ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Explored: Basics of PLC
by niamishra. 10/19/18 04:44 AM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/18/18 08:47 PM
220/230/240V 60Hz Systems
by dsk. 10/17/18 01:25 PM
PLC/HMI Enclosure C2, D1
by ghost307. 10/16/18 03:31 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
1 registered members (NORCAL), 35 guests, and 24 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
MPBS - Mobile Phone Base Station #207718
11/21/12 08:33 PM
11/21/12 08:33 PM
Admin  Offline
OP
Administrator
Member
Joined: Oct 2000
Posts: 3,517
NY, USA
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

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

Tools for Electricians:
Re: MPBS - Mobile Phone Base Station [Re: Admin] #207808
11/28/12 05:38 PM
11/28/12 05:38 PM
G
geoff in UK  Offline
Member
Joined: Dec 2002
Posts: 193
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.

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

Member
Joined: Jul 2004
Posts: 9,298
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
Re: MPBS - Mobile Phone Base Station [Re: Admin] #207912
12/07/12 11:24 AM
12/07/12 11:24 AM
H
harold endean  Offline
Member
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.

Re: MPBS - Mobile Phone Base Station [Re: Admin] #208099
12/26/12 12:00 PM
12/26/12 12:00 PM
J
johno12345  Offline
Member
Joined: Sep 2005
Posts: 97
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

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,430 Are you busy
188,033 Re: Forum
177,614 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.022s Queries: 15 (0.004s) Memory: 0.9710 MB (Peak: 1.1116 MB) Zlib enabled. Server Time: 2018-10-19 13:38:07 UTC