In medium to large photovoltaic systems, safety and availability of the system and protection of the operating personnel is very important. Any electrical isolation and the peak performance of the system play a substantial role in the selection of suitable monitoring measures. In general, it is important to locate the fault quickly and automatically.
In small photovoltaic systems, protection of the house residents and possible operators (fire brigade, chimney sweep) is very important. The inverters are mostly factory-equipped with the appropriate safety equipment. They are only safe enough if they can also detect symmetric faults caused by moisture and dirt. At the point of transfer between the internal network and the general power grid, the voltage and frequency must be checked at a predefined range.
Before internal generation systems (photovoltaics, water power, CHP, biogas, etc.) can feed electrical energy into the public grid, an automatic switching point must be installed between the generation system and the low voltage network. This checks whether the frequency and voltage fed in are within the specified range. The three-phase voltage monitoring relay is used to pre-configure numerous standard specifications at the touch of a button.
| Name | Category | Size | Language | Timestamp | D-/B-Number |
|---|---|---|---|---|---|
| Product Overview ISOMETER®/ISOSCAN® | Product Overviews | 5.3 MB | EN | 2024/02/1616.02.2024 | |
| Renewable Energies | Market Segment Brochures | 3.6 MB | EN | 2025/04/0303.04.2025 | |
| EDS309x | Application note | 1.4 MB | EN | 2019/05/1313.05.2019 | D00012 |
| Electrical Safety in Control and Auxiliary Circuits | Technical article | 632.6 KB | EN | 2019/05/1313.05.2019 | |
| Safe Connection to the Grid VMD460-NA | Flyer | 222.0 KB | EN | 2019/05/1313.05.2019 | D00001 |
| Operating Photovoltaic Installations Safely and Efficiently | Technical article | 457.2 KB | EN | 2019/05/1313.05.2019 | |
| The largest photovoltaic system in Latin America | Technical article | 20.0 B | EN | 2023/04/2121.04.2023 |
Products
Network and system protection (NS protection) for monitoring the power infeed of power generation systems
Insulation monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V
Insulation monitoring device for photovoltaic systems up to AC 793 V/DC 1100 V
Insulation monitoring device for unearthed systems in photovoltaic installations up to AC 1000 V/DC 1500 V
Portable insulation fault location systems for unearthed and earthed systems (IT and TN systems)
Network and system protection (NS protection) for monitoring the power infeed of power generation systems
Insulation monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V
Insulation monitoring device for photovoltaic systems up to AC 793 V/DC 1100 V
Insulation monitoring device for unearthed systems in photovoltaic installations up to AC 1000 V/DC 1500 V
Portable insulation fault location systems for unearthed and earthed systems (IT and TN systems)
Measuring relays and protection equipment - Part 127: Functional requirements for over/under voltage protection
Electrical safety in low voltage distribution systems up to 1 000 v a.c. and 1 500 v d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 8: Insulation monitoring devices for IT systems.
Anwendungsregel:2011-08 Erzeugungsanlagen am Niederspannungsnetz Technische Mindestanforderungen für Anschluss und Parallelbetrieb von Erzeugungsanlagen am Niederspannungsnetz
Regola tecnica di riferimento per la connessione di Utenti attivi e passivi alle reti AT ed MT delle imprese distributrici di energia elettrica (Reference technical rules for the connection of active and passive consumers to the HV and MV electrical networks of distribution Company)
Specifieke technische aansluitingsvoorschriften voor gedecentraliseerde productie-installaties die in parallel werken met het distributienet
Recommendations for the Connection of Type Tested Small-scale Embedded Generators (up to 16A per phase) in parallel with Low Voltage Distribution Systems
Selbsttätige Schaltstelle zwischen einer netzparallelen Eigenerzeugungsanlage und dem öffentlichen Niederspannungsnetz
Recommendations for the Connection of Generating Plant to the Distribution Systems of Licensed Distribution Network Operators
Recommendations for the Connection of Generating Plant to the Distribution Systems of Licensed Distribution Network Operators
