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Isolating transformer help

MrJack96
fbfff694442d96ab55a4ca1cf11d99ce-huge-2f44b3c6-e82b-49a0-b1bd-1df87196400c.jpg36db8eb65df624d194c4f0d38bc9d37e-huge-858d560a-6a7b-4127-9383-db090315f918.jpg5829e0bca8ccbe2f8ca57ff4780fc9b2-huge-19d0edbf-ea01-407a-9fc4-6ac2c9c6ba51.jpgHi guys I have seen an isolating transformer feeding a single phase pump on site and am unsure if it should be isolated. I can see they have tied the 0v on the 110v side to earth just not the 240v Can anyone give me some advice. Here are some pictures. 


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    MrJack96:

    The top one has 110v 0v that’s earthed and then 230-0v which has no continuity to earth 

    19796FB0-FB93-4150-9FF8-1A6FEBB63E9C.jpeg


    I am assuming that there are connections to the lower terminals, not very visible?  But there are some interesting voltage options available.

    looks like 220v 380v 420v 500v(?) and 550v  with a 20v label next to the Gn/Yl  I guess that allows for 240v 400v etc.  But 500v & 550v? I have never come across those. (In my time I've met some odd(?) voltages/frequencies even 112v DC for aircraft)

    Clive


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  • 0
    MrJack96:

    The top one has 110v 0v that’s earthed and then 230-0v which has no continuity to earth 

    19796FB0-FB93-4150-9FF8-1A6FEBB63E9C.jpeg


    I am assuming that there are connections to the lower terminals, not very visible?  But there are some interesting voltage options available.

    looks like 220v 380v 420v 500v(?) and 550v  with a 20v label next to the Gn/Yl  I guess that allows for 240v 400v etc.  But 500v & 550v? I have never come across those. (In my time I've met some odd(?) voltages/frequencies even 112v DC for aircraft)

    Clive


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