Standards Development

Scope

This International Standard applies to switching device for islanding, hereafter referred to as SDFI, for household and similar uses, primarily intended to be used for energy efficiency (EE) purposes with local production and/or storage of energy.

SDFI are intended to be installed in low voltage prosumer electrical installations (PEI) intended to operate in island mode as defined in IEC 60364-8-82.

SDFI are intended to be installed in low voltage prosumer electrical installations (PEI) to deliver the electrical energy:

– either to current-using equipment (direct feeding mode or island mode);

– and/or to the grid (reverse feeding mode); SDFI are part of the electrical installation.

This document applies to SDFI for operation in AC single or multiphase main circuits with rated voltages not exceeding 440 V AC, frequencies of 50 Hz, 60 Hz or 50/60 Hz. They are intended to be used in installations with prospective short circuit currents not exceeding 25 000 A. DC operations are not covered by this edition and are kept under consideration for a future revision of this document.

SDFI can be operated with interlocks and/or synchronization

Purpose

IEC 60364-8-82 has the objective to ensure that the low-voltage electrical installation is compatible with the existing and future ways to deliver safely and functionally the electrical energy to current -using equipment wherever the electrical energy comes from the DSO or local generation. IEC 60364 -8-82 provides requirements and recommendations that apply to low-voltage electrical installations connected or not to a distribution network able to operate:

– with local power supplies, and/or

– with local storage units,

and that monitors and controls the energy from the locally connected sources delivering it to:

– current-using equipment, and/or

– local storage units, and/or

– distribution networks.

Such electrical installations are designated as prosumer's electrical installations (PEIs) by IEC 60364 -8-82 which defines specific devices (or functions) to ensure the correct and safe operation of PEI depending on their operating mode. In the case of an islandable PEI, IEC 60364 -8-82 defines a “Switching Device For islanding (SDFI), identified as device 4 in attached Figure 1 (reproduced from IEC 60364 -8-82:2022, Figure 4).

The objective of this document is to define the functions and requirements of a SDFI in line with the requirements stated in IEC 60364-8-82