Differences

This shows you the differences between two versions of the page.

--- ve.bus:grid-codes-and-loss-of-mains-detection [2017-12-08 12:08] – mvader
+++ ve.bus:grid-codes-and-loss-of-mains-detection [2019-01-22 10:16] – external edit 127.0.0.1
@@ Line 8: / Line 8: @@
 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 MultiGrid is and can be certified to be used without having to add more external anti-islanding safety devices (ENS). And in yet other countries an external ENS is required and/or the inverter/charger must be configured with the right grid-code. Check the safety certificates on our website to see the allowed models for your country.
-===== 2. Loss of mains detection (L.O.M.) =====
+===== 2. Loss of mains detection (LOM) =====
-==== What is L.O.M. detection? ====
+==== What is LOM detection? ====
-L.O.M. is an automatic process that detects a change and so loss of the mains/network/grid supply. After the detection, the inverter/charger will open its back-feed relay, making sure there is no live AC voltage on its AC-inputs, and anything connected to these inputs.
+LOM is an automatic process that detects a change and so loss of the mains/network/grid supply. After the detection, the inverter/charger will open its back-feed relay, making sure there is no live AC voltage on its AC-inputs, and anything connected to these inputs.
-==== Why is L.O.M. detection required? ====
+==== Why is LOM detection required? ====
-The purpose of L.O.M 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.
@@ Line 27: / Line 27: @@
 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.
@@ Line 77: / Line 78: @@
 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? ====
 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~~