IEC TS 63222-1:2021

IEC TS 63222-1 ®
Edition 1.0 2021-12
TECHNICAL
SPECIFICATION
colour
inside
Power quality management –
Part 1: General guidelines
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IEC TS 63222-1 ®
Edition 1.0 2021-12
TECHNICAL
SPECIFICATION
colour
inside
Power quality management –
Part 1: General guidelines
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.020 ISBN 978-2-8322-1061-4

– 2 – IEC TS 63222-1:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 10
3.1 Terms and definitions . 10
3.2 Abbreviated terms . 12
4 Use cases list . 13
4.1 List of business use case and business roles of the domains . 13
4.2 List of system use cases and system roles . 15
5 Provisions . 16
5.1 Power quality assessment . 16
5.1.1 General . 16
5.1.2 Monitoring assessment . 17
5.1.3 Monitoring assessment process . 17
5.1.4 Predicted assessment. 18
5.1.5 Predicted assessment process . 18
5.1.6 Background description and analysis . 18
5.1.7 Disturbance anticipation . 18
5.1.8 Impacts analysis . 19
5.2 PQ monitoring system . 19
5.2.1 General . 19
5.2.2 Monitoring points . 19
5.2.3 Monitoring equipment . 20
5.2.4 Related information and communication system . 20
5.3 Economical assessment . 20
5.3.1 General . 20
5.3.2 Economical assessment of PQ provisions . 21
5.3.3 Economical assessment of unsatisfactory PQ objectives/results . 22
5.4 PQ requirement . 23
5.5 Mitigation/Trouble shooting . 23
5.5.1 Total requirements . 23
5.5.2 Power quality mitigation scheme . 24
Annex A (normative) Use case . 26
A.1 Business use cases . 26
A.1.1 BUC 1: Manage power quality over the grid . 26
A.1.2 BUC 2: Manage complaints on power quality over the network . 28
A.1.3 BUC 3: Provide reports on network power quality . 36
A.1.4 BUC 4: Take into account power quality constraints in connecting a
user to the grid . 42
A.2 System UCs . 48
A.2.1 SUC1: Measure power quality on a specific point of the network . 48
A.2.2 SUC2: Monitor power quality on the network. 60
A.2.3 SUC3: Assess the emission limit related to power quality technical
parameters in power system . 69
Annex B (informative) Main contents and requirements of power quality monitoring
assessment report . 74

B.1 Overview. 74
B.2 Basic information of the assessment object . 74
B.3 Basic information of power grid . 74
B.4 Basis of assessment and standard . 74
B.5 Monitoring instructions . 74
B.6 Analysis and conclusion . 74
B.7 Measures and suggestions (as required) . 74
B.8 Attachments . 74
Annex C (informative) Main contents and requirements of power quality predicted
assessment report . 75
C.1 Overview. 75
C.2 Basic information of the assessment object . 75
C.3 Basic situation of power grid . 75
C.4 Basis of assessment and standard . 75
C.5 Brief description of assessment method . 75
C.6 Calculation and analysis . 76
C.7 Measures and suggestions (as required) . 76
C.8 Conclusion . 76
C.9 Attachments . 76
Annex D (informative) Economic data of power quality . 77
D.1 Data structure . 77
D.2 Basic data of economic cost of power users . 77
D.3 Basic data of economic cost of public distribution network . 78
D.4 Power quality related monitoring data . 78
D.5 Equipment and system parameters . 79
Bibliography . 80
IEC references . 80
Non-IEC references . 81

Figure 1 – Organisation of the use cases . 13
Figure 2 – Overview of the power quality management main functions . 17

Table 1 – Content of IEC TS 63222-1 . 8
Table 2 – Abbreviations of IEC TS 63222-1 . 12
Table 3 – Lists of business use cases . 14
Table 4 – Business roles of IEC TS 63222-1 . 15
Table 5 – Lists of the system use cases . 15
Table 6 – Lists of system roles . 16

– 4 – IEC TS 63222-1:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
POWER QUALITY MANAGEMENT –
Part 1: General guidelines
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC TS 63222 has been prepared by IEC technical committee 8: System aspects of electrical
energy supply. It is a Technical Specification.
The text of this Technical Specification is based on the following documents:
Draft Report on voting
8/1588/DTS 8/1602/RVDTS
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 Technical Specification is English.

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/standardsdev/publications.
A list of all parts in the IEC 63222 series, published under the general title Power quality
management, 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,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
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– 6 – IEC TS 63222-1:2021 © IEC 2021
INTRODUCTION
With the development of smart grid and massive deployment of renewable energy, power
quality issues have received attention not only from system operators and customers
(especially with sensitive power quality loads) but also from market regulators with the
demands to provide information on the actual power quality level. Power quality management
of the grid is a systematic project which includes the whole process of planning, operation,
assessment and mitigation. The characteristics of power supplier, load characteristics of
power consumer and external environment will affect the power quality of the grid. This
document focuses on the whole process management and is the general guideline for this
series of standards.
Traditional electrified railways, steel mills and other non-linear loads are the main pollution
sources of the power quality. In recent years, the new loads such as new energy and electric
vehicles have brought new challenges to power quality management. The rapid popularization
and application of high-tech precision technology has also put forward new requirements for
high-quality power supply and consumption system.
Power quality is an important issue for electricity supply network operators, which needs to be
handled at planning and operation stages. In order to achieve power quality target, reduce
power quality impacts/losses and improve the economic efficiency of the system, power
quality regulation and supervision of the operating power system is necessary, and a well-
considered power quality planning before project implementation is also needed, such as
system expansion, construction and grid connection of the distributed generation. Besides,
the users at the end of power system should also be taken into consideration. Power quality
problems can cause system instability, equipment abnormal operation and supply interruption.
Power quality management is a method to avoid further power quality problems after project
implementation.
The standard system in power quality management provides a technical basis for improving
power management level and standardizing power quality industry and market. As the general
guideline of the standard series, this specification summarizes the power quality indicators
and assessment methods, and analyses the overall power quality level by monitoring
assessment and predicted assessment. Monitoring system and field test are used to assess
the power quality level at different nodes of the grid, and solve users' power quality
complaints and other practical problems. Connection and monitoring points are reasonably
selected to assess the power quality levels of the grid in operation stage, and it also
contributes to the power quality mitigation. In addition, the economical assessment of power
quality is regulated in the document. Power quality management use cases in different typical
scenarios are shown in Annex A.

POWER QUALITY MANAGEMENT –
Part 1: General guidelines
1 Scope
This part of IEC 63222, 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. Table 1 highlights the domains and business use cases described.

– 8 – IEC TS 63222-1:2021 © IEC 2021
Table 1 – Content of IEC TS 63222-1
Domain Content Scope
Continuous monitoring operation for public
Described with 5 business use cases
power grid
1) Manage power quality over the grid.
2) Manage power quality through
distribution or transmission grid
interfaces with another network.
3) Take into account power quality
constraints in network operation.
4) Provide reports on network power
quality.
Power quality
5) Manage complaints on power quality
monitoring
over the network.
assessment
Described with 5 system use cases
1) Assess power quality on the network.
2) Measure power quality on a specific
point of the network.
3) Monitor power quality on the network.
4) Engineer a power quality provision.
5) Assess the emission limit related to
power quality technical parameters in
power system.
Power quality assessment of new
Described with 4 business use cases
construction, reconstruction or expansion
1) Manage power quality over the grid.
projects in the grid
2) Take into account power quality
constraints in connecting a user to the
grid.
3) Take into account power quality
constraints in network development.
4) Provide reports on network power
quality.
Power quality
Described with 7 system use cases
predicted
1) Predict power quality impact of a
assessment
construction work or maintenance.
2) Predict power quality impact of a new
connection or network development.
3) Measure power quality on a specific
point of the network.
4) Monitor power quality on the network.
5) Engineer a power quality provision.
6) Assess power quality on the network.
7) Assess the emission limit related to
power quality technical parameters in
power system.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 61000-3 (all parts), Electromagnetic compatibility (EMC) – Part 3: Limits
IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits − Limits for harmonic
current emissions (equipment input current ≤ 16 A per phase)
IEC 61000-3-3, Electromagnetic compatibility (EMC) – Part 3-3: Limits − Limitation of voltage
changes, voltage fluctuations and flicker in public low-voltage supply system, for equipment
with rated current ≤ 16 A per phase and not subject to conditional connection

IEC TS 61000-3-4, Electromagnetic compatibility (EMC) – Part 3-4: Limits − Limitation of
emission of harmonic currents in low-voltage power supply systems for equipment with rated
current greater than 16 A
IEC TS 61000-3-5, Electromagnetic compatibility (EMC) – Part 3-5: Limits − Limitation of
voltage fluctuations and flicker in low-voltage power supply systems for equipment with rated
current greater than 75 A
IEC TR 61000-3-6, Electromagnetic compatibility (EMC): Limits-Assessment of emission limits
for the connection of distorting installations to MV, HV and EHV power systems
IEC TR 61000-3-7, Electromagnetic compatibility (EMC): Limits − Assessment of emission
limits for the connection of fluctuating load installations to MV, HV and EHV power systems
IEC 61000-3-8, Electromagnetic compatibility (EMC) − Part 3: Limits − Section 8: Signalling
on low-voltage electrical installations − Emission levels, frequency bands and electromagnetic
disturbance levels
IEC 61000-3-11, Electromagnetic compatibility (EMC) − Part 3-11: Limits − Limitation of
voltage changes, voltage fluctuations and flicker in public low-voltage supply systems −
Equipment with rated current ≤ 75 A and subject to conditional connection
IEC 61000-3-12, Electromagnetic compatibility (EMC) − Part 3-12: Limits − Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current >16 A and ≤ 75 A per phase
IEC TR 61000-3-13, Electromagnetic compatibility (EMC) − Limits − Assessment of emission
limits for the connection of unbalanced installations to MV, HV and EHV power systems
IEC TR 61000-3-14, Electromagnetic compatibility (EMC) − Assessment of emission limits for
harmonics, interharmonics, voltage fluctuations and unbalance for the connection of
disturbing installations to LV power systems
IEC 61000-4 (all parts), Electromagnetic compatibility (EMC) − Part 4: Testing and
measurement techniques
IEC 61000-4-15, Electromagnetic compatibility (EMC) – Part 4-15: Testing and measurement
techniques − Flickermeter − Functional and design specifications
IEC 61000-4-30:2015, Electromagnetic compatibility (EMC) – Part 4-30: Testing and
measurement techniques − Power quality measurement methods
IEC 61850 (all parts), Communication networks and systems for power utility automation
IEC TR 61850-90-17:2017, Communication networks and systems for power utility automation
− Part 90-17: Using IEC 61850 to transmit power quality data
IEC 61968-9:2013, Application integration at electric utilities − System interfaces for
distribution management − Part 9: Interfaces for meter reading and control
IEC TS 62749: 2020, Assessment of power quality – Characteristics of electricity supplied by
public networks
ISO 10002:2018, Quality management – Customer satisfaction – Guidelines for complaints
handling in organizations
– 10 – IEC TS 63222-1:2021 © IEC 2021
3 Terms, definitions and abbreviated terms
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 Terms and definitions
3.1.1
power quality
characteristics of the electricity at a given point on an electrical power system, evaluated
against a set of reference technical parameters
[SOURCE: IEC 60050-617:2009, 617-01-05, modified – "electric current, voltage and
frequencies" has been changed to "electricity"]
3.1.2
power quality indices
technical parameters characterizing the quality of electricity, measured at a given point,
relevant for the assessment of the quality of the electricity delivered by a network operator
[SOURCE: IEC TS 62749:2020, 3.29]
3.1.3
nominal voltage
voltage by which a system is designated or identified
[SOURCE: IEC 61000-4-30:2015, 3.18]
3.1.4
voltage unbalance
in a polyphase system, a condition in which the RMS values of the phase voltages
(fundamental component) or the phase angles between consecutive phases are not all equal.
Note 1 to entry: The degree of the inequality is usually expressed as the ratios of the negative- and zero-
sequence components to the positive-sequence component.
Note 2 to entry: In this standard, voltage unbalance is considered in relation to 3-phase systems.
[SOURCE: IEC 60050-161:1990 161-08-09, modified – "phase voltages" has been changed to
"phase voltages (fundamental component)", notes to entry have been added]
3.1.5
voltage deviation
difference between the supply voltage at a given instant and the declared supply voltage
3.1.6
flicker
impression of unsteadiness of visual sensation induced by a light stimulus whose luminance
or spectral distribution fluctuates with time
[SOURCE: IEC 60050-161:1990 161-08-13]

3.1.7
voltage dip
a sudden reduction of the voltage at a point in an electrical system followed by voltage
recovery after a short period of time from a few cycles to a few seconds.
[SOURCE: IEC 60050-161:1990, 161-08-10]
3.1.8
short interruption
the disappearance of the supply voltage for a time interval whose duration is between two
specified limits
Note 1 to entry: A short interruption is considered to be a reduction of the supply voltage to less than 1 % of the
nominal voltage, with the lower limit of the duration typically a few tenths of a second, and its upper limit typically
in the order of one minute (or, in some cases up to three minutes).
[SOURCE: IEC 60050-161:1990,161-08-20]
3.1.9
harmonic component
sinusoidal component of a periodic quantity having a harmonic frequency
[SOURCE: IEC 60050-551:2001, 551-20-07, modified – The note has been deleted]
3.1.10
harmonic frequency
frequency which is an integer multiple greater than one of the fundamental frequency or of the
reference fundamental frequency
[SOURCE: IEC 60050-551:2001, 551-20-05]
3.1.11
interharmonic component
sinusoidal component of a periodic quantity having an interharmonic frequency
Note 1 to entry: For practical analysis, an approximation of the periodicity may be necessary.
[SOURCE: IEC 60050-551:2001, 551-20-08]
3.1.12
interharmonic frequency
frequency which is a non-integer multiple of the reference fundamental frequency
[SOURCE: IEC 60050-551:2001, 551-20-06]
3.1.13
system operator
network operator
party responsible for safe and reliable operation of a part of the electric power system in a
certain area and for connection to other parts of the electric power system
[SOURCE: IEC 60050-617:2009, 617-02-09]
3.1.14
(power) network user
(power) system user
party supplying electric power and energy to, or being supplied with electric power and energy
from, a transmission system or a distribution system
[SOURCE: IEC 60050-617:2009, 617-02-07]

– 12 – IEC TS 63222-1:2021 © IEC 2021
3.1.15
stakeholders
individual, group or organization that has an interest in an organization or activity
Note 1 to entry: Usually a stakeholder can affect or is affected by the organization or the activity.
[SOURCE: IEC 60050-904:2014, 904-01-10]
3.1.16
system average RMS variation frequency index
SARFI
a power quality index that provides a count or rate of voltage dips, swells, and/or interruptions
for a system.
[SOURCE: IEC TS 62749: 2020, 5.3.3.2]
3.1.17
distribution system operator
party operating a distribution system
[SOURCE: IEC 60050-617:2009, 617-02-10]
3.1.18
transmission system operator
party operating a transmission system
[SOURCE: IEC 60050-617:2009, 617-02-11]
3.2 Abbreviated terms
Abbreviations used in the text are defined in Table 2.
Table 2 – Abbreviations of IEC TS 63222-1
Abbreviation Definition
PQ Power Quality
BUC Business use case
SUC System use case
VSC Voltage Source Converter
PCC Point of Common Coupling
SCADA Supervisory Control and Data Acquisition
SARFI System Average RMS variation Frequency Index
FACTS Flexible AC Transmission Systems
SVC Static Var Compensator
STATCOM Static Synchronous Compensator
UPS Uninterrupted Power Supply
APF Active Power Filter
DVR Dynamic Voltage Restorer
LN Logical Node
RVC Rapid Voltage Change
RTC Real Time Clock
EMC Electromagnetic Compatibility
BESS Battery Energy Storage system

4 Use cases list
4.1 List of business use cases and business roles of the domains
The business use cases list is not exhaustive, and it is likely to grow as new use cases come
to light. The organisation of the use cases in the document and the links between them are
shown in Figure 1. Annex A gives the details of use cases.

Figure 1 – Organisation of the use cases
Table 3 lists and provides a brief description of the business use cases that have been
identified so far (they do not cover the entire domain business use cases). In Clause A.1, a
part of business use cases is developed.

– 14 – IEC TS 63222-1:2021 © IEC 2021
Table 3 – Lists of business use cases
Index of the business Identified business use Associated domain Brief description
use case case
UC63222-B001 Manage power quality Customer support, The business use case
over the grid Network operation, describes the system
Network and extension operator main processes
planning to manage power quality
disturbances for the
reliability of the power
system and ensures
continuity and quality of
the electrical energy
provided to the grid users
at their connection point
to the grid.
UC63222-B002 Manage complaints on Customer support, The business use case
power quality over the Network operation, describes the system
network Network and extension operator main processes
to resolve a power quality
planning
issue on a specific point
of the network.
UC63222-B003 Provide reports on Customer support, The business use case
network power quality Network operation, describes the system
Network and extension operator main processes
planning to retrieve, build, analyse
power quality data and
report on it for different
commitments.
Take into account power Customer support, New user is connected to
UC63222-B004
quality constraints in Network operation, the grid, which can meet
connecting a user to the Network and extension the power quality of load
grid planning and the grid.
Table 4 lists the business roles that have been identified so far in the business use cases
provided in Clause A.2. This list is not exhaustive.

Table 4 – Business roles of IEC TS 63222-1
Business roles Definition
System operator Party responsible for safe and reliable operation of a part of the electric power
system in a certain area and for connection to other parts of the electric power
system.
[SOURCE: IEC 60050-617:2009, 617-02-09]
Power quality complaints Party responsible for customer relationship and customer support on power quality
responsible issues on part of the electric power system in a certain area
Network operation Entity responsible for the planning, operation, maintenance, and the development
responsible in given areas of the electricity network
Grid user Party connected to the grid and consuming and/or producing electricity. Grid users
include consumers, producers, and prosumers
(Electricity) supplier Party having a contract to supply electric power and energy to a customer
[SOURCE: IEC 60050-617:2009, 617-02-08]
Conceding authority Authority that owns (a part of) the distribution grid and delegates its operation to a
distribution grid operator in a system where electricity distribution is operated as a
concession.
The conceding authority is usually a local authority or a municipality.
Authority that is responsible for preparing or adopting regulations.
[SOURCE: IEC 60050-901:2013, 901-03-11]
Regulator May be responsible for exercising autonomous authority over electricity markets
and the associated synchronous electricity grids.
Equivalent to regulatory authority.
Party connected to the grid and consuming and/or producing electricity. Grid users
include consumers, producers, and prosumers.
Grid user
Equivalent to party connected to the grid.

4.2 List of system use cases and system roles
Table 5 lists the system use cases which have been identified so far to enable the business
use cases described above to operate. The list is non-exhaustive and will be updated in future
editions of IEC TS 63222-1. It should also be noted that business as usual functions have not
been listed.
Table 5 – Lists of the system use cases
Index of the system use case Identified system use case Brief description
UC63222-S001 Monitor power quality on the This system use case describes the
network structure composition, general
workflow of power quality
monitoring, and functional
requirements of each layer system.
Measure power quality on a This system use case describes the
UC63222-S002
specific point of the network method for measurement and
interpretation of results for power
quality on a specific point of the
network.
UC63222-S003 Assess the emission limit related to This use case provides methods to
power quality technical parameters evaluate the emission limits for the
in power system installations and equipment. The
co-ordination approach in the use
case relies on individual emission
levels being derived from the power
quality level. It can be used as a
tool when evaluating the emission
limits for the installations and
equipment.
– 16 – IEC TS 63222-1:2021 © IEC 2021
Table 6 lists the system roles which have been identified so far. The list is non-exhaustive
and will be updated in future editions of IEC TS 63222-1.
Table 6 – Lists of system roles
System roles Description
Client Functional unit that requests and receives services from a server
[SOURCE: IEC 60050-732:2010, 732-01-13]
Monitoring terminal A functional unit that observes and records, for analysis, selected activities within a
switching system
[SOURCE: IEC 60050-714:1992, 714-18-28]
Master station The data station that has been designated by the control station to ensure data
transfer to one or more slave stations
[SOURCE: IEC 60050-721:1991, 721-19-12]

5 Provisions
5.1 Power quality assessment
5.1.1 General
Monitoring assessment and predicted assessment can be used for power quality assessment
of public power grid and users connected to the grid. The power quality assessment of power
supply connected to the grid can refer to monitoring assessment and predicted assessment.
The relationship between the power quality assessment and use cases is given in Figure 2.
The significant changes can be detected by the following conditions:
• data analytics being developed for automatic detection of changes from the permanent
measurements,
• customer complaints,
• operation mode adjustment information given by dispatching department,
• the access change information of customer given by the marketing department.

Figure 2 – Overview of the power quality management main functions
5.1.2 Monitoring assessment
The monitoring assessment should be used for the continuous monitoring of the existing grid.
In addition, monitoring assessment can be used for power quality assessment of the key
nodes in the network. It is also needed to analyse the actual power quality levels when
receiving the power quality complaining from users.
Measuring equipment is used for field test to obtain power quality testing data. Measurement
data is compared with the PQ characteristic value, judging whether it meets the standard
requirements, and evaluates voltage qualification rate and grade as required. The main
contents and requirements of power quality monitoring assessment report are listed in
Annex B.
5.1.3 Monitoring assessment process
1) Object and range determination
Determine the assessment object and range according to the source and purpose of the
assessment task.
2) System and equipment data collection
Collect the data of power system and equipment related to the assessment object,
determine the monitoring assessment points and limits or levels of PQ indicators.
3) Monitoring plan formulation
Analyse the operation mode, equipment working condition and characteristics of
production process of the assessment object, formulate monitoring plan.
4) Testing data obtaining
Select testing equipment, determine the appropriate measurement conditions,
measurement time and measurement value, obtain testing data. The measurement should
be carried out in the minimum (or smaller) operation modes of the power system and
under the normal working condition of the assessment object. The monitoring period
should include the maximum disturbance working period of the assessment object.

– 18 – IEC TS 63222-1:2021 © IEC 2021
5) Data analysis
Process and make statistics of testing data, compare results with the limits or levels of PQ
indicators, and analyse the respective PQ results of background or generated by users
according to the actual situation to get the assessment conclusion.
6) Put forward mitigation suggestions
If the assessment results exceed PQ limits, mitigation suggestions shall be put forward.
7) Provide report
Provide monitoring assessment report. See Annex C for the main contents of the
monitoring assessment report.
5.1.4 Predicted assessment
The predicted assessment shall be used for the power quality assessment of new construction,
reconstruction or expansion projects in the planning feasibility study stage.
According to the relevant load data and system parameters, modelling, simulation or analysis
of the assessment object is made to get power quality data. Assessment results are compared
with the limit value of PQ indicators to determine whether it meets the standard requirements.
The main contents and requirements of power quality predicted assessment report are listed
in Annex C.
5.1.5 Predicted assessment process
1) Object and range determination
Determine the assessment object and range according to the source and purpose of the
assessment task.
2) System and equipment data collection
Collect the data of power system and equipment related to the assessment object (if it is
unable to provide, refer to the same type of equipment), and determine the assessment
point and limits or levels of PQ indicators.
3) Assessment under prediction
According to the influence degree of the assessment object to the assessment indicator,
the predicted assessment method is used. During the assessment, the minimum (or
smaller) operation mode and maximum load level of the system in the year when the load
is put into operation and the year when the capacity is reached shall be considered.
4) Provide report
Provide predicted assessment report. See Annex C for the main contents of the predicted
assessment report.
5.1.6 Backgro
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