom just before the ACB in my installation
oh, and we call it PNB
oh, and we call it PNB
At Scot Power the Neutral on the LV side of the 11000/433 tx is tied to Earth at the LV distribution board. On the pic you can see the link just above the small red caution notice, and the braids that connect the lead sheath of the incoming LV cables to the substation earth. and also the Transformer LV busbars connecting to the Air Circuit Breaker on the L/H sude of the pic
i've seen a HV breaker after its kicked off in a simular fashion, that was in a mine and it was caused by the gear getting damp after some donut turned the heating off 
you can see why the boys who operate them often use a remote switching device
bit i like most is when u rack them back in and you get the hiss as the contacts get close to each other......
you can see why the boys who operate them often use a remote switching device
bit i like most is when u rack them back in and you get the hiss as the contacts get close to each other......
Im authourised to switch 11kv on Scot Power Networks, and Phasing out across 11kv circuits is always a good one for the "hiss" but its the hiss from racking up 33kv breakers that really makes the hair stand up on the back of your neck, but they dont let me switch that yet
I'm pretty sure BVP17 was oil gear, I think that may be GEC VMX C gear. From an HV customer last year?
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