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  1. soare0

    Replacing SF6 with R134a?

    Well, at startup, I didn't suppose that building a transformer could be a thrilling activity. ScottyUK: -Yes, indeed, there are environmentall problems with SF6, but if I remember correctly, not with the ozone but with warming potential. However, it is bad anyway. And this is the reason for...
  2. soare0

    Solar cells and li-poly batteries

    Why they may become dangerous? I'm thinking at, let say, a 500mAh accu. However, if I would like to recharge my cell phone batery for example,the charger already exist, but I assume that this is not about a mobile phone batery.
  3. soare0

    Replacing SF6 with R134a?

    1. Well, there could be some reasons for somebody building a SF6 transformer, even at 2kVA: - copper wire. The minimum order for enameled wire - transformer oil resistant grade - was too expensive and, of course, not on stock. - weight. Well, it is a real pain to have a 1000 kg toy to work with...
  4. soare0

    Replacing SF6 with R134a?

    Thank you! First: I didn't knew that R134a is combustible. All the MSDS sheets I've read didn't say this. Oh, only that it can explode when it is mixed with air. Funny indeed! Second: the transformer is a prototype, build by me. So what to say about the manufacturer opinions... It is a small...
  5. soare0

    Replacing SF6 with R134a?

    Well, all I need is to fill an HV transformer (50kVrms) enclosure with SF6. Simple, ok. Only that all the stuff is needed in a week and the SF6 provider has some problems. So I must replace SF6 with something else. R12 freon is a good insulator and it can be used instead SF6 in certain...

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