IEC 60700-3:2022

Thyristor valves for high voltage direct current (HVDC) power transmission - Part 3: Essential ratings (limiting values) and characteristics

IEC 60700-3:2022 specifies the service conditions, the definitions of essential ratings and characteristics of thyristor valves utilized in line commutated converters with three-phase bridge connections to realize the conversion from AC to DC and vice versa for high voltage direct current (HVDC) power transmission applications. It is applicable for air insulated, liquid cooled and indoor thyristor valves.

Valves à thyristors pour le transport d’énergie en courant continu à haute tension (CCHT) - Partie 3: Valeurs assignées (valeurs limites) et caractéristiques essentielles

L’IEC 60700-3:2022 spécifie les conditions d’emploi, les définitions des valeurs assignées et des caractéristiques essentielles des valves à thyristors utilisées dans les convertisseurs commutés par le réseau avec des montages en pont triphasés pour réaliser la conversion du courant alternatif en courant continu et inversement pour des applications de transport d’énergie en courant continu à haute tension (CCHT). Elle s’applique aux valves à thyristors isolées par air, refroidies par un liquide et en intérieur.

General Information

• Status: Published
• Publication Date: 28-Nov-2022
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: SC 22F - Power electronics for electrical transmission and distribution systems
• Drafting Committee: WG 35 - TC 22/SC 22F/WG 35
• Current Stage: PPUB - Publication issued
• Start Date: 02-Jan-2023
• Completion Date: 29-Nov-2022

Standards Content (Sample)

IEC 60700-3
®

Edition 1.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Thyristor valves for high voltage direct current (HVDC) power transmission –
Part 3: Essential ratings (limiting values) and characteristics

Valves à thyristors pour le transport d’énergie en courant continu à haute
tension (CCHT) –
Partie 3: Valeurs assignées (valeurs limites) et caractéristiques essentielles

IEC 60700-3:2022-11(en-fr)

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60700-3

®


Edition 1.0 2022-11




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Thyristor valves for high voltage direct current (HVDC) power transmission –

Part 3: Essential ratings (limiting values) and characteristics



Valves à thyristors pour le transport d’énergie en courant continu à haute

tension (CCHT) –

Partie 3: Valeurs assignées (valeurs limites) et caractéristiques essentielles















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.200 ISBN 978-2-8322-6121-7




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – IEC 60700-3:2022 © IEC 2022
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Symbols and abbreviated terms . 8
3.2.1 General . 8
3.2.2 Subscripts . 8
3.2.3 Letter symbols . 8
3.2.4 Abbreviated terms . 9
4 Service conditions . 9
4.1 General . 9
4.2 Environmental conditions . 9
4.2.1 Site altitude . 9
4.2.2 Air temperature and humidity range in valve halls . 9
4.2.3 Cleanness in valve halls . 10
4.2.4 Seismic conditions . 10
4.3 System conditions . 10
4.3.1 General information of the system . 10
4.3.2 AC system voltage . 10
4.3.3 AC system frequency . 10
4.3.4 DC system voltage . 10
4.3.5 DC system current and overload requirements . 11
4.3.6 Short circuit current requirements for thyristor valves . 11
4.3.7 Insulation coordination design related to thyristor valves . 11
4.4 Technical parameters for six-pulse bridge design . 11
4.4.1 General . 11
4.4.2 Voltage parameters . 11
4.4.3 Current parameters. 12
4.4.4 Valve arrester parameters . 13
4.4.5 Other system parameters. 13
4.5 Other conditions. 14
5 Ratings . 14
5.1 Voltage and current ratings (limiting values) . 14
5.1.1 Rated AC voltage across valve (U ) . 14
v0N
5.1.2 Maximum steady state AC voltage across valve (U ) . 14
v0max
5.1.3 Maximum temporary state AC voltage across valve (U ) . 14
v0maxT
5.1.4 Minimum steady state AC voltage across valve (U ) . 15
v0min
5.1.5 Minimum temporary state AC voltage across valve (U ) . 15
v0minT
5.1.6 Valve repetitive peak off-state voltage (U ) . 15
vDRM
5.1.7 Valve non-repetitive peak off-state voltage (U ) . 15
vDSM
5.1.8 Valve repetitive peak reverse voltage (U ) . 15
vRRM
5.1.9 Valve non-repetitive peak reverse voltage (U ) . 15
vRSM
5.1.10 Valve switching impulse withstand voltage (SIWV ) . 15
v

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IEC 60700-3:2022 © IEC 2022 – 3 –
5.1.11 Valve lightning impulse withstand voltage (LIWV ) . 16
v
5.1.12 Valve steep front impulse withstand voltage (STIWV ) . 16
v
5.1.13 Valve switching impulse protective firing voltage (SIPL ) . 16
PF
5.1.14 Valve RMS current (I ) . 16
v(RMS)
5.1.15 Valve average current (I ) . 16
v(av)
5.1.16 Valve one-loop fault current with re-applied forward voltage (I ) . 16
SCα
5.1.17 Valve multiple-loop fault current without re-applied forward voltage
(I ) . 17
SCβ
5.2 Delay and extinction angle ratings (limiting values) . 17
5.2.1 Rated firing delay angle (α ) . 17
N
5.2.2 Minimum allowable firing delay angle (α ) . 17
min
5.2.3 Maximum allowable firing delay angle (α ) . 17
max
5.2.4 Minimum temporary state firing delay angle (α ) . 17
minT
5.2.5 Rated extinction angle (γ ) . 17
N
5.2.6 Minimum allowable extinction angle (γ ). 17
min
5.2.7 Maximum allowable extinction angle (γ ) . 17
max
5.2.8 Minimum temporary state extinction angle (γ ) . 17
minT
5.3 Insulation and test voltage levels (limiting values) . 18
5.3.1 Maximum DC voltage between valve terminals (U ) . 18
d(v)max
5.3.2 Maximum DC voltage across multiple valve unit (U ) . 18
d(m)max
5.3.3 Maximum DC voltage across valve support (U ) . 18
d(vs)max
5.3.4 Maximum AC voltage between valve terminals (U ) . 18
ac(v)max
5.3.5 Maximum AC voltage across multiple valve unit (U ) . 19
ac(m)max
5.3.6 Maximum AC voltage across valve support (U ) . 19
ac(vs)max
5.3.7 Maximum switching impulse voltage between valve terminals
(U ). 19
s(v)max
5.3.8 Maximum switching impulse voltage across multiple valve unit
(U ) . 19
s(m)max
5.3.9 Maximum switching impulse voltage across valve support (U ) . 20
s(vs)max
5.3.10 Maximum lightning impulse voltage between valve terminals (U ) . 20
l(v)max
5.3.11 Maximum lightning impulse voltage across multiple valve unit
(U ) . 20
l(m)max
5.3.12 Maximum lightning impulse voltage across valve support (U ) . 20
l(vs)max
5.3.13 Maximum steep front impulse voltage between valve terminals
(U ) . 20
st(v)max
5.3.14 Maximum steep front impulse voltage across multiple valve unit
(U ) . 21
st(m)max
5.3.15 Maximum steep front impulse voltage across valve support
(U ) . 21
st(vs)max
6 Characteristics . 21
6.1 General . 21
6.2 Losses characteristics . 21
6.2.1 General . 21
6.2.2 Maximum load loss per valve at rated condition (P ) . 21
vmax

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– 4 – IEC 60700-3:2022 © IEC 2022
6.2.3 Maximum no-load loss per valve (P ) . 22
v0max
6.2.4 Maximum heat emission to valve hall (P ) . 22
Emax
6.3 Protection characteristics . 22
6.3.1 Valve lightning impulse protective firing voltage (LIPL ) . 22
PF
6.3.2 Valve steep front impulse protective firing voltage (STIPL ) . 22
PF
6.3.3 Thyristor protective firing level (V ) . 22
PF
6.3.4 Thyristor forward recovery protection level (V ) . 22
RP
6.3.5 Thyristor forward du/dt protection level (du/dt ) . 22
PF
6.3.6 Valve protective firing trip level (N ) . 23
tripPF
6.3.7 Valve loss of redundancy trip level (N ) . 23
trip
6.4 Temperature characteristics . 23
6.4.1 Maximum cooling medium temperature at valve inlet (T ) . 23
(in)max
6.4.2 Maximum cooling medium temperature at valve outlet (T ) . 23
(out)max
6.4.3 Thyristor junction temperature at rated condition (T ) . 23
jN
6.4.4 Maximum thyristor junction temperature (T ) . 23
jmax
6.4.5 Storage temperature (T ) . 23
stg
6.5 Reliability characteristics . 23
6.5.1 General . 23
6.5.2 Expected annual failure rate of thyristor level (λ ) . 24
E
6.6 Other characteristics . 24
6.6.1 Valve on-state voltage (U ) . 24
v(on)
6.6.2 Maximum steady state operating time at α = 90° (t ) . 24
90max
6.6.3 Maximum temporary state operating time at α = 90° (t ) . 24
90maxT
6.6.4 Maximum steady state commutation overshoot factor (k ) . 24
c
6.6.5 Maximum temporary state commutation overshoot factor (k ) . 24
cT
Annex A (informative) Input parameters for thyristor valve design . 29
Annex B (informative) Technical data sheet of thyristor valves . 31
Bibliography . 34

Figure 1 – Typical arrester arrangement for converter units with two 12-pulse bridges
in series . 25
Figure 2 – Operating voltage of valve and valve arrester in rectified mode . 26
Figure 3 – Thyristor valve voltage waveforms in different operation modes . 26
Figure 4 – One loop valve short circuit current and voltage waveforms . 27
Figure 5 – Multiple loop valve short circuit current and voltage waveforms . 27
Figure 6 – Continuous operating voltages at various locations for a 12-pulse bridge in
rectifier mode . 28

Table A.1 – Main input parameters required for thyristor valve design . 29
Table B.1 – Technical data sheet of thyristor valves . 31

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IEC 60700-3:2022 © IEC 2022 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

THYRISTOR VALVES FOR HIGH VOLTAGE DIRECT CURRENT (HVDC)
POWER TRANSMISSION –

Part 3: Essential ratings (limiting values) and characteristics

FOREWORD
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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.
IEC 60700-3 has been prepared by subcommittee 22F: Power electronics for electrical
transmission and distribution systems, of IEC technical committee 22: Power electronic systems
and equipment. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
22F/667/CDV 22F/686/RVC

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

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– 6 – IEC 60700-3:2022 © IEC 2022
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all parts in the IEC 60700 series, published under the general title Thyristor valves for
high voltage direct current (HVDC) power transmission, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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IEC 60700-3:2022 © IEC 2022 – 7 –
THYRISTOR VALVES FOR HIGH VOLTAGE DIRECT CURRENT (HVDC)
POWER TRANSMISSION –

Part 3: Essential ratings (limiting values) and characteristics



1 Scope
This part of IEC 60700 specifies the service conditions, the definitions of essential ratings and
characteristics of thyristor valves utilized in line commutated converters with three-phase bridge
connections to realize the conversion from AC to DC and vice versa for high voltage direct
current (HVDC) power transmission applications. It is applicable for air insulated, liquid cooled
and indoor thyristor valves.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
IEC 60700-1:2015, Thyristor valves for high voltage direct current (HVDC) power
transmission – Part 1: Electrical testing
1
IEC 60700-1:2015/AMD1:2021
IEC 60700-2:2016, Thyristor valves for high voltage direct current (HVDC) power
transmission – Part 2: Terminology
IEC 61803:2020, Determination of power losses in high-voltage direct current (HVDC) converter
stations with line-commutated converters
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
___________
1
 There exists a consolidated edition 1.1 (2021) that comprises IEC 60700-1:2015 and its Amendment 1:2021.

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– 8 – IEC 60700-3:2022 © IEC 2022
3.2 Symbols and abbreviated terms
3.2.1 General
Clause 3.2 covers only the most frequently used symbols and abbreviated terms related to this
document. The documents listed in Clause 2 contain additional symbols and abbreviated terms.
3.2.2 Subscripts
0 (zero) at no load
i ideal
N nominal or rated value
d direct current or voltage
ac alternating current or voltage
r resistive or overvoltage
x inductive
u undervoltage
j thyristor junction
v valve or valve side of converter transformer
m multiple valve (unit)
vs valve support
s switching impulse or stray
l lightning impulse
st steep front impulse
PF protective firing
RP recovery protection
T temporary
S short term
SC short circuit
max maximum
min minimum
RMS root mean square
av average
ar arrester
DRM off-state repetitive maximum value
DSM off-state non-repetitive maximum value
RRM reverse repetitive maximum value
RSM reverse non-repetitive maximum value
3.2.3 Letter symbols
α (trigger/firing) delay angle
γ extinction angle
μ (commutation) overlap angle
X commutation circuit reactance, including leakage reactance of converter
t
transformer and other reactance in the commutation circuit which influence
commutation process

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IEC 60700-3:2022 © IEC 2022 – 9 –
P on-load losses of converter transformer and DC smoothing reactor when a six-pulse
cu
bridge is operating at rated load
equivalent resistance of the voltage drop of the thyristor valve
R
th
f rated AC system frequency
N
t valve conduction interval
p
t valve hold-off interval
G
k uneven voltage distribution factor, defined as the maximum deviation of the peak
df
voltages of thyristor levels in a valve under the specified type of impulses,
representing the degree of uneven voltage distribution due to tolerances of the
voltage divider components, stray capacitances and differences in recovery charge
of thyristors
3.2.4 Abbreviated terms
MVU multiple valve (unit)
SIPL switching impulse protective level
LIPL lightning impulse protective level
STIPL steep front impulse protective level
4 Service conditions
4.1 General
Thyristor valves shall be able to operate continuously and reliably under the specified service
conditions throughout their entire service life except for maintenance periods. Such conditions,
as the main input parameters for valve design, are essential to define the ratings and
characteristics of the thyristor valves, and should be specified by the purchaser or by the system
designer or the suppli
...