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 31, 2019 at 06:57 AM Author: CreeRSW207
Quote from GE101R on Dec 29, 2019 at 08:22 AM 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.

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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 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!

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

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!