Size of magnetic field from a padmounted transformer?????

Page 1 of 1 [ 9 posts ] 

slave
Veteran
Veteran

User avatar

Joined: 28 Feb 2012
Age: 112
Gender: Male
Posts: 4,420
Location: Dystopia Planetia

11 May 2016, 12:09 am

How can I determine the size of the magnetic field emanating from a padmounted electric transformer???

This video shows the type I am referring to:




The 'rating?' is either 50kV or 75 kV iirc.

Do I need more data than that for a calculation?

Please advise.



ZD
Veteran
Veteran

User avatar

Joined: 30 Oct 2015
Gender: Male
Posts: 589
Location: Manchester, England

11 May 2016, 2:56 am

It should be shielded for the local regulations. Or has one been placed near you and you want to check if it's effecting things?

I can't remember how to do the math any more been to long and only did it for 1 week or something in electronics.


_________________
( If I ignore a reply it's not intentional I get distracted, send me a PM to prompt me :) )


traven
Veteran
Veteran

Joined: 30 Sep 2013
Gender: Female
Posts: 15,369

11 May 2016, 5:31 am

Pad mounted transformers have magnetic fields similar in intensity to kitchen appliances. The magnetic fields near this type of transformer are elevated close to the surface of the transformer. A few feet away, the levels drop off to background. from: http://www.nj.gov/dep/rpp/nrs/powlines.htm
from google: "the size of the magnetic field emanating from a padmounted electric transformer"



Fnord
Veteran
Veteran

Joined: 6 May 2008
Gender: Male
Posts: 60,939
Location:      

11 May 2016, 6:20 am

You need a calibrated gauss meter to measure the magnetic field. The meter should be calibrated for 60 Hz (50 Hz in the U.K.). Unless you know the current through the transformer, the number of windings, the permeability of the core, and the permissivity of the shielding, your calculations will be meaningless.

You need to physically measure the magnetic field.



BTDT
Veteran
Veteran

User avatar

Joined: 26 Jul 2010
Age: 62
Gender: Non-binary
Posts: 7,950

11 May 2016, 7:16 am

Distribution Transformers and EMC - Siemens
www.energy.siemens.com/.../Transformers ... ers/.../...
Siemens
by EFHB Hofmann - ‎Related articles
The electromagnetic compatibility (EMC) of transformers is determined by their stray magnetic fields. These are influenced, above all, by a transformer's rating ...



slave
Veteran
Veteran

User avatar

Joined: 28 Feb 2012
Age: 112
Gender: Male
Posts: 4,420
Location: Dystopia Planetia

18 May 2016, 5:07 pm

ZD wrote:
It should be shielded for the local regulations. Or has one been placed near you and you want to check if it's effecting things?

I can't remember how to do the math any more been to long and only did it for 1 week or something in electronics.


Np.
just want to learn :nerdy:



slave
Veteran
Veteran

User avatar

Joined: 28 Feb 2012
Age: 112
Gender: Male
Posts: 4,420
Location: Dystopia Planetia

18 May 2016, 5:15 pm

traven wrote:
Pad mounted transformers have magnetic fields similar in intensity to kitchen appliances. The magnetic fields near this type of transformer are elevated close to the surface of the transformer. A few feet away, the levels drop off to background. from: http://www.nj.gov/dep/rpp/nrs/powlines.htm
from google: "the size of the magnetic field emanating from a padmounted electric transformer"


TY very much....i read the link! :nerdy: :D



slave
Veteran
Veteran

User avatar

Joined: 28 Feb 2012
Age: 112
Gender: Male
Posts: 4,420
Location: Dystopia Planetia

18 May 2016, 5:20 pm

BTDT wrote:
Distribution Transformers and EMC - Siemens
http://www.energy.siemens.com/.../Trans ... ers/.../...
Siemens
by EFHB Hofmann - ‎Related articles
The electromagnetic compatibility (EMC) of transformers is determined by their stray magnetic fields. These are influenced, above all, by a transformer's rating ...


TY!



slave
Veteran
Veteran

User avatar

Joined: 28 Feb 2012
Age: 112
Gender: Male
Posts: 4,420
Location: Dystopia Planetia

18 May 2016, 5:32 pm

Fnord wrote:
You need a calibrated gauss meter to measure the magnetic field. The meter should be calibrated for 60 Hz (50 Hz in the U.K.). Unless you know the current through the transformer, the number of windings, the permeability of the core, and the permissivity of the shielding, your calculations will be meaningless.

You need to physically measure the magnetic field.


Touche.

(Aside: to all.....btw i was afk for a while unexpectedly
Ty all for your rapid replies
forgive my tardy reply :oops: )

I get the impression that EU uses a larger "safe human distance" from Power Lines than does USA/CAN.

Any thoughts on the effect of even low milligauss fields on human health?

There are EPIC am'ts of obvious BS online about this topic...I'm just trying to find the truth...and I am unqualified in this discipline.
I'd appreciate any input.

Many thanks for sharing your knowledge. :D



cron