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BSI PD CLC/TS 51643-32:2020

BSI PD CLC/TS 51643-32:2020

$189.07

Low-voltage surge protective devices – Surge protective devices connected to the DC side of photovoltaic installations. Selection and application principles

Published By Publication Date Number of Pages
BSI 2020 48
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This document describes the principles for selection, installation and coordination of SPDs intended for use in Photovoltaic (PV) systems up to 1500 V DC and for the AC side of the PV system rated up to 1000 V RMS 50/60 Hz.

The photovoltaic installation extends from a PV array or a set of interconnected PV-modules to include the associated cabling and protective devices and the converter up to the connection point in the distribution board or the utility supply point.

This document considers SPDs used in different locations and in different kinds of PV systems:

  • PV systems located on the top of a building;

  • PV systems located on the ground like free field power plants characterized by multiple earthing and a meshed earthing system.

The term PV installation is used to refer to both kinds of PV systems. The term PV power plant is only used for extended free-field multi-earthed power systems located on the ground.

For PV installations including batteries additional requirements could be necessary.

NOTE 1 The HD 60364 series, EN 62305 series and CLC/TS 61643-12 also apply.

NOTE 2 This document deals only with SPDs and not with surge protective components integrated inside equipment (e.g. inverters, (PCE) power conversion equipment).

PDF Catalog

PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
10 3 Terms and definitions
13 4 Systems and equipment to be protected
14 5 Overvoltages in a PV installation
6 Selection and erection of SPDs
6.1 General
15 6.2 Requirements for different PV installations
6.2.1 General
16 6.2.2 PV installation without an external LPS
6.2.3 PV installation with an external LPS when the separation distance (s) is maintained (excluding multi-earthed solar systems, such as PV power plants)
18 6.2.4 PV installation with an external LPS where the separation distance (s) cannot be maintained (including multi-earthed systems, such as PV power plants)
6.2.5 PV installation including communication and signalling circuits
19 6.3 Selection and erection of SPDs installed on the AC side
6.3.1 General
6.3.2 Selection of SPDs with regard to nominal discharge current In and impulse current Iimp
6.3.3 Selection of SPDs with regard to voltage protection level Up
6.3.4 Installation of SPDs on the AC side
21 6.4 Selection and erection of SPDs installed on the DC side
6.4.1 General
6.4.2 Selection of SPDs with regard to nominal discharge current In and impulse current Iimp
6.4.3 Selection of UCPV of SPDs on the DC side
6.4.4 Selection of SPDs with regard to its leakage current IPE
6.4.5 Selection of SPDs with regard to voltage protection level Up
22 6.4.6 Installation of SPDs on the DC side
23 6.4.7 Cross-sections of connecting conductors for SPDs on the DC side
24 6.4.8 Connection schemes of assemblies of SPDs on the DC side.
25 6.4.9 Selection of ISCPV of SPDs on the DC side
26 6.5 Coordination of SPDs
7 Earthing Arrangement
27 8 Requirements for the installation of surge protective devices (SPDs) in a PV system
9 Maintenance
28 Annex A (normative)Determination of the value of Iimp or In for SPDs according to the simplified approach for different structures protected by an LPS
A.1 Introduction
29 A.2 Building with a PV installation on the roof according to 6.2.4
32 A.3 Free- field PV power plant
36 A.4 Selection of Type 1 SPDs impulse current Iimp when A.2 or A.3 cannot be applied.
37 Annex B (informative)Characteristics of a PV source
B.1 PV source characteristics
40 B.2 Calculation of UOC MAX
B.3 Calculation of ISC MAX
41 Annex C (informative)Additional information to Clause 6: Selection and erection of SPDs and to Clause 7: Earthing Arrangement
C.1 PV installation including communication and signalling circuits
43 C.2 PV installation and dimensions of equipotential bonding conductors

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BSI PD CLC/TS 51643-32:2020
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