SIST EN 61000-4-7:2003/A1:2009
Electromagnetic compatibility (EMC) -- Part 4-7: Testing and measurement techniques - General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto
Electromagnetic compatibility (EMC) -- Part 4-7: Testing and measurement techniques - General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto
Elektromagnetische Verträglichkeit (EMV) -- Teil 4-7: Prüf- und Messverfahren - Allgemeiner Leitfaden für Verfahren und Geräte zur Messung von Oberschwingungen und Zwischenharmonischen in Stromversorgungsnetzen und angeschlossenen Geräten
Compatibilité électromagnétique (CEM) -- Partie 4-7: Techniques d'essai et de mesure - Guide général relatif aux mesures d'harmoniques et d'interharmoniques, ainsi qu'à l'appareillage de mesure, applicable aux réseaux d'alimentation et aux appareils qui y sont raccordés
Elektromagnetna združljivost (EMC) - 4-7. del: Preskusne in merilne tehnike - Splošno vodilo za meritve in merilno opremo za merjenje harmonikov in medharmonikov v napajalnih omrežjih in nanje priključeno opremo (IEC 61000-4-7:2002/A1:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61000-4-7:2003/A1:2009
01-september-2009
(OHNWURPDJQHWQD]GUXåOMLYRVW (0& GHO 3UHVNXVQHLQPHULOQHWHKQLNH
6SORãQRYRGLOR]DPHULWYHLQPHULOQRRSUHPR]DPHUMHQMHKDUPRQLNRYLQ
PHGKDUPRQLNRYYQDSDMDOQLKRPUHåMLKLQQDQMHSULNOMXþHQRRSUHPR ,(&
$
Electromagnetic compatibility (EMC) -- Part 4-7: Testing and measurement techniques -
General guide on harmonics and interharmonics measurements and instrumentation, for
power supply systems and equipment connected thereto
Elektromagnetische Verträglichkeit (EMV) -- Teil 4-7: Prüf- und Messverfahren -
Allgemeiner Leitfaden für Verfahren und Geräte zur Messung von Oberschwingungen
und Zwischenharmonischen in Stromversorgungsnetzen und angeschlossenen Geräten
Compatibilité électromagnétique (CEM) -- Partie 4-7: Techniques d'essai et de mesure -
Guide général relatif aux mesures d'harmoniques et d'interharmoniques, ainsi qu'à
l'appareillage de mesure, applicable aux réseaux d'alimentation et aux appareils qui y
sont raccordés
Ta slovenski standard je istoveten z: EN 61000-4-7:2002/A1:2009
ICS:
33.100.20 Imunost Immunity
SIST EN 61000-4-7:2003/A1:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 61000-4-7:2003/A1:2009
---------------------- Page: 2 ----------------------
SIST EN 61000-4-7:2003/A1:2009
EUROPEAN STANDARD
EN 61000-4-7/A1
NORME EUROPÉENNE
March 2009
EUROPÄISCHE NORM
ICS 33.100.10; 33.100.20
English version
Electromagnetic compatibility (EMC) -
Part 4-7: Testing and measurement techniques -
General guide on harmonics and interharmonics measurements
and instrumentation,
for power supply systems and equipment connected thereto
(IEC 61000-4-7:2002/A1:2008)
Compatibilité électromagnétique (CEM) - Elektromagnetische Verträglichkeit (EMV) -
Partie 4-7: Techniques d'essai Teil 4-7: Prüf- und Messverfahren -
et de mesure - Allgemeiner Leitfaden für Verfahren
Guide général relatif aux mesures und Geräte zur Messung
d'harmoniques et d'interharmoniques, von Oberschwingungen
ainsi qu'à l'appareillage de mesure, und Zwischenharmonischen
applicable aux réseaux d'alimentation in Stromversorgungsnetzen
et aux appareils qui y sont raccordés und angeschlossenen Geräten
(CEI 61000-4-7:2002/A1:2008) (IEC 61000-4-7:2002/A1:2008)
This amendment A1 modifies the European Standard EN 61000-4-7:2002; it was approved by CENELEC on
2009-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: avenue Marnix 17, B - 1000 Brussels
© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61000-4-7:2002/A1:2009 E
---------------------- Page: 3 ----------------------
SIST EN 61000-4-7:2003/A1:2009
EN 61000-4-7:2002/A1:2009 - 2 -
Foreword
The text of document 77A/645/FDIS, future amendment 1 to IEC 61000-4-7:2002, prepared by SC 77A,
Low frequency phenomena, of IEC TC 77, Electromagnetic compatibility, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 to EN 61000-4-7:2002
on 2009-03-01.
The following dates were fixed:
– latest date by which the amendment has to be
implemented at national level by publication of
an identical national standard or by endorsement (dop) 2009-12-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2012-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of amendment 1:2008 to the International Standard IEC 61000-4-7:2002 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________
---------------------- Page: 4 ----------------------
SIST EN 61000-4-7:2003/A1:2009
- 3 - EN 61000-4-7:2002/A1:2009
Replace Annex ZA of EN 61000-4-7:2002 by:
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1) 2) 3)
IEC 60038 - IEC standard voltages HD 472 S1 1989
+ corr. February 2002
A1 1995
1)
IEC 60050-161 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 161: Electromagnetic compatibility
1) 3)
IEC 61000-2-2 - Electromagnetic compatibility (EMC) - EN 61000-2-2 2002
Part 2-2: Environment - Compatibility levels
for low-frequency conducted disturbances and
signalling in public low-voltage power supply
systems
1) 3)
IEC 61000-3-2 - Electromagnetic compatibility (EMC) - EN 61000-3-2 2006
Part 3-2: Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A per
phase)
1) 3)
IEC 61000-3-12 - Electromagnetic compatibility (EMC) - EN 61000-3-12 2005
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
1)
Undated reference.
2)
The title of HD 472 S1 is: Nominal voltages for low-voltage public electricity supply systems.
3)
Valid edition at date of issue.
---------------------- Page: 5 ----------------------
SIST EN 61000-4-7:2003/A1:2009
---------------------- Page: 6 ----------------------
SIST EN 61000-4-7:2003/A1:2009
IEC 61000-4-7
Edition 2.0 2008-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Electromagnetic compatibility (EMC) –
Part 4-7: Testing and measurement techniques – General guide on harmonics
and interharmonics measurements and instrumentation, for power supply
systems and equipment connected thereto
Compatibilité électromagnétique (CEM) –
Partie 4-7: Techniques d'essai et de mesure – Guide général relatif aux mesures
d'harmoniques et d'interharmoniques, ainsi qu'à l'appareillage de mesure,
applicable aux réseaux d'alimentation et aux appareils qui y sont raccordés
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
T
CODE PRIX
ICS 33.100.10; 33.100.20 ISBN 2-8318-9848-X
---------------------- Page: 7 ----------------------
SIST EN 61000-4-7:2003/A1:2009
– 2 – 61000-4-7 Amend. 1 © IEC:2008
FOREWORD
This amendment has been prepared by subcommittee 77A: Low frequency phenomena, of
IEC technical committee 77: Electromagnetic compatibility.
The text of this amendment is based on the following documents:
FDIS Report on voting
77A/645/FDIS 77A/651/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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.
_____________
Page 13
2 Normative references
Insert, in the existing list, the following standards:
IEC 60038, IEC standard voltages
IEC 61000-2-2, Electromagnetic compatibility (EMC) – Part 2-2: Environment – Compatibility
levels for low-frequency conducted disturbances and signalling in public low-voltage power
supply systems
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
Delete from the existing list the following standard:
IEC 61967-1, Integrated circuits – Measurement of electromagnetic emissions, 150 kHz to
1 GHz – Part 1: Measurement conditions and definitions
Pages 15 and 17
3.1 Definitions related to frequency analysis
Replace the entire subclause, including the NOTES, by the following new text:
Notations: The following notations are used in the present guide for the Fourier series
development because it is easier to measure phase angles by observations of the zero
crossings:
---------------------- Page: 8 ----------------------
SIST EN 61000-4-7:2003/A1:2009
61000-4-7 Amend. 1 © IEC:2008 – 3 –
∞
k
⎛ ⎞
()
f t = c + c sin⎜ ω t + ϕ ⎟ (1)
0 ∑ k 1 k
N
⎝ ⎠
k =1
⎧
2 2
c = b + ja = a + b
k k k
⎪ k k
⎪
c
k
⎪
Y =
C,k
⎪
2
⎪
⎛ a ⎞ ⎛ a ⎞
⎪
k k
⎜ ⎟ ⎜ ⎟
ϕ =π + arctan if b < 0 ϕ = arctan if b > 0
k k k k
⎪ ⎟
⎜ ⎟ ⎜
b b
⎝ k ⎠ ⎝ k⎠
⎪
⎨
with: (2)
π π
⎪
ϕ = if b = 0 and a > 0 ϕ = − if b = 0 and a < 0
k k k k k k
2 2
⎪
⎪
ϕ = 0 if b ≤ ε and a ≤ ε,
k k k
⎪
⎪
with ε = 0,05 % U and ε = 0,15 % I
nom nom
⎪
or ε = 0,15 % U and ε = 0,5 % I
⎪ nom nom
⎪
respectively, see table 1 in IEC 61000-4-7
⎩
T
⎧
N
2 ⎛ k ⎞
⎪
b = f()t × sin ω t dt
⎜ ⎟
k 1
∫
⎪
T N
⎝ ⎠
N
⎪ 0
⎪
T
N
⎪
2 k
⎛ ⎞
a = f()t × cos ω t dt
⎜ ⎟
⎨
and: k 1 (3)
∫
T N
⎝ ⎠
N
⎪
0
⎪
T
N
⎪
1
⎪
c = f()t dt
0
∫
⎪ T
N
0
⎩
NOTE 1 The above definition setting φ to zero for the cases where b and a have very small values provides
k k k
guidance to instrument manufacturers, as phase measurements of very small amplitudes may result in very large
deviations, hence there is no requirement to measure phase for such small signals.
ω is the angular frequency of the fundamental (ω = 2πf );
1 1 H,1
T is the width (or duration) of the time window; the time window is that time span of a time
N
function over which the Fourier transform is performed;
c is the d.c. component;
0
k
c is the amplitude of the component with frequency f = f ;
k C,k H,1
N
Y is the r.m.s. value of component c ;
C,k k
f is the fundamental frequency of the power system;
H,1
k is the ordinal number (order of the spectral component) related to the frequency resolution
⎛ ⎞
1
f = ;
⎜ ⎟
C,1
T
N
⎝ ⎠
N is the number of fundamental periods within the window width;
ϕ is the phase angle of spectral line k.
k
---------------------- Page: 9 ----------------------
SIST EN 61000-4-7:2003/A1:2009
– 4 – 61000-4-7 Amend. 1 © IEC:2008
NOTE 2 Strictly speaking these definitions apply to steady-state signals only. The Fourier series is actually in
most cases performed digitally, i.e. as a Discrete Fourier Transform DFT, or a variant thereof, being the FFT.
The analogue signal f(t) which has to be analyzed is sampled, A/D-converted and stored. Each group of M samples
forms a time window on which DFT is performed. According to the principles of Fourier series expansion, the
window width T determines the frequency resolution f = 1/T (i.e. the frequency separation of the spectral
N C,1 N
components) for the analysis. Therefore the window width T must be an integer multiple N of the fundamental
N
period T of the system voltage: T = N × T . The sampling rate is in this case f = M/(NT ) (where M = number of
1
1 s
1 N
samples within T ).
N
Before DFT-processing, the samples in the time window are often weighted by multiplying them with a special
symmetrical function ('windowing function'). However, for periodic signals and synchronous sampling it is
preferable to use a rectangular weighting window which multiplies each sample by unity.
The DFT-processor yields the orthogonal Fourier-coefficients a and b of the corresponding spectral-component
k k
frequencies f = k/T , k = 0, 1, 2 . M-1. However, only k values up to and including half of the maximum value are
C,k N
useful, the other half just duplicates them.
Under synchronized conditions, the component of harmonic order h related to the fundamental frequency f
H,1
appears as the spectral component of order k, where k = hN.
NOTE 3 The Fast Fourier Transform FFT is a special algorithm allowing short computation times. It requires that
i
the number of samples M be an integer power of 2, M = 2 , with i ≥ 10 for example.
NOTE 4 The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages. Index C
qualifies the variable as spectral component.
Page 17
3.2 Definitions related to harmonics
Replace the existing terms and definitions 3.2.1 to 3.2.5, including NOTES, if any, by the
following:
3.2.1
harmonic frequency
f
H,h
frequency which is an integer multiple of the fundamental frequency of the power system
(f = h × f )
H,h H,1
NOTE The harmonic frequency f is identical with the component frequency f with k = h × N.
H,h C,k
3.2.2
harmonic order
h
(integer) ratio of a harmonic frequency to the fundamental frequency of the power system. In
connection with the analysis using DFT and synchronisation between f and f (sampling
H,1 s
rate), the harmonic order h corresponds to the spectral component k = h × N (k = number of
the spectral component, N = number of periods of the fundamental frequency in time window
T )
N
3.2.3
r.m.s. value of a harmonic component
Y
H,h
r.m.s. value of one of the components having a harmonic frequency in the analysis of a non-
sinusoidal waveform
For brevity, such a component may be referred to simply as a “harmonic”
NOTE 1 The harmonic component Y is identical with the spectral component Y with k = h×N;
H,h C,k
(Y = Y ). The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages.
H,h C,h×N
The index H qualifies the variable I or U as harmonic.
NOTE 2 For the purposes of this standard, the time window has a width of N = 10 (50 Hz systems) or N = 12
(60 Hz system) fundamental periods, i.e. approximately 200 ms (see 4.4.1). This yields Y = Y (50 Hz
H,h C,10×h
systems) and Y = Y (60 Hz systems).
H,h C,12×h
---------------------- Page: 10 ----------------------
SIST EN 61000-4-7:2003/A1:2009
61000-4-7 Amend. 1 © IEC:2008 – 5 –
Page 19
3.2.4
r.m.s. value of a harmonic group
Y
g,h
square root of the sum of the squares of the r.m.s. value of a harmonic and the spectral
components adjacent to it within the time window, thus summing the energy contents of the
neighbouring components with that of the harmonic proper. See also equation 8 and Figure 4.
The harmonic order is given by the harmonic considered.
NOTE The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages.
3.2.5
r.m.s. value of a harmonic subgroup
Y
sg,h
square root of the sum of the squares of the r.m.s. value of a harmonic and the two spectral
components immediately adjacent to it. For the purpose of including the effect of voltage
fluctuation during voltage surveys, a subgroup of output components of the DFT is obtained
by summing the energy contents of the frequency components directly adjacent to a harmonic
with that of the harmonic proper. (See also equation 9 and Figure 6.) The harmonic order is
given by the harmonic considered
NOTE The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages.
Page 19
3.3 Definitions related to distortion factors
Replace the existing terms and definitions 3.3.1 to 3.3.4, including NOTES, if any, by the
following:
3.3.1
total harmonic distortion
THD
THD (symbol)
Y
ratio of the r.m.s. value of the sum of all the harmonic components ( Y ) up to a specified
H,h
order (h ) to the r.m.s. value of the fundamental component (Y ):
max H,1
2
h
max
⎛ ⎞
Y
H,h
⎜ ⎟
THD = (4)
Y ∑
⎜ ⎟
Y
⎝ ⎠
H,1
h=2
NOTE 1 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
NOTE 2 The value of h is 40 if no other value is defined in a standard concerned with limits (IEC 61000-3
max
series).
3.3.2
group total harmonic distortion
THDG
THDG (symbol)
Y
ratio of the r.m.s. value of the harmonic groups (Y ) to the r.m.s. value of the group
g,h
associated with the fundamental (Y ):
g,1
2
h
max
⎛ ⎞
Y
g,h
⎜ ⎟
THDG = where h ≥ 2 (5)
Y ∑ min
⎟
⎜
Y
⎝ g,1⎠
h=h
min
NOTE 1 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
NOTE 2 The value of h is 2 and that of h is 40 if no other values are defined in a standard concerned with limits (for example
min max
IEC 61000-3 series).
---------------------- Page: 11 ----------------------
SIST EN 61000-4-7:2003/A1:2009
– 6 – 61000-4-7 Amend. 1 © IEC:2008
Page 21
3.3.3
THDS
subgroup total harmonic distortion
THDS (symbol)
Y
ratio of the r.m.s. value of the harmonic sub-groups (Y ) to the r.m.s. value of the sub-group
sg,h
associated with the fundamental (Y ):
sg,1
2
h
max
⎛ ⎞
Y
sg,h
⎜ ⎟
THDS = where h ≥ 2 (6)
Y ∑
min
⎜ ⎟
Y
⎝ sg,1⎠
h=h
min
NOTE 1 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
NOTE 2 The value of h is 2 and that of h is 40 if no other values are defined in a standard concerned with
min max
limits (for example IEC 61000-3 series).
3.3.4
partial weighted harmonic distortion
PWHD
PWHD (symbol)
H,Y
ratio of the r.m.s. value, weighted with the harmonic order h, of a selected group of higher
order harmonics (from the order h to h ) to the r.m.s. value of the fundamental:
min max
2
h
max
⎛ ⎞
Y
H,h
⎜ ⎟
PWHD = h (7)
Y
H, ∑
⎜ ⎟
Y
H,1
⎝ ⎠
h=h
min
NOTE 1 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
NOTE 2 The concept of partial weighted harmonic distortion is introduced to allow for the possibility of specifying
a single limit for the aggregation of higher order harmonic components. The partial weighted group harmonic
distortion PWHD can be evaluated by replacing the quantity Y by the quantity Y . The partial weighted sub-
g Y H,h g,h
,
group harmonic distortion PWHD can be evaluated by replacing the quantity Y by the quantity Y . The type of
sg,Y H,h sg,h
PWHD (PWHD , PWHD or PWHD ) is defined in each standard which uses the PWHD, for example in standards concerned
H,Y g,Y sg,Y
with limits (IEC 61000-3 series).
NOTE 3 The values of h and h are defined in each standard which uses the PWHD , for example in a standard
min max
Y
concerned with limits (IEC 61000-3 series).
Page 21
3.4 Definitions related to interharmonics
Replace the existing terms and definitions 3.4.1 to 3.4.5, including NOTES, if any, by the
following:
3.4.1
r.m.s. value of a spectral component
Y
C,k
in the analysis of a waveform, the r.m.s. value of a component whose frequency is a multiple
of the inverse of the duration of the time window
NOTE 1 If the duration of the time window is multiple of the fundamental period, only some of the spectral
components have frequencies which are integer multiples of the fundamental frequency.
NOTE 2 The frequency interval between two consecutive spectral components is the inverse of the width of the
time window, approximately 5 Hz for the purposes of this standard.
NOTE 3 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
---------------------- Page: 12 ----------------------
SIST EN 61000-4-7:2003/A1:2009
61000-4-7 Amend. 1 © IEC:2008 – 7 –
3.4.2
r.m.s. value of an interharmonic component
Y
C,i
r.m.s. value of a spectral component, Y , with a frequency between two consecutive
C,k ≠ h × N
harmonic frequencies (see Figure 4). For brevity, such a component may be referred to simply
as an “interharmonic”.
NOTE 1 The frequency of the interharmonic component is given by the frequency of the spectral line. This
frequency is not an integer multiple of the fundamental frequency.
NOTE 2 A difference is made between an “interharmonic component” produced as a physical component by an
equipment, for example at 183,333 Hz, and a “spectral component” calculated by the instrument as the result of the
waveform analysis e.g. for a 50 Hz system at 185 Hz (the frequency of the FFT bin). The “spectral component” is
also the “harmonic component” for h × N where h is an integer.
Page 23
3.4.3
r.m.s. value of an interharmonic group
Y
ig,h
r.m.s. value of all spectral components in the interval between two consecutive harmonic
frequencies (see Figure 4).
NOTE 1 For the purpose of this standard, the r.m.s. value of the interharmonic group between the harmonic
orders h and h + 1 is designated as Y , for example the group between h = 5 and h = 6 is designated as Y .
ig,h ig,5
NOTE 2 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
3.4.4
r.m.s. value of an interharmonic centred subgroup
Y
isg,h
r.m.s. value of all spectral components in the interval between two consecutive harmonic
frequencies, excluding spectral components directly adjacent to the harmonic frequencies
(see Figure 6)
NOTE 1 For the purpose of this standard, the r.m.s. value of the centred subgroup between the harmonic orders h
and h + 1 is designated as Y , for example the centred subgroup between h = 5 and h = 6 is designated as Y .
isg,h isg,5
NOTE 2 The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
3.4.5
interharmonic group frequency
f
ig,h
mean of the two harmonic frequencies between which the group is situated, i.e. f = (f +
ig,h H,h
f )/2.
H,h+1
Add the following new term and definition:
3.4.6
interharmonic centred subgroup frequency
f
isg,h
mean of the two harmonic frequencies between which the subgroup is situated, i.e. f =
isg,h
(f + f )/2.
H,h H,h+1
Pages 23 and 25
3.5 Notations
Replace the entire subclause by the following new subclause:
3.5.1 Symbols
In this standard, voltage and current values are r.m.s. unless otherwise stated.
a amplitude coefficient of a cosine component in a Fourier series
b amplitude coefficient of a sine component in a Fourier series
---------------------- Page: 13 ----------------------
SIST EN 61000-4-7:2003/A1:2009
– 8 – 61000-4-7 Amend. 1 © IEC:2008
c amplitude coefficient in a Fourier series
f frequency; function
f
C,k spectral component frequency of order k
f the frequency of the spectral component of order 1. The frequency resolution is equal to this
C,1
frequency
f
g,h harmonic-group frequency of order h
f
sg,h harmonic-subgroup frequency of order h
f
ig,h interharmonic-group frequency of order h
f
isg,h interharmonic centred subgroup frequency of order h
f
H,h harmonic component frequency of order h
f
H,1 fundamental frequency of the power system
f sampling rate
s
h the order of the highest harmonic that is taken into account
max
h the order of the lowest harmonic that is taken into account
min
j −1
t running time
B bandwidth
I current (r.m.s. value)
M integer number; number of samples within the window width
N number of power supply periods within the window width
P power
T time interval
T fundamental period of the power supply system
1
T window width comprising N fundamental periods
N
U voltage (r.m.s. value)
Y Variable replaceable by I, U
Y r.m.s. value of the spectral component of order k
C,k
Y r.m.s. value of harmonic group
g,h
Y r.m.s. value of the harmonic component of order h
H,h
Y r.m.s. value of interharmonic group
ig,h
Y r.m.s. value of interharmonic centred subgroup
isg,h
Y r.m.s. value of harmonic subgroup
sg,h
ω angular frequency
ω angular frequency of the power supply
1
ϕ phase angle
Page 25
Replace the entire subclause by the following new subclause:
3.5.2 Subscripts
b centre-band frequency
h running-integer number for harmonic orders
k running-integer number for spectral components
m measured value
---------------------- Page: 14 ----------------------
SIST EN 61000-4-7:2003/A1:2009
61000-4-7 Amend. 1 © IEC:2008 – 9 –
max maximum value
min minimum value
o smoothed value
g grouped value
sg sub-grouped value
i interharmonic value
g,h harmonic group associated with harmonic order h
sg,h harmonic subgroup associated with harmonic order h
ig,h interharmonic group above harmonic order h
isg,h interharmonic centred sub-group above harmonic order h
og,h smoothed harmonic group of order h
nom nominal value
s sampled
C value related to spectral component
H harmonic
f frequency
0 d.c. related
Page 25
4.1 Characteristics of the signal to be measured
Replace the existing text of this subclause by the following new text:
Instruments for the following types of measurement are considered:
a) harmonic emission measurement,
b) interharmonic emission measurement,
c) measurements above harmonic frequency range up to 9 kHz.
Strictly speaking the (Fast) Fourier Transform produces accurate results for steady state
signals only. Signals whose amplitudes vary with time cannot be described correctly by their
harmonic components only. In order to obtain reproducible harmonic emission analysis results
when measuring products with fluctuating power, and thus fluctuating fundamental current
and possibly fluctuating harmonic current levels, a combination of averaging techniques and
sufficiently long measurement cycles can be used. This standard therefore provides a
simplified method employing specific averaging methods (see 5.5.1). Furthermore, a test
observation period, long enough to obtain successive measurement results that are within
acceptable tolerance levels is specified in the harmonic emission standards referring to this
standard.
Page 27
4.4.1 Main instrument
Replace, in the fourth dashed item of the first paragraph:
"a " by "a " and "b " by "b "
m k m k
Replace, the entire third paragraph (paragraph below Note 2) by the following new text:
The window width shall be 10 (50 Hz systems) or 12 (60 Hz systems) fundamental periods (T
N
= [10 or 12] × T ≈ 200ms) with rectangular weighting, synchronized to the fundamental
1
frequency of the power system. Hanning weighting is allowed only in the case of loss of
synchronisation. The loss of synchronization shall be indicated on the instrument display and
---------------------- Page: 15 ----------------------
SIST EN 61000-4-7:2003/A1:2009
– 10 – 61000-4-7 Amend. 1 © IEC:2008
the data so acquired shall be flagged and shall not be used for the purpose of determining
compliance, but may be used for other purposes.
Replace the fifth paragraph (last paragraph before Figure 1) by the following new text:
The output OUT 1 (see Figure 1) shall provide the individual coefficients a and b of the DFT
k k
as well as Y , for the current or voltage, i.e. the value of each frequency component
C,k
calculated.
Page 29
Figure 1 – General structure of the measuring instrument
Replace the existing figure by the following new figure:
Sampling
frequency
generation
Input
Preprocessing
voltage
Sampling &
Main instrument
DFT OUT 1 (a , b , Y )
k k C,k
Conversion
Input
Preprocessing
current
Grouping
Input for Active Power
see notes 3 and 4
OUT 2a (Y )
g,h
Smoothing
OUT 2b (Y )
og,h
Check for
Compliance
OUT 3 (pass or fail)
IEC 858/08
Page 33
5.3 Accuracy requirements
Table 1 – Accuracy requirements for current, voltage and power measurements
Replace, in the last column, in the third row of Class I:
"P " by "P ".
nom m
Replace in the existing third explanatory note by the following:
U and I : Measured values by U , I and P : Measured values.
m m m m m
---------------------- Page: 16 ----------------------
SIST EN 61000-4-7:2003/A1:2009
61000-4-7 Amend. 1 © IEC:2008 – 11 –
Replace the existing NOTE 2 by the following new NOTE:
NOTE 2 Class I instruments are recommended for emission measurements, Class II is recommended for general
surveys, but can also be used for emission measurements if the values are such that, even allowing for the
increased uncertainty, it is clear that the limits are not exceeded. In practice, this means that the measured values
of harmonics should be <90 % of the allowed limits.
Replace the existing NOTE 3 by the following new NOTE:
NOTE 3 Additionally, for Class I instruments, the phase shift between individual channels should be smaller than
h × 1º.
Pages 35 and 37
5.4 Measurement set-up for emission assessment
Replace the title and the entire text and figures of this subclause by the following new titles,
figures and text:
5.4 Measurement set-up and supply voltage
5.4.1 Measurement set-up for emission assessment
The measurement set-up is given in Figures 2 and 3.
Key
Δ
U L
U Source voltage l
...
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]DQDSDMDOQHVLVWHPHLQQDQMHSULNOMXþHQRRSUHPR $&'9
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---------------------- Page: 1 ----------------------
77A/562/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJET DE COMITÉ POUR VOTE (CDV)
Project number IEC 61000-4-7 A1 Ed.2
Numéro de projet
IEC/TC or SC:
Secretariat / Secrétariat
77A
CEI/CE ou SC:
France
Submitted for parallel voting in Date of circulation Closing date for voting (Voting
CENELEC Date de diffusion mandatory for P-members)
Date de clôture du vote (Vote
2006-12-22
obligatoire pour les membres (P))
Soumis au vote parallèle au
CENELEC 2007-05-25
Also of interest to the following committees Supersedes document
Intéresse également les comités suivants Remplace le document
77A/527/CD, 77A/550/CC
Functions concerned
Fonctions concernées
Safety EMC Environment Quality assurance
Sécurité
CEM Environnement Assurance qualité
CE DOCUMENT EST TOUJOURS À L'ÉTUDE ET SUSCEPTIBLE DE THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT
MODIFICATION. IL NE PEUT SERVIR DE RÉFÉRENCE. SHOULD NOT BE USED FOR REFERENCE PURPOSES.
LES RÉCIPIENDAIRES DU PRÉSENT DOCUMENT SONT INVITÉS À RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR
PRÉSENTER, AVEC LEURS OBSERVATIONS, LA NOTIFICATION DES COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF
DROITS DE PROPRIÉTÉ DONT ILS AURAIENT ÉVENTUELLEMENT WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING
CONNAISSANCE ET À FOURNIR UNE DOCUMENTATION EXPLICATIVE. DOCUMENTATION.
Titre : Amendement à la CEI 61000-4-7 : Title : Amendment to IEC 61000-4-7 Ed.2:
Compatibilité électromagnétique (CEM) – Electromagnetic compatibility (EMC) : Testing
Techniques d’essai et de mesures – Guide and measurement techniques - General guide on
général relatif aux mesures d’harmoniques et harmonics and interharmonics measurements
d’interharmoniques, ainsi qu’à l’appareillage de and instrumentation, for power supply systems
mesure, applicable aux réseaux d’alimentation and equipment connected thereto
et aux appareils qui y sont raccordés
Note d'introduction Introductory note
The French version will be circulated later
ATTENTION ATTENTION
VOTE PARALLÈLE IEC – CENELEC
CEI – CENELEC PARALLEL VOTING
L’attention des Comités nationaux de la CEI, membres du The attention of IEC National Committees, members of
CENELEC, est attirée sur le fait que ce projet de comité CENELEC, is drawn to the fact that this Committee Draft for
pour vote (CDV) de Norme internationale est soumis au Vote (CDV) for an International Standard is submitted for
vote parallèle. parallel voting.
Un bulletin de vote séparé pour le vote CENELEC leur sera A separate form for CENELEC voting will be sent to them by
envoyé par le Secrétariat Central du CENELEC. the CENELEC Central Secretariat.
Copyright © 2006 International Electrotechnical Commission, IEC. All rights reserved. It is
permitted to download this electronic file, to make a copy and to print out the content for the sole
purpose of preparing National Committee positions. You may not copy or "mirror" the file or
printed version of the document, or any part of it, for any other purpose without permission in
writing from IEC.
FORM CDV (IEC) 2005-09-23
---------------------- Page: 2 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 2 –
1 FOREWORD
2 This amendment has been prepared by subcommittee 77A: Low Frequency Phenomena,
3 of IEC technical committee 77: Electromagnetic Compatibility.
4 The text of this amendment is based on the following documents:
FDIS Report on voting
77A/XX/FDIS //A/XX/RVD
5
6 Full information on the voting for the approval of this amendment can be found in the
7 report on voting indicated in the above table.
8 The committee has decided that the contents of this amendment and the base publication
)
1
9 will remain unchanged until the maintenance result date indicated on the IEC web site
10 under "http://webstore.iec.ch" in the data related to the specific publication. At this date,
11 the publication will be
12 • reconfirmed,
13 • withdrawn,
14 • replaced by a revised edition, or
15 • amended.
16 _____________
)
1
The National Committees are requested to note that for this publication the maintenance result date is
2010
---------------------- Page: 3 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 3 –
17 Page 15 and 17
18 Replace 3.1, by
19 Notations: The following notations are used in the present guide for the Fourier series
20 development because it is easier to measure phase angles by observations of the zero
21 crossings:
22
∞
k
⎛⎞
23 ft() c c sin ωt ϕ (1)
=+ +
0k∑ 1 k
⎜⎟
N
⎝⎠
k1=
24 In 3.1, replace equation system (2) by
22
⎧
cb=+ja= a+b
kk k k k
⎪
c
⎪
k
Y =
C,k
⎪
2
⎪
⎪ ⎛⎞ ⎛⎞
aa
kk
ϕπ=+ arctan if bb< 0 ϕ = arctan if > 0
kk⎜⎟ k ⎜⎟ k
⎪
bb
kk
⎝⎠ ⎝⎠
⎪
25 with: (2)
⎨
ππ
ϕϕ== if ba0 and > 0 =− if ba= 0 and < 0
⎪
kk k k k k
22
⎪
⎪ϕε=≤0 if ba < and ε,
kk ε
⎪
with εε = 0,05% U and = 0,15% I
nom nom
⎪
⎪
or εε = 0,15% UI and = 0,5%
nom nom
⎪
respectively, see Table 1 in 61000-4-7 Ed.2
⎩
26 In 3.1, replace equation system (3) by
T
N
⎧
2k
⎛⎞
bf=×()t sin ωtdt
⎪
k1⎜⎟
∫
TN
⎝⎠
N
⎪ 0
T
⎪
N
2k
⎪ ⎛⎞
27 and: (3)
af=×()t cos ωtdt
⎨
k1⎜⎟
∫
TN
⎝⎠
N 0
⎪
T
⎪
N
1
⎪
cf= ()tdt
0
∫
⎪ T
N 0
⎩
28
29 and replace the list of symbols below equation (3) by:
30 ω is the angular frequency of the fundamental (ωπ= 2 f );
1
1H,1
31 T is the width (or duration) of the time window; the time window is that time span of a
N
32 time function over which the Fourier transform is performed;
33 c is the d.c. component;
0
k
34 c is the amplitude of the component with frequency f = f ;
k
C,k H,1
N
---------------------- Page: 4 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 4 –
35 Y r.m.s. value of c ;
C,k k
36
37 f is the fundamental frequency of the power system;
H,1
38 k is the ordinal number (order of the spectral component) related to the frequency resolution
⎛⎞
1
39 f = .
⎜⎟
C,1
T
⎝⎠N
40 N is the number of fundamental periods within the window width;
41 ϕ phase angle of spectral line k
k
42
43 NOTE 1 - Strictly speaking these definitions apply to steady-state signals only. The Fourier series is actually
44 in most cases performed digitally, i.e. as a Discrete Fourier Transform DFT, or a variant thereof, being the
45 FFT.
46 The analogue signal f(t) which has to be analyzed is sampled, A/D-converted and stored. Each group of M
47 samples forms a time window on which DFT is performed. According to the principles of Fourier series
48 expansion, the window width T determines the frequency resolution f = 1/T (i.e. the frequency separation
N C,1 N
49 of the spectral components) for the analysis. Therefore the window width T must be an integer multiple N of
N
50 the fundamental period T of the system voltage: T = N × T . The sampling rate is in this case f = M/(NT )
1 N 1 s 1
51 (where M = Number of samples within T ).
N
52 Before DFT-processing, the samples in the time window are often weighted by multiplying them with a special
53 symmetrical function ('windowing function'). However, for periodic signals and synchronous sampling it is
54 preferable to use a rectangular weighting window which multiplies each sample by unity.
55 The DFT-processor yields the orthogonal Fourier-coefficients a and b of the corresponding spectral-
k k
56 component frequencies f = k/T , k= 0, 1, 2.M-1. However, only k values up to half of the maximum value
C,k N
57 are useful, the other half just duplicates them.
58 Under synchronized conditions, the component of harmonic order h related to the fundamental frequency f appears as the
H,1
59 spectral component of order k, where k = hN .
60 NOTE 2 – The Fast Fourier Transform FFT is a special algorithm allowing short computation times. It requires
i
61 that the number of samples M be an integer power of 2, M = 2 , with i ≥ 10 for example
62 NOTE 3 – The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages.
63 The index C qualifies the variable as spectral component
64
65 Replace 3.2.1 by:
66 Harmonic frequency
67 f
H,h
68 frequency which is an integer multiple of the fundamental frequency of the mains
69 frequency (f = h×f )
H,h H,1
70
71 NOTE 1 The harmonic frequency f is identical with the frequency component f with k = h×N
H,h C,k
72
73 Replace 3.2.2 by:
74 Harmonic order
75 h
76 (integer) ratio of a harmonic frequency to the fundamental frequency of the power
77 system. In connection with the analysis using DFT and synchronisation between f and
H,1
78 f (sampling rate), the harmonic order h corresponds to the spectral component k = h×N
s
79 (k = number of the spectral component, N = number of periods of the fundamental
80 frequency in time T )
N
81 Replace 3.2.3, by:
---------------------- Page: 5 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 5 –
82 r.m.s. value of a harmonic component
83 Y
H,h
84 r.m.s. value of one of the components having a harmonic frequency in the analysis of a
85 non-sinusoidal waveform
86 For brevity, such a component may be referred to simply as a “harmonic”
87 NOTE 1 The harmonic component Y is identical with the spectral component Y with k = h×N ;
H,h C,k
88 (Y = Y ). The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for
H,h C,h×N
89 voltages. The index H qualifies the variable I or U as harmonic.
90 NOTE 2 For the purposes of this standard, the time window has a width of N=10 (50 Hz systems) or N=12
91 (60 Hz system) fundamental periods, i.e. approximately 200 ms (see 4.4.1), This yields Y = Y (50 Hz
H,h C,10×h
92 systems) and Y = Y (60 Hz systems).
H,h C,12×h
93 Page 19
94 Replace 3.2.4, by:
95 r.m.s. value of a harmonic group
96 Y
g,h
97 square root of the sum of the squares of the r.m.s. value of a harmonic and the spectral
98 components adjacent to it within the time window, thus summing the energy contents of
99 the neighbouring components with that of the harmonic proper. See also equation 8 and
100 Figure 4. The harmonic order is given by the harmonic considered.
101 NOTE 1 – The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages.
102 Replace 3.2.5, by:
103 r.m.s. value of a harmonic subgroup
104 Y
sg,h
105 square root of the sum of the squares of the r.m.s. value of a harmonic and the two
106 spectral components immediately adjacent to it. For the purpose of including the effect of
107 voltage fluctuation during voltage surveys, a subgroup of output components of the DFT
108 is obtained by summing the energy contents of the frequency components directly
109 adjacent to a harmonic with that of the harmonic proper. (See also equation 9 and
110 Figure 6). The harmonic order is given by the harmonic considered.
111 NOTE 1 – The symbol Y is replaced, as required by the symbol I for currents, by the symbol U for voltages.
112 Replace 3.3.1, by:
113 Total Harmonic Distortion
114 THD
Y
115 THD (symbol)
Y
116 ratio of the r.m.s. value of the sum of all the harmonic components (Y , ) up to a specified
H h
117 order (h ) to the r.m.s. of the fundamental component (H , ):
max H 1
2
h
max
⎛⎞
Y
H,h
118 THD = (4)
⎜⎟
∑
Y
Y
h2=
H,1
⎝⎠
119
120 NOTE 1 –The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
121 NOTE 2 – The value of h is 40 if no other value is defined in a standard concerned with limits (IEC61000-3-series).
max
---------------------- Page: 6 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 6 –
122 Replace 3.3.2, by:
123 Group total harmonic distortion
124 THDG
Y
125 THDG (symbol)
Y
126 ratio of the r.m.s. value of the harmonic groups (Y ) to the r.m.s. value of the group
g,h
127 associated with the fundamental (Y ):
g,1
2
h
max
⎛⎞
Y
g,h
128 THDG=≥ Where h 2 (5)
⎜⎟
∑
Y min
⎜⎟
Y
h
g ,1
min
⎝⎠
129 NOTE 1 –The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
130 NOTE 2 –The value of h is 2 and that of h is 40 if no other values are defined in a standard concerned with limits (e.g.
min max
131 61000-3-series)
132 Page 21
133 Replace 3.3.3, by:
134 Sub-group total harmonic distortion
135 THDS
Y
136 THDS
Y
137 ratio of the r.m.s. value of the harmonic sub-groups (Y ) to the r.m.s. value of the sub-
sg,h
138 group associated with the fundamental (Y ):
sg,1
2
h
max
⎛⎞
Y
sg,h
139 THDS=≥ Where h 2 (6)
⎜⎟
∑
Y min
⎜⎟
Y
h
sg,1
min
⎝⎠
140 NOTE 2 –The value of h is 2 and that of h is 40 if no other values are defined in a standard concerned with limits (e.g.
min max
141 61000-3-series)
142
143 Replace 3.3.4, by:
144 Partial Weighted Harmonic Distortion
145 PWHD
H,Y
146 PWHD (symbol)
H,Y
147 ratio of the r.m.s. value, weighted with the harmonic order h, of a selected group of higher
148 order harmonics (from the order h to h ) to the r.m.s. value of the fundamental:
min max
2
h
max
⎛⎞
Y
H,h
149 PWHD = h (7)
⎜⎟
∑
H,Y
⎜⎟
Y
h=h
H,1
min⎝⎠
150 NOTE 1 The concept of partial weighted harmonic distortion is introduced to allow for the possibility of
151 specifying a single limit for the aggregation of higher order harmonic components. The partial weighted group
152 harmonic distortion, PWHD can be evaluated by replacing the quantity Y by the quantity Y . The partial
g,Y, H,h g,h
153 weighted sub-group harmonic distortion PWHD can be evaluated by replacing the quantity Y by the
sg,Y H,h
154 quantity Ysg,h. The type of PWHD (PWHDH,Y, PWHDg,Y or PWHDsg,Y) is defined in each standard which uses the PWHD, e.g.
155 in standards concerned with limits (IEC 61000-3-series).
156 NOTE 2 The values of h and h are defined in each standard which uses the PWHD , e.g. in standard
min max Y
157 concerned with limits (IEC61000-3-series).
---------------------- Page: 7 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 7 –
158 Replace 3.4.1, by:
159 R.M.S. value of a spectral component
160 Y
C,k
161 In the analysis of a waveform, the r.m.s. value of a component whose frequency is a multiple of the
162 reciprocal of the duration of the time window.
163 NOTE 1 – If the duration of the time window is multiple of the fundamental frequency, only some of the spectral components
164 have frequencies which are integer multiples of the fundamental frequency.
165 NOTE 2 – The frequency interval between two consecutive spectral components is the reciprocal of the width
166 of the time window, approximately 5 Hz for the purposes of this standard.
167 NOTE 3 – The symbol Y is replaced, as required, by the symbol I for currents or by the symbol U for voltages.
168 Replace 3.4.2, by:
169 R.M.S. value of an interharmonic component
170 Y
C,h
171 r.m.s. value of a spectral component, Y , with a frequency between two consecutive harmonic
C,k ≠ h x N
172 frequencies (see Figure 4). For brevity, such a component may be referred to simply as an
173 “interharmonic”.
174 NOTE 1 – The frequency of the interharmonic component is given by the frequency of the spectral line. This frequency is not
175 an integer multiple of the fundamental frequency.
176 NOTE 2 – A difference is made between an “interharmonic component” Y for k ≠ h x N produced as a physical component
C,k
177 by an equipment e.g. at 183,333 Hz, and a “spectral component” Y for k=1,2,3… as the result of the waveform analysis e.g.
C,k
178 for a 50Hz system at 185 Hz for k = 37 ≠ h x N. A “spectral component” is a “harmonic component” for k = h x N.
179
180 Page 23
181 Replace 3.4.3, by:
182 R.M.S. value of an interharmonic group
183 Y
ig,h
184 r.m.s. value of all spectral components in the interval between two consecutive harmonic
185 frequencies (see Figure 4).
186 NOTE – For the purpose of this standard, the r.m.s. value of the interharmonic group between the harmonic
187 orders h and h+1 is designated as ' Y ', e.g. the group between h=5 and h=6 is designated as Y .
ig,h ig,5
188
189 Replace 3.4.4, by:
190 R.M.S. value of an interharmonic centred subgroup
191 Y
isg,h
192 The r.m.s. value of all spectral components in the interval between two consecutive
193 harmonic frequencies, excluding frequency components directly adjacent to the harmonic
194 frequencies (see Figure 6).
195 NOTE – For the purpose of this standard, the r.m.s. value of the centred subgroup between the harmonic
196 orders h and h+1 is designated as 'Y ', e.g. the group between h=5 and h=6 is designated as Y .
isg,h isg,5
197 Replace 3.4.5, by:
198 Interharmonic group frequency
199 f
ig,h
200 The interharmonic group frequency is the mean of the two harmonic frequencies between
201 which the group is situated, i.e. f = (f + f )/2.
ig,h h h+1
202 Add 3.4.6, by:
---------------------- Page: 8 ----------------------
61000-4-7 A1 Ed.2/CDV © IEC – 8 –
203 Interharmonic centred subgroup frequency (f )
isg,h
204 The interharmonic centred subgroup frequency is the mean of the two harmonic
205 frequencies between which the subgroup is situated, i.e. f = (f + f )/2 .
isg,h h h+1
206 Pages 23 and 24
207 Replace clauses 3.5.1 and 3.5.2 by:
208 3.5.1 Symbols and Abbreviations
209 In this standard, voltage and current values are r.m.s. unless otherwise stated.
210 a amplitude coefficient of a cosine component in a Fourier series
211 b amplitude coefficient of a sine component in a Fourier series
212 c amplitude coefficient in a Fourier series
213 f frequency; function
214 f
C,k
Spectral line frequency of order k
215 f the frequency of the spectral line of order 1. The frequency resolution is equal to this
C,1
216 frequency
217 f
g,h
harmonic-group frequency of order h
218 f
sg,h
harmonic-subgroup frequency of order h
219 f
ig,h
Interharmonic-group frequency of order h
220 f
isg,h
Interharmonic-subgroup frequency of order h
221 f
H,h
harmonic component frequency of order h
222 f
H,1
fundamental frequency of the power system
223 f sampling rate
s
224 h the order of the highest harmonic that is taken into account
max
225 h the order of the lowest harmonic that is taken into account
min
226 j −1
227 t running time
228 B bandwidth
229 Y r.m.s. value of the spectral component of order k
C,k
230 Y r.m.s. value of harmonic group
g,h
231 Y r.m.s. value of interharmonic group
ig,h
232 Y r.m.s. value of interharmonic subgroup
isg,h
233 Y r.m.s. value of harmonic subgroup
sg,h
234 H harmonic
235 I current (r.m.s. value)
236 M integer number; number of samples within the window width
237 N number of power supply periods within the window width
238 P power
239 T time interval
240 T fundamental period of the power supply system
1
241 T window width comprising N fundamental periods
N
242 U voltage (r.m.s. value)
243 Y Variable replaceable by I, U.
244 ω angular frequency
245 ω angular frequency of the power supply
1
246 ϕ phase angle
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247
248 3.5.2 Subscripts
249 b centre-band frequency
250 h running-integer number for harmonic orders
251 k running-integer number for spectral lines
252 m measured value
253 max maximum value
254 min minimum value
255 o smoothed value; d.c. related
256 g grouped value
257 sg sub-grouped value
258 i interharmonic value
259 g,h harmonic group associated with harmonic order h
260 sg,h harmonic subgroup associated with harmonic order h
261 ig,h interharmonic group above harmonic order h
262 isg,h interharmonic centred sub-group above harmonic order h
263 og,h smoothed harmonic group of order h
264 nom nominal value
265 s sampled
266 C value related to spectral line component
267 H harmonic
268 f frequency
269
270 Page 27
271 In clause 4.4.1, replace the paragraph below Note 2 by:
272 The window width shall be 10 (50 Hz systems) or 12 (60 Hz systems) periods ((T = [10 or
N
273 12] x T ≈ 200ms) with rectangular weighting, synchronized to the fundamental frequency
1
274 of the power system. Hanning weighting is allowed only in the case of loss of
275 synchronisation. The loss of synchronization shall be indicated on the instrument display
276 and the data so acquired shall be flagged and shall not be used for the purpose of
277 determining compliance, but may be used for other purposes.
278 Page 27,
279 replace last paragraph by:
280 The output OUT 1 (see Figure 1) shall provide the individual coefficients a and b of the DFT as well
k k
281 as Y , for the current or voltage, i.e. the value of each frequency component calculated.”
C,k
282 Page 29
283 Replace Figure 1 by:
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Sampling
frequency
generation
Input
Preprocessing
voltage
Sampling &
Main instrument
DFT OUT 1 (a , b , Y )
k k C,k
Conversion
Input
Preprocessing
current
Grouping
Input for Active Power
see notes 3 and 4
OUT 2a (Y )
g,h
Smoothing
OUT 2b (Y )
og,h
Check for
Compliance
OUT 3 (pass or fail)
284
285
286 Page 33
287
288 Replace NOTE 2 in Table 1 by
289
290 NOTE 2 Class I instruments are recommended for emission measurements, Class II is recommended for
291 general surveys, but can also be used for emission measurements if the values are such that, even allowing
292 for the increased uncertainty, it is clear that the limits are not exceeded. In practice, this means that the
293 measured values of harmonics should be < 90% of the allowed limits.
294 Replace NOTE 3 in Table 1 by
295 NOTE 3 Additionally, for Class I instruments, the phase shift between individual channels should be smaller
296 than h × 1º
297 Page 37
298 Replace clause 5.4 by:
299 5.4 Measurement set-up and supply voltage
300 5.4.1 Measurement set-up
301 The measurement set-up is given in figures 2 and 3.
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Key
∆ U
L
U Source voltage line-neutral
S
L
S
U EUT terminal voltage
O
Z
L
Z Impedance of wiring and current sensing part
L,N
U E
U U
S
R U
EUT Equipment under test
Z
N
C T
∆U Voltage drop across Z and Z (∆U = ∆U + ∆U )
L N L N
E
N
L Line connection
∆ U
N
N Neutral connection
302 Figure 2 – Measurement set-up for single-phase emission measurement
303
∆ U
L
L 3 U Source voltage line-neutral
S
Z
L
U EUT terminal voltage
S
Z Impedance of wiring and current sensing part
L,N
L
2
O E
Z EUT Equipment under test
L
U U
∆U Voltage drop across Z and Z (∆U=∆U +∆U );
L N L N
R T
L
1
C
For interphase connection, ∆U=2 x ∆U
Z L
L
E
L Line connections
1-3
U U
S
N Neutral connection
Z N
N
∆ U
N
304 Figure 3 – Measurement set-up for three-phase emission measurements
305 5.4.2 Supply voltage
306 5.4.2.1 General
307 While measurements for assessing harmonics up to the 40th harmonic of the mains
308 frequency are being made, the test voltage U at the terminal of the EUT shall meet the
309 following requirements:
310 5.4.2.2 Requirements for measurements for equipment with input current less than
311 or equal to 16 A per phase
312 a) The stability of the test voltage shall be maintained within ±2% of the selected
313 value and the frequency shall be maintained within ±0,5% of the selected value during
314 the test. If the EUT has a specified supply voltage range, the test voltage shall
315 correspond to the nominal voltage of the power system expected to supply the equipment
316 (for example, 230 V line-neutral, corresponding to 400 V line-line). In order to facilitate
317 ease of measurements, for three-wire, three-phase delta connections, an artificial neutral
318 point realized with three resistors matched within 1% may be used if the neutral
319 conductor is not available from the source. The purpose of the artificial neutral point is to
320 permit voltage and power-per-phase measurements to be made in a line-to-neutral
321 configuration as well as line-to-line. The errors introduced into measurements of EUT
322 currents, during emission tests by the loading effect of the voltmeter part of the
323 instrument and any installed artificial neutral network shall not exceed 0,05%.
324 NOTE - In many cases the artificial neutral is not required, but if it is, several approaches can be used. It
325 may be provided by the three input impedances of the voltmeters in the measuring instrument. Alternatively,
326 the artificial neutral may effectively consist of the combined effect of an explicit network plus the input
327 impedances of the voltmeters in the measuring instrument. It is also possible that the artificial neutral
328 network, if it is present, and the input impedances of the voltmeters may be so connected as not to introduce
329 any errors in current measurements (because the loading occurs on the source side of the current
330 transducer). In still other cases, errors introduced by the loading effect of the artificial neutral network and
331 the input impedances of the voltmeters in the instrument may be adequately compensated by regulating
332 feedback loops in the source such that errors that otherwise might be introduced do not, in fact, occur. Many
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333 other configurations may be satisfactory, provided the required uncertainty is not exceeded.For a three
334 phase-supply, the three line voltages shall have a phase relationship of 0°, 120° ± 1,5°, 240° ± 1,5°.
335 b) The voltage harmonic distortion of the EUT test voltage U shall not exceed the
336 following values with the EUT connected and operating under the specified test
337 conditions:
338 0,9% for harmonic of order 3;
339 0,4% for harmonic of order 5;
340 0,3% for harmonic of order 7;
341 0,2% for harmonic of order 9;
342 0,2% for even harmonics of order from 2 to 10;
343 0,1% for harmonics of order from 11 to 40.
344 c) The peak value of the test voltage shall be within a range of 1,404 to 1,424 times
345 its r.m.s. value and shall be reached between 87° and 93° after the zero crossing.
346 d) The voltage drop ∆U across the impedance of the current sensing part and the
347 wiring shall not exceed a peak voltage of 0,5 V.
348 5.4.2.3 Requirements for measurements for equipment with input current above 16
349 A and less than or equal to 75 A per phase
350 The supply source shall meet the following requirements:
351 a) the output voltage U shall be the rated voltage of the equipment. In the case of a
352 voltage range, the output voltage shall be a nominal system voltage according to
353 IEC 60038 (for example: 120 V or 230 V for single-phase or 400 V line-line for three-
354 phase). In order to facilitate ease of measurements, for three-wire, three-phase delta
355 connections, an artificial neutral point realized with three resistors matched within 1%
356 may be used if the neutral conductor is not available from the source. The purpose of
357 the artificial neutral point is to permit voltage and power-per-phase measurements to
358 be made in a line-to-neutral configuration as well as line-to-line. The errors
359 introduced into measurements of EUT currents, during emission tests by the loading
360 effect of the voltmeter part of the instrument and any installed artificial neutral
361 network shall not exceed 0,05%;
362 b) while the measurements are being made, the output voltage shall be maintained
363 within ±2,0% and the frequency within ±0,5% of the nominal value;
364 c) in the case of a three-phase supply, the voltage unbalance shall be less than 50 % of
365 the voltage unbalance compatibility level given in IEC 61000-2-2;
366 d) the harmonic ratios of the output voltage U in no-load condition shall not exceed:
367 – 1,5 % for harmonic of order 5;
368 – 1,25 % for harmonics of order 3 and 7;
369 – 0,7 % for harmonic of order 11;
370 – 0,6 % for harmonics of order 9 and 13;
371 – 0,4 % for even harmonics of order 2 to 10;
372 – 0,3 % for harmonics of order 12 and 14 to 40;
373 e) for the application of Tables 2 and 3, the impedance of the supply source is such that
374 the R is equal to or higher than the anticipated minimum R value (R )
sce sce sce min
375 allowing the compliance of the equipment, with possible insertion of reactors.
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376 f) For the application of Table 4, the impedance of the supply source is such that the
377
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