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ve.bus:grid-codes-and-loss-of-mains-detection

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ve.bus:grid-codes-and-loss-of-mains-detection [2017-12-08 13:34] – L.O.M. -> LOM mvaderve.bus:grid-codes-and-loss-of-mains-detection [2019-01-21 11:12] – [DISQUS] ictbeheer
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 The purpose of LOM is to detect that the Multi is no longer connected to the mains. Be that a generator or the grid. In such case, the Multi needs to open its back-feed relay. Not doing that would be unsafe. Imagine an electrician working on the street, and disconnecting a house. He then needs to be able to safely work on the wiring from the house. The purpose of LOM is to detect that the Multi is no longer connected to the mains. Be that a generator or the grid. In such case, the Multi needs to open its back-feed relay. Not doing that would be unsafe. Imagine an electrician working on the street, and disconnecting a house. He then needs to be able to safely work on the wiring from the house.
  
-==== How does LO.M. detection relate to overload shutdowns? ====+==== How does LOM detection relate to overload shutdowns? ====
  
 To detect a loss of mains, the inverter/charger will constantly try to shift the AC frequency. When connected to a stable grid, with a normal accepted impedance, it will not be possible to do so, and it can therefor detect that the mains is still present. In case the mains was lost, the inverter/charger will be able to shift the frequency at will, without any resulting correction currents. To detect a loss of mains, the inverter/charger will constantly try to shift the AC frequency. When connected to a stable grid, with a normal accepted impedance, it will not be possible to do so, and it can therefor detect that the mains is still present. In case the mains was lost, the inverter/charger will be able to shift the frequency at will, without any resulting correction currents.
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 LOM detection comes in two flavours: **Type A** and **Type B**. LOM detection comes in two flavours: **Type A** and **Type B**.
  
-**Type A** is the strongest form LOM detection, which results in the quickest detection time. It requires a low impedance connection to the grid (short, well sized cables). LOM **Type A** will not work with generators.+**Type A** is the strongest form of LOM detection resulting in the quickest detection time. It requires a low impedance connection to the grid (short, well sized cables). LOM **Type A** will not work with generators.
  
-**Type B** has a more soft approach. Resulting in a slightly longer detection time. Still acceptable in several countries (South-Africa, and probably, though not tested and certified yet, also Germany). On generators, and also connection with a relatively high impedance mains connection, **Type B** will work better than **Type A**.+**Type B** has a more soft approach and a slightly longer detection time. **Type B** has been type tested and approved for most Multi/gridcode combinations. //(The only combination not tested so-far is MultiPlus/Quattro i.c.w. UK grid code. However this combination is most likely valid. It has just not been type tested yet.)//\\ 
 +On generators, and also with installations having a relatively high impedance mains connection, **Type B** will work better than **Type A**.
  
 For generators on which also **Type B** does not work, see Disabling LOM. For generators on which also **Type B** does not work, see Disabling LOM.
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 Some, bigger or better quality generators, will be able to work with LOM **Type B**. For other less stable generators it will be required to disable LOM entirely. In that case make the installation such that it is still safe: no simple extensions cords, use enclosed wiring cabinets with warnings on the outside and/or an external ENS. Some, bigger or better quality generators, will be able to work with LOM **Type B**. For other less stable generators it will be required to disable LOM entirely. In that case make the installation such that it is still safe: no simple extensions cords, use enclosed wiring cabinets with warnings on the outside and/or an external ENS.
  
 +More information here: https://www.victronenergy.com/live/multiplus_faq
 ==== Q4: I use ESS, but have disabled feed-back, is a grid-code still required? ==== ==== Q4: I use ESS, but have disabled feed-back, is a grid-code still required? ====
  
 A: Yes, also in this case LOM is required to make for a safe and also local regulations compliant system. Running ESS with disabled-feed-back is still not the same as using a Multi in its default configuration without ESS.  A: Yes, also in this case LOM is required to make for a safe and also local regulations compliant system. Running ESS with disabled-feed-back is still not the same as using a Multi in its default configuration without ESS. 
  
-===== DISQUS ===== +
-~~DISQUS~~+
ve.bus/grid-codes-and-loss-of-mains-detection.txt · Last modified: 2022-10-31 23:41 by mvader
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