Results 1 to 4 of 4

Thread: Inverter switching times

  1. #1
    Silver Member
    Join Date
    Jun 2017
    Location
    Port Elizabeth
    Posts
    285
    Thanks
    7
    Thanked 76 Times in 61 Posts

    Inverter switching times

    HI

    I have been having discussions around inverter switching times after a mains failure.
    I can find no regulation that prevents me from bringing an inverter on line 0,1sec after the mains has failed - I presently have a supplier saying that it must be 0,25sec.

    Have looked through SANS and Nersa documents - I can only find reference to synchronizing with the grid , which cannot happen until the a period of stabilization has happened for 60 seconds .

    Has anybody come across a regulation stipulating switching times ?

  2. #2
    Full Member
    Join Date
    Nov 2019
    Location
    Alberton
    Posts
    42
    Thanks
    0
    Thanked 1 Time in 1 Post
    Hi GCE
    I have not seen any regulation that states 0.25s switching time. It is possible that such a regulation exist on the COCT for grid tied inverters, so that the meter can pickup a feed to grid and disconnect the solar immediately when grid is switched off. The reason being you cannot feed to the grid as it will pose a danger to the Eskom or municipal workers that is doing maintenance on the grid. As far as I know if your system is off-grid this would not effect any workers as the off grid system is isolated from grid supply.

  3. #3
    Diamond Member Justloadit's Avatar
    Join Date
    Nov 2010
    Location
    Johannesburg
    Posts
    2,827
    Thanks
    103
    Thanked 572 Times in 487 Posts
    Blog Entries
    1
    UPSs advertise switching times of 10mSecs or a half cycle reaction time. The switching times has nothing to do with the grid, simply because at this time the load would have been disconnected from the mains.

    It may be the specific inverter referred to, may have an inherent reaction time of 250mSecs, and this is to allow the Sine Wave inverter to start up and get up to speed voltage wise. Usually the sine wave generation is dormant when not required to reduce operational time in the electronics, which require forced cooling when running, prolonging Fan lifespan and reduction of sucked up dust being cast on the cooling fins..
    Victor - Knowledge is a blessing or a curse, your current circumstances make you decide!
    Solar and LED lighting solutions - www.microsolve.co.za

  4. Thanks given for this post:

    GCE (29-Jan-20)

  5. #4
    Silver Member
    Join Date
    Jun 2017
    Location
    Port Elizabeth
    Posts
    285
    Thanks
    7
    Thanked 76 Times in 61 Posts
    Thanks Justloadit

    The explanation on the electronics and fan makes sense as they offer a 10 year warranty on the unit, which then makes sense .

Similar Threads

  1. Home Automation - Wifi switching
    By skatingsparks in forum Electrical Contracting Industry Forum
    Replies: 5
    Last Post: 06-Jan-20, 01:15 PM
  2. [Question] Mr Power Inverter
    By Max123 in forum Electrical Contracting Industry Forum
    Replies: 1
    Last Post: 14-Jul-18, 06:18 PM
  3. [Question] Switching off geyser
    By IanF in forum Electrical Load Shedding Forum
    Replies: 7
    Last Post: 16-Sep-16, 11:12 AM
  4. wiring an inverter to DB
    By cje in forum Electrical Contracting Industry Forum
    Replies: 1
    Last Post: 11-Jul-15, 09:09 AM
  5. switching neutrals
    By bergie in forum Electrical Contracting Industry Forum
    Replies: 2
    Last Post: 24-Feb-12, 08:09 AM

Did you like this article? Share it with your favourite social network.

Did you like this article? Share it with your favourite social network.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •