IEC 61992-2:2006/AMD1:2014

IEC 61992-2 ®
Edition 2.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Railway applications – Fixed installations – DC switchgear –
Part 2: DC circuit-breakers
Applications ferroviaires – Installations fixes – Appareillage à courant continu –
Partie 2: Disjoncteurs en courant continu

IEC 61992-2:2006-02/AMD1:2014-04(en-fr)

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IEC 61992-2 ®
Edition 2.0 2014-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Railway applications – Fixed installations – DC switchgear –

Part 2: DC circuit-breakers
Applications ferroviaires – Installations fixes – Appareillage à courant continu –

Partie 2: Disjoncteurs en courant continu

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX M
ICS 45.060 ISBN 978-2-8322-1527-2

– 2 – IEC 61992-2:2006/AMD1:2014
© IEC 2014
FOREWORD
This amendment has been prepared by IEC technical committee 9: Electrical equipment and
systems for railways.
The text of this amendment is based on the following documents:
CDV Report on voting
9/1791/CDV 9/1851/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 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• withdrawn,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.
_____________
2 Normative references
Add "+ A1:2014" to IEC 61992-1:2006
5.2 Type of circuit-breaker
Replace 5.2 b) by:
b) Breaking characteristics (class designation):
1) circuit-breakers without intended limitation of current rise during maximum fault test
– high speed current limiting circuit-breaker H;
the H circuit-breaker has an opening time not greater than 5 ms and a total break
time not greater than 20 ms, when the current to be interrupted has a prospective
sustained value of at least 7 times the circuit-breaker setting and
di
 
≥ 5 kA/ms
 
dt
 
t = 0
– very-high speed current limiting circuit-breaker V;
the V circuit-breaker has a total break time not greater than 2 ms, irrespective of
the other parameters of the circuit;
– semi-high speed circuit-breaker S;
the S circuit-breaker has an opening time not greater than 15 ms and a total break
time not greater than 30 ms, when the current to be interrupted has a prospective
sustained value of at least 3,5 times the circuit-breaker setting and

© IEC 2014
di
 
≥ 1,7 kA/ms
 
dt
 
t = 0
2) circuit-breakers with intended limitation of current rise during maximum fault test
– cut-off current limiting circuit-breaker C;
the C circuit-breaker limits the cut-off current before the short-circuit current to be
interrupted reaches its maximum value; the C circuit breaker can be an air circuit
breaker or a hybrid circuit breaker;
Table 6 gives the maximum values of the cut-off current depending on the preferred
values of rated short-circuit current together with the maximum allowable value of
initial current rise;
Table 6 applies to C circuit-breakers for nominal voltages up to and including
1 500 V.
Table 6 – Limits of the cut-off current of C circuit-breakers during maximum fault test
Short circuit current characteristics Maximum cut-off current
Rated short-circuit Initial rate of rise Circuit time Class C1 Class C2
current constant
I
Nss
kA kA/ms ms kA kA
20 1,5 13,3 15 17
50 3 16,7 25 30
75 10 7,5 50 60
100 10 10,0 55 70
Smoothing reactors should be installed for substations in order to realize an initial rate of rise
equal to or less than the applicable value given in Table 6.

– 4 – IEC 61992-2:2006/AMD1:2014
© IEC 2014
Replace existing Table 1 by the following new Table 1:
Table 1 – Shortened type designation
a a
Items above b) c) d) h)
Options H I
U O
V L
U E
S R
B P
C
Examples H/L/B/E
V/I/P S/R/O
b
H/R and L/U2
NOTE When a circuit-breaker is not suitable to perform all duties as given in 5.3.4.2, this fact will be indicated
by means of the lower case letter(s) designating actual capability according to Table 2, first column (for example
H1/I ff, fr/P).
a
Optional designations.
b
When a circuit-breaker is or shall be suitable for multiple alternate functions, the indication of these functions
shall be preceded by an “and”.

5.3.4.1 Rated short-circuit breaking and making capacities
Replace, in the first paragraph, "designation H or V or S" by "designation H, V, S or C".
Replace the 4th paragraph by the following:
H, V and S circuit breakers having a breaking capacity at a rated track time constant T are
Nc
. For
capable of the same breaking capacity at all lower values of circuit time constant t
c
Type C circuit breakers the initial rate of rise shall not exceed the limits given in Table 6.
5.3.4.2 Duties and test duty cycles
Add, in the last sentence of the Note,“duty 3” as follows:” (duty 1, or duty 2, or duty 3)”.

© IEC 2014
Replace existing Table 2 by the following new Table 2:
Table 2 – Circuit-breaker duties
Duty Use Conditions Test current Prospective peak Time constant
f L Maximum fault I Type H, V and S: By consequence of
Nss
other circuit
≥1,42 × I
Nss parameters
Type C: ≥ I See Table 6
Nss
a
e L Maximum energy 0,5 × I By consequence of 0,5 × T
Nss Nc
other circuit
parameters
d L Distant fault 2 × I By consequence of T
Ne Nc
other circuit
parameters
l L Low current I Not applicable
≅0,01 s
c
ff I Maximum fault I Type H, V and S: By consequence of
Nss
forward other circuit
≥1,42 × I
Nss parameters
See Table 6
Type C: ≥ I
Nss
fr I Maximum fault I Type H, V and S: By consequence of
Nss
reverse other circuit
≥1,42 × I
Nss parameters
Type C: ≥ I See Table 6
Nss
I
lr I Forward low current Not applicable ≅0,01 s
c
after reverse short
b
R
circuit
c
r R Maximum fault I ≥1,42 × I
Nss Nss
reverse with
paralleled converters
c
s R Short time current I
≥1,42 × I
Ncw
Ncw
forward
NOTE 1 For substations equipped with smoothing reactors of high value, the maximum energy condition may
correspond to the maximum fault condition.
NOTE 2 I is to be determined for each type of actual circuit situation. Therefore, I may be different for
Nss Nss
Line L, Interconnector I and Rectifier R circuit-breakers.
a
The factor affecting both I and T for maximum energy fault position is taken for practical reasons as
Nss Nc
0,5. For low values of T , see Table 2 of IEC 61992-1.
Nc
b
R only when explicitly required by the purchaser.
c
The coefficient is 1 with regard to the C circuit-breaker.

– 6 – IEC 61992-2:2006/AMD1:2014
© IEC 2014
Replace existing Table 3 by the following new Table 3:
Table 3 – Test duty cycles
Duty Breaking Test cycle
characteristics
a
f, e, d H,V,S Duty 1 O – 15 s – CO – 15 s – CO – 60 s – CO
Duty 2 O – 7 s – CO – 10 s – CO – 60 s – CO
b c
C Duty 3 O – 10 s – CO
ff, fr, r H,V,S,C O – 15s – CO
l, lr H,V,S,C 10 times (O – 120 s – CO)
s H,V,S,C Carrying for 0,25 s
NOTE 1 O = opening operation, CO = closing operation.
NOTE 2 First opening is made on a short circuit being established.
a
The choice of Duty 1 or 2 is left to the purchaser. If no choice is made, then the duty cycle required is Duty 1.
b
In the case of C, the test cycle of duty e and d are subject to agreement between purchaser and supplier.
c
The standard duty is O – 10 s – CO. However, if AC short-circuit test method is applied, the duration
between O and CO may be reduced to less than 10 s.

8.2 Applicable tests and test sequence
Replace existing Table 4 by the following new Table 4:
Table 4 – List of applicable tests and sequence
Reference to
Group Test description Kind
subclause
General operating characteristics

Verification of conformity to the manufacturing drawings Type and routine 8.3.1
and to characteristics of the circuit-breaker
Mechanical operation Type and routine 8.3.2
Dielectric withstand Type and routine 8.3.3
Temperature-rise Type 8.3.4
Verification of the adjustment of the relays and releases Routine 8.3.5
Electrical endurance Type 8.3.6
Mechanical endurance Type 8.3.7
Short circuit behaviour
Verification of the H, V or S characteristic Type 8.3.8.1
Verification of the C characteristic Type 8.3.8.9
Verification of the short-time withstand current of rectifier Type 8.3.9
circuit-breakers R
Verification of the adjustment of the relays and releases Type 8.3.5
3 Search for critical currents and low current test duty Type 8.3.10

8.3.8 Verification of the making and breaking capacity in short-circuit conditions and
of the H, V or S characteristic
Replace the title of subclause 8.3.8 by:

© IEC 2014
8.3.8 Verification of the making and breaking capacity in short-circuit conditions
8.3.8.1 Tolerances on the test values
Replace the title of subclause 8.3.8.1 by:
8.3.8.1 Verification of the H, V or S characteristic
Add new subclause 8.3.8.9, between 8.3.8.1 and 8.3.8.2:
8.3.8.9 Verification of the making and breaking capacity in short-circuit conditions
and of the C characteristic
8.3.8.9.1 Tolerances on the test values
This test is carried out at the values indicated by the manufacturer in 5.3.1 to 5.3.3 in
accordance with 5.3.4. The test is considered valid if the reported values differ from stated
values within the limits stated in Table 6 of IEC 61992-1:2006 except for the time constant.
The tolerances of the initial rate of rise shall be 0 ~ +30 % and as a consequence the
tolerances for the time constant are –30 % ~ 0.
For laboratory reasons, these tolerances may be revised by mutual agreement.
8.3.8.9.2 Test conditions
The circuit-breaker shall be a complete assembly. The control device, except for control
motors, shall be supplied at its minimum voltage value, as stated in 5.4.
The circuit-breaker should be tested in an enclosure having the minimum volume and
dimensions as declared by the manufacturer, or in open air when intended for cell use, using
screens to simulate the closest proximity of cell walls and ceiling. These screens or cubicle
shall be metal and connected to the circuit-breaker earthed frame. Screens and cubicles may
be lined with insulation if this is the manner in which the circuit-breaker operates in service.
8.3.8.9.3 Procedure
The test, as specified in 5.3.4, consists of a number of duties particular to a class of circuit-
breaker with an appropriate duty cycle and release setting. Each duty cycle is required to be
performed once and, because of the severe nature of the test, the circuit-breaker may be
maintained between duty cycles.
In the case of adopting Duty 3 in Table 3, test cycle O – 10 s – CO shall be carried out once.
For laboratory reasons, the time between O and CO may be shorter than 10 s by mutual
agreement (See Table 3, note b).
Where a circuit-breaker can have applications of either of its primary terminals connected to
the positive supply, then the test duties f), e) and d) (see Table 3) shall be repeated for both
connections.
After each test duty, a dielectric test is required in accordance with 7.6.3 of IEC 61992-1:2006.
8.3.8.9.4 Test circuit
A typical arrangement of the test circuit is shown in Annex A of IEC 61992-1:2006.
Details of the test circuit are given in 7.6.1 of IEC 61992-1:2006.
For laboratory reasons, the AC short-circuit test method may be applied by mutual agreement
(see Annex B).
– 8 – IEC 61992-2:2006/AMD1:2014
© IEC 2014
For test duties e) and d), where insufficient impedance can be added to the load side, then
the test duty shall be repeated with the live connection to the opposite terminal. Thus both
terminals of the circuit-breaker are stressed to earth during extinguishing of arc.
8.3.8.9.5 Time constant of the test circuit
The test circuit time constant is as follows (see Table 2).
a) For the maximum fault test the circuit time constant shall be the value given in Table 6.
b) For the maximum energy, the circuit time constant shall be equal to or higher than half of
the rated time constant T (For the actual value see 5.1.1.3 of IEC 61992-1:2006).
Nc
c) For the distant fault, the circuit time constant t should be equal to the rated time constant
c
T .
Nc
d) For the electrical endurance test, the circuit time constant t should be set at 0,01 s.
c
e) For the critical current test, the circuit time constant t should be as close to 0,01 s as
c
possible.
When calibrating each test, the test circuit time constant or the initial rate of rise shall be
measured. The time constant is taken from the test current. (See the calibration waveform 2 in
IEC 61992-1:2006, Table A.2.)
In the case of adopting the AC short-circuit test method, Annex B should be referred.
8.3.8.9.6 Recovery voltage
For the test, the average value of the recovery voltage shall be not lower than the rated
voltage U . In the case of adopting the AC short-circuit test the test conditions given in
Ne
Clause B.3 may apply.
8.3.8.9.7 Details for conducting the tests
8.3.8.9.7.1 Calibration of the test circuit
The test shall be performed at the rated voltage U , calibrated with the test unit A replaced
Ne
by a provisional connection B of negligible impedance in respect to the test circuit.
Adjust resistors R and reactors L in order to obtain both the sustained short-circuit current
and the rated time constant. These values are for the prospective current and shall be those
declared by the manufacturer, within the tolerances stated in 7.2 of IEC 61992-1:2006 (see
8.3.8.1 ).
In the case of adopting the AC short-circuit test method, Annex B should be referred.
8.3.8.9.7.2 Performance of the tests
Replace the provisional connection B by the test unit A, with the terminals of the circuit-
breaker connected as required by the test duty. The tests shall comply with 8.3.8.3 and with
the conditions specified in 7.6.2 of IEC 61992-1:2006.
After the current interruption, the recovery voltage shall be maintained for 0,1 s.
If the test is performed as AC test the recovery voltage time may be less than 0,1 s by mutual
agreement.
© IEC 2014
8.3.8.9.7.3 Behaviour of the circuit-breaker during the making and breaking short
circuit tests
During the test the circuit-breaker shall break the short-circuit current; there shall be no re-
ignition after current zero. The short-circuit current shall be the rated short-circuit current.
The circuit-breaker shall achieve the values given in Table 7.
Table 7 – Verification of the behaviour of the circuit-breaker
when performing test duties f, ff and fr
Type Opening time Total break time Current setting Initial rate of rise Cut off current
ms ms kA kA/ms kA
C Not applicable Not applicable Maximum value Equal to or higher Equal to or less
than the value than the value
given in Table 6 given in Table 6

The fuse element in the protection device D shall not blow during the test.
The cut-off current shall be verified.
8.3.8.9.7.4 Conditions of the circuit-breaker after the above test
These shall be in accordance with the conditions specified in 7.6.3 of IEC 61992-1:2006.
8.3.8.9.8 Verification of the C characteristic for test duties f, ff and fr
During the maximum fault test for test duties f, ff and fr, the behaviour of the circuit-breaker in
meeting its class designation of C shall be verified only if the test currents and settings are as
given in Table 7.
The cut-off current of the circuit-breaker shall be as given in Table 7.
8.3.10 Searching for critical currents and performing test duty l) and lr)
Replace the third paragraph by:
For L circuit-breakers test duty l is performed at the value of critical current I determined for
c
unidirectional circuit-breakers U and U as described in Clause C.2 of IEC 61992-1:2006 for
1 2
bidirectional circuit-breakers B as described in Clause C.3 of IEC 61992-1:2006.
Delete Note 1.
Replace the fourth paragraph by:
For R and I circuit-breakers test duty lr is performed at the value of critical current I
c
determined as described in Clause C.3 of IEC 61992-1:2006.
Add the following new Annex B:

– 10 – IEC 61992-2:2006/AMD1:2014
© IEC 2014
Annex B
(normative)
AC short-circuit test method
B.1 General
For circuit-breaker C, this annex gives the alternative AC method for the making and breaking
short circuit tests specified in 8.3.8.9.
B.2 Test circuit
The conditions of the AC short-circuit test corresponding to the DC short-circuit test are as
follows (see Figure B.1).
Making switch For protection L R
Circuit-breaker
under test
Power supply
IEC  1399/14
Key
L circuit inductance
R circuit resistance
Figure B.1 – Test circuit
Typical voltage and current waveforms of the AC short-circuit test are as follows (see
Figure B.2):
© IEC 2014
φ
U
U MAX
Power supply voltage
U
r
Û
Voltage between poles arc
I
cut off
Current
IEC  1400/14
Key
f Test frequency Û Maximum arc voltage
arc
U Peak value of voltage I Cut off current
max cut off
U Supply voltage ϕ Making phase angle
U Recovery voltage
r
Figure B.2 – Typical voltage and current waveforms of the AC short-circuit test
B.3 Test conditions
The conditions of the AC short-circuit test are as follows:
Supply voltage U
The voltage U at opening of the circuit-breaker contact shall be equal to or greater than
the rated voltage U .
Ne
Recovery voltage U
r
The recovery voltage U shall be equal to or greater than the rated voltage U .
r Ne
Circuit resistance R
The circuit resistance R shall be equal to or less than U / I + 5
...