SIST-TP IEC/TR 62510:2009

SLOVENSKI STANDARD
SIST-TP IEC/TR 62510:2009
01-junij-2009
6WDQGDUGL]DFLMD]QDþLOQRVWLHOHNWULþQHHQHUJLMH
Standardising the characteristics of electricity
Ta slovenski standard je istoveten z: IEC/TR 62510
ICS:
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST-TP IEC/TR 62510:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP IEC/TR 62510:2009

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SIST-TP IEC/TR 62510:2009
IEC/TR 62510
Edition 1.0 2008-06
TECHNICAL
REPORT

Standardising the characteristics of electricity


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
K
ICS 29.020 ISBN 2-8318-9847-1

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

STANDARDISING THE CHARACTERISTICS OF ELECTRICITY


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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. However, a
technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example "state of the art".
IEC 62510, which is a technical report, has been prepared by IEC technical committee 8:
Systems aspects for electrical energy supply.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
8/1226/DTR 8/1248/RVC

Full information on the voting for the approval of this technical report can be found in the report
on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST-TP IEC/TR 62510:2009
TR 62510 © IEC:2008(E) – 3 –
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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INTRODUCTION
While standards exist in various countries for some of the characteristics of electricity supplied
from public networks, IEC 61000-2-1, 1990, EN 50160 and IEEE 1159 are attempts to cover all
of the characteristics more or less comprehensively. EN 50160 was a response to a formal
declaration that electricity is a product – according to European Directive 85/374/EEC
concerning liability for defective products.
The network operators have the responsibility of designing and operating the network with the
required level of quality which may be defined by national laws, national or international
standards.
The following text describes the nature of electricity and the relation between quality of supply
nd
and EMC. It is taken very largely from the EURELECTRIC PQ Report, 2 Edition.
Quality of supply
Of all the basic services on which modern society relies for support, electricity supply is one of
the most essential. In order to provide that support, several qualitative aspects are significant.
a) Constant availability is an important requirement, involving
• for continuity of supply in day-to-day terms, an operating regime whereby the inevitable
supply interruptions are prevented from being either unduly prolonged or unduly
frequent;
• for more long-term security of supply, a stable balance between user demand and the
availability of generation, transmission and distribution assets as well as energy
sources.
b) The utilisation of electricity requires both voltage and frequency to be standardised in order
that the supply as delivered to the user is co-ordinated with the equipment by which it is
utilised. It is very important to maintain the supply within reasonable range of the standard
values that are adopted for voltage and frequency.
c) Notwithstanding acceptably stable levels of voltage and frequency, there are several quite
short-term, low-amplitude or occasional irregularities superimposed on the voltage that can
hinder the proper functioning of electrical equipment within manufacturers installations or
on the electricity network itself.
NOTE There have been many different approaches to classifying the qualitative aspects of electricity supply,
complicated further by the current practice of separating the functions of generation, supply, network operation, etc.
For example, a recent report by the Council of European Electricity Regulators uses the following terms:
– commercial quality: concerning the business relationships between suppliers and users with respect to
how well the various services are delivered (The services concerned are not confined to network
operation);
– continuity of supply: concerning the extent to which customers find that their electricity supply is
interrupted for various reasons – see a) above;
– voltage quality: concerning the technical characteristics of the supply with respect to the voltage
delivered to customers, i.e. its magnitude and frequency, as in b) above, together with the potentially
disturbing aspects referred to in c) above.

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STANDARDISING THE CHARACTERISTICS OF ELECTRICITY



1 Scope
This technical report outlines the way in which electricity is now described as a product.
Particularly, in Europe and several other areas, for example Brazil and Argentina, as well as in
some states in the United States of America.
It is, however, rather a unique product because of its intangible and transient nature. Strictly, it
is a product that exists only for an instant at a given point of delivery, comes into existence at
the same instant at which it is being used and is replaced immediately by a new product with
rather different characteristics. Its characteristics are different at each separate point of
delivery. Moreover, it is a product whose quality depends not only on the elements that go into
its production, but also in the way in which it is being used at any instant by the equipment of
multiple users.
Therefore, the quality control that is possible for more tangible and concrete products is not
applicable in the case of electricity. All that can be attempted is some control of the conditions
under which it is produced, transmitted and distributed and those under which it is used. In
particular, the capacity of utilisation equipment to impinge on the quality of electricity, including
that delivered to other equipment, must be recognized.
Electrical equipment has become increasingly complex in terms of the functions it fulfils and
the way in which it interacts with other electrical equipment. Frequently, that interaction takes
place through the medium of the electricity network, which is the common energy source for all
the equipment. It arises because the network, intended to be a common energy source, also
provides a conducting path interlinking all equipment.
In effect, the electromagnetic phenomena arising from the behaviour of utilisation equipment
are superimposed on the other characteristics of the electricity supply, and become part of the
product that is delivered to the system user. They are joined also by phenomena arising from
atmospheric and other external events and from the intrinsic response of a large electricity
system to such events.
2 The power quality phenomena
Observation of normalized network impedance characteristics, such as proposed in IEC 60725
for 16 A and 75 A supplies, is essential so that electricity suppliers, distributors and system
users can share the power quality responsibility.
NOTE Normalized network impedances are not always applicable in many countries, because the particular
network configuration makes the power quality management easier and more reasonable by using other methods
rather than normalized network impedances.
The degree of economic development has a great influence on the importance attached to the
different elements of supply quality. At an earlier stage of development, the primary concerns
are likely to be that electricity is actually available and, when available, that the voltage and
frequency are within reasonable range of their nominal values for most of the time. When these
are the primary concerns, such matters as voltage dips, transients, etc. are seen as having
minor relevance. With more advanced economic development, however, continuity, voltage and
frequency, while remaining important, begin to be taken for granted, and the emphasis shifts to
the set of phenomena encompassed by the modern term, “power quality”. These phenomena
are briefly described below.

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Harmonics, interharmonics and frequencies in the range of 2 kHz to 9 kHz: these arise
mainly from system users’ equipment that draws a current not linearly related to the voltage,
thereby injecting currents at unwanted frequencies into the supply network.
Flicker, as a main effect of voltage fluctuations, which are caused by system users’
equipment drawing current of fluctuating magnitude, resulting in corresponding fluctuation of
the voltage on the network.
Short duration RMS variation (instantaneous, momentary, and temporarily): these are
caused by the sudden occurrence and termination of short circuits, motor starts or other
current increase on the supply system or installations connected to it.
Transient overvoltages (Impulsive and oscillatory): several phenomena, including the
operation of switches and fuses and the occurrence of lightning strokes in proximity to the
supply networks, give rise to transient overvoltages in distribution networks and in the
installations connected to them.
Temporary power frequency overvoltages and undervoltages (long duration RMS
variations): depending on the utilities practices, temporary power frequency overvoltages
between live conductors and earth occur often as a consequence of a neutral conductor
interruption. A temporary power frequency overvoltage may also appear during an earth fault in
the public distribution system or in a customer’s installation and disappear
...