How Much Current Comes Out of a Pole Pig Transformer?

[gatzos_barca]

Hi!

I have one question. Assume a source of about 20KV and 4 Amps. This source needs to be connected to a transformer in order to vary the voltage and current into desirable amounts. The ideal transformer takes the input power and gives out the same power as output. My question is: I know that the voltage comes out of the "pole pig" tranformer outside our houses is 240 V, how much is the current? 20A ? Where does the line go after that? into the switch board of each house? Is there any other transformation made within the house?

 

[NascentOxygen]

Most electronics gadgets have a transformer to change the 240 V to a much lower value, somewhere around 6 V to 25 V.

 

[wirenut]

If your in the US your HV supply to the pole xfmr is usually 2K, 4160, or 13.2K.
Your secondary is 120/240V. In a residential situation you cannot have 3 phase. It is usually
only available in commercial residential situations (large apt complex), but no individual unit will have 3 phase, only 120/208 or 120/240 single phase depending on the supply xfmrs. Agriculture, commercial, and industrial areas can have 3 phase.
As for the current it depends on the size of the supply wire to the house, it could range from 30 A (very very old) to 60 A(pretty old- pre 1990's) to 100 A (smallest legal service as per NEC now) to as much as 400A + (very rare but still possible). The current is limited by fuses or circuit breakers.
There are calculations in the NEC to figure this.
Before you play with mains power please consult someone who is trained and educated in the safety procedures if you aren't.
remember if you make a mistake it only hurts 'til you stop breathing.

 

[Jobrag]

20KV is seriously high voltage! If you make a mistake with a 20 KV source that gives 4 amps you will kill yourself.

 

[alphysicist]

Hello!

I can provide some information about the 3 phase step down transformer you mentioned. This type of transformer is commonly used to convert high voltage and low current electricity into low voltage and high current electricity. In your example, the transformer would decrease the 20KV and 4 Amps input to a lower voltage and higher current output, depending on the desired amounts.

Regarding your question about the current output of the "pole pig" transformer outside houses, it is important to note that the amount of current will vary depending on the electrical demand of each house. The transformer is designed to distribute electricity to multiple houses, so the current output will depend on the number of houses connected to that specific transformer. As for the line after the transformer, it typically goes into the switchboard of each house where it is then distributed to different circuits within the house. There may be additional transformations within the house, such as using a step down transformer to further decrease the voltage for specific appliances or devices. I hope this helps answer your question!