IEC 61400-24:2019/AMD1:2024

Amendment 1 - Wind energy generation systems - Part 24: Lightning protection

Amendement 1 - Systèmes de génération d'énergie éolienne - Partie 24: Protection contre la foudre

General Information

• Status: Published
• Publication Date: 12-Nov-2024
• ICS: 27.180 - Wind turbine energy systems
• Technical Committee: TC 88 - Wind energy generation systems
• Drafting Committee: MT 24 - TC 88/MT 24
• Current Stage: PPUB - Publication issued
• Start Date: 22-Nov-2024
• Completion Date: 13-Nov-2024

Relations

• Amends: IEC 61400-24:2019 - Wind energy generation systems - Part 24: Lightning protection
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61400-24 ®
Edition 2.0 2024-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Wind energy generation systems –
Part 24: Lightning protection
Systèmes de génération d'énergie éolienne –
Partie 24: Protection contre la foudre
IEC 61400-24:2019-07/AMD1:2024-11(en-fr)

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IEC 61400-24 ®
Edition 2.0 2024-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Wind energy generation systems –

Part 24: Lightning protection
Systèmes de génération d'énergie éolienne –

Partie 24: Protection contre la foudre

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180  ISBN 978-2-8322-9911-1

– 2 – IEC 61400-24:2019/AMD1:2024
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND ENERGY GENERATION SYSTEMS –

Part 24: Lightning protection
AMENDMENT 1
FOREWORD
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Amendment 1 to IEC 61400-24:2019 has been prepared by IEC technical committee 88: Wind
energy generation systems.
The text of this Amendment is based on the following documents:
Draft Report on voting
88/1040/FDIS 88/1054/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.

© IEC 2024
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
A list of all parts in the IEC 61400 series, published under the general title Wind energy
generation systems, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
___________
INTRODUCTION to Amendment 1
This amendment to IEC 61400-24:2019 addresses an update of the content in Annex L
regarding monitoring systems for detecting lightning strikes on wind turbines.

___________
2 Normative references
Add the following document to the existing list, after IEC 62305-4:2010:
IECRE OD-501, Type and Component Certification Scheme (wind turbines)

– 4 – IEC 61400-24:2019/AMD1:2024
© IEC 2024
Replace the existing Annex L with the following new Annex L:
Annex L
(informative)
Lightning detection and measurement systems
L.1 General
L.1.1 Purpose
It is recommended that wind turbines are equipped with systems capable of detecting lightning,
measuring its current components, and processing the parameters of the lightning strikes. The
purpose of such systems is to:
• provide information to the operator on the occurrence of lightning strikes to the wind turbine
and to give input to operation and maintenance regimes;
• provide valuable data on lightning strikes to wind turbines thus allowing post-assessment of
the lightning magnitude/characteristics and contribution to the operator's risk assessment
processes;
• enable the operator to compare the measured current parameters of lightning strikes to the
lightning protection level, LPL, used for designing the wind turbine lightning protection
system (e.g. for assessing if the lightning current intercepted by the LPS is below or above
the values defined in Table 1);
• avoid hazardous activities such as maintenance when there is a risk of lightning strike.
L.1.2 Nomenclature
The following nomenclature applies to this annex.
a) Thunderstorm warning systems (TWS), composed of thunderstorm detector(s) able to
monitor the lightning or upcoming lightning activity and tools for processing the acquired
data to provide a valid alarm (warning). They are based on local sensors (either based on
electrostatic or electromagnetic fields), a group of local sensors or lightning location
systems (LLS).
b) Lightning measurement systems (LMS) measuring lightning events and their features with
devices installed on the turbine. These systems range from a combination of simple
electromechanical event counters to complex systems measuring and analyzing lightning
parameters.
L.2 Benefits of lightning detection and measurement systems
There are many benefits of measuring actual lightning exposure. Depending on the specific
stakeholder, a non-exhaustive list is included in Table L.1, Table L.2 and Table L.3. The
industry is encouraged to share lightning data across all stakeholders (OEM/Owner/Insurance),
to ensure benefits across the entire value chain.

© IEC 2024
Table L.1 – Considerations and benefits for the OEM (original equipment manufacturer)
Statement Value aspect
For turbines delivered with long service contracts, the OEM (Original This enables condition-based
Equipment Manufacturer) with a service contract would like to know when maintenance or repair, lowering
the receptor/LPS has reached the design lifetime and needs to be downtime and unexpected damage
replaced. This can be achieved by monitoring the accumulated charge costs significantly. Maintenance is
and specific energy for each blade and correlating with test performance cheaper than repair.
of the receptor/LPS.
The OEM would like to know all information of strikes, to determine the This information is used to market
efficiency of the receptors/LPS (the observed number of strikes the OEM products, "with a field
intercepted correctly divided by the total number of strikes to the efficiency of XX%, o
...