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Re: Norwegian power? [Re: Meadow] #219218 03/30/18 07:10 AM
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dsk Offline
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Things takes time, the building process is not finished yet, and the cable are still running trough the house. :-)

dsk

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Re: Norwegian power? [Re: Meadow] #219567 08/28/18 01:54 PM
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dsk Offline
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They has had proffesionals there now, and the cables are now propery put in the ground with the right kind of cable, and terminations.

Attached Files 2018-08-18 11.00.33.jpg
Last edited by dsk; 08/28/18 01:58 PM.
Re: Norwegian power? [Re: Meadow] #220040 04/19/19 09:29 AM
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dsk Offline
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I am wondering how they will do it, but someone was telling me that they want to convert the area from 230V TT to 400/230 TNC-S

My guess will be a transformer with both voltages, and dirstibution of of the 400V system to new houses.


Re: Norwegian power? [Re: Meadow] #220043 04/20/19 05:27 PM
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Texas_Ranger Offline
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They could convert the existing buildings too, it'd take new cables and some inside work too. I guess a dual-voltage transformer wouldn't be enough for running both systems in parallel since the old setup requires a floating star point (IT) while the new one needs an earthed one (TN).

Re: Norwegian power? [Re: Meadow] #220050 04/26/19 02:56 AM
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dsk Offline
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The old system is a TT system so it will probably be OK, In the neighborhood they even have a transformer with 2 separate secondary winding's too.

dsk

Re: Norwegian power? [Re: Meadow] #220058 05/02/19 07:01 PM
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Texas_Ranger Offline
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I suppose they could convert the older parts to 133/230 V TT if they're currently 133/230 IT with earthed local PE. That'd be the Belgian system, once common in quite a few European countries. They'd still need a transformer with separate secondaries I guess. If all existing supplies are single phase (i.e. only two out of the three phases are supplied, giving 230 V) they could replace the distribution and reconnect the existing buildings to 230 V line to neutral instead.

Re: Norwegian power? [Re: Meadow] #220062 05/03/19 03:30 AM
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dsk Offline
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It is already 133/230 TT, so I guess that is the way they will do it.

Re: Norwegian power? [Re: dsk] #220764 04/29/20 11:54 AM
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WaterIngress Offline
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Originally Posted by dsk
It is already 133/230 TT, so I guess that is the way they will do it.



138/240Y TN-S without the neutral distributed is an ideal system.

If I'm not mistaken 127/220Y is very common in South America.



Re: Norwegian power? [Re: Meadow] #220819 05/27/20 10:43 AM
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WaterIngress Offline
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Here is an interesting PDF (yes I know its in Norwegian but can be translated). Stresses importance of RCDs in IT systems due to the lack of interconnected ground systems between buildings:


https://automasjonslab.files.wordpress.com/2018/11/jording.pdf

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