Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 18 replies
  • Subscribers 32 subscribers
  • Views 3147 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Distance between Extra high voltage transmission lines and residential buildings

MAS
Hi all,


I have a querry regarding the Extra high voltage transmission lines (EHV AC)


I would like to know the international standards for maintaining a safe distance from overhead transmission lines of 132 KV & 400 KV passing by residential plots where the cluster of residential high rise/super high rise towers are planned to be executed.


Appreciate advices from experts


Thanks & Regards

MAS
  • 0
    UKPN:

                     Height of Line Conductors:


    Not exceeding 33,000 volts  5.2 metres


    Exceeding 33,000 volts, not exceeding 66,000 volts, 6 metres.


    Exceeding 66,000 volts, not exceeding 132,000 volts, 6.7 metres.


    Exceeding 132,000 volts, not exceeding 275,000 volts, 7 metres.


    Exceeding 275,000 volts, 7.3 metres.


    For those interested, UK Power Networks takes energy from National grid at 400kv at a Grid supply point (a substation) and steps it down to 132kv for distribution locally.


    Regards, UKPN


    In addition to the heights of the line conductors I also want to know the minimum distance that has to be maintained  from the base of pylon/tower to any nearest residential plot limit of the development in which the developer wants to build residential towers.


  • 0

    the minimum distance that has to be maintained  from the base of pylon/tower to any nearest residential plot


    That is more complex, as the buildings may be built nearer if extra precautions are taken with  metallic services, pipes and things like phone lines etc, so that any EHV fault or lightning induced current does not cause the property to rise in voltage relative to the rest of the earth by some amount.


    What can be done at what distance is site specific advice,  and usually involves  survey and some sums.


    You'd not normally want residential structures because of considerations of noise and visual impact, as well as possible TV and Radio interfernce from insulator discharges, and  the lines will need periodic access for maintenance.

    The pylons are better offset from  the development, so folk see the wires but the pylons proper are obscured by buildings, and as far as possible the lines run over agricultural land or parks or similar, where no one sleeps and vehicles can be got in quickly if need be.

    try appendix 9

    Mike

  • 0
    mapj1:

    the minimum distance that has to be maintained  from the base of pylon/tower to any nearest residential plot


    < 10 m if this one is anything to go by.


  • 0
    Chris Pearson:
    mapj1:

    the minimum distance that has to be maintained  from the base of pylon/tower to any nearest residential plot


    < 10 m if this one is anything to go by.




    Could that be an optical illusion Chris?


    Z.


  • 0
    Have a look at 53.189425 -3.045233 on Google Earth. Better still use Street View.  That is close.


    The pylon and others on that route are sited on a disused track bed of a mineral railway between Queensferry (in Flintshire) and what I believe was the site of Hawarden Electric, a coal fired power station pre WW2. Now the site of a 132/33 kV substation. Apparently the track bed was purchased in the mid-1950s by MANWEB (now part of Scottish Power. An easy way to obtain a wayleave?


    I have never found much out about it being a power station, but one of their customers during WW2 was the Tube Alloys Project and according to their supply plans was supplied at 3.3 kV, which for the distance 10 km as the crow flies, was perhaps a little on the low side?  (Besides the Tube Alloys Project, the site was also used for the production of Mustard Gas).


    Clive
  • 0
    Satview on Chris's picture makes it more like 15m but I agree its pretty close - closer than I would expect actually. It would be interesting to know the voltage, it may be possible to light a hand held florry tube standing in the childrens playground.


    also makes you wonder they did  the grounding of the 11kV (?) subs in the plastic box in the cul de-sac of Rockswell close with 'Curly' spray painted on it.


    Mind you not all pylons / towers near houses actually are EHV.
    this and this  are opposite ends of the same span - the really small (all things relative...) insulators tell us it is not as EHV as we think, just made up extra tall to get up and over the housing estate. They do not buzz like the higher voltage cousins.

    Mind you , I have no idea how common that sort of trick is.

    Mike.
  • 0
    I remember in the Post Office a technician being examined by a board of senior engineers for promotion to Technical Officer. He was asked what steps he would take if he saw flames around the valve of an acetylene bottle. After a lengthy pause he replied, " f***ing big ones". End result failed board another 3 months training before re-boarding.
  • Former Community Member
    0 Former Community Member
    Mind you not all pylons / towers near houses actually are EHV.
    this and this  are opposite ends of the same span - the really small (all things relative...) insulators tell us it is not as EHV as we think, just made up extra tall to get up and over the housing estate. They do not buzz like the higher voltage cousins.

    Mind you , I have no idea how common that sort of trick is.

    Mike.


    Similarly this is only 33 kV as evidenced by both the insulators and the 1950s signage. Drops down to wooden poles a mile or two away here. It would in fact appear to interconnect with the one you mentioned.


    I'm unsure if there was an intention to upgrade it later, the pylons would appear to be designed to allow either the 6 cables to be much more widely spaced than they currently are, or perhaps to double-up to four 33 kV circuits. Who knows.


Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines