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solution for fast transients — Parallax Forums

solution for fast transients

ArchiverArchiver Posts: 46,084
edited 2002-10-03 18:13 in General Discussion
Hi folks!
I did a project here using pic16c63 to outdoor use, connected to low
voltage power lines. Very similar to watthour meter. I use a
transformless power supply.
Well....
I started some tests according IEC 61000 (fast transients) and,
amazing!, the registers values CHANGE with 2kV/4kV fast transients
apllied... I have a time counter and the output time changes showing
me that the time counter register varies. I have a LCD display and it
starts blinking during fast transients apllied.
Anyone has some advice to solve this?

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-09-30 21:43
    Ask the techs at Total Metering. These guys are very innovative, and design
    remote monitoring systems for power grids (1 phase, 3 phase), so no doubt
    have to deal with such things as 2kV/4kV fast transients.

    http://www.metering.co.nz/

    cheers,

    Ben.

    > From: "trader2mil" <trader2000@i...>
    > Reply-To: basicstamps@yahoogroups.com
    > Date: Mon, 30 Sep 2002 14:22:50 -0000
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] solution for fast transients
    >
    > Hi folks!
    > I did a project here using pic16c63 to outdoor use, connected to low
    > voltage power lines. Very similar to watthour meter. I use a
    > transformless power supply.
    > Well....
    > I started some tests according IEC 61000 (fast transients) and,
    > amazing!, the registers values CHANGE with 2kV/4kV fast transients
    > apllied... I have a time counter and the output time changes showing
    > me that the time counter register varies. I have a LCD display and it
    > starts blinking during fast transients apllied.
    > Anyone has some advice to solve this?
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and Body
    > of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2002-09-30 22:38
    I have done a number of power line powered projects recently , but have
    always used traditional transformer supplies plus optical isolation (which I
    know doesn't really apply in this case) and conventional snubbing. I have
    put together my own method of determining snubber component values that has
    recently saved a project that's connected to 480V lines. mail me off-list
    since it's not really on topic here - and please be patient while I am
    swamped with work. I am however glad to share this info.

    Chris

    >
    > I did a project here using pic16c63 to outdoor use, connected to low
    > voltage power lines. Very similar to watthour meter. I use a
    > transformless power supply.
    > Well....
    > I started some tests according IEC 61000 (fast transients) and,
    > amazing!, the registers values CHANGE with 2kV/4kV fast transients
    > apllied... I have a time counter and the output time changes showing
    > me that the time counter register varies. I have a LCD display and it
    > starts blinking during fast transients apllied.
    > Anyone has some advice to solve this?
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2002-10-01 19:16
    To what level are you testing to under IEC 61000. What coupling modes
    do you fail at. I suspect your power supply is coupling the noise to
    your micro. Are your digital lines sandwiched between power/gnd
    planes? I would add ferrite beads or T filters to all of your dc
    supplies on your board. You need to select a bead/T filter that is
    rated to handle the current. Murata and Stewart are 2 sources that
    come to mind. Do you have a power inlet filter to filter noise out at
    the source? Do you have problems with radiated suseptability and
    radiated emmissions?

    Jason


    --- In basicstamps@y..., "trader2mil" <trader2000@i...> wrote:
    > Hi folks!
    > I did a project here using pic16c63 to outdoor use, connected to
    low
    > voltage power lines. Very similar to watthour meter. I use a
    > transformless power supply.
    > Well....
    > I started some tests according IEC 61000 (fast transients) and,
    > amazing!, the registers values CHANGE with 2kV/4kV fast transients
    > apllied... I have a time counter and the output time changes
    showing
    > me that the time counter register varies. I have a LCD display and
    it
    > starts blinking during fast transients apllied.
    > Anyone has some advice to solve this?
  • ArchiverArchiver Posts: 46,084
    edited 2002-10-03 18:13
    I am testeing under the 4 levels, 500V, 1kV, 2kV and 4 kV. It is monophase
    and it is coupled phase, neutral, load and ground. All 4 coupling was fail
    with 2 and 4 kV.
    Yesterday , I used a line filter and passed the 2kV, all coupling methods,
    but not 4kV. Today I will use a Schaffner line filter (better).
    My circuit board is one face only. I do not use a transformer power supply.
    It is transformerless.
    denis
    Original Message
    From: "jbirnsch" <jbirnsch@v...>
    To: <basicstamps@yahoogroups.com>
    Sent: Tuesday, October 01, 2002 3:16 PM
    Subject: [noparse][[/noparse]basicstamps] Re: solution for fast transients


    > To what level are you testing to under IEC 61000. What coupling modes
    > do you fail at. I suspect your power supply is coupling the noise to
    > your micro. Are your digital lines sandwiched between power/gnd
    > planes? I would add ferrite beads or T filters to all of your dc
    > supplies on your board. You need to select a bead/T filter that is
    > rated to handle the current. Murata and Stewart are 2 sources that
    > come to mind. Do you have a power inlet filter to filter noise out at
    > the source? Do you have problems with radiated suseptability and
    > radiated emmissions?
    >
    > Jason
    >
    >
    > --- In basicstamps@y..., "trader2mil" <trader2000@i...> wrote:
    > > Hi folks!
    > > I did a project here using pic16c63 to outdoor use, connected to
    > low
    > > voltage power lines. Very similar to watthour meter. I use a
    > > transformless power supply.
    > > Well....
    > > I started some tests according IEC 61000 (fast transients) and,
    > > amazing!, the registers values CHANGE with 2kV/4kV fast transients
    > > apllied... I have a time counter and the output time changes
    > showing
    > > me that the time counter register varies. I have a LCD display and
    > it
    > > starts blinking during fast transients apllied.
    > > Anyone has some advice to solve this?
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
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