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Meadow #215912 08/14/15 09:40 AM
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Meadow Offline OP
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Thank you DSK, awesome pic! smile

Meadow #216048 09/18/15 04:24 AM
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dsk Offline
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They told me, it is safer with the transformers at the ground, than in poles. I'm not so sure!
Picture taken from the bus to my job this morning.

Attached Images
2015-09-18 07.34.20.jpg
Meadow #216054 09/19/15 08:33 PM
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Meadow Offline OP
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Yikes, thats not very good. I agree, pole is better.

Meadow #217289 06/13/16 03:37 PM
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dsk Offline
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Maybe not always.
The lightning has hit and the grounding wire is off! As long as I stay on the ground this should be safe. or ??

I post this, and sends link to the owner of the network, and asks for comments and followups on this page.

As far as I know this supply is 3 phase delta 22kV with no fixed grounding of the transformer winding. I hope we may get some response here. thanks

Attached Images
pole.jpg
Last edited by dsk; 06/13/16 03:44 PM. Reason: adding text
Meadow #217411 07/21/16 11:04 PM
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Meadow Offline OP
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Awesome thanks! smile By chance, would you happen to know how the 22kv system is earthed at the substation?

Last edited by Meadow; 07/21/16 11:05 PM.
Meadow #217416 07/22/16 07:02 PM
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dsk Offline
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Normally not.

Meadow #217417 07/23/16 04:36 AM
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dsk Offline
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By the way, last time I visited USA, I registered high voltage with 3+N and only 3 wires (connected to the transformers to the consumers network), eg in different parts of CA. What will be the difference, and normal voltages? (Reference to other threads or pages? since this not fits this thread?)

dsk

dsk #217440 08/06/16 02:22 AM
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Originally Posted by dsk
By the way, last time I visited USA, I registered high voltage with 3+N and only 3 wires (connected to the transformers to the consumers network), eg in different parts of CA. What will be the difference, and normal voltages? (Reference to other threads or pages? since this not fits this thread?)

dsk


What are you referring to as "high voltage"?

For voltages in CA, the largest utility is PG&E, & here is a link to the "Greenboook" which lists the voltages they supply.

http://www.pge.com/includes/docs/pd...greenbook/greenbook_manual.pdf#Section_2

Meadow #217444 08/06/16 06:04 AM
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dsk Offline
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Huge document, I will need some time to read all that. :-)

This picture http://tinyurl.com/hs7q4wy shows a pole, sometimes the supply has 3 wires, and service neutral, sometimes only the 3 wires. The transformer primary is connected between N and one supply wire, or 2 of the supply wires. What use to be the primary voltage for these transformers?

dsk

Meadow #217645 09/29/16 09:36 AM
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Meadow Offline OP
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In California 16kv is very common followed by 12kv, the lines are usually 3 wire on the HV and have no neutral. Transformers are connected L-L or delta. There are some 4 wire lines where the HV neutral is insulated, and those are typically 2.4/4.16kvY.



Outside of California 4 wire is common for the HV with the neutral multi grounded (multi grounded mostly forbidden in California). Typical voltages are 7.2/12.47Y, 7.6/13.2Y, 7.9/13.8kvY, 13.2/23kvY, 14.4/25kvY and 19.9/34.5kvY. 2.4/4.16Y and 4.8/8.36kvY often found on older systems which are now obsolete.

Last edited by Meadow; 09/29/16 09:39 AM.
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