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    Tarak_Datta's Avatar
    Tarak_Datta Posts: 1, Reputation: 1
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    #1

    Mar 27, 2010, 03:29 AM
    sf6 current transformer
    In case of sf6 gas leakage in the current transformer below the safe limit value, what happen to the current transformer?
    Tarak
    Newton1Law's Avatar
    Newton1Law Posts: 60, Reputation: 5
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    #2

    Mar 30, 2010, 07:12 PM

    The SF-6 gas used in current transformers perform two functions. One is electrical insulation, the second is cooling. Loss of the SF-6 gas also means that the CT is open to the atmosphere and may be incurring moisture and air infiltration. Since most SF-6 gas insulated CTs are high voltage devices, 200 kV to 745 kV, going below the safe limits means the risk of a short circuit of the primary lead to ground. As mentioned above you may also experience CT failure do to loss of cooling. Hope this helps.
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #3

    Mar 31, 2010, 05:53 AM

    I thought they came with built in safety mechanisms. Some valve that if the pressure isn't maintained, or there is current leak then it shuts off.
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #4

    Mar 31, 2010, 06:09 AM

    Never mind, I read the question wrong. To add something more constructive... don't forget how SF6 is used as arc preventative, not only because of its insulating qualities but because of its reactivity. A leak without shut down could fry the whole unit.
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