WG 11 - TC 8/WG 11

IEC TS 63222‑4:2026 specifies the requirements of the models, methods and procedures for harmonic analysis on the public electric power network. This document is applicable to harmonic analysis up to 40th harmonic at high, medium and low voltage of the public electric power network with nominal frequency of 50 Hz or 60 Hz.

IEC TS 62749:2026 specifies the expected characteristics of electricity at the point of supply of public low, medium and high voltage, 50 Hz or 60 Hz, networks, as well as power quality assessment methods. This document does not apply for systems operated above 230 kV.
The boundaries between the various voltage levels can be different for different countries or regions. In the context of this document, the following terms for system voltage are used:
- low voltage (LV) refers to UN ≤ 1 kV;
- medium voltage (MV) refers to 1 kV  - high voltage (HV) refers to 35 kV  Because of existing network structures, in some countries or regions, the boundary between medium and high voltage can be different. While power quality is related to EMC in a number of ways, especially because compliance with power quality requirements depends on the control of cumulative effect of electromagnetic emission from all or multiple equipment and installations, this document is not an EMC publication (see also Annex E).
This third edition cancels and replaces the second edition published in 2020. This edition includes the following significant technical changes with respect to the previous edition:
- clarification that harmonic orders recommended in this document are up to 40th;
- 4.6 is modified accordingly;
- iteration that this document does not apply for systems operated above 230 kV;
- deletion of Annex C;
- improvement of 4.10;
- update of profiles and addition of new profiles;
- modifications to align with EN 50160:2022 and EN 50160:2022/AMD1:2025.

IEC TS 63222-1:2026 is intended to provide provisions associated to the main use cases regarding recognized engineering practices applicable to power quality management in public electric power supply networks. It summarizes the operation in power quality management and investigates the current standards, for requirement of power quality assessment work, as well as to promote the development of power quality management best practices. The power quality management domain groups use cases and associated power quality requirement common to network management, including customer support network operation, network and extension planning. This document captures possible "common and repeated usage" of power quality management under the format of "use case". Use case implementations are given for information purpose only. This document derives the common requirement as provisions by further standardization activities, in terms of actors interacting with the given system. The interface requirement is considered for later standardization activities. The relationship of the stakeholders in power quality management, such as network operator, network user, etc, are discussed in the document.
This second edition cancels and replaces the first edition published in 2022. This edition includes the following significant technical changes with respect to the previous edition:
- this document completes the use cases planned in IEC 63222-1:2022: four business use cases and three system use cases are added;
- this document makes adjustments to the wording of certain phrases and technical details in IEC 63222-1:2022.

IEC TR 63222-101:2025 aims to provide guidelines for power quality data applications on different aspects in public power supply systems at voltage ranges from LV, MV and HV with 50 Hz or 60 Hz rated frequency. It intends to provide a methodology for mining hidden knowledge and support power quality management based on PQ data analytics. Its primary goal is to serve different aspects of power system to promote the system maintaining its normal state and improve efficiency. It can also help avoid unexpected system events, equipment malfunction/maloperation, and production process interruption. The various methodologies and methods mentioned in this document are optional.

IEC TS 63222-3:2024 is intended to provide provisions regarding recognized engineering practices applicable to assess the user’s characteristics in power quality predicted assessment. It summarizes the best practice in non-linear, unbalanced, impact and fluctuating loads or generations modelling for power quality disturbance anticipation in public power systems at the planning stage.
This document focuses on frequency-domain modelling for AC power quality analysis in electric power networks, typically in the range up to the 50th harmonic (2,5 kHz in 50 Hz systems or 3 kHz in 60 Hz systems). Unbalance is analyzed in three-phase systems and only negative sequence component is considered. The approach and modelling guidelines provided are valid on the representation of user installations connected to power systems acting as sources of disturbance. Modelling of the network elements is out of the scope of the document.
These guidelines will be valuable in the definition of power quality performance specifications for user equipment. They will also assist users when modelling their installation to assess or demonstrate compliance with the emission limits provided by the system owner/operator and to investigate and specify mitigation measures.

IEC TS 63222-2:2023 defines technical requirements for designing a power quality monitoring system for public power supply networks. It is applicable for LV, MV and HV public power supply networks.
The design procedure of a power quality monitoring system (PQMS) generally includes the following four steps:
• Step 1: purpose and application analysis: Analyse power quality monitoring (PQM) demand and define the purpose of PQM.
• Step 2: preliminary study: Collect background information such as network configuration, the parameters of instrument transformers, e.g. the output levels and performance capabilities, attributes of loads or distributed generations (DG), communication conditions, budgets, and other restrictive conditions, and select the parameters to be monitored and monitoring sites according to corresponding principles.
• Step 3: system structure design: Design the overall structure of the monitoring system according to the monitoring purpose based on the analysis of the advantages and disadvantages of various system structures.
• Step 4: detailed design of functional modules: Design the function modules of data collection, communication, data storage, data processing and analysis in detail according to the functional requirements.
This document defines the main purposes of PQM and gives recommendations for preliminary study, such as how to select monitoring sites and monitoring parameters and whether the instrument transformer is suitable for monitoring. This document also classifies the PQMS structure and specifies the functional requirements of the modules such as data collection, communication, data storage, data processing and analysis.

IEC TS 63222-1:2021(E), which is a Technical Specification, is intended to provide provisions associated to the main use cases regarding recognized engineering practices applicable to power quality management in public electric power supply networks. It summarizes the operation in power quality management and investigates the current standards, for requirement of power quality assessment work, as well as to promote the development of power quality management best practices.
The power quality management domain groups use cases and associated power quality requirements common to network management, including customer support network operation, network and extension planning.
This document captures possible "common and repeated usage" of power quality management under the format of "use case". Use case implementations are given for information purpose only. This document derives the common requirement as provisions by further standardization activities, in terms of actors interacting with the given system. The interface requirement is considered for later standardization activities. The relationship of the stakeholders in power quality management, such as network operator, network user, etc., are discussed in the document.

IEC TS 62749:2020 specifies the expected characteristics of electricity at the SUPPLY TERMINALS of public low, medium and high voltage, 50 Hz or 60 Hz, networks.
NOTE 1 The boundaries between the various voltage levels can be different for different countries/regions. In the context of this TS, the following terms for system voltage are used:
- low voltage (LV) refers to less than or equal to 1 kV;
- medium voltage (MV) refers to between 1 kV and 35 kV;
- high voltage (HV) refers to between 35 kV and 230 kV.
While power quality is related to EMC in a number of ways this document is not an EMC publication. This second edition cancels and replaces the first edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) minimum number of remaining data for weekly analysis,
b) improvement of the compatibility between EN 50160 and IEC TS 62749,
c) further explanation of the conception of daily sliding window,
d) further explanation of the aggregation method used for events,
e) further explanation of the relation between Power Quality and EMC,
f) addition of a new definition of mains communicating system (MCS),
g) addition of a new Annex G: Other phenomena,
h) transfer of the main content of IEC TR 62510 to IEC TS 62749.

IEC TS 62749:2015(E) specifies the expected characteristics of electricity at the SUPPLY TERMINALS of public low, medium and high voltage, 50 Hz or 60 Hz, networks.