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Type-A RCD failing 180 degree ramp test

Former Community Member
Former Community Member
Hi


We are testing a type-A RCD (see image: "ABB") with a METREL MI 3152 (see image: "MI 3152 test").

As the image shows, the ramp test (I delta) is failing to trip the RCD for the negative half wave.


Have oneone seen this before?


Br Sebastian
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    looking at  the manual  for the Autotest, pages 108-111 of the PDF, it does a hard trip at 1 times,  plus and minus 5 times and fineshes with two ramp tests (+/-). You have to reset the RCD at each step and as it steps through the tests it fills out that  table of results.

    I see in the notes that if you call up type A it uses a pulsed waveform, and if yo call up AC it uses sine waves, and then either upto 1.5 times the nominal rating or 2.2 times for lower rated.


    It would be interesting to know if it passes the tests for an AC type  device on both polarities.
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  • 0
    looking at  the manual  for the Autotest, pages 108-111 of the PDF, it does a hard trip at 1 times,  plus and minus 5 times and fineshes with two ramp tests (+/-). You have to reset the RCD at each step and as it steps through the tests it fills out that  table of results.

    I see in the notes that if you call up type A it uses a pulsed waveform, and if yo call up AC it uses sine waves, and then either upto 1.5 times the nominal rating or 2.2 times for lower rated.


    It would be interesting to know if it passes the tests for an AC type  device on both polarities.
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