ve.bus:grid-codes-and-loss-of-mains-detection
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ve_bus:grid-codes-and-loss-of-mains-detection [2017-11-28 13:55] – 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 | ||
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- | ====== | + | ====== VEConfigure: |
- | ==== 1. Grid codes and complying to local regulations ==== | + | This document applies to VE.Bus firmware 419 and later. |
- | All countries have their own legislation and therewith their own requirements with regards of speed of Loss of mains detection, under & over voltages, accepted ramp times, and so forth. To make an installation comply to local regulations, | + | |
- | The exact requirements differ widely between the countries. For example the normal Multis, Quattros | + | ===== 1. Grid codes and complying to local regulations ===== |
+ | All countries have their own legislation and therewith their own requirements with regards to the speed of Loss of mains detection, under & over voltages, accepted ramp times, and so forth. To make an installation comply to local regulations, | ||
- | ==== 2. Loss of mains detection | + | The exact requirements differ widely between the countries. For example the normal Multis, Quattros and MultiCompacts are certified for use in the UK. For other countries, Germany for example, only the MultiPlus-II is certified to be installed without requiring additional external anti-islanding safety devices |
- | === What is L.O.M. detection? === | + | In certain situations, the inverter/ |
- | L.O.M. is an automatic process that detects a change and so loss of the mains/ | + | Make sure to also read [[ess: |
+ | ===== 2. Loss of mains detection (LOM) ===== | ||
- | === Why is L.O.M. | + | ==== 2.1 What is LOM detection? |
- | The purpose of L.O.M is to detect | + | LOM is an automatic process |
- | === How does LO.M. detection | + | ==== 2.2 Why is LOM detection |
- | To detect a loss of mains, the inverter/ | + | The purpose |
- | When connected | + | ==== 2.3 How does LOM detection relate |
+ | To detect a loss of mains, the inverter/ | ||
- | ==== 3. Configuration | + | When connected to a generator, or to a grid with a long extension cable or long ‘last mile’ cable, the impedance of the grid becomes much higher and the pushing and pulling on the grid will have a certain affect on the grid voltage. As a result the inverter/ |
- | [add a screenshot here] | + | ==== 2.4 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. | ||
- | ==== Questions ==== | + | This (can) cause a safety mechanism to activate which temporarily disables feed-in. |
- | === Q: Can I use ESS in a vehicle or a boat? === | + | ==== 2.5 How to identify if LOM detection causes overload issues? ==== |
+ | |||
+ | By temporarily disabling the LOM, one can identify that the LOM is causing overload issues. Here is how to disable it: | ||
+ | |||
+ | Open VEConfigure, | ||
+ | |||
+ | Save the settings, and wait to see if this helps. | ||
+ | |||
+ | In case disabling LOM solves the overload 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. | ||
+ | |||
+ | NOTE: for LOM to cause overload 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: | ||
+ | |||
+ | ==== 2.6 Disabling LOM ==== | ||
+ | |||
+ | There are a few situations in which LOM needs to be disabled: | ||
+ | |||
+ | - For certain generators | ||
+ | - In case LOM causes Overload, Passthru or other issues while connected to the utility (see above) | ||
+ | |||
+ | 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 === | ||
+ | |||
+ | There is no regulatory need to install external anti-islanding equipment when disabling LOM in combination with a generator. To make sure. by installing signs and other means, that it is very clear to any installer working on the generator that he must also switch off, or otherwise disconnect, the inverter/ | ||
+ | |||
+ | === Safety notes - Utility connection === | ||
+ | |||
+ | Disabling the LOM on an input connected to the grid is only allowed when other external safety equipment is installed, by means of an anti-islanding safety device. Victron does not make such producs. A common brand is Ziehl. | ||
+ | |||
+ | Make sure to comply to local rules & regulations - this is a critical safety issue. | ||
+ | |||
+ | === Screenshot of LOM settings === | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | ==== 2.7 Background: LOM detection Type A and Type B ==== | ||
+ | |||
+ | Within the Victron product range, there are two types of LOM detection available: Type A and Type B. | ||
+ | |||
+ | All recent certified grid codes use Type B. On the MultiPlus-II models, **all** grid codes use Type B, and Type A 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 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/ | ||
+ | |||
+ | 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 the Disabling LOM section above, as well as the there noted limitation. | ||
+ | |||
+ | ==== 2.8 Grid codes and Type A and Type B LOM ==== | ||
+ | |||
+ | 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 B: VEConfigure lets the installer override it to disabling LOM only. | ||
+ | * Grid codes using " | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | ===== 3. Example configuration in VEConfigure ===== | ||
+ | |||
+ | * A generator that requires LOM to be disabled. | ||
+ | * Generator on AC in 1, and grid on AC in 2, as recommended. | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | |||
+ | |||
+ | |||
+ | ===== 4. Questions ===== | ||
+ | |||
+ | ==== Q1: Where can I get the password? ==== | ||
+ | |||
+ | A: From your dealer. | ||
+ | |||
+ | ==== Q2: Can I use ESS in a vehicle or a boat? ==== | ||
A: No you cannot. After unplugging the shore cord it can take up to a few seconds for the system to detect the loss of mains and open the back-feed relay. During those seconds, the shore power plug will be `live`: there is 230 Volts AC on the terminals. The exact number of seconds differs per country and depends on the local requirements. | A: No you cannot. After unplugging the shore cord it can take up to a few seconds for the system to detect the loss of mains and open the back-feed relay. During those seconds, the shore power plug will be `live`: there is 230 Volts AC on the terminals. The exact number of seconds differs per country and depends on the local requirements. | ||
Line 36: | Line 122: | ||
The same applies to other solution where the wiring is not protected against accidental removing, for example a simple cable with end-user removable plug, such as a portable power supply. | The same applies to other solution where the wiring is not protected against accidental removing, for example a simple cable with end-user removable plug, such as a portable power supply. | ||
- | Q: Can I use ESS with a generator? | + | ==== Q3: Can I use ESS with a generator? |
+ | |||
+ | A: Yes you can. Note that the only installation type where that makes sense is a land based installation (no boat, and no vehicle). A Quattro must be used with AC input 1 connected to the generator, and AC input 2 connected to the grid. The role of the generator will be to provide power during a long grid failure. | ||
+ | |||
+ | 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/ | ||
- | A: Yes you can. For some generators it will even be possible to set the grid code to ‘Weak LoM’. 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. | + | ==== Q4: I use ESS, but have disabled feed-back, is a grid-code still required? ==== |
- | It needs to be clear to anyone working on the system | + | A: Yes, also in this case LOM is required |
- | Q: I use ESS, but have disabled feed-back, is a grid-code still required? | ||
- | A: Yes, also in this case there is extra logic necessary to detect a Loss of Mains in all circumstances. | ||
- | ===== DISQUS ===== | ||
- | ~~DISQUS~~ |
ve.bus/grid-codes-and-loss-of-mains-detection.1511873712.txt.gz · Last modified: 2017-11-28 13:55 by mvader