Solar

Operating photovoltaic systems safely with high availability

PV power plants > 50 kW

High availability of large PV systems

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. 

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PV power plants <= 50 kW

Electrical safety at home

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.

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Network and system protection

Safe voltage and frequency levels

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.

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Downloads

NameCategorySizeLanguageTimestampD-/B-Number
Product Overview ISOMETER®/ISOSCAN® Product Overviews 5.3 MB EN2024/02/1616.02.2024
Renewable Energy Market Segment Brochures 4.3 MB EN2017/02/2727.02.2017
EDS309x Application note 1.4 MB EN2019/05/1313.05.2019D00012
Electrical Safety in Control and Auxiliary Circuits Technical article 632.6 KB EN2019/05/1313.05.2019
Safe Connection to the Grid VMD460-NA Flyer 222.0 KB EN2019/05/1313.05.2019D00001
Operating Photovoltaic Installations Safely and Efficiently Technical article 457.2 KB EN2019/05/1313.05.2019
The largest photovoltaic system in Latin America Technical article 20.0 B EN2023/04/2121.04.2023

Products

Measuring and monitoring relays

LINETRAXX® VMD460-NA
LINETRAXX® VMD460-NA

Network and system protection (NS protection) for monitoring the power infeed of power generation systems

Insulation monitoring

ISOMETER® isoPV1685/isoPV1685PFR
ISOMETER® isoPV1685RTU/isoPV1685P

Insulation monitoring device for unearthed systems in photovoltaic installations up to AC 1000 V/DC 1500 V

ISOMETER® isoPV425 mit AGH420
ISOMETER® isoPV425 with AGH420

Insulation monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V

ISOMETER® isoPV mit AGH-PV
ISOMETER® isoPV with AGH-PV

Insulation monitoring device for photovoltaic systems up to AC 793 V/DC 1100 V

Insulation fault location

ISOSCAN® EDS30…
ISOSCAN® EDS30…

Portable insulation fault location systems for unearthed and earthed systems (IT and TN systems)

Measuring and monitoring relays

LINETRAXX® VMD460-NA
LINETRAXX® VMD460-NA

Network and system protection (NS protection) for monitoring the power infeed of power generation systems

Details

Insulation monitoring

ISOMETER® isoPV1685/isoPV1685PFR
ISOMETER® isoPV1685RTU/isoPV1685P

Insulation monitoring device for unearthed systems in photovoltaic installations up to AC 1000 V/DC 1500 V

Details
ISOMETER® isoPV425 mit AGH420
ISOMETER® isoPV425 with AGH420

Insulation monitoring device for photovoltaic systems up to AC 690 V/DC 1000 V

Details
ISOMETER® isoPV mit AGH-PV
ISOMETER® isoPV with AGH-PV

Insulation monitoring device for photovoltaic systems up to AC 793 V/DC 1100 V

Details

Insulation fault location

ISOSCAN® EDS30…
ISOSCAN® EDS30…

Portable insulation fault location systems for unearthed and earthed systems (IT and TN systems)

Details

Standards

DIN EN 60255-127

Measuring relays and protection equipment - Part 127: Functional requirements for over/under voltage protection

EN 61557-8

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.

BDEW
G59/3

Recommendations for the Connection of Generating Plant to the Distribution Systems of Licensed Distribution Network Operators

G59/2

Recommendations for the Connection of Generating Plant to the Distribution Systems of Licensed Distribution Network Operators

G83/2

Recommendations for the Connection of Type Tested Small-scale Embedded Generators (up to 16A per phase) in parallel with Low Voltage Distribution Systems

DIN V VDE V 0126-1-1

Selbsttätige Schaltstelle zwischen einer netzparallelen Eigenerzeugungsanlage und dem öffentlichen Niederspannungsnetz

CEI 0-21

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)

C10/11

Specifieke technische aansluitingsvoorschriften voor gedecentraliseerde productie-installaties die in parallel werken met het distributienet

VDE-AR-N 4105

Anwendungsregel:2011-08 Erzeugungsanlagen am Niederspannungsnetz Technische Mindestanforderungen für Anschluss und Parallelbetrieb von Erzeugungsanlagen am Niederspannungsnetz

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