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Why is this setup used? #128702
10/17/03 01:18 PM
10/17/03 01:18 PM
C-H  Offline OP
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
This question had me thinking real hard before I figured out the answer. Let's see if someone else can figure it out.

What are 132 kV single phase lines used for? These are found in Europe, sometimes next to ordinary 3-phase HV lines, like 230 kV.

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Re: Why is this setup used? #128703
10/17/03 03:29 PM
10/17/03 03:29 PM
james S  Offline
Joined: May 2003
Posts: 107
West England
Could it possibly be train supply lines (THIS IS ONLY A GUESS) [Linked Image]

[This message has been edited by james S (edited 10-17-2003).]

Re: Why is this setup used? #128704
10/17/03 07:18 PM
10/17/03 07:18 PM
Pinemarten  Offline
Joined: Aug 2003
Posts: 123
Edmonton, AB, Canada
Is this a trick question?
I would assume they are used for conducting electricity, otherwise why build them?

Re: Why is this setup used? #128705
10/18/03 03:49 PM
10/18/03 03:49 PM
:andy:  Offline
Joined: Oct 2003
Posts: 289
As far as I know the Train thing is right. It's transformed down to 15 kV for Railways, frequency of 16 2/3 Hz.

Re: Why is this setup used? #128706
10/19/03 08:14 AM
10/19/03 08:14 AM
pauluk  Offline
Joined: Aug 2001
Posts: 7,520
Norfolk, England
From :

The 15 kV a.c., 16 2/3 Hz, overhead system is used widely in Germany, Denmark and Austria. It is not used in the UK.

In Germany the 16 2/3 Hz electricity supply comes from railway generating stations. Power is transmitted at 110 kV via overhead lines. The power is transformed from 110 kV to 15 kV at railway substations that feed the railway overhead system.

Re: Why is this setup used? #128707
10/19/03 09:46 AM
10/19/03 09:46 AM
C-H  Offline OP
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden

that was a quick answer. It is indeed the transmission for the train lines. Andy and Paul are right about the reason - the frequency is different from that of the ordinary power grid.

Paul UK,

I think your source is wrong. Denmark uses 50Hz, 25kV for the trains whereas Sweden and Norway use 16 2/3Hz, 15kV. This has forced trains that run between the countries to be dual voltage / dual frequency.

[This message has been edited by C-H (edited 10-19-2003).]


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