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Loss of mains for type tested generation units

Jam
Hi all,


I'm reviewing the Loss of Mains protection for a number of old (pre-2018) G59 type tested inverters. While for site commissioned units it is required to note the LOM detection method, the "G59 certificate" only records operation time. I haven't managed to find (yet) a statement that it must be a certain method; G59 only seems to say that the parameters must be XX for each method (depending on age) and leaves it open to the manufacturer to decide. Does anyone know where it states which method is used? I'm also trying manufacturers but not all of them still exist!


It's always been a niggle at the back of my mind, but it's not been an issue... Now with the ENA's requirement to update old settings it's relevant.


Ta,

Jam
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    AJJewsbury:

    . . . When comissioning on site however I would have thought it would be difficult simulate many of those conditions (you obviously can't mess with the real grid so you'd almost need your own little power plant with controllable frequency to simulate nasty grid conditions) . . . 




    Indeed, and this is the reason behind the certificated “type tested” inverters, whether they are certified to G.59, G.83, or the newer G.98 or G.99 standards. If however you modify one or more of the inverter parameters, the type-test certificate becomes invalid and my understanding is that the inverter can no longer be legally connected to the public supply without re-certification. 


    Suitable test kit can be purchased, and auto test routines aren’t too difficult to write if you are familiar with testing of power system protection devices. The test kit will probably set you back over £25,000 (I haven’t bought any for a while), plus you will need annual calibration for it, which doesn’t come cheap. You would probably also need to submit your results to the appropriate DNO on a site by site basis for approval, before the inverter is reconnected to the public supply. 


    Regards,


    Alan. 

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  • 0

    AJJewsbury:

    . . . When comissioning on site however I would have thought it would be difficult simulate many of those conditions (you obviously can't mess with the real grid so you'd almost need your own little power plant with controllable frequency to simulate nasty grid conditions) . . . 




    Indeed, and this is the reason behind the certificated “type tested” inverters, whether they are certified to G.59, G.83, or the newer G.98 or G.99 standards. If however you modify one or more of the inverter parameters, the type-test certificate becomes invalid and my understanding is that the inverter can no longer be legally connected to the public supply without re-certification. 


    Suitable test kit can be purchased, and auto test routines aren’t too difficult to write if you are familiar with testing of power system protection devices. The test kit will probably set you back over £25,000 (I haven’t bought any for a while), plus you will need annual calibration for it, which doesn’t come cheap. You would probably also need to submit your results to the appropriate DNO on a site by site basis for approval, before the inverter is reconnected to the public supply. 


    Regards,


    Alan. 

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