Using a fuse on grounded solar arrays for ground-fault protection can create the "blind spot" issue - a ground fault on the already grounded conductor of a PV array may not drive sufficient current to trip the fuse. Additional faults can go undetected and may cause unexpected behavior, leading to a high risk of fire.
Bender's ground-fault relays detect low-level AC and DC ground faults on grounded arrays by using a differential measurement method, mitigating the blind spot issue. Advanced technology alerts technicians to conditions that may lead to damage to equipment or fire.
In small photovoltaic systems, protection of the house residents and possible operators (fire department, 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 Notes | 1.4 MB | EN | 2019/05/1313.05.2019 | D00012 |
| Insulation Fault Location - Planning and Setup | Technical Article | 112.4 KB | EN | 2019/05/1313.05.2019 | |
| 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 | Flyers | 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 | 447.8 KB | EN | 2019/05/1313.05.2019 |
Products
Network and system protection (NS protection) for monitoring the power infeed of power generation systems
Ground-fault monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V
Ground-fault monitoring device for photovoltaic systems up to AC 793 V/DC 1100 V
Portable ground-fault location systems for ungrounded and grounded systems
Network and system protection (NS protection) for monitoring the power infeed of power generation systems
Ground-fault monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V
Ground-fault monitoring device for photovoltaic systems up to AC 793 V/DC 1100 V
Portable ground-fault location systems for ungrounded and grounded systems
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)
Anwendungsregel:2011-08 Erzeugungsanlagen am Niederspannungsnetz Technische Mindestanforderungen für Anschluss und Parallelbetrieb von Erzeugungsanlagen am Niederspannungsnetz
Anwendungsregel:2018-11 Technische Regeln für den Anschluss von Kundenanlagen an das Mittelspannungsnetz und deren Betrieb (TAR Mittelspannung)
Specifieke technische aansluitingsvoorschriften voor gedecentraliseerde productie-installaties die in parallel werken met het distributienet
Selbsttätige Schaltstelle zwischen einer netzparallelen Eigenerzeugungsanlage und dem öffentlichen Niederspannungsnetz (Norm wurde zurückgezogen und durch DIN VDE V 0126-1-1 ersetzt)
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
Recommendations for the Connection of Type Tested Small-scale Embedded Generators (up to 16A per phase) in parallel with Low Voltage Distribution Systems
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
Messrelais und Schutzeinrichtungen - Teil 127: Funktionsnorm für Über-/Unterspannungsschutz
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V – Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen - Teil 8: Isolationsüberwachungsgeräte für IT-Systeme
