IEC 60270:2000/AMD1:2015
(Amendment)Amendment 1 - High-voltage test techniques - Partial discharge measurements
Amendment 1 - High-voltage test techniques - Partial discharge measurements
Amendement 1 - Techniques des essais à haute tension - Mesures des décharges partielles
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IEC 60270 ®
Edition 3.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AM ENDMENT 1
AM ENDEMENT 1
High-voltage test techniques – Partial discharge measurements
Techniques des essais à haute tension – Mesures des décharges partielles
IEC 60270:2000-12/AMD1:2015-11(en-fr)
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IEC 60270 ®
Edition 3.0 2015-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AM ENDMENT 1
AM ENDEMENT 1
High-voltage test techniques – Partial discharge measurements
Techniques des essais à haute tension – Mesures des décharges partielles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 19.080 ISBN 978-2-8322-3013-8
– 2 – IEC 60270:2000/AMD1:2015
© IEC2015
FOREWORD
This amendment has been prepared by IEC technical committee 42: High-voltage and high
current test techniques.
The text of this amendment is based on the following documents:
FDIS Report on voting
42/338/FDIS 42/340/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• withdrawn,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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
3 Definitions
Replace the existing title and introductory phrase with the following new title and introductory
phrase:
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Replace the existing definition 3.10 with the following new definition 3.10:
3.10
digital partial discharge instruments
instruments which perform a digital acquisition and evaluation of the PD data
Note 1 to entry: The A/D conversion of the PD pulses captured from the terminals of the test object can be done
either directly or after the apparent charge pulses have been established employing either an analogue band-pass
filter amplifier or an active integrator (see Annex E).
© IEC2015
Add the following new definitions:
3.12
accumulated apparent charge q
a
sum of the apparent charge q of all individual pulses exceeding a specified threshold level,
and occurring during a specified time interval ∆t
3.13
PD pulse count m
total number of PD pulses which exceed a specified threshold level within a specified time
interval ∆t
3.14
PD pattern
display of the apparent charge q versus the phase angle φ of the PD pulses recorded during
i
a specified time interval ∆t
4.3.4 Wide-band PD instruments
Replace the last sentence of 4.3.4 with the following new text:
Recommended values for the significant frequency parameters f , f and ∆f are:
1 2
30 kHz ≤ f ≤ 100 kHz
f ≤ 1 MHz
100 kHz ≤ ∆f ≤ 900 kHz
Renumber the existing "NOTE" in 4.3.4 to "NOTE 1" and add the following new "NOTE 2":
NOTE 2 For test objects with windings like transformers and electrical machines the acquired frequency band may
be reduced down to a few 100 kHz and even below. The upper limit frequency f to be accepted for such kinds of
test objects should be specified by the relevant Technical Committee.
5.2 Calibration procedure
Renumber the existing "NOTE" in 5.2 to "NOTE 1" and add the following new "NOTE 2" at the
end of the subclause:
NOTE 2 For tall test objects, the connection leads between calibrator and terminals of the test object might
exceed several meters. Thus the transfer of the charge from the calibrator to the test object may be reduced due to
inevitable stray capacitances. The measurement uncertainty acceptable under this condition should be specified by
the relevant Technical Committee.
6.1 General
Replace the existing third paragraph "The voltage pulses of the generator shall have a rise
time t of less than 60 ns." with the following new text:
r
The parameters characterizing unipolar step voltage of magnitude U shall satisfy the
following conditions (see Figure 6):
Rise time: t ≤ 60 ns
r
Time to steady state: t ≤ 200 ns
s
Step voltage duration: t ≥ 5 µs
d
Deviation of the step voltage magnitude U between t and t : ∆U ≤ 0.03 U
0 s d 0
, t and t are measured from the origin t of the step voltage which
The time parameters t
r s d 0
refers to the time instant when the rising voltage equals 10 % of U (see Figure 6).
– 4 – IEC 60270:2000/AMD1:2015
© IEC2015
The time to steady state t is the shortest instant at which the deviation ∆U from U remains
s 0
first time less than 3 %.
The step voltage duration t is the instant after t at which the magnitude of the step voltage
d s
decays below 97% of U . After t the voltage shall decrease continuously down to 10 % of U
,
0 d 0
within a time interval not shorter than 500 µs.
The magnitude U of the step voltage is the mean value occurring within the steady state
duration t − t .
d s
For test objects represented by a lumped capacitance C the calibrating capacitor C shall
a 0
satisfy the conditions C ≤ 200 pF and C ≤ 0,01 C .
0 0 a
For test objects represented by a characteristic impedance Z , such as power cables
c
exceeding a length of 200 m, the value of the calibrating capacitor shall satisfy the conditions
C ≤ 1nF and C × Z ≤ 30 ns.
0 0 c
For calibrators manufactured before this amendment was published, whose time and voltage
parameters do not comply with the above specified values, the deviation of the measured
values from the specified values shall be stated in the test protocol.
11.2 Quantities related to partial discharges
Replace the existing title and text of 11.2 with the following new title and text:
11.2 PD quantities
PD measurements with direct voltage should be based on the following quantities:
– apparent charge of each individual PD pulse occurring during a specified time interval ∆t
i
at constant test voltage, as defined in 3.3.1 (see Figure H.1a)).
– accumulated apparent charge of a PD pulse train occurring within a specified time interval
∆t at constant test voltage, as defined in 3.12 (see Figure H.1b)).
i
– PD pulse count m of PD pulse trains as defined in 3.13 exceeding specified limits of the
apparent charge magnitude q during a specified time interval ∆t at constant test voltage
m i
level (see Figure H.2a)).
– PD pulse count m occurring within specified ranges of the apparent charge magnitude q
m
for a specified time interval ∆t at constant test voltage level (see Figure H.2b)).
i
To determine the PD pulse count m care should be taken so that noisy pulses are not counted
to avoid misleading statistics. Thus before starting the actual PD measurement the
background noise level in terms of pC shall be determined. Based on this the apparent charge
threshold level shall be adjusted to at least twice the background noise.
Values for the PD quantities listed above shall be specified by the relevant Technical
Committee.
11.4 Test circuits and measuring systems
Replace the existing text with the following new text:
To measure the apparent charge according to 3.3.1, the basic circuits shown in Figure 1a to
Figure 1d shall be used in conjunction with either analogue or digital PD measuring systems,
as described in 4.3 and 4.4 and Annex E. The PD instruments applied shall have a pulse train
response that is independent of the repetition rate of PD pulses.
© IEC2015
To indicate the PD pulse count m, the application of either digital PD instruments with
integrated pulse counters or analogue PD instruments in combination with suitable pulse
counting devices is recommended.
The calibration procedures recommended in Clause 5 and the calibrators specified in
Clause 6 can also be applied for testing with direct voltage.
Add, after Figure 5, the following new Figure 6:
U + ΔU
1 U
U – ΔU
0,9 U
0,1 U
t
r
t
t
s
t
d
IEC
t
Key
U step voltage magnitude t step voltage duration
0 d
t origin of the step voltage (t − t ) steady state duration
0 d s
t rise time of the step voltage ∆U absolute voltage deviation from U
r
t time to steady state
s
Figure 6 – Step voltage parameters of a calibrator
A.3 Alternative method
Replace the existing title of Clause A.3 with the following new title:
A.3 Numerical in
...
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