IEC 60700-1:1998/AMD2:2008

IEC 60700-1
Edition 1.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Thyristor valves for high voltage direct current (HVDC) power transmission –
Part 1: Electrical testing

Valves à thyristors pour le transport d'énergie en courant continu à haute
tension (CCHT) –
Partie 1: Essais électriques

IEC 60700:1998/A2:2008

---------------------- Page: 1 ----------------------
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IEC 60700-1
Edition 1.0 2008-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Thyristor valves for high voltage direct current (HVDC) power transmission –
Part 1: Electrical testing

Valves à thyristors pour le transport d'énergie en courant continu à haute
tension (CCHT) –
Partie 1: Essais électriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
J
CODE PRIX
ICS 29.200; 31.080.20 ISBN 2-8318-9955-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – 60700-1 Amend. 2 © IEC:2008
FOREWORD
This amendment has been prepared by subcommittee 22F: Power electronics for electrical
transmission and distribution systems, of IEC technical committee 22: Power electronic
systems and equipment.
The text of this amendment is based on the following documents:
CDV Report on voting
22F/154/CDV 22F/164/RVC

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.
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

_____________

Page 3
CONTENTS
On page 7, replace the title of Clause 13 by the following:
13 Testing of special features and fault tolerance
Delete Annex C.

Page 11
2 Normative references
Replace the fourth reference by the following:
IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules
Replace the sixth reference by the following:
IEC 60270:2000, High-voltage test techniques – Partial discharge measurements

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60700-1 Amend. 2 © IEC:2008 – 3 –
Page 15
3.2 Valve construction terms
Add the following term and definition after 3.2.6 (introduced by Amendment 1):
3.2.7
multiple valve unit
MVU
single physical structure comprising more than one valve with a common mechanical support
structure

Page 19
4.2 Atmospheric correction
Replace the first dash by the following:
– pressure:
a) If the insulation coordination of the tested part of the thyristor valve is based on standard
rated withstand voltages according to IEC 60071-1, correction factors are only applied for
altitudes exceeding 1 000 m. Hence, if the altitude of the site a at which the equipment
s
=101,3 kPa)
will be installed is ≤1 000 m, then the standard atmospheric air pressure (b
0
shall be used with no correction for altitude. If a >1 000 m, then the standard procedure
s
according to IEC 60060-1 is used except that the reference atmospheric pressure b is
0
replaced by the atmospheric pressure corresponding to an altitude of 1 000 m (b ).
1 000 m
b) If the insulation coordination of the tested part of the thyristor valve is not based on
standard rated withstand voltages according to IEC 60071-1, then the standard procedure
according to IEC 60060-1 is used with the reference atmospheric pressure b
0
(b =101,3 kPa);
0
4.4 Criteria for successful type testing
In the first line, replace “ascertains that” by “shows that”.

Page 21
4.4.1 Criteria applicable to thyristor levels
In item c), insert the word “programme” at the end of the sentence.
In item f), the second dashed item, insert the words “where applicable” at the end of the
sentence.
In item f), the fourth dashed item, insert the words “where applicable” at the end of the
sentence.

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– 4 – 60700-1 Amend. 2 © IEC:2008
Page 23
Tableau 2 – List of type tests
Replace, in the last line, “Testing of special features” by “Testing of special features and fault
tolerance”.

Page 27
6.3.2 Valve support a.c. voltage test
Delete the first paragraph.
6.3.3 Valve support switching impulse test
Replace the first paragraph by the following:
The test shall comprise three applications of positive polarity and three applications of
negative polarity switching impulse voltages between the main terminals, which are in
common, and earth.

Page 29
6.3.4 Valve support lightning impulse test
Replace the first paragraph by the following:
The test shall comprise three applications of positive polarity and three applications of
negative polarity lightning impulse voltages between the main terminals, which are in common,
and earth.

Page 31
7.3.2 MVU a.c. voltage test
In the second paragraph, delete the first sentence.
In the third paragraph, second line, replace the sentence by the following:
…raised to the specified 1 min test voltage in approximately 10 s, kept constant…
In the fourth paragraph, replace the first sentence by the following:
During the last 1 min of the specified 30 min test, the level of partial discharge shall be
monitored and recorded.

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60700-1 Amend. 2 © IEC:2008 – 5 –
Page 39
8.3.2 Valve a.c. voltage test
Delete the first paragraph.
In the second paragraph, replace the last two sentences by the following:
During the last 1 min of the specified 30 min test, the level of partial discharge shall be
monitored and recorded. The value of partial discharge shall not exceed 200 pC (see
Annex B).
In the line before the note, replace the sentence by the following:
k   = 1,10.
8

Page 43
8.3.6 Valve steep front impulse test
In the third paragraph after the note, replace the formula by the following:
U = ± STIPL × k
tsfv v 12
Replace the sentence in the second line after the equation by the following:
STIPL  is the steep front impulse protective level of the valve arrester as determined by the
v
coordinating current from system studies;

Page 49
9.3 Test requirements
Add, on page 51, at the end of the last paragraph, the following sentence:
If less than three items of a type of component are installed in a valve, all components of this
type in the valve shall be monitored.

Page 57
9.3.4 Temporary undervoltage test
Replace, in the second line of the second paragraph, the words "…steady-state α …" by
min
the words "…steady-state minimum α…".
Replace, in the third line of the second paragraph, the words "…at transient α …" by the
min
words "…at minimum transient value of α…".

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– 6 – 60700-1 Amend. 2 © IEC:2008
Page 61
10.3 Test requirements
Replace, in the third line of the second paragraph, the words "…steady-state γ " by the
min
words "…steady-state minimum γ”.

Page 63
11.1 Purpose of tests
Add, to item b), the following sentence at the end of the paragraph:
This test covers the – normally rare – case where phase shifts or transients in the AC system
prevent the conditions needed for the valve to block the fault at the end of the first cycle.

Page 65
11.3.1 One-loop fault current test with re-applied forward voltage
Replace, in the second paragraph, the existing equation by the following:
U = U × 2× k × k × k
tfvd v0max n r 17
Replace, after the equation, the explanation of U by the following:
v0m
U is the maximum steady-state no-load phase-to-phase voltage on the valve side of
v0max
the transformer;
th
Replace, in the third paragraph, the 4 dashed item by the following:
– the most critical of the following combinations:
– the lowest delay angle at fault initiation corresponding to the maximum steady-state
operating voltage referred to the valve side,
– the lowest operating voltage referred to the valve side at fault initiation corresponding
to the minimum transient delay angle;
th
Delete, in the third paragraph, the 6 dashed item.

---------------------- Page: 8 ----------------------
60700-1 Amend. 2 © IEC:2008 – 7 –
Page 67
11.3.2 Multiple-loop fault current test without re-applied forward voltage
Replace, in the third paragraph, the existing equation by the following:
U = U × 2sin ψ × k × k × k
tfvr v0max n r 18
Replace, after the equation, the explanation of U by the following:
v0m
U is the maximum steady-state no-load phase-to-phase voltage on the valve side of
v0max
the transformer;

Page 69
12.1 Purpose of tests
Replace, in the second paragraph, the text “8.3.3 to 8.3.6” in the second line by the following:
“8.3.3 to 8.3.5”.
Add the following new text at the end of the last sentence of the second paragraph:
…because the events reproduced by these tests can be expected during normal operation of
the converter station and do not normally cause the converter station to be tripped.

Page 71
13 Testing of special features
Replace the title of Clause 13 by the following:
13 Testing of special features and fault tolerance
Replace the existing text of 13.1 by the following:
13.1.1 General
These tests are intended to verify the design and performance of any special features of the
valve. Special features may include, but are not limited to, those in the following two
categories.
13.1.2  Circuits to facilitate the proper control, protection and monitoring of the valve
Generally, these features can be demonstrated as part of the other tests.
13.1.3  Features included in the valve to provide fault tolerance
Fault tolerance capability may be defined as the ability of an HVDC thyristor valve to perform
its intended function, until a scheduled shutdown, with faulted components or subsystems or

---------------------- Page: 9 ----------------------
– 8 – 60700-1 Amend. 2 © IEC:2008
overloaded components, and not lead to any unacceptable failure of other components, or
extension of the damage due to the faulted condition. Special features may be required in the
design to ensure fault tolerance. Examples of faults for which fault tolerance may be required
include, but are not limited to, those given below.
a) Short circuit of a thyristor
Even though a short-circuited thyristor will shunt the other components at the thyristor level,
in some designs there may be a danger of overloading gate pulse transformers, overloading
of current connections (where parallel thyristors are used), or changing the clamping load.
b) Continuous operation of protective firing at one thyristor level due to loss of normal firing
pulses to that level
Continuous operation of protective firing can lead to overload of the damping resistor and
other components at the affected level.
c) Insulation failure of a pulse transformer (if feeding two or more series-connected
thyristors), damping capacitor, damping resistor or grading capacitor
Insulation failure of any component in parallel with the thyristors can attract load current into it,
le
...