APPLICATION GUIDE FOR USE GRID
AND SYSTEM PROTECTION
Fronius grid and system protection solutions for SnapINverter, GEN24
Plus, Tauro, and mixed systems
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© Fronius International GmbH
Version 1.0 07/2021
Peter Schmidhuber, Franz Breitwieser, Maximilian Neuhaus, Leonhard Peböck, Jasmin Gross
Solar Energy
Fronius reserves all rights, in particular rights of reproduction, distribution and translation. No part of this document may be reproduced,
in any form whatsoever, or stored, processed, duplicated or disseminated with the aid of electronic systems, without the written consent
of Fronius. You are hereby reminded that the information published in this document, despite the greatest care being exercised in its
preparation, is subject to change and that neither the author nor Fronius can accept any legal liability. Gender-specific wording refers
equally to the male and female form.
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TABLE OF CONTENTS
1
Introduction .....................................................................................................................................4
2 Fronius grid and system protection solution ..............................................................................5
3 Solution for SnapINverter ..............................................................................................................6
4 GEN24 and/or Tauro .......................................................................................................................7
4.1 Communication and connection .......................................................................................................7
5 Combination of SnapINverter & GEN24/Tauro ............................................................................8
5.1 Communication and connection .......................................................................................................8
6 Visualization in Fronius Solar.web ............................................................................................ 10
7 Specific requirements with DC-SPDs ........................................................................................ 11
7.1 Requirements for GEN24 Plus ...................................................................................................... 11
7.2 Requirements for SnapINverter ..................................................................................................... 12
7.3 Requirements for Tauro ................................................................................................................. 12
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1 INTRODUCTION
A grid and system protection solution ensures PV systems can be operated safely. A grid and system
protection solution is a protection device which continuously monitors the voltage and frequency of the grid for
the specified switch-off conditions. It therefore ensures the generator is switched off safely if voltage and
frequency limits in the grid are not complied with.
The grid and system protection solution consists of several components and can be implemented differently
depending on the size of the system and country-specific requirements. This document describes solutions for
external grid and system protection that act on the internal section switch. Particular attention is paid to
explaining grid and system protection solutions for Fronius inverters from the Fronius SnapINverter, Fronius
GEN24 Plus, and Fronius Tauro series.
CAUTION: The normative requirements for grid and system protection differ from country to country.
Please clarify the requirements with your grid operator!
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