IEC 60358-2:2013

Coupling capacitors and capacitor dividers - Part 2: AC or DC single-phase coupling capacitor connected between line and ground for power line carrier-frequency (PLC) application

IEC 60358-2:2013 applies to AC or DC single-phase coupling capacitors, with rated voltage > 1 000 V, connected between line and ground with a low voltage terminal either permanently earthed or connected to a device for power line carrier-frequency (PLC) applications at frequencies from 30 kHz to 500 kHz or similar applications (DC or AC) at power frequencies from 15 Hz to 60 Hz. The transmission requirements for coupling devices for power line carrier (PLC) systems are defined in IEC 60481. Keywords: AC or DC single-phase coupling capacitors, power line carrier-frequency (PLC). This standard cancels and replaces the second edition of IEC 60358 (1990), and constitutes a technical revision.
This publication is to be read in conjunction with IEC 60358-1:2012.

Condensateurs de couplage et diviseurs capacitifs - Partie 2: Condensateur de couplage monophasé à courant alternatif ou à courant continu connecté entre la ligne et la terre pour application aux liaisons à courant porteur sur lignes d'énergie (CPL)

La CEI 60358-2:2013 s'applique aux condensateurs de couplage monophasés à courant alternatif ou à courant continu, de tension assignée supérieure à 1 000 V, connectés entre la ligne et la terre, avec la borne basse tension connectée de manière permanente à la terre ou connectée à un dispositif, pour des applications de liaisons à courant porteur sur lignes d'énergie (CPL) à des fréquences allant de 30 kHz à 500 kHz ou pour des applications semblables; à courant continu ou courant alternatif à des fréquences industrielles allant de 15 Hz à 60 Hz. Les exigences sur la transmission pour les dispositifs de couplage pour les systèmes à courant porteur sur lignes d'énergie (CPL) sont définies dans la CEI 60481. Mots clés: condensateurs de couplage monophasés à courant alternatif ou à courant continu, lignes d'énergie (CPL) à des fréquences
Cette publication doit être lue conjointement avec la CEI 60358-1:2012.

General Information

• Status: Published
• Publication Date: 11-Aug-2013
• ICS: 29.120.99 - Other electrical accessories
• ICS: 29.240.99 - Other equipment related to power transmission and distribution networks
• ICS: 31.060.70 - Power capacitors
• Technical Committee: TC 33 - Power capacitors and their applications
• Drafting Committee: MT 20 - TC 33/MT 20
• Current Stage: PPUB - Publication issued
• Start Date: 12-Aug-2013
• Completion Date: 15-Sep-2013

Standards Content (Sample)

IEC 60358-2 ®
Edition 1.0 2013-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Coupling capacitors and capacitor dividers –
Part 2: AC or DC single-phase coupling capacitor connected between line and
ground for power line carrier-frequency (PLC) application

Condensateurs de couplage et diviseurs capacitifs –
Partie 2: Condensateur de couplage monophasé à courant alternatif ou à
courant continu connecté entre la ligne et la terre pour application aux liaisons à
courant porteur sur lignes d’énergie (CPL)

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IEC 60358-2 ®
Edition 1.0 2013-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Coupling capacitors and capacitor dividers –

Part 2: AC or DC single-phase coupling capacitor connected between line and

ground for power line carrier-frequency (PLC) application

Condensateurs de couplage et diviseurs capacitifs –

Partie 2: Condensateur de couplage monophasé à courant alternatif ou à

courant continu connecté entre la ligne et la terre pour application aux liaisons à

courant porteur sur lignes d’énergie (CPL)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX R
ICS 29.120.99; 29.240.99; 31.060.70 ISBN 978-2-8322-1038-3

– 2 – 60358-2 © IEC:2013
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
3.200 Carrier-frequency accessories definitions . 8
4 Service conditions . 8
5 Ratings . 8
6 Design requirements . 8
6.200 Design requirements for coupling capacitor and carrier-frequency
accessories . 8
6.200.1 Design requirements for coupling capacitor . 8
6.200.2 Design requirements for carrier-frequency accessories . 9
7 Test conditions . 10
8 Classification of tests . 10
8.1 General . 10
8.2 Routine tests . 10
8.2.200 General . 10
8.2.201 Routine tests for carrier frequency accessories . 10
8.3 Type tests . 10
8.3.200 Type test for coupling capacitor and carrier-frequency
accessories . 10
8.4 Special tests. 11
9 Routine tests . 11
9.1 Tightness of the liquid-filled equipment. 11
9.2 Electrical routine tests . 11
9.2.200 Electrical tests for coupling capacitor and carrier frequency
accessories . 11
10 Type tests . 12
10.200 Test on capacitor . 12
10.200.1 High frequency capacitance and equivalent series resistance . 12
10.200.2 Measurement of the stray capacitance and stray conductance of
the low voltage terminal . 12
10.201 Type test on carrier frequency accessories . 13
10.201.1 General . 13
10.201.2 Type tests for drain coil . 13
10.201.3 Type test for voltage limitation device together with drain coil:
Impulse voltage test . 14
11 Special tests . 14
12 Marking . 15
12.1 General . 15
12.2 Marking of capacitor . 15
12.200 Marking of the carrier-frequency accessories . 15
Annexes . 15
Annex A (informative) Typical diagram of an equipment . 16

60358-2 © IEC:2013 – 3 –
Annex AA (informative) High-frequency characteristics of coupling capacitors for
power line carrier circuits . 17
Bibliography . 19

Figure A.200.1 – Example of a diagram for a coupling capacitor with carrier-frequency
accessories (see IEC 60481) . 16
Figure AA.1 – Wiring diagram of the measuring circuit for the high-frequency
capacitance and equivalent series resistance of a coupling capacitor . 18
Figure AA.2 – Relation between length and capacitance where capacitive deviation –
20 % to +50 % can be fulfilled up to 500 kHz . 18

Table 200 – Limits of temperature rise of windings. 14

– 4 – 60358-2 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COUPLING CAPACITORS AND CAPACITOR DIVIDERS –

Part 2: AC or DC single-phase coupling capacitor connected between
line and ground for power line carrier-frequency (PLC) application

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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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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6) All users should ensure that they have the latest edition of this publication.
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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.
International Standard IEC 60358-2 has been prepared by IEC technical committee 33: Power
capacitors and their applications.
The text of this standard is based on the following documents:
FDIS Report on voting
33/531/FDIS 33/537/RVD
Full information on the voting for the approval of this standard 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.
A list of all parts in the IEC 60358 series, published under the general title Coupling
capacitors and capacitor dividers, can be found on the IEC website.

60358-2 © IEC:2013 – 5 –
This International Standard is to be used in conjunction with the latest edition of IEC 60358-1
and its amendments. It was established on the basis of the first edition (2012) of that
standard.
This Part 2 supplements or modifies the corresponding clauses in IEC 60358-1.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies
as far as is reasonable. Where this Part 2 states “addition” or “replacement”, the relevant text
in Part 1 is to be adapted accordingly.
For additional clauses, subclauses, figures, tables or annexes, the following numbering
system is used:
– subclauses, tables and figures which are additional to those in Part 1 are numbered
starting from 200;
– additional annexes are lettered AA, BB etc.
– as the notes are integrated into the clauses, their numbering starts from 1 as usual.
The committee has decided that the contents of this publication will remain unchanged until
the stability 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – 60358-2 © IEC:2013
INTRODUCTION
This series consists of the following parts:
IEC 60358-1, Coupling capacitors and capacitor dividers – Part 1: General rules
IEC 60358-2, Coupling capacitors and capacitor dividers – Part 2: AC or DC single-phase
coupling capacitor connected between line and ground for power line
carrier-frequency (PLC) application
IEC 60358-3 , Coupling capacitors and capacitor dividers – Part 3: AC or DC single-phase
coupling capacitor connected between line and ground for harmonic-filters
applications
IEC 60358-4 , Coupling capacitors and capacitor dividers – Part 4: AC or DC single-phase
capacitor-divider and RC-divider connected between line and ground
(except for CVT’s which belong to IEC 61869 series)

—————————
Under consideration.
Under consideration.
60358-2 © IEC:2013 – 7 –
COUPLING CAPACITORS AND CAPACITOR DIVIDERS –

Part 2: AC or DC single-phase coupling capacitor connected between
line and ground for power line carrier-frequency (PLC) application

1 Scope
Clause 1 of IEC 60358-1:2012 is applicable with the following additions:
This part of the IEC 60358 series applies to AC or DC single-phase coupling capacitors, with
rated voltage > 1 000 V, connected between line and ground with a low voltage terminal either
permanently earthed or connected to a device for power line carrier-frequency (PLC)
applications at frequencies from 30 kHz to 500 kHz or similar applications (DC or AC) at
power frequencies from 15 Hz to 60 Hz.
The transmission requirements for coupling devices for power line carrier (PLC) systems are
defined in IEC 60481.
NOTE Diagrams of coupling capacitors to which this standard applies are given in Figure A.1.
2 Normative references
Clause 2 of IEC 60358-1:2012 is replaced by the following:
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60060-2, High-voltage test techniques – Part 2: Measuring systems
IEC 60358-1:2012, Coupling capacitors and capacitor dividers. – Part 1: General rules
IEC 60481, Coupling devices for power line carrier systems
IEC 61869-5, Instrument transformers – Part 5: Additional requirements for capacitor voltage
transformers
3 Terms and definitions
Clause 3 of IEC 60358-1:2012 is applicable with the following additions:
For the purposes of this document, the terms and definitions given in Clause 3 of
IEC 60358-1:2012, as well as the following apply.

– 8 – 60358-2 © IEC:2013
3.200 Carrier-frequency accessories definitions
3.200.1
coupling device
arrangement of elements which contribute to ensure, together with one or more associated
coupling capacitors, the transmission, under prescribed conditions, of carrier-frequency
signals between one or more conductors of the power line and the carrier-frequency
connection
3.200.2
carrier-frequency accessories
circuit element intended to permit the injection of carrier frequency signal and which is
connected between the low voltage terminal of a coupling capacitor unit and earth, and having
an impedance which is insignificant at the power frequency, but appreciable at carrier
frequency
Note 1 to entry: See Figure A.1.
3.200.3
drain coil
inductance which is connected between the low voltage terminal of a coupling capacitor and
earth, and whose impedance is insignificant at the power frequency, but has a high value at
the carrier frequency
3.200.4
voltage limitation device
element connected between the coupling capacitor and earth to limit the overvoltages which
appear across the coupling device.
Note 1 to entry: Overvoltages appear in case of:
a) a short circuit between the high-voltage terminal and earth;
b) where an impulse voltage is applied between the high voltage terminal and earth.
3.200.5
carrier earthing switch
switch for earthing the low voltage terminal
4 Service conditions
Clause 4 of IEC 60358-1:2012 is applicable.
5 Ratings
Clause 5 of IEC 60358-1:2012 is applicable.
6 Design requirements
Clause 6 of IEC 60358-1:2012 is applicable with the following additions:
6.200 Design requirements for coupling capacitor and carrier-frequency accessories
6.200.1 Design requirements for coupling capacitor
Coupling capacitors shall be designed to withstand an additional steady high frequency
current of at least 1 A (r.m.s. value of current equivalent to a power of 400 W for a terminal
resistance of 400 Ω), without any damage or deterioration.

60358-2 © IEC:2013 – 9 –
6.200.2 Design requirements for carrier-frequency accessories
6.200.2.1 General
The carrier-frequency accessories, comprising a drain coil and a protective device, shall be
connected between the low voltage terminal of the coupling capacitor and the earth terminal.
The connections are typically as shown in Figure A.1.
The requirements for the complete coupling device are specified in IEC 60481.
6.200.2.2 Drain coil
The drain coil shall be designed in such a way, that:
a) for an AC application, the impedance should be as low as possible and in no case exceed
20 Ω at power frequency;
for a DC application, no standard value is defined; manufacturer and purchaser shall
define the impedance value;
b) the current-carrying capability at power frequency is as follows:
– continuous operation: rated current of capacitor, but not less than 1 A r.m.s.;
– short-time current: 30 A r.m.s. for 0,2 s;
c) the drain coil shall be able to withstand a 1,2/50 μs impulse voltage whose peak value is
twice the value of the impulse spark voltage of the voltage limitation device, but the
minimum value should be 10 kV peak (see 10.201.2.2)
d) for a drain coil with iron core, the insulation between winding and iron core shall support
3 kV for 60 s (see 9.2.200.2.1.3).
e) If the maximum fundamental frequency current of the capacitor is higher than 1 A, the
continuous operation current for the drain coil should be increased accordingly
f) for a DC application, the grading current of the coupling capacitor shall not saturate the
drain coil.
6.200.2.3 Voltage limitation device
A lightning arrester shall be connected as directly as possible between the low voltage
terminal of the coupling capacitor and the earth terminals and shall be capable of protecting
the coupling device and the carrier-frequency connection.
For AC applications: The AC protection level voltage U at power frequency shall be greater
PL
than 10 times the maximum AC voltage across the drain coil during rated operation
conditions.
The voltage U is given by the following formula:
PL
U
m
U ≥ 10⋅ F ⋅ ⋅(2⋅π ⋅ f ) ⋅ C ⋅ L
PL V R R D
where
L is the value of the drain coil in henry;
D
F is the voltage factor according to IEC 60358-1:2012, Table 2.
V
NOTE 1 Arresters of the air-gap type or those of the non-linear resistor type are used.
Example:
a) power-frequency withstand test voltage:
– air-gap arrester: 2 kV r.m.s.,
– arrester with spark-gap: rated voltage: approx. 1 kV r.m.s.

– 10 – 60358-2 © IEC:2013
b) impulse withstand voltage:
– air-gap arrester and arrester with spark-gap: at test impulse voltage of about 4 kV peak with a wave shape
8/20 μs the arrester are able to sustain the peak current of at least 5 kA.
NOTE 2 It is desirable that the arrester be capable of sustaining a power frequency current of at least 5 kA r.m.s.
for a period of 0,2 s while ensuring, even if damaged, that the other parts of the coupling device remain adequately
protected.
For DC applications:
The DC protection level voltage U shall be:
PL
U ≥ 3,5 kV DC
PL
NOTE 3 3,5 kV coming from 2,5 kV AC × √2.
7 Test conditions
Clause 7 of IEC 60358-1:2012 is applicable.
8 Classification of tests
8.1 General
Subclause 8.1 of IEC 60358-1:2012 is applicable with the following addition:
The tests specified in this standard are classified as routine tests, type tests and special
tests.
8.2 Routine tests
Subclause 8.2 of IEC 60358-1:2012 is applicable with the following additions:
8.2.200 General
The tests specified in 8.1 apply to coupling capacitors.
8.2.201 Routine tests for carrier frequency accessories
8.2.201.1 Routine test for drain coil
a) current carrying capability test (9.2.200.2.1.1);
b) measurement of the impedance at power frequency (9.2.200.2.1.2);
c) voltage test between winding and iron core (9.2.200.2.1.3).
8.2.201.2 Routine test for voltage limitation devise
AC or DC voltage test (9.2.200.2.2.1).
8.3 Type tests
Subclause 8.3 of IEC 60358-1:2012 is applicable with the following additions:
8.3.200 Type test for coupling capacitor and carrier-frequency accessories
8.3.200.1 Type test for coupling capacitors
a) high frequency capacitance and equivalent series resistance (10.200.1);

60358-2 © IEC:2013 – 11 –
b) measurement of the stray capacitance and stray conductance of the low voltage terminal
(10.200.2).
8.3.200.2 Type tests for carrier-frequency accessories
8.3.200.2.1 Type tests for drain coil
a) impedance measurement (10.201.2.1);
b) impulse voltage test (10.201.2.2);
c) current capability test (10.201.2.3);
d) short time current test (10.201.2.4).
8.3.200.2.2 Type test for voltage limitation device together with drain coil
a) impulse voltage test (10.201.2.2).
8.4 Special tests
Subclause 8.4 of IEC 60358-1:2012 is applicable.
9 Routine tests
9.1 Tightness of the liquid-filled equipment
Subclause 9.1 of IEC 60358-1:2012 is applicable.
9.2 Electrical routine tests
Subclause 9.2 of IEC 60358-1:2012 is applicable with the following additions:
9.2.200 Electrical tests for coupling capacitor and carrier frequency accessories
9.2.200.1 Routine tests for coupling capacitor
The routine tests on the coupling capacitor are specified in IEC 60358-12012, 8.1. No
supplementary test is specified for PLC application for coupling capacitors.
9.2.200.2 Routine tests for carrier frequency accessories
9.2.200.2.1 Routine tests for drain coil
9.2.200.2.1.1 Current carrying capability test
The test shall be carried out, applying for 1 min a power frequency voltage between the
terminals of the drain coil. The test voltage shall be adjusted to achieve a current twice the
rated current of the capacitor, but not less than 1 A (r.m.s.). No damage shall occur.
9.2.200.2.1.2 Measurement of the impedance at power frequency
The measured value shall be within the range specified by the manufacturer. This test shall
be performed after the current carrying capability test.
9.2.200.2.1.3 Voltage test between winding and iron core
The test shall be carried out, applying a 3 kV power frequency voltage between the terminals
of the winding and the iron core for 1 min.
9.2.200.2.2 Routine test for voltage limitation devices
The following routine test is specified according to the cases below:

– 12 – 60358-2 © IEC:2013
a) air-gap arrester;
measurement of the protection level voltage;
the voltage AC or DC is increased until breakdown. The breakdown voltage must be within
the range specified by the manufacturer;
b) arrester;
measurement of the reference voltage of arrester;
the AC voltage is increased on the arrester until the current reach 1 mA r.m.s, the
measured reference voltage must be within the range specified by the manufacturer.
10 Type tests
Clause 10 of IEC 60358-1:2012 is applicable with the following additions:
10.200 Test on capacitor
10.200.1 High frequency capacitance and equivalent series resistance
The measurements shall be carried out on a complete capacitor or on a capacitor unit.
The capacitances and the equivalent series resistances shall be measured at the two temperatures
equal to the limits of the temperature category and at a temperature within the standard range
for testing (IEC 60358-1:2012, Clause 7), at several frequencies over the whole frequency
range specified in Clause 1.
The measured values of the capacitance between the line and low voltage terminals shall not
deviate by more than –20 % to +50 % from the rated capacitance.
For very high capacitance value and higher rated voltage values, the self-inductance of the
capacitor (typical 1 μH/m) will not permit to cover the complete PLC frequency range given in
Clause 1. In that case the usable frequency range shall be agreed between manufacturer and
purchaser (see Annex AA).
The measured values of the equivalent series resistance between the line and low voltage
terminals of the complete equipment shall not exceed 40 Ω at any frequency and temperature.
For the lower measuring frequencies (for instance 30 kHz to 100 kHz) with a temperature
equal to the lower limit of the category, or for capacitor stacks with a capacitance equal to or
less than 2 000 pF, or for U greater than 420 kV, the equivalent series resistance may be
m
higher than 40 Ω. In this case, the value shall be agreed between manufacturer and
purchaser.
For high frequency characteristics and measuring methods, see Annex AA.
In the case of practical difficulties in carrying out the measurements at the limits of the
temperature category, the purchaser and the manufacturer may agree on measurements over
a smaller temperature range, or on measurements performed on a model capacitor containing
a limited number of elements.
10.200.2 Measurement of the stray capacitance and stray conductance of the low
voltage terminal
The measurements shall be carried out either on a unit or on a model representative of the
bottom part of the capacitor under consideration.
This model shall include the earth terminal, the metal parts (e.g. flanges) permanently

connected to it, and the low voltage terminal with at least one element connected to it and

60358-2 © IEC:2013 – 13 –
placed in its proper position. If a model is used, it shall be filled with the insulating liquid used
for the capacitor.
The values of the stray capacitance and the stray conductance, measured at any frequency in
the carrier frequency range, shall not exceed 200 pF and 20 μs respectively.
To avoid a harmful increase of the stray conductance in polluted ambient conditions, the low
voltage terminal should have a creepage distance in accordance with IEC 60358-1:2012,
6.2.7.
10.201 Type test on carrier frequency accessories
10.201.1 General
The routine tests according to 9.2.200.2 shall be repeated after the type tests.
10.201.2 Type tests for drain coil
10.201.2.1 Impedance measurement
The impedance shall be measured within the carrier-frequency range. The proposed
frequency steps are 30, 50, 100, 200, 300, 400 and 500 kHz.
The value of impedance shall be within the specified limit.
10.201.2.2 Impulse voltage test
The impulse voltage test shall be performed between the terminals of the drain coil installed
in its enclosure after disconnecting the voltage limitation device.
The peak value shall be twice the value of the impulse spark voltage of the voltage limitation
device, but the minimum value should be 10 kV peak.
Ten 1,2 / 50 μs voltage impulses shall be applied in sequence, five negative and five positive
(see IEC 60060-1).
10.201.2.3 Current carrying capability test
The current carrying capability test shall be carried out, by applying a power frequency
voltage between the terminals of the drain coil. The test voltage shall be adjusted to achieve
the rated current that shall not be less than 1 A (r.m.s). During this test the temperature rise
ΔT shall be measured and the test shall be continued until the temperature has reached a
steady state (ΔT < 1 K/h). The temperature rise shall not exceed the appropriate value given
in Table 200.
– 14 – 60358-2 © IEC:2013
Table 200 – Limits of temperature rise of windings
Class of insulation (in accordance with IEC 60085) Maximum temperature rise
ΔT
K
All classes, immersed in oil. 60
When the drain coil is not so fitted or arranged, the temperature rise ΔT of the oil at
the top of the housing shall not exceed 50 K.
All classes, immersed in oil and hermetically sealed. 65
When the drain coil has an inert gas above the oil, or is hermetically sealed, the
temperature rise ΔT of the oil at the top of the housing shall not exceed 55 K.
All classes, immersed in bituminous compound. 50
Classes not immersed in oil or bituminous compound:
Y 45
A 60
E 75
B 85
F 110
H 135
The temperature rise ΔT measured on the external surface of the core and other
metallic parts which are in contact with, or adjacent to, insulation shall not exceed
the appropriate values.
For some materials (e.g. resin) the manufacturer should specify the relevant insulation class.
10.201.2.4 Short time current test
The test shall be carried out, by applying a power frequency voltage between the terminals of
the drain coil. The test voltage shall be adjusted to achieve a current of 30 A (r.m.s.) for 0.2 s.
The measurement of impedance has to be performed before and after the test (coil at room
temperature). The measured value has to be within the specified tolerance.
10.201.3 Type test for voltage limitation device together with drain coil: Impulse
voltage test
The test shall be performed between the terminals of the voltage limitation device together
with the drain coil installed in their enclosure.
The impulse voltage is increased step by step until the protection level voltage of the voltage
limitation device is reached.
The value of the protection level voltage has to be at maximum 50 % of the impulse voltage
withstand capability of the drain coil.
For air-gap arresters and arresters: 8/20 μs protection level voltage impulse shall be applied
in sequence, five negative and five positive.
NOTE 1 The test can be done with a 1,2/50 μs.
NOTE 2 Additional tests, such as composite loss and return loss tests, concerning complete coupling devices for
PLC systems are covered by IEC 60481.
11 Special tests
Clause 11 of IEC 60358-1:2012 is applicable with the following addition:

60358-2 © IEC:2013 – 15 –
The special tests are specified in IEC 60358-1:2012, 8.4. No supplementary test is specified
for PLC application for coupling capacitors.
12 Marking
12.1 General
Subclause 12.1 of IEC 60358-1:2012 is applicable.
12.2 Marking of capacitor
Subclause 12.2 of IEC 60358-1:2012 is applicable with the following addition:
12.200 Marking of the carrier-frequency accessories
For the carrier-frequency accessories, the rating plate shall include the following information
Carrier–frequency accessories
Drain coil L       mH
D
Voltage limitation device Type:
Protection level
voltage (1,2/50 μs or 8/20 μs or DC)

Annexes
The annexes of IEC 60358-1:2012 apply except as follows:

– 16 – 60358-2 © IEC:2013
Annex A
(informative)
Typical diagram of an equipment

Annex A of IEC 60358-1:2012 is applicable with the following addition:

High voltage terminal
A
C
High voltage capacitor
Low voltage terminal of
coupling capacitor N Earth terminal
HF
To PLC-system
Voltage
limitation device
Drain coil
N
IEC  2118/13
Figure A.200.1 – Example of a diagram for a coupling capacitor
with carrier-frequency accessories (see IEC 60481)

60358-2 © IEC:2013 – 17 –
Annex AA
(informative)
High-frequency characteristics of coupling capacitors
for power line carrier circuits

AA.1 High-frequency capacitance and equivalent series resistance (10.200.1)
The frequency conditions mentioned in Clause 1 are those occurring in the great majority of
cases. For different conditions that may occur in certain countries for frequencies above
500 kHz or below 30 kHz, the recommendations may differ, if necessary, from the values
indicated for the type test (Clause 10).
The fact should be considered that any change in the high-frequency characteristics of the
coupling capacitor, such as, for instance, a change in the capacitance of the coupling
capacitor itself or the introduction of stray quantities (capacitance, etc.) may affect the
transmission bandwidth (useful frequency band), shift this band and produce an additional
coupling attenuation.
AA.2 Stray capacitance and conductance of the low voltage terminal (10.200.2)
Stray capacitance and conductance of the low voltage terminal, with respect to the earth
terminal, should be as low as possible.
Terminal design and arrangement should be chosen so that the effect of adverse atmospheric
conditions (humidity, snow, frost, dust, etc.) does not involve stray capacitance and
conductance values appreciably higher than those stated above and in Clause 10.
NOTE 1 Values higher than 20 μs may have an appreciable effect on the bandwidth of the coupling equipment, at
least for operation at frequencies lower than 100 kHz and for a low coupling capacitance.
NOTE 2 The values given in Clause 10 cannot generally be obtained when testing a complete capacitor voltage
transformer, owing to the capacitance and the additional losses of the electromagnetic unit. In the case of a
capacitor voltage transformer, the following limiting values can generally be assumed:
– for stray capacitance: (300 + 0,05) × C (in pF), where C represents the rated capacitance, expressed in
R R
picofarads;
– for stray conductance: 50 μs.
AA.3 Bridge method for measurement of the high-frequency capacitance and
equivalent series resistance (10.200.1)
The measuring method giving the values of high-frequency capacitance and equivalent series
resistance may be chosen, as convenient, from various high frequency procedures such as
bridge methods, substitution methods, impedance analyser, etc.
It is recommended that capacitances and inductances due to the measurement connections
should be reduced as far as possible (by minimizing the length thereof) and likewise the earth
capacitances of the coupling capacitor. Particular care should be taken to screen the
measuring equipment and, if necessary, the connections.
If the stray capacitance and inductance of the measuring arrangement produce an
appreciable effect, this shall be allowed for in computing the results of the measurements.
The introduction of uncontrolled stray elements may give rise to serious errors in measuring
the capacitance.
– 18 – 60358-2 © IEC:2013
In order to reduce to insignificant values the inductances due to the measurement
connections, it is suggested that two cages, insulated from one another, and each made with
six or eight copper straps be used. These cages shall surround the capacitor under test and
shall be in close contact with the insulating material throughout its length. One end of the
upper cage should be connected to the line terminal, while one end of the lower cage should
be connected to the low voltage terminal. The measuring bridge should be connected with two
wires as short as possible, to the two other ends of the cages as shown in Figure AA.1.
HT
LT
IEC  2119/13
Key
HT line terminal
LT low voltage terminal
Figure AA.1 – Wiring diagram of the measuring circuit for the high-frequency
capacitance and equivalent series resistance of a coupling capacitor
AA.4PLC frequency range for high capacitance and long capacitor (10.200.1)
For very high capacitance values and long capacitors, the physical self-inductance of the
st
capacitor (typically 1 μH/m) will reduce the 1 resonance frequency. If this is the case, the
deviation of the capacitance between the line and low voltage terminals in the range of–20 %
to +50 % from the rated capacitance cannot be obtained; in that case, the usable PLC
frequency range shall be agreed between manufacturer and purchaser.
The graph presented in Figure AA.2 shows the cases where the relation between length and
capacitance can fulfil the capacitive deviation –20 % to +50 % up to 500 kHz.
Length/capacitance relation
Length/capacitance relation
150.150,00
125.0
125,0
100.0
100,0
75.0
75,0
50.0
50,0
25.25,00
0.00
0 1,0 2,0 3,0 4,0 5,0
0.0 1.0 2.0 3.0 4.0 5.0
LengtLength ofh of ccapaapacitorcit  (orm) [ m]
IEC  2120/13
Figure AA.2 – Relation between length and capacitance where capacitive deviation
–20 % to +50 % can be fulfilled up to 500 kHz
Capacitance [nF]
Capacitance  (nF)
60358-2 © IEC:2013 – 19 –
Bibliography
IEC 60085, Electrical insulation – Thermal evaluation and designation
IEC 60721 (all parts), Classification of environmental conditions
IEC 61462, Composite hollow insulators – Pressurized and unpressurized insulators for use in
electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods,
acceptance criteria and design recommendations
CISPR 16-1-1, Specification for radio disturbance and immunity measuring apparatus and
methods − Part 1-1: Radio disturbance and immunity measuring apparatus − Measuring
apparatus
_____________
– 20 – 60358-2 © CEI:2013
SOMMAIRE
AVANT-PROPOS . 22
INTRODUCTION . 24
1 Domaine d’application . 25
2 Références normatives . 25
3 Termes et définitions . 25
3.2
...