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#207718 - 11/21/12 08:33 PM MPBS - Mobile Phone Base Station  
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Quote
Two sets of photos, one is a newish design of installation known as MPBS - Mobile Phone Base Station and is designed to allow mobile phone masts to be installed on existing HV transmission towers taking its supply from MV supply via a transformer

The other two are just examples of MV transmission, but vertically aligned, due to the other set being removed.

John Orme

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#207808 - 11/28/12 05:38 PM Re: MPBS - Mobile Phone Base Station [Re: Admin]  
geoff in UK  Offline
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Joined: Dec 2002
Posts: 184
UK
I've noticed that sort of base station on HV pylons and two thoughts come to mind. 1 Does the HV transmission system have to be shut down for them to be worked on? and 2 Are there special measures incorporated to overcome EM interferance? The field strength must be enormous where they are located.


#207819 - 11/29/12 02:28 AM Re: MPBS - Mobile Phone Base Station [Re: Admin]  
gfretwell  Offline


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Joined: Jul 2004
Posts: 9,113
Estero,Fl,usa
It looks like they locate the antenna low enough to get NESC clearance to the HV lines and I doubt a cell tower can even see 60hz.


Greg Fretwell

#207912 - 12/07/12 11:24 AM Re: MPBS - Mobile Phone Base Station [Re: Admin]  
harold endean  Offline
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Joined: Feb 2002
Posts: 2,233
Boonton, NJ
I have seen cell tower horns on HV transmission tower, but I thought it was only there for support, not for power.


#208099 - 12/26/12 12:00 PM Re: MPBS - Mobile Phone Base Station [Re: Admin]  
johno12345  Offline
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Joined: Sep 2005
Posts: 96
United Kingdom
They are designed to be worked on while everything is live, but the equipment on the ground has to be outside the circle of influence from earth faults on the tower.

the transformer on the 11kv pole can only supply the one single base station


There are a lot of fibre optic cables on HV transmission pylons here, its wrapped around the top earth conductor


I took my time, I hurried up, The choice was mine, I didn't think enough


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