IEC 62271-109:2008/AMD1:2013

IEC 62271-109 ®
Edition 2.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
High-voltage switchgear and controlgear –
Part 109: Alternating-current series capacitor by-pass switches

Appareillage à haute tension –
Partie 109: Interrupteurs de contournement pour condensateurs série à courant
alternatif
IEC 62271-109:2008/A1:2013
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IEC 62271-109 ®
Edition 2.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
High-voltage switchgear and controlgear –

Part 109: Alternating-current series capacitor by-pass switches

Appareillage à haute tension –

Partie 109: Interrupteurs de contournement pour condensateurs série à courant

alternatif
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX F
ICS 29.130.10 ISBN 978-2-83220-826-7

– 2 – 62271-109 Amend.1 © IEC:2013

FOREWORD
This amendment has been prepared by subcommittee 17A: High-voltage switchgear and

controlgear, of IEC technical committee 17: Switchgear and controlgear.

The text of this amendment is based on the following documents:

FDIS Report on voting
17A/1038/FDIS 17A/1043/RVD
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 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• withdrawn,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.
_____________
3.7.106
peak value of transient by-pass current
Replace the existing term, definition and notes as follows:
by-pass making current
peak value of the by-pass current in a pole of a by-pass switch during the transient period
following the initiation of current during a by-passing operation. This value is the maximum
instantaneous value of the sum of the capacitor bank discharge current component and the
power-frequency current component. In case of system faults, the power-frequency fault
current is equal to the maximum varistor coordinating current or for schemes without varistor,
the actual maximum power-frequency fault current at the particular location

NOTE 1 The peak value may differ from one pole to another and from one operation to another as it depends on
the instantaneous capacitor voltage prior to by-passing.
NOTE 2 Where, for a three-phase circuit, a single value of peak value of by-pass making current is referred to,
this is, unless otherwise stated, the highest value in any phase.
NOTE 3 The maximum power-frequency fault current at a particular location or the maximum varistor coordinating
current is generally much lower than the rated peak withstand current of by-pass switch.
3.9 Index of definitions
Add, under "B", the following new line:
By-pass making current     3.7.106
Delete, under "P", the existing line "peak value of the transient by-pass current".

62271-109 Amend.1 © IEC:2013 – 3 –

4.101 Rated operating sequence

Replace the existing Notes 1, 2 and 3 of this subclause by the following new text and notes:

where
C represents a closing operation;

OC represents an opening operation followed immediately (that is, without any

intentional delay) by a closing operation;

t and t' are time intervals between successive operations;

t and t' should always be expressed in minutes or in seconds.

If the by-passing-insertion time is adjustable, the limits of adjustment should be specified.
NOTE 1 Instead of t = 0,3 s, other value: t = 0,2 s is also used for by-pass switches intended for rapid auto-
reopening.
NOTE 2 Instead of t' = 3 min., other values: t' = 15 s and t' = 1 min are also used for by-pass switches intended
for rapid auto-reopening.
NOTE 3 Other operating sequences may be specified depending upon system requirements.

4.102 Rated by-pass making current (I )
BP
Replace the existing first paragraph of this subclause by the following new paragraph:
The rated by-pass making current is the maximum value of the by-pass making current that
the by-pass switch shall be capable of making under line fault condition when the capacitor
bank is pre-charged to the limiting voltage of the overvoltage protector (U ) and with a
PL
frequency of the by-pass discharge current corresponding to the actual capacitance of the
capacitor bank with its associated inductance of the damping circuit. The effective damping of
the by-pass discharge current can be taken into consideration.
Replace the existing note of this subclause by the following new note:
NOTE The rated by-pass making current should be determined by system studies as the maximum sum of the
instantaneous capacitor bank discharge current and the instantaneous fault current component during the pre-
arcing period (see also IEC 60143-2). A value of pre-arcing time of 5 ms is suggested in case no data is available.
Replace the existing third paragraph of this subclause by the following new paragraph:
The by-pass making performance is covered when the required peak value of the by-pass
making current is equal to or lower than the peak current value used in the relevant type test.

This rule is considered to be valid only when the frequency f of the by-pass making current
BP
is equal to or lower than 130 % of the corresponding value used during type tests.

6.104.5 Number of making operations
Replace the existing text of the subclause, including the note, by the following new text and
table:
The by-pass making current test can be performed using one of the two alternatives given in
Table 7.
The by-pass switch conditions shall be in accordance with 6.102.3.1.

– 4 – 62271-109 Amend.1 © IEC:2013

Table 7 – Test procedures for by-pass making current tests

Alternative No. of making Test current

operations
Alternative 1 20 I
BP
I
BP
Alternative 2
20 I
DISCHARGE
8 Guide to the selection of by-pass switches for service

Replace the existing text of this subclause by the following new text:
For more information refer to IEC 60143-1, IEC 60143-2 and Annexes E and F of this
standard.
Annex E – By-pass switches used as the primary by-passing devices
Replace the existing annex by the following new annex:

62271-109 Amend.1 © IEC:2013 – 5 –

Annex E
(normative)
By-pass switches used as the primary by-passing devices

By-pass switches are sometimes used as the primary protection of the overvoltage protector

of the series capacitor bank (e.g. without the use of a fast by-passing device such as a spark-

gap) for cases where the power-frequency fault current is relatively low (capacitor banks
generally located in the middle of the line length) or where the use of a spark-gap could result

in non-reliable operation of the spark-gap. For such series capacitor schemes, the varistor

bank is designed to absorb the resulting energy produced by a line fault until the by-pass
switch is closed. Figure E.1 illustrates the typical component layout.
C
NLR
D
S
IEC  1448/06
Key
C series capacitor
NLR non linear resistor (varistor)
D damping circuit
S by-pass switch
Figure E.1 – Typical component layout for by-pass switches
used as the primary by-passing device
For this particular application, the requirements stated in this standard also apply with the
following addition.
The by-pass switch will be subjected, for all line faults, to the capacitor bank discharge

current component (I ) and to the power-frequency fault current. For schemes using
DISCHARGE
fast by-passing devices (for example s
...