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Big Transformers

Big Transformers

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In Belmont,NH

20200112_154038.jpg 20200104_115250.jpg 20191226_135017.jpg 20191227_125250.jpg

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Filename:20191226_135017.jpg
Album name:CreeRSW207 / Utility Poles
Keywords:Miscellaneous
File Size:295 KB
Date added:Dec 28, 2019
Dimensions:1848 x 2464 pixels
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Date Time:2019:12:26 13:50:16
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streetlight98
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Dec 28, 2019 at 09:45 PM Author: streetlight98
I believe these are regulators to compensate for voltage drop.

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Dec 29, 2019 at 01:12 AM Author: Roi_hartmann
Seems something like that since these are wired in serie with the line and not between phases.

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Dec 29, 2019 at 08:22 AM Author:
High voltage primary transformers designed to either reduce or increase primary voltage on the load side of the transformer. Used when a line is being upgraded to a high voltage a section at a time. These show to be 500 KVA each.
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Dec 31, 2019 at 06:57 AM Author: CreeRSW207

High voltage primary transformers designed to either reduce or increase primary voltage on the load side of the transformer. Used when a line is being upgraded to a high voltage a section at a time. These show to be 500 KVA each.

I’ve also seen them bank these giant beasts on one pole.

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Jan 15, 2020 at 04:47 PM Author: Globe Collector
In star these still need to have a connection back to the star point...which I cannot see here. In Delta, they would need to access one of the other phases, which I can't see either??? There just seems ti be the "hot" end and the tap. I'm assumong they are autotransformers.

Here in Tasmania a single three-phase unit with three motorized tap arms deals with the I squared R drop.

Manufactured articles should be made to be used, not made to be sold!

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Jan 15, 2020 at 04:56 PM Author: monkeyface
Wow 500kVA is quite a lot for pole mounted transformers. Our ones are max. 250kVA Dyn5 type transformers on poles.




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Jan 15, 2020 at 06:40 PM Author:

Wow 500kVA is quite a lot for pole mounted transformers. Our ones are max. 250kVA Dyn5 type transformers on poles.

Strictly either to lower or raise the primary voltage, one transformer per phase. If you look a the primary wires between the two poles, you can see a polymer insulator separating each phase and a tap wire on the line side going to the transformer and a tap wire coming out of of another bushing and going to the load side of the line. They use these when they upgrade a substation or line voltage and raise the voltage over a period of time over sections of the lines.
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Jan 16, 2020 at 02:37 AM Author: Globe Collector
I can see the line and load connections, i.e. the "top" (line)of the winding and the "tap" (load), but where's the "bottom" of the winding connected?

Here's our three phase (delta) equivalent.

There are three coils, on three legs of one core, each coil is one side of the delta, the line connects to the wiper taps of the delta and the load connects to the corners (of the triangle) delta. The wiper taps only adjust over the top few percent of the total winding.

An voltage dip sensor activates a motor to move the taps to a higher setting to compensate for the I squared R drop under increased load. This one is 11Kv. (Single JD).

Manufactured articles should be made to be used, not made to be sold!

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Jan 16, 2020 at 07:55 AM Author:
Third top bushing is neutral/ground.
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Jan 17, 2020 at 12:11 AM Author: Globe Collector
Oh.yes I can see the third bushing if I Blow the picture right up...still not clear how they are connected though. Seems they are just all connected together to make a star point.

Interesting how the middle one is in a smaller can, but with more oil cooling radiators...I wonder is it the same rating as the outer two but just a more modern, ore efficient, smaller design, or it it actually a lower KVA rating?

You can just make out the KVA rating on the outer two, bit the middle one has a brass plate that is too far away to make out.

This Old 300KVA transformer has been replaced by a single pole mounted 500KVA one in a smaller box on the opposite side of the road....it will be visible next time the Google Car goes through there. Actually I saw an "Apple Maps" car near there recently so you might see the new transformer on Apple Maps!

Manufactured articles should be made to be used, not made to be sold!

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Jan 17, 2020 at 12:16 AM Author:
Probably just different manufacturers. If you look at the secondary span wire under the platform, you see the connections for the neutral/ground bushings.
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Jan 17, 2020 at 12:18 AM Author: Globe Collector
Yes, did notice some wires under there and wondered if that was it.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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