IEC 60034-18-41:2014/AMD1:2019

IEC 60034-18-41 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Rotating electrical machines –
Part 18-41: Partial discharge free electrical insulation systems (Type I) used in
rotating electrical machines fed from voltage converters – Qualification and
quality control tests
Machines électriques tournantes –
Partie 18-41: Systèmes d’isolation électrique sans décharge partielle (Type I)
utilisés dans des machines électriques tournantes alimentées par des
convertisseurs de tension – Essais de qualification et de contrôle qualité

IEC 60034-18-41:2014-03/AMD1:2019-06(en-fr)

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IEC 60034-18-41 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Rotating electrical machines –

Part 18-41: Partial discharge free electrical insulation systems (Type I) used in

rotating electrical machines fed from voltage converters – Qualification and

quality control tests
Machines électriques tournantes –

Partie 18-41: Systèmes d’isolation électrique sans décharge partielle (Type I)

utilisés dans des machines électriques tournantes alimentées par des

convertisseurs de tension – Essais de qualification et de contrôle qualité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-6886-5

– 2 – IEC 60034-18-41:2014/AMD1:2019
© IEC 2019
FOREWORD
This amendment has been prepared by IEC Technical Committee 2: Rotating machinery.
The text of this amendment is based on the following documents:
FDIS Report on voting
2/1949/FDIS 2/1957/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 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• withdrawn,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 Terms and definitions
Replace the existing term and definition 3.19 with the following:
3.19
impulse voltage insulation class
IVIC
peak to peak voltage classes A, B, C, D, S for reliable operation,
assigned by the manufacturer in relation to the rated voltage for a specified converter-driven
machine and indicated in its documentation and, if applicable, on its rating plate
Add the following new terms and definitions:
3.26
maximum allowable terminal voltage
U
IVIC
maximum allowable peak to peak phase to ground voltage in service, according to the IVIC
specification
3.27
test voltage factor
TVF
maximum allowable peak to peak phase to ground voltage in service in units of U , divided by
N
© IEC 2019
12 Routine tests
Replace the existing text of this clause with the following:
12.1 Optional PD test
It is good practice to perform a routine test on each winding. For this purpose, it is recommended
that the PD tests described in 11.2 and 11.3 are performed in agreement between the
manufacturer and customer on each machine produced. The passing of this PD routine test,
that has been performed according to this document and to the IVIC specified, shall be entered
into the documentation for the machine, if required, or stored in the relevant database of the
manufacturer.
12.2 Routine withstand voltage test
A mandatory minimum withstand voltage test for all machines with or without IVIC is described
in IEC 60034-1. This withstand voltage test may be required at an increased voltage level for
converter-fed machines, according to the specified IVIC, as described in Annex D. The
derivation of test voltage factors (TVF) for the routine withstand voltage test of Type I converter-
fed rotating electrical machines and an example of routine withstand test voltages for a 500 V
rated rotating machine fed from a converter are given in Annex D.
The passing of this test with the withstand voltage level according to this document and to the
specified IVIC, shall be entered into the documentation for the machine, if required, or stored
in the relevant database of the manufacturer.
During the routine testing of quantity produced machines up to 200 kW (or kVA) and rated for
U ≤ 1 kV, the 1 min test may be replaced by a test of 1 s (see IEC 60034-1) at 120 % of the
N
test voltage specified in Table D.1, for example S – (manufacturer specified):
· U + 1 kV ) · 1,2.
(B/ 2
N
For very small sized machines or windings, produced in large quantity, for example with a rated
power of < 1 kW, a test level of 120 % for the 1s-withstand-test may be excessive in case of
IVIC C or D specified machines. In this case an IVIC-specified test level of 100 % can be used
instead, but at least to the test level defined in IEC 60034-1.
Annex B
B.3 Enhancement factors for PD tests
At the end of Clause B.3, after Table B.2, add the following new text:
It is known and well documented in the relevant literature, that relative humidity (environmental
on-site conditions) and density of air (altitude) may affect the PD inception voltage during testing
and in service to a similar extent as the temperature. Results reported in literature suggest, that
the relative and absolute humidity during test and in service will influence the actual
PDIV/RPDIV in both directions. For this reason, a further enhancement factor could be applied
to correct PDIV/RPDIV results.
The influence of the altitude on the RPDIV can become quite high, according to the strongly
reduced air-pressure resulting in reduced PDIV/RPDIV. Depending on the design of the
insulation system and the expected maximum altitude in service, this should be reflected by an
additional enhancement factor.

– 4 – IEC 60034-18-41:2014/AMD1:2019
© IEC 2019
B.6 Calculation of test voltages
Replace the first paragraph with the following:
As an example, the peak/peak PD-test voltages for phase/phase and phase/ground insulation
in a 500 V rated rotating machine fed from a 2-level converter are calculated as in Clause B.5
but without the additional factor of 1,1 (arising from line voltage variations) and multiplied by
the relevant total enhancement factor shown in Table B.2. This applies whether the test voltage
is sinewave or impulse. It is generally expected that the total enhancement factor will be 1,25.
The resulting test voltages for the example shown in Table B.4 are given in Table B.5.
Replace Table B.5 with the following:
Table B.5 – Examples of maximum peak/peak PD-test voltage
for a 500 V rated winding fed, e.g. from a 2-level converter, according
to the stress categories of Table 4 and with EF 1,25
Stress category Examples of maximum peak to
or impulse peak PD-test voltage
voltage insulation
Phase to Phase to
class (IVIC)
phase ground
V V
A (Benign) 1 857 1 300
B (Moderate) 2 532 1 773
C (Severe) 3 375 2 364
D (Extreme) 4 219 2 955
S (manufacturer To be decided To be decided
specified)
According to Clause C.2, an IVIC S may be assigned by the manufacturer which defines the
maximum allowable peak to peak voltages and the resulting PD test voltages.
C.1 Impulse voltage insulation class (IVIC) of the machine
Replace the third paragraph with the following:
The maximum allowable voltages assigned to the impulse insulation classes in Table C.1 have
been derived using Formulae (1) and (2) together with the arbitrarily chosen stress category
overshoot factors in Table 4. They are given in units of U (i.e. the voltages in Table B.4 divided
N
by 500) in order to have them independent from various rated machine voltages. While these
voltage limit steps have been derived from operating voltages experienced in service, they pose
arbitrary classes in nature. In many cases, intermediate steps for these voltage limits and
independency of the limits for phase-phase and phase-ground voltages may be required
(see Clause C.2).
© IEC 2019
Add the following new Annex D:
Annex D
(informative)
Derivation of routine withstand test voltages and
an example for a 500 V rated machine
Table D.1 shows the test voltage factors (TVF) for Type I converter-fed rotating machines, which
have been qualified with an IVIC classification, and the resulting routine withstand test voltages
for a 500 V rated machine as an example. The test voltage factor (TVF) shown in Table D.1 is
defined as the maximum allowable operating peak to peak phase to ground voltage in units of
U divided by 22 . Here, this divisor reflects, that U and accordingly related test voltages

N N
defined in IEC 60034-1 are given as r.m.s-value. The values are shown for each of the
appropriate impulse voltage insulation classes. The routine withstand test voltage for a
converter-fed machine is not permitted to be below the value for a line-fed machine having the
same rated voltage.
Table D.1 – Withstand test voltages according to IVIC
for Type I insulation systems
Maximum allowable Maximum TVF Examples of routine phase
peak to peak allowable to ground test voltages for
operating voltages in enhancement a machine with U = 500 V
N
a
ratio for
...