IEC 62823:2015/AMD1:2019

IEC 62823 ®
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Thyristor valves for thyristor controlled series capacitors (TCSC) – Electrical
testing
Valves à thyristors pour condensateurs série commandés par thyristors
(CSCT) – Essai électrique
IEC 62823:2015-08/AMD1:2019-12(en-fr)

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IEC 62823 ®
Edition 1.0 2019-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Thyristor valves for thyristor controlled series capacitors (TCSC) – Electrical

testing
Valves à thyristors pour condensateurs série commandés par thyristors

(CSCT) – Essai électrique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.240.99 ISBN 978-2-8322-7599-3

– 2 – IEC 62823:2015/AMD1:2019
© IEC 2019
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/518/CDV 22F/532/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 stability date indicated on the IEC website 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• withdrawn,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.
_____________
3.23
boost factor
Replace the words "divided by" by the word "and".

Figure 2 – TCSC subsegment
Replace the existing Figure 2 by the following new figure:

© IEC 2019
NOTE Valve arrester is optional.
Figure 2 – TCSC subsegment
Figure 4 – Thyristor valve voltage in a TCSC
Replace the existing Figure 4 by the following new figure:

– 4 – IEC 62823:2015/AMD1:2019
© IEC 2019
Figure 4 – Thyristor valve voltage in a TCSC
4.2.3.1 Capacitive boost operation mode
Replace the existing text by the following new text:
In TCSC capacitive boost operation mode, the TCSC valve current follows the formulation below:
λI⋅
 
n L_peak cosβ
i =−1 ⋅ ⋅ cos(ωt⋅−) ⋅cos(λ⋅ωt⋅ ) , n⋅π − β ≤ (ω ⋅t) ≤ n⋅π + β
( )
 
v N N N
cos(λβ⋅ )
λ −1
 
i = 0 n⋅π + β < (ω ⋅t) < (n + 1)⋅π − β
v
N
n = 0, 1, 2, 3, …
where
λ is the ratio of TCSC subsegment LC branch natural frequency and AC system power
frequency, λ = ;
ω ⋅ L ⋅C
N
I is the AC system line current;
L_peak
ω nominal angle frequency of AC system;
N
β is half of the maximum conduction angle of TCSC valves in one direction for capacitive
boost at I .
L_peak
The rate of current change, di /dt, at thyristor turn-on and turn-off derives as follows:
v
© IEC 2019
λI⋅ 
cosβ
L_peak
di
v
⋅ ω⋅sinβ−⋅ω ⋅sin λβ⋅
( )
NN
dt π 2
cos(λβ⋅ )
λ −1
ωt⋅= +β 
N 
The peak current through the TCSC valve is equal to:
λI⋅  
cosβ
L_peak
i ⋅−1
 
v_peak
cos(λβ⋅ )
λ −1
 
 
The capacitor voltage, U , at thyristor turn-on and turn-off instants is equal to:
C_N
λI⋅
L_peak
UX⋅⋅ sinβ−⋅λ cosβ⋅tan(λ⋅β)
[ ]
C_N 0
λ −1
where
X is the TCSC subsegment LC branch impedance:
L
X =
C
where
L is the inductance of TCSC subsegment LC branch (Figure 2);
C is the capacitance of TCSC subsegment LC branch (Figure 2).
The capacitor voltage peak, appearing on the TCSC valve, is equal to:
λ ⋅(cosβ ⋅tan(λ ⋅β) −⋅λ sinβ)
U =λI⋅ ⋅X ⋅+1
P L_peak 0 
λ −1
The capacitive boost factor of the TCSC subsegment is equal to:
2 2
 
( )
2 λ  2 ⋅ cos β sin 2 ⋅ β 
k = 1+ ⋅ ⋅ ⋅ [λ ⋅ tan(λ ⋅ β )− tan β ]− β −
B  
2 2
π β
 
λ −1 λ −1
 
5.1.1.2 Test object
Replace, in the second sentence of the existing first paragraph, the words "valve interface
electronics units" by "valve base electronics units".
5.2.3 Atmospheric correction factor
Replace, in the existing second and third dash items, the two occurrences of the word "hall" by
"enclosure".
Table 2 – List of tests
Delete, in the second row, the word "earth".
Replace, in the third row, second column, the reference "7.2" by "7.3.1".
=
=
=
– 6 – IEC 62823:2015/AMD1:2019
© IEC 2019
Replace, in the fourth row, second column, the reference "7.3" by "7.3.2".
Replace, in the sixth row, second column, the reference "8.2" by "8.3.1".
Replace, in the seventh row, second column, the reference "8.3" by "8.3.2".
th
Replace, in the 16 row, the existing title "Test for valve insensitivity to electromagnetic
disturbance" by the new title "Test for valve insensitivity to electromagnetic disturbance (type
test)".
th
Replace, in the 17 row, second column, the reference "11.3" by "11".
th
Replace, in the 17 row, third column, the word “valve” by “valve or valve section”.
7.3.1.1 Test values and waveshapes
Replace, in the key U to the equation in item a), the existing brackets by the following new
s1
brackets:
(typically derived from the lower of the protective levels of the valve arrester, if any, and the
capacitor arrester)
Replace, in the key U to the equation in item b), the existing brackets by the following new
s2
brackets:
(typically derived from operation with maximum continuous capacitive boost mode operating
point A2 in Figure 5 for TCSC intended for application of power flow control or from the peak
voltage of maximum continuous voltage across the series capacitor for TCSC intended for
application of power oscillations damping or elimination of the risk of sub-synchronous
resonance)
7.3.2 Lightning impulse test
Replace the existing text by the following text:
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 valve
enclosure.
A standard lightning impulse voltage waveshape in accordance with IEC 60060-1 shall be used.
The test voltage shall be selected in accordance with the insulation co-ordination of the TCSC
installation.
NOTE To use standard lightning impulse withstand voltage according to IEC 60071-1, based on the rated TCSC
voltage, U , for testing is an alternative. However, this alternative does not take the TCSC capacitor surge arrester
N
or TCSC valve surge arrester, if any, protection into consideration and applies an unrealistic higher voltage on the
supporting structure. The choice of this alternative is subjected to agreement of the valve supplier.
8.3.1.1 Test values and waveshapes
Replace, in the existing first paragraph, the words "1 min" by "15 s".
Replace, in the key U to the first equation, the existing brackets by the following new brackets:
v1
(typically derived from the lower of the protective levels of the valve arrester, if any, and the
capacitor arrester)
© IEC 2019
Delete, in the paragraph immediately preceding the second equation, the second existing
sentence starting with "Where this is the case".
Replace, in the second equation, the existing letter symbol "k " by "k ", as follows:
tv2 3
U
v2
Uk⋅
tv2 3
Replace, in the key U to the second equation, the existing brackets by the following new
v2
brackets:
(typically derived from operation with maximum continuous capacitive boost mode operating
point A2 in Figure 5 for TCSC intended for application of power flow control or from the peak
voltage of maximum continuous voltage across the series capacitor for TCSC intended for
application of power oscillations damping or elimination of the risk of sub-synchronous
resonance)
8.3.2.1 Test values and waveshapes
Add, at the end of the subclause, the following new note:
NOTE If the valve impulse withstand levels are equal to or less than the valve AC test level, it is deemed that the
valve AC test can cover the impulse tests and consequently the impulse tests can be omitted.
9.3.5.1.2 Test values and waveshapes
Replace the existing third paragraph by the following new paragraph:
The test duration shall be 1,2 times the specified time at maximum temporary current bypass
mode.
11.1 Purpose of tests
Replace, in the second bullet of the second existing paragraph, the word "converter" by "valve".
Replace the existing last paragraph by the following new paragraph:
The valve insensitivity to electromagnetic disturbance can be checked by monitoring the valve
during other type tests. Of these, the switching impulse test of valve (8.3.2) is the most important.
11.3 Test requirements
Replace, in the third sentence of the existing paragraph, the words "valve interface electronics
units" by "valve base electronics units".
A.2 TCSC characteristics
Delete, at the end of the formula for λ, the comma.
A.4 Reactive power rating
Replace, in the last paragraph, the words "with nominal boost and nominal line current" by "with
the nominal boost factor and the rated line current".

=
– 8 – IEC 62823:2015/AMD1:2019
© IEC 2019
A.9.2 Transient overvoltages
Delete, in the last sentence of the existing paragrap
...