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Transformers
Former Community Member
When you get these industrial diverse power supplies with 400v,230v and 110v sockets on them and there is say a 4kV transformer inside them how are the cables coming out from the transformer connected has to get 230v are the cables connected to the L1 and L3 connections of the transformer in order to get 230v and L3 and Neutral connections of the output of the transformer in order to get 110v and then I assume these cables from the transformer are connected to say a 32A MCB in order to connect to the respective sockets. What is the configuration within the transformer to produce 400v considering that there are 5 power cables each for the L1,L2,L3,N & E that are inputted into the transformer.Quite new to transformers so was after some examples and ideas of the workings of them and what they create in respect of the different line voltages?.Jimmy2Rivers
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All i'm after is a basic understanding has to how you connect up from the output side of the transformer to get the respective voltages of 110,230 and 400v then I guess these are connected via trip circuits for safety applications to the sockets then you can plug into these respective sockets for either 230/110/400v depending on your requirements. So a diagram with the respective safety breakers as to how it is connected not too bother about going into the legalisation of it all. Its just for basic understanding for classes.
In the UK, the 11kV or 33kV lines are normally 3 phase, no neutral, no earth. So the overhead lines snaking across the landscape on wooden poles have 3 wires. The earth is supplied locally, and the transformer primaries are delta wound so they don't need a neutral.
The secondary is normally star wound, 3 phase plus neutral, giving 400V phase-to-phase and 230V phase-to-neutral. If 110V is needed, it's normally a separate transformer hooked up to a 230V line. But I have only ever heard about 110V supplies being used in the UK for supplying power on building sites, or for testing 110V appliances that are going to be shipped overseas. Or maybe special converters for 115V 400Hz, for testing aircraft systems.
Well this will be 2 transformers 4kva in a Power Cabinet and the output will be 110v,230v and 400v with the 5 cables going into the cabinet. So not sure how they will be connected if there's no earth and neutral.
Do you have an email address I can send you a design of the Power Cubicle cause that is what it is.It's a power source which has 3 different sockets for the various voltages,and inside there are two transformers and there are a set of MCB's above the transformers I assume for safety applications.
So say between Ground Floor and 1st Floor there are two power sources cabinets with 2 transformers in each cabinet 1 on one side of the room and the other at the far end of the room there are 3 floors each floor having 2 cabinets. Now each cabinets has sockets for 110v,230v and 400v with 5 35mm2 cables to cater for 4 Welding bits of equipment working at any one time. On the office area there are 6 13A Double sockets on one side of the office and 6 on the other side.Now I just want to get power to these sockets and also to get power to the lights. Of which these are ideas whether to have one switch to switch them all on at once or to have a switch on each different floor?.Jimmy
