ve.bus:grid-codes-and-loss-of-mains-detection
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ve.bus:grid-codes-and-loss-of-mains-detection [2019-01-21 11:12] – [DISQUS] ictbeheer | ve.bus:grid-codes-and-loss-of-mains-detection [2020-07-20 16:48] – [LOM detection Type A and Type B] mvader | ||
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==== How does LOM detection relate to overload shutdowns? ==== | ==== How does LOM detection relate to overload shutdowns? ==== | ||
- | To detect a loss of mains, the inverter/ | + | To detect a loss of mains, the inverter/ |
When connected to a generator, or to a grid with a long extension cable or long ‘last mile’ cable, the pushing and pulling on the grid does create high currents, and as a result the inverter/ | When connected to a generator, or to a grid with a long extension cable or long ‘last mile’ cable, the pushing and pulling on the grid does create high currents, and as a result the inverter/ | ||
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+ | ==== How does LOM detection relate to passthru? ==== | ||
+ | |||
+ | Similar to above section about overload, a too weak connection to the utility can cause continuous increases and decreases in frequency, not resulting in overload but still resulting in continuous shifts in frequency. | ||
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+ | This (can) cause a safety mechanism to activate which temporarily disables feed-in. | ||
+ | ==== How to identify if LOM detection causes issues? ==== | ||
+ | |||
+ | By temporarily disabling the LOM, one can identify that the LOM is causing an issue. Here is how to disable it: | ||
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+ | Open VEConfigure, | ||
+ | |||
+ | Save the settings, and wait to see if this helps. In case it does help, see next section. | ||
+ | |||
+ | NOTE: for LOM to cause issues is really rare. Its documented in detail on this page to help installations where it does cause an issue, but its really rather rare to happen in the first place. Do make sure to read the [[ess: | ||
+ | ==== What to do when LOM detection causes issues? ==== | ||
+ | |||
+ | The previous section explains how to identify if LOM causes an issue. It can cause overload shutdowns, and it can also cause a system to frequently show " | ||
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+ | The solution is then to make for a better connection to the utility - but as that is often quite hard to achieve, here is another solution: keep LOM disabled and install an external anti-islanding safety devices (ENS). For example from Ziehl, or another brand. Make sure to comply to local rules & regulations - this is a real critical safety issue. | ||
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==== LOM detection Type A and Type B ==== | ==== LOM detection Type A and Type B ==== | ||
- | LOM detection | + | |
+ | Within the Victron product range, there are two types of LOM detection | ||
+ | |||
+ | All recent certified grid codes use Type B. On the MultiPlus-II models, **all** grid codes use Type B, and Type B is no longer used. | ||
**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 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. | ||
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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