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Topic Title: Distribution Control System - Voltage Colours
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Created On: 02 October 2007 11:53 AM
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 02 October 2007 11:53 AM
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JAD49

Posts: 3
Joined: 07 June 2007

I have often been told there is a standard for voltage colours for a distribution control diagram. I expect it may have been a CEGB standard but the nearest I've got to it, is a Relevant Electrical Standards NGrid document. This gives the following as colour scheme to distinguish busbar voltage (kV):-

400 blue
275 red
132 black
66 brown
33 green
25 yellow
22 yellow
11 red
6.6 blue
6.25 blue
3.3 violet

Does anyone know if a standard exists and where I can obtain a copy? I have spent a while searching the web etc.

Regards

John
 02 October 2007 04:17 PM
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intrinsic4225B

Posts: 1626
Joined: 30 September 2004

Your post rings some bells with me, but I will have to have a think about it.

Is this colour coding intended for use in transmission and distribution system mimic diagrams and the like, perchance?

Regards,

Ross Currie TMIET
 02 October 2007 04:32 PM
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intrinsic4225B

Posts: 1626
Joined: 30 September 2004

Knew I had seen something somewhere - it was just a case of remembering where I had seen it.

The following quote is from the Ministry of Defence JSP 375, Volume 3, Chapter 3 - SRP01:2005 - MoD Electricity Safety Rules & Procedures

"Mimic Diagram: A single line diagram of an electrical distribution system so made
that the symbol for each item of switchgear may be adjusted to indicate the ON, the
OFF, or the EARTHED position. The symbol for each item of Equipment shall use
the appropriate colour indication of voltages to BS 3939."


The British Standard referred to above - BS 3939-1:1986 Graphical Symbols for Electrical Power, Telecommunications and Electronics Diagrams is now to the best of my knowledge and belief an obsolete standard but this may be the source of your voltage colour coding system.

Regards,

Ross Currie TMIET
 02 October 2007 07:53 PM
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alancapon

Posts: 5842
Joined: 27 December 2005

John,

I think your list of colours is correct. You will find though that some companys have a few local variations, for example we use blue for 3.3kV instead of violet, we also have a non-standard 90kV which we use orange for. Finally, LV (415v) is usually brown on the list. It was certainly an ESI standard for control room wall-diagrams, and transferred to the electronic form for scada display mimics. I cannot recall if the colours were in the BS, or just the symbols.


Regards,

Alan.
 04 October 2007 01:13 PM
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searl

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Joined: 17 April 2002

Try IEC 60617 Graphical Symbols for Diagrams.
 05 October 2007 03:02 PM
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JAD49

Posts: 3
Joined: 07 June 2007

First thanks for the great response! I shall try get a look at BS 3939 & IEC 60617 from a library.

Regards

John
 23 January 2013 10:32 AM
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Felixt

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Joined: 23 January 2013

Anyone know the BS or IEC colour standard for 500kV voltage?
 25 January 2013 10:32 PM
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AncientMariner

Posts: 549
Joined: 14 December 2004

Hi Alan

Just out of interest, what voltages are used for distribution/supply in the IoM?

Thanks.

Clive

-------------------------
Clive S Carver GCGI IEng MIET
 26 January 2013 01:37 AM
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alancapon

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Originally posted by: AncientMariner
. . . Just out of interest, what voltages are used for distribution/supply in the IoM?

In terms of transmission, we use 90kV for our cable to the UK, and 33kV for the transmission network on the island. For distribution, this is mostly 11kV, with a bit of legacy 3.3kV too. We sell to customers at 400/230v or 11kV.

Regards,

Alan.
 26 January 2013 08:57 AM
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drhirst

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The cable to the UK is the longest subsea A/C cable in the world.

-------------------------
David Hirst
 26 January 2013 10:27 AM
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alancapon

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Joined: 27 December 2005

Originally posted by: drhirst
The cable to the UK is the longest subsea A/C cable in the world.

Correct. A record that it has held for over 12 years now.

Regards,

Alan.
 26 January 2013 04:18 PM
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AncientMariner

Posts: 549
Joined: 14 December 2004

Thanks for the info Alan.

90 kV seems an 'odd' voltage? I trust that it does not start off at 132 kV and experience a high volt-drop!

Cheers!

Clive

-------------------------
Clive S Carver GCGI IEng MIET
 27 January 2013 12:34 AM
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alancapon

Posts: 5842
Joined: 27 December 2005

No, we have a pair of 132/90kV transformers at the UK end. There are two reasons for this, firstly it makes for easier connection of reactors to absorb the reactive power from the cable when necessary (they are connected to transformer tertiaries, and secondly, the 90kV is a balance between cable losses and insulation costs.

The ac link has advantages for us, as being synchonously connected to the UK grid (which has considerably more inertia than our little system), we inherit the UK's system stability, making island blackouts a very rare event compared to a few years ago.

Regards,

Alan.
 27 January 2013 05:06 PM
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AncientMariner

Posts: 549
Joined: 14 December 2004

Thanks Alan for the info on the Isle of Man Interconnector.

I found a couple of interesting articles relating to this project:- http://www.gov.im/mea/projects/ and http://www.hvpd.co.uk/media/pd...DC-Paper-Mar-2006.pdf

I have also taken the opportunity to edit the Wikipedia article to correct DC Voltage to AC Voltage in the "Technical Information" section.

http://en.wikipedia.org/wiki/I...ngland_Interconnector

Cheers!

Clive

-------------------------
Clive S Carver GCGI IEng MIET
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