IEC 61869-11:2017

IEC 61869-11 ®
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 11: Additional requirements for low-power passive voltage transformers

Transformateurs de mesure –
Partie 11: Exigences supplémentaires pour les transformateurs de tension
passifs de faible puissance
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IEC 61869-11 ®
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 11: Additional requirements for low-power passive voltage transformers

Transformateurs de mesure –
Partie 11: Exigences supplémentaires pour les transformateurs de tension

passifs de faible puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5130-0

– 2 – IEC 61869-11:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
3.1 General definitions . 8
3.2 Definitions related to dielectric ratings and voltages . 10
3.4 Definitions related to accuracy . 10
3.7 Index of abbreviations and symbols . 11
5 Ratings . 12
5.3 Rated insulation levels and voltages . 12
5.5 Rated output . 12
5.6 Rated accuracy class . 12
5.1101 Standard values of rated voltages . 15
5.1102 Standard values of rated voltage factor F . 15
V
6 Design and construction . 16
6.11 Electromagnetic compatibility (EMC) . 16
6.13 Markings . 16
6.601 Requirements for optical transmitting system and optical output link . 17
6.602 Requirements for electrical transmitting system and electrical wires for
output link . 17
6.603 Signal-to-noise ratio . 17
6.604 Failure detection and maintenance announcement . 18
6.605 Operability . 18
6.606 Reliability and dependability . 18
6.1101 Transient response requirements . 18
6.1102 Voltage limitation device requirements . 18
7 Tests . 18
7.1 General . 18
7.2 Type tests . 20
7.3 Routine tests. 23
7.4 Special tests . 24
601 Information to be given with enquiries, tenders and orders . 26
601.1 Designation . 26
601.2 Dependability . 27
Annex 11A (normative) Tests for impact of electric field from other phases . 28
11A.1 General . 28
11A.2 Test setup . 28
11A.3 Test procedure . 29
Annex 11B (informative) Designation of accuracy class when using corrected
transformation ratio and ratio correction factor . 30
11B.1 General . 30
11B.2 Designation of accuracy class based on rated transformation ratio . 31
11B.3 Designation of accuracy class based on individual ratio correction factor . 31
Annex 11C (informative) Types of divider principles covered by this part of IEC 61869 . 32
Bibliography . 33

Figure 1101 – General block diagram of a single-phase low-power passive voltage
transforme . 7
Figure 1102 – Terminal markings for passive LPVT . 16
Figure 1103 – RC-divider with external low-voltage part outside the main housing . 22
Figure 1104 – Connection for voltage withstand test of the external low-voltage part of
a divider . 23
Figure 1105 – Step response time of a passive LPVT . 26
Figure 11A.1 – Test setup for LPVT used in air- insulated substations . 28
Figure 11B.1 – Accuracy class designation improved, based on individual ratio
correction factor CF . 31
U
Figure 11C.1 – Divider principles . 32

Table 1101 – Limits of ratio error and phase error for measuring LPVT . 13
Table 1102 – Limits of ratio error and phase error for protection and multipurpose
LPVT . 14
Table 1103 – Standard values of rated voltage factors . 15
Table 1104 – Pin assignment for RJ45 connectors used in passive LPVT . 17
Table 10 – List of tests. 19
Table 1105 – Burden values for basic accuracy tests . 21
Table 1106 – Designation of a passive LPVT . 27

– 4 – IEC 61869-11:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 11: Additional requirements for low-power
passive voltage transformers
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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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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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 61869-11 has been prepared by IEC technical committee 38:
Instrument transformers.
This first edition of IEC 61869-11, together with IEC 61869-1 and IEC 61869-6, cancels and
replaces the relevant clauses or subclauses of the first edition of IEC 60044-7, published in
1999 and the first edition of IEC 60044-8, published in 2002 . This edition constitutes a
technical revision.
____________
IEC 60044-7 and IEC 60044-8 will eventually be replaced by the IEC 61869 series, but until all the relevant
parts of the IEC 61869 series will be published, these two standards are still in force.

The text of this International Standard is based on the following documents:
FDIS Report on voting
38/549/FDIS 38/552/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard is Part 11 of IEC 61869, published under the general title Instrument
transformers.
This Part 11 is to be read in conjunction with, and is based on, IEC 61869-1:2007, General
requirements and IEC 61869-6:2016, Additional general requirements for low-power
instrument transformers – however, the reader is encouraged to use the most recent edition of
these documents.
This Part 11 follows the structure of IEC 61869-1:2007 and IEC 61869-6:2016 and
supplements or modifies the corresponding clauses.
When a particular subclause of Part 1 or Part 6 is not mentioned in this part Part 11, that
subclause applies. When this standard states “addition”, “modification” or “replacement”, the
relevant text in Part 1 or Part 6 is to be adapted accordingly.
For additional clauses, subclauses, figures, tables, annexes or notes, the following numbering
system is used:
– clauses, subclauses, tables, figures and notes that are numbered starting from 1101 are
additional to those in Part 1 and Part 6;
– additional annexes are lettered 11A, 11B, etc.
An overview of the planned set of standards at the date of publication of this document is
given below. The updated list of standards issued by IEC TC 38 is available at the website:
www.iec.ch.
– 6 – IEC 61869-11:2017 © IEC 2017
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
IEC 61869-2 ADDITIONAL REQUIREMENTS FOR IEC 60044-1
CURRENT TRANSFORMERS
IEC 60044-6
IEC 61869-3 ADDITIONAL REQUIREMENTS FOR IEC 60044-2
INDUCTIVE VOLTAGE
TRANSFORMERS
IEC 61869-4 ADDITIONAL REQUIREMENTS FOR IEC 60044-3
COMBINED TRANSFORMERS
IEC 61869-5 ADDITIONAL REQUIREMENTS FOR IEC 60044-5
IEC 61869-1
CAPACITIVE VOLTAGE
GENERAL
TRANSFORMERS
REQUIREMENTS
IEC 61869-6 IEC 61869-7 ADDITIONAL REQUIREMENTS FOR IEC 60044-7
ELECTRONIC VOLTAGE
ADDITIONAL
TRANSFORMERS
GENERAL
REQUIREMENTS IEC 61869-8 SPECIFIC REQUIREMENTS FOR IEC 60044-8
FOR LOW-POWER
ELECTRONIC CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
IEC 61869-9 DIGITAL INTERFACE FOR
INSTRUMENT TRANSFORMERS
IEC 61869-10 ADDITIONAL REQUIREMENTS FOR
LOW-POWER PASSIVE CURRENT
TRANSFORMERS
IEC 61869-11 ADDITIONAL REQUIREMENTS FOR IEC 60044-7
LOW-POWER PASSIVE VOLTAGE
TRANSFORMERS
IEC 61869-12 ADDITIONAL REQUIREMENTS FOR
COMBINED ELECTRONIC
INSTRUMENT TRANSFORMER OR
COMBINED LOW-POWER PASSIVE
INSTRUMENT TRANSFORMERS
IEC 61869-13 STAND-ALONE MERGING UNIT
IEC 61869-14 ADDITIONAL REQUIREMENTS FOR
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
IEC 61869-15 ADDITIONAL REQUIREMENTS FOR
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this 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.
INTRODUCTION
Low-power passive voltage transformers are based on the voltage divider principle. They can
be built for example as resistive dividers, capacitive dividers or resistive-capacitive dividers.
Annex 11C shows the schematic diagram of the different dividers.
According to a general block diagram given in Figure 601 of IEC 61869-6:2016, the low-power
passive voltage transformers do not use an active primary converter (i.e. without any active
electronic component); therefore, there is no need for primary power supply. Additionally,
neither the secondary converter nor the secondary power supply is used.
The general block diagram of a low-power passive voltage transformer is given in
Figure 1101.
The applied technology decides which part is necessary for the realization of a low-power
passive voltage transformer, i.e. it is not necessary that the transmitting cable or primary
converter described in Figure 1101 be included in the low-power passive voltage transformer.
Passive a
A
Primary
Transmitting
primary
voltage sensor
cable
N converter n
IEC
Figure 1101 – General block diagram of a single-phase low-power
passive voltage transformer
– 8 – IEC 61869-11:2017 © IEC 2017
INSTRUMENT TRANSFORMERS –
Part 11: Additional requirements for low-power
passive voltage transformers
1 Scope
This part of IEC 61869 is a product standard and covers only additional requirements for low-
power passive voltage transformers (passive LPVT). The product standard for low-power
passive voltage transformers is composed of IEC 61869-1, along with IEC 61869-6 and this
document with specific requirements.
This document is applicable to newly manufactured low-power passive voltage transformers
with analogue output having rated frequencies from 15 Hz to 100 Hz for use with electrical
measuring instruments or electrical protective devices.
This document covers low-power passive voltage transformers used for measurement or
protection and low-power passive voltage transformers used for both measurement and
protection.
Low-power passive voltage transformers have analogue output only (for digital output or for
technology using any kind of active electronic components refer to future IEC 61869-7 ). Such
low-power passive voltage transformers can include the secondary signal cable (transmitting
cable). The secondary voltage of the low-power passive voltage transformer is proportional to
the primary voltage. Derivative output signals are not within the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
Clause 2 of IEC 61869-6:2016 is applicable with the following additions:
IEC 61869-6:2016, Instrument transformers – Part 6: Additional general requirements for low-
power instrument transformers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61869-1 and
IEC 61869-6 apply with the following additions and modifications:
3.1 General definitions
3.1.613
transmitting system
Definition 3.1.613 of IEC 61869-6:2016 is applicable with the following addition:
____________
Under preparation.
Note 1101 to entry: For low-power passive voltage transformers the transmitting system is just a transmitting
cable.
3.1.621
output signal
Definition 3.1.621 of IEC 61869-6:2016 is applicable with the following modification:
Note 1 to entry: In an electrically steady-state condition, the output signal is defined by the following equation:
u (t) = U 2 sin(2πft + ϕ ) + u (t)
s s s sres
where
u (t) is the output signal in steady state condition;
s
U is the RMS value of secondary voltage, when u (t) = 0;
s s res
f is the fundamental frequency;
ϕ is the secondary phase;
s
u (t) is the secondary residual voltage including harmonic, sub-harmonic and interharmonic components;
s res
t is the instantaneous value of the time;
f, U , ϕ are constant for steady-state condition.
s s
3.1.1101
voltage divider
device comprising resistors, inductors, capacitors (or a combination of these components)
such that, between two points of the device, a desired fraction of the voltage applied to the
device as whole can be obtained
[SOURCE: IEC 60050-312:2001, 312-02-32, modified – transformer deleted]
3.1.1102
high-voltage resistor
R
resistor connected between the high-voltage terminal and the intermediate-voltage secondary
terminal of a voltage divider
3.1.1103
high- voltage capacitor
C
capacitor connected between the high-voltage terminal and the intermediate-voltage
secondary terminal of a voltage divider
[SOURCE: IEC 60050-436:1990, 436-02-12]
3.1.1104
low- voltage resistor
R
resistive part of an R- or RC-divider between the secondary terminals
3.1.1105
low-voltage capacitor
C
capacitive part of a C- or RC-divider between the secondary terminals
3.1.1106
voltage limitation device
device connected in parallel to the secondary terminals to limit overvoltage

– 10 – IEC 61869-11:2017 © IEC 2017
3.2 Definitions related to dielectric ratings and voltages
3.2.1101
rated voltage factor
F
V
multiplying factor to be applied to the rated primary voltage to determine the maximum voltage
at which a transformer must comply with the relevant thermal requirements for a specified
time and with the relevant accuracy requirements
[SOURCE: IEC 60050-321:1986, 321-03-12]
3.4 Definitions related to accuracy
3.4.3
ratio error
ε
Definition 3.4.3 of IEC 61869-1:2007 is applicable with the following addition:
Note 1101 to entry: The ratio error, expressed in percent, is given by the following formula:
K ⋅U − U
r s p
ε = ×100 %
U
p
where
K is the rated transformation ratio;
r
U is the RMS value of the primary voltage;
p
U is the RMS value of the secondary voltage.
s
This definition is only related to the rated frequency component of both the primary and secondary signal.
3.4.602
rated delay time
t
dr
Not applicable.
3.4.1101
ratio correction factor
CF
U
factor by which the rated transformation ratio evaluated at rated burden and rated frequency
of an individual passive LPVT is to be multiplied to achieve the specified accuracy class
3.4.1102
corrected transformation ratio
K
cor
individual transformation ratio of a passive LPVT
Note 1 to entry: The relationship between the corrected transformation ratio and the rated ratio correction factor
is:
K = CF ⋅ K
cor U r
3.4.1103
phase offset correction
ϕ
o cor
value to be added to the rated phase offset evaluated at rated burden and rated frequency of
an individual passive LPVT to achieve the specified accuracy class

3.4.1104
corrected phase offset
φ
cor φo
individual phase offset of a passive LPVT
Note 1 to entry: The relationship between corrected phase offset and phase offset correction is:
ϕ =ϕ +ϕ
cor o or
ϕo cor
3.4.1105
corrected ratio error
ε
cor U
ratio error of an individual passive LPVT corrected by the factor defined in 3.4.1102
Note 1 to entry: The corrected ratio error is calculated by the formula:
CF ⋅ K ⋅ U − U
U r s p
ε (%)= ×100
cor
U
U
p
where
CF is the ratio correction factor of the individual passive LPVT.
U
3.4.1106
corrected phase error
φ
e cor
phase error of an individual passive LPVT corrected by the value defined in 3.4.1104
Note 1 to entry: The corrected phase error is given by the formula:
ϕ =ϕ −ϕ −ϕ
e s p cor
cor ϕo
3.7 Index of abbreviations and symbols
Subclause 3.7 of IEC 61869-1:2007 is replaced by the following:
C high-voltage capacitor of a divider
C low-voltage capacitor of a divider
CF
correction factor
U
F mechanical load
f rated frequency
r
F rated voltage factor
V
K actual transformation ratio
K corrected transformation ratio
cor
K rated transformation ratio
r
LPIT low-power instrument transformer
LPVT low-power voltage transformer
R high-voltage resistor of a divider
R low-voltage resistor of a divider
R rated burden
br
U highest voltage for equipment
m
U
rated primary voltage
pr
– 12 – IEC 61869-11:2017 © IEC 2017
U rated secondary voltage
sr
U highest voltage for system
sys
ratio error
ε
ε corrected ratio error
cor U
instantaneous voltage error for transient conditions
ε (t)
U
ϕ phase error
e
ϕ phase offset
o
ϕ phase offset correction
o cor
ϕ rated phase offset
or
Δϕ phase displacement
φ corrected phase error
e cor
φ corrected phase offset
cor φo
5 Ratings
5.3 Rated insulation levels and voltages
5.3.5 Insulation requirements for secondary terminals
Subclause 5.3.5 of IEC 61869-6:2016 is applicable with the following addition:
For rated secondary voltage > 10 V the test voltage is 3 kV regardless of the cable length.
5.3.601 Rated auxiliary power supply voltage (U )
ar
Not applicable.
5.5 Rated output
5.5.601 Rated burden (R )
br
Subclause 5.5.601 of IEC 61869-6:2016 is applicable with the following addition:
The cable included in the LPVT shall not be changed/modified in order to preserve the
specified characteristics of the device.
5.5.602 Standard values for rated delay time (t )
dr
Not applicable.
5.6 Rated accuracy class
5.6.1101 Accuracy based on the rated transformation ratio and rated phase offset
Ratio error ε is calculated according to the formula in Note 1101 of definition 3.4.3. No
correction for individual characteristics of the passive LPVT is done.
5.6.1102 Accuracy based on individual corrected transformation ratio and corrected
phase offset
As alternative to the accuracy based on the rated transformation ratio and rated phase offset,
for passive LPVT the compliance to the accuracy class can be based on the individual

corrected transformation ratio or individual ratio correction factor and the individual corrected
phase offset or individual phase offset correction.
Corrected ratio error ε is calculated according to the formula in Note 1 of definition
cor U
3.4.1105. The correction factor CF shall be in the range of 0,900 to 1,100 and specified with
U
the suitable accuracy and number of decimals according to the relevant accuracy class (with a
minimal resolution of 0,001).
The corrected phase error is calculated according to the formula in Note 1 of definition
3.4.1106. For passive LPVT the individual corrected phase offset φ replaces the rated
cor φo
phase offset φ . Since rated delay time for passive LPVT is not applicable, φ is zero. The
or tdr
phase offset correction shall be in the range of ± 300 min and specified with the suitable
accuracy and number of decimals according to the relevant accuracy class (with a minimal
resolution of 1 min).
If the accuracy is based on the individual correction, the correction factors or the corrected
transformation ratio and the corrected phase offset shall be indicated on the rating plate.
Additional information on the designation of the accuracy class using the corrected
transformation ratio and the ratio correction factor is given in Annex 11B.
5.6.1103 Accuracy requirements for measuring low-power passive voltage
transformer
5.6.1103.1 Accuracy class designation
For measuring passive LPVT, the accuracy class is designated by the highest permissible
percentage of the ratio error at rated primary voltage and with rated burden.
5.6.1103.2 Standard accuracy classes
The standard accuracy classes for metering low-power passive voltage transformers are:
0,1 – 0,2 – 0,5 – 1,0 – 3,0
5.6.1103.3 Limits of ratio error and phase error
The ratio error and phase error shall not exceed the values given in Table 1101 for the
appropriate accuracy class at any voltage between 80 % and 120 % of the rated voltage and
at any value of temperature and frequency within the reference ranges and connected to a
burden within the range of:
– ± 5 % of the resistive part of rated burden, and
– between 0 % and 100 % of the capacitive part of the rated burden.
Table 1101 – Limits of ratio error and phase error for measuring LPVT
Accuracy Percentage Phase error φ φ
e, cor φo
class ratio error ε, ε
cor U
±
Minutes Centiradians
± %
at voltage (% of rated) at voltage (% of rated) at voltage (% of rated)
80 100 120 80 100 120 80 100 120
0,1 0,1 0,1 0,1 5 5 5 0,15 0,15 0,15
0,2
0,2 0,2 0,2 10 10 10 0,3 0,3 0,3
0,5 0,5 0,5 0,5 20 20 20 0,6 0,6 0,6
1,0 1,0 1,0 1,0 40 40 40 1,2 1,2 1,2
3,0 3,0 3,0 3,0
Not specified Not specified
– 14 – IEC 61869-11:2017 © IEC 2017
5.6.1103.4 Accuracy requirements on harmonics
If there are requirements for harmonics, the accuracy requirements on harmonics, given in
Annex 6A of IEC 61869-6:2016, are applicable even though the improvement of the relevant
test procedures given there is under consideration by IEC TC38.
5.6.1104 Accuracy requirements for protective and multipurpose low-power passive
voltage transformers
5.6.1104.1 Accuracy class designation
The accuracy class for a protective and multipurpose low-power passive voltage transformer
is designated by the highest permissible percentage of the ratio error specified for the
accuracy class concerned, from 2 % of rated voltage to a voltage corresponding to the rated
voltage factor (see 5.1102) followed by the letter “P”.
5.6.1104.2 Standard accuracy classes
The standard accuracy classes for:
– multipurpose low-power passive voltage transformers are "0,1P", "0,2P”, "0,5P" and "1P"
– protective low-power passive voltage transformers are "3P" and "6P“.
Multipurpose low-power voltage transformers with their extended range of accuracy are
generally suitable for residual voltage measurement based on the sum of the three-phase
voltages.
5.6.1104.3 Limits of ratio error and phase error
The ratio error and phase error shall not exceed the values given in Table 1102 for the
appropriate accuracy class at any value of temperature and frequency within the reference
ranges and connected to a burden within the range of:
– ± 5 % of the resistive part of rated burden, and
– between 0 % and 100 % of the capacitive part of the rated burden.
Table 1102 – Limits of ratio error and phase error for protection and multipurpose LPVT
Accura
Ratio error ε, ε Phase error φ , φ
cor U e cor φo
cy
class ± % ± minutes ± centiradiants
at voltage (% of rated) at voltage (% of rated) at voltage (% of rated)
F F F
v v v
2 20 80 100 2 20 80 100 2 20 80 100

x100 x100 x100
0,1P 0,5 0,2 0,1 0,1 0,1 20 10 5 5 5 0,6 0,3 0,15 0,15 0,15
0,2P 1 0,4 0,2 0,2 0,2 40 20 10 10 10 1,2 0,6 0,3 0,3 0,3
0,5P 2 1 0,5 0,5 0,5 80 40 20 20 20 2,4 1,2 0,6 0,6 0,6
1P 4 2 1 1 1 160 80 40 40 40 4,8 2,4 1,2 1,2 1,2
3P 6 3 3 3 3 240 120 120 120 120 7 3,5 3,5 3,5 3,5
6P 12 6 6 6 6 480 240 240 240 240 14 7 7 7 7
The accuracy class shall be defined in accordance with the relay manufacturer's sizing rules and application
requirements. LPVT accuracy class 0,1P could be recommended for power systems earthed with Petersen coil
while LPVT with accuracy classes 0,2P or 0,5P could be used for other earthing systems.

5.1101 Standard values of rated voltages
5.1101.1 Rated primary voltages U
pr
The standard values of the rated primary voltage of a low-power passive voltage transformer
connected between one line of a three-phase system and earth shall be 1/√3 times the values
of the rated system voltage.
Preferred values are given in IEC 60038.
A range of rated primary voltages can be assigned to an LPVT. In this case the accuracy
specification is applicable to the assigned primary voltage range, and the voltage factor F is
V
applied to the highest value of this range.
NOTE The performance of a low-power passive voltage transformer as a measuring or protection transformer is
based on the rated primary voltage U whereas the rated insulation level is based on the highest voltages for
pr
equipment U .
m
5.1101.2 Rated secondary voltages U
sr
The standard RMS values of rated secondary voltage U are:
sr
3,25/√3 V, 100/√3 V
For LPVT used for a range of rated primary voltages, the rated secondary voltage has to
correspond to one of the rated primary voltages, or alternatively a rated transformation ratio
(e.g. 10ˈ000/1) may be used.
5.1102 Standard values of rated voltage factor F
V
The voltage factor is determined by the maximum operating voltage which, in turn, is
dependent on the system earthing conditions.
The standard voltage factors appropriate to the different earthing conditions are given in
Table 1103, together with the permissible duration of maximum operating voltage (i.e. rated
time).
Table 1103 – Standard values of rated voltage factors
Rated voltage
Method of connecting the primary terminal
factor
Rated time
and system earthing conditions
F
V
1,2 Continuous Between phase and earth in an effectively
earthed neutral system (3.2.7 a) of IEC 61869-1:2007)
1,5 30 s
1,2 Continuous Between phase and earth in a non-effectively earthed
neutral system (3.2.7 b) of IEC 61869-1:2007) with automatic earth-fault
1,9 30 s
tripping.
1,2 Continuous Between phase and earth in an isolated neutral system (3.2.4 of
IEC 61869-1:2007)
1,9 8 h
without automatic earth-fault tripping or in a resonant earthed
system (3.2.5 of IEC 61869-1:2007) without automatic earth-fault tripping.
Reduced rated times are permissible by agreement between manufacturer and user.
The maximum operating voltage of an LPVT shall be lower than or equal to the highest voltage for equipment
U /√3 or the rated primary voltage U multiplied by the rated voltage factor 1,2 for continuous service, whichever
m pr
is the lowest.
– 16 – IEC 61869-11:2017 © IEC 2017
6 Design and construction
6.11 Electromagnetic compatibility (EMC)
6.11.3 Requirements for immunity
Not applicable.
6.11.601 Emission requirements
Subclause 6.11.601 of IEC 61869-6:2016 is applicable with the following additions:
As a consequence, no further emission requirement is specified for passive LPCT in addition
to Radio Interface Voltage (RIV) test and Transmitted Overvoltage (TOV) test.
6.13 Markings
6.13.1101 Terminal markings – General rules
The markings shall identify
a) the primary and secondary terminals;
b) the relative polarities of terminals.
6.13.1102 Method of marking
The primary terminals shall be marked clearly and indelibly, either on their surface or in their
immediate vicinity. If possible, the secondary terminals shall be identified clearly and
indelibly, either on the surface of the passive LPVT or in case of integrated cable with
connector, in the immediate vicinity of the connector. If not possible, the manufacturer shall in
any case provide relevant information in the product documentation.
The marking shall consist of letters followed or preceded, where necessary, by numbers.
6.13.1103 Terminal markings
Terminal markings shall be in accordance with Figure 1102.
A
C
R
a
R
C
n
N
IEC
Figure 1102 – Terminal markings
for passive LPVT
NOTE For other types of LPVT, see Annex 11C.

6.13.1104 Rating plate markings
In addition to those markings defined in IEC 61869-1:2007, 6.13, and IEC 61869-6:2016,
6.13, all low-power passive voltage transformers shall carry the following rating plate
markings:
a) the rated primary and secondary voltage (e.g. 20/√3 kV / 3,25/√3 V) or if applicable the
rated transformation ratio (e.g. 10 000/1);
b) the range of rated primary voltages if applicable (e.g. 10/√3 kV to 30/√3 kV);
c) the rated voltage factor and corresponding rated time (e.g. F = 1,9 /8 h);
V
d) the serial number of capacitor units if applicable (e.g. in high-voltage application);
e) primary and secondary resistance and capacitance (for U ≥ 72,5 kV);
m
f) rated burden and accuracy class based on the rated and the corrected transformation
ratio, if applicable;
EXAMPLE 1 2 MΩ/50 pF class 0,2 for measuring passive LPVT.
EXAMPLE 2 2 MΩ/50 pF class 3P for protective passive LPVT.
g) the ratio correction factor or the corrected transformation ratio, if needed for the declared
accuracy class (e.g. CF = 0,965 or K = 10 005 V/V);
U cor
h) rated phase offset (e.g. ϕ = 0°);
or
i) the phase offset correction, or the corrected phase offset if needed for the declared
accuracy class (e.g. ϕ = 52 min or ϕ = 52 min).
c
o cor or φo
6.601 Requirements for optical transmitting system and optical output link
Not applicable.
6.602 Requirements for electrical transmitting system and electrical wires for output
link
6.602.1 Connectors
Subclause 6.602.1 of IEC 61869-6:2016 is applicable with the following addition:
Pin assignment for passive LPVT using connector type RJ45 is given in Table 1104.
Table 1104 – Pin assignment for RJ45 connectors used in passive LPVT
RJ 45 connector for: Pin: 1 2 3 4 5 6 7 8
Passive LPVT    a n
Reserved for LPCT S1 S2
Reserved for TEDS  +  -
Reserved for power supply  + -

For secondary voltages > 10 V the following connections shall be used:
– screwed terminals
– coaxial or triaxial connector plugs or sockets, with terminal “a” in the central conductor
NOTE In case of more than one secondary output each output signal is connected with a separate cable and
connector.
6.603 Signal-to-noise ratio
Not applicable.
– 18 – IEC 61869-11:2017 © IEC 2017
6.604 Failure detection and maintenance announcement
Not ap
...