ve.bus:grid-codes-and-loss-of-mains-detection
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
ve.bus:grid-codes-and-loss-of-mains-detection [2020-07-21 14:52] – [2.5 How to identify if LOM detection causes issues?] mvader | ve.bus:grid-codes-and-loss-of-mains-detection [2022-10-31 23:41] (current) – [2.8 Grid codes and Type A and Type B LOM] mvader | ||
---|---|---|---|
Line 15: | Line 15: | ||
==== 2.1 What is LOM detection? ==== | ==== 2.1 What is LOM detection? ==== | ||
- | LOM is an automatic process that detects a change and so loss of the mains/ | + | LOM is an automatic process that detects a loss of the mains/ |
==== 2.2 Why is LOM detection required? ==== | ==== 2.2 Why is LOM detection required? ==== | ||
Line 25: | Line 25: | ||
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, |
==== 2.4 How does LOM detection relate to passthru? ==== | ==== 2.4 How does LOM detection relate to passthru? ==== | ||
Line 33: | Line 33: | ||
This (can) cause a safety mechanism to activate which temporarily disables feed-in. | This (can) cause a safety mechanism to activate which temporarily disables feed-in. | ||
- | ==== 2.5 How to identify if LOM detection causes issues? ==== | + | ==== 2.5 How to identify if LOM detection causes |
- | By temporarily disabling the LOM, one can identify that the LOM is causing | + | By temporarily disabling the LOM, one can identify that the LOM is causing |
Open VEConfigure, | Open VEConfigure, | ||
Line 41: | Line 41: | ||
Save the settings, and wait to see if this helps. | Save the settings, and wait to see if this helps. | ||
- | In case disabling LOM solves the issue, one solution is to make for a better (lower impedance) connection to the utility. In case that can't be improved, another solution is to keep LOM disabled and install an external anti-islanding safety devices (ENS). For example from Ziehl, or another brand. They have different techniques of detecting a loss of mains, and can (often) therefor work without any problem. Detailed instructions for permanently disabling the built-in LOM feature are in the next chapter. | + | In case disabling LOM solves the overload |
- | 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: | + | NOTE: for LOM to cause overload |
==== 2.6 Disabling LOM ==== | ==== 2.6 Disabling LOM ==== | ||
Line 53: | Line 53: | ||
To disable LOM, use VEConfigure and go to the Grid tab. A password is required to choose " | To disable LOM, use VEConfigure and go to the Grid tab. A password is required to choose " | ||
+ | |||
+ | KNOWN LIMITATION: Note that, even with the LOM detection disabled on an AC input, the inverter/ | ||
=== Safety notes - Generator === | === Safety notes - Generator === | ||
Line 76: | Line 78: | ||
**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. | ||
- | **Type B** has a more soft approach and a slightly longer detection time. Type B has been type tested and approved for most Multi/ | + | **Type B** has a more soft approach and a slightly longer detection time. Type B has been type tested and approved for most Multi/ |
+ | |||
+ | The default value in VEConfigure is the approved value. When Type B is approved, Type A will not be shown in VEConfigure as an option, because there is no reason to prefer Type A over Type B in that case. | ||
+ | |||
+ | BE AWARE: Whether a Multi/Quattro is approved for a certain country CANNOT be concluded from the fact that VEConfigure shows the option. Check the safety certificates on our website to see the allowed models for your country. | ||
On generators, and also with installations having a relatively high impedance mains connection, Type B will work better than Type A. | 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 the Disabling LOM section above, as well as the there noted limitation. |
==== 2.8 Grid codes and Type A and Type B LOM ==== | ==== 2.8 Grid codes and Type A and Type B LOM ==== | ||
- | Some Grid codes will use Type A and others will use Type B. The Type that has been tested and approved for compliancy is marked with __grid code compliant__. See below screenshot. | + | At the time of writing all Grid codes use Type B or "LOM disabled" |
+ | |||
+ | The Type that has been tested and approved for compliancy is marked with __grid code compliant__. See below screenshot. | ||
* Grid codes using Type A: VEConfigure lets you override that to Type B and/or disabling LOM. | * Grid codes using Type A: VEConfigure lets you override that to Type B and/or disabling LOM. | ||
* Grid codes using Type B: VEConfigure lets the installer override it to disabling LOM only. | * Grid codes using Type B: VEConfigure lets the installer override it to disabling LOM only. | ||
+ | * Grid codes using " | ||
{{ : | {{ : | ||
Line 117: | Line 127: | ||
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. | ||
+ | |||
+ | Note that it is also possible for some generators that it is not accepted by the inverter/ | ||
More information about Victron Inverter/ | More information about Victron Inverter/ | ||
+ | |||
==== 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? ==== | ||
ve.bus/grid-codes-and-loss-of-mains-detection.1595335976.txt.gz · Last modified: 2020-07-21 14:52 by mvader