JB/T 9615.1-2000 PDF in English
JB/T 9615.1-2000 (JB/T9615.1-2000, JBT 9615.1-2000, JBT9615.1-2000)
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| JB/T 9615.1-2000 | English | 170 |
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Test methods of the interturn insulation on random wound winding for AC low-voltage machines
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Standards related to (historical): JB/T 9615.1-2000
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JB/T 9615.1-2000: PDF in English (JBT 9615.1-2000) JB/T 9615.1–2000
JB
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
K 20
Test methods of the interturn insulation on random
wound winding for AC low-voltage machines
ISSUED ON. APRIL 24, 2000
IMPLEMENTED ON. OCTOBER 01, 2000
Issued by. State Administration of Machinery Industry
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Definitions ... 4
4 Test instruments ... 5
5 Test method ... 5
6 Selection principle of test connection ... 8
7 Test identification ... 9
8 Automatic testing and automatic identification ... 11
Annex A (Normative) Comparison method of impulse waveform ... 13
Foreword
This Standard is part 1 of the interturn insulation on random wound winding for AC
low-voltage machines. The series consist of following standard.
1. JB/T 9615.1-2000 Test methods of the interturn insulation on random wound winding
for AC low-voltage machines;
2. JB/T 9615.2-2000 Test limits of the interturn insulation on random wound winding for
AC low-voltage machines.
This Standard is the revision of JB/T 294-87 Test methods of the interturn insulation on
random wound winding for AC low-voltage machines, according to the rules given in GB/T
1.1-1993.
Compared with JB/T 294-87, the written format of the standard has been changed;
technical contents have been essentially unchanged. Partial contents are consistent with
JB/Z 346-89. In order to meet the requirements of automatic detection, it has
supplemented the requirements for test instrument in clause 4. The previous-version
standard has been implemented for decade, the typical test waveform graph in Annex A
has been deleted, as it has become a common sense.
This Standard shall replace JB/Z 294-87 from the implementation date.
Annex A of this Standard is normative; annex B is informative.
This Standard was proposed and shall be under the jurisdiction of Shanghai Electrical
Apparatus Research Institute.
The responsible drafting organization. Shanghai Electrical Apparatus Research Institute.
The chief drafting staffs of this Standard. Chen Hanqiu, and Qin Xiaoxiao.
Test methods of the interturn insulation on random
wound winding for AC low-voltage machines
1 Scope
This Standard specifies the method of AC motor loose winding inter-turn insulation test.
This Standard applies to the 3-phase or single-phase of AC motor loose winding inter-turn
insulation test of which the nominal voltage is not more than 1140 V.
2 Normative References
The articles in the following standard are quoted by this Standard and become the articles
of this Standard. At the time of publication, the edition indicated is valid. All standards are
subject to revision. Parties who enter into an agreement based on this Standard are
encouraged to investigate the possibility of applying the most recent edition of the
standard indicated below.
JB/T 9615.2 Test limits of the interturn insulation on random wound winding for AC
low-voltage machines
3 Definitions
For the purpose of this Standard, the following definitions apply.
3.1 Comparison method of impulse waveform
A method to test motor winding (or coil) turn-to-turn insulation by using impulse voltage
test.
Use impulse voltage wave that possesses specified peak-value and front time; alternately
(or simultaneously) and directly apply to the same-design test-object winding (or coil) AND
reference-object winding (or coil); test whether the performance of motor winding (or coil)
turn-to-turn insulation is good or not by judging the whether damped oscillation waveforms
caused by impulse voltage are different. See annex A for details (normative annex).
3.2 Reference-object winding (or coil)
When using impulse waveform comparison method to test motor winding (or coil)
turn-to-turn insulation, the motor winding (or coil) that is used to compare with
test-object winding (or coil).
3.3 Test waveform difference
When using impulse waveform comparison method to test motor winding (or coil)
inter-turn insulation, and in test-object winding (or coil) and reference-object winding (or
coil), the difference between both test waveforms that is caused by non-insulation
failures such as turn-to-turn insulation failure, material and process fluctuation; it is usually
expressed in percentage.
The test waveform difference caused by turn-to-turn insulation failure is usually called
harmful difference.
The test waveform difference not caused by insulation failure is usually called non-harmful
difference or allowable difference.
4 Test instruments
4.1 Two groups of impulse voltage wave outputted by the instruments shall be
symmetrical (tolerance±3%).
It is allowable that the instrument outputs a single-impulse voltage wave OR converts a
single-impulse voltage into double-impulse voltage waves for output.
4.2 Front time of the first impulse voltage wave outputted by instrument are 0.2 s
(tolerance s) and 1.2 s (tolerance±30%). 0.2 s is recommended with priority.
Other front time can be outputted upon client’s demand.
4.3 Maximum impulse voltage peak outputted by instrument shall meet the test limit value
requirements on related test-object by JB/T 9615.2; tolerance is ±5% or ±3%, the
recommended priority is ±3%.
4.4 Impulse voltage peak outputted by instrument shall be continuously adjustable, with
indication or pre-setting. Measurement accuracy is ±1.5% or ±1%, the recommended
priority is ±1% and the adoption of digital peak voltmeter indication.
4.5 The instrument shall be able to clearly display and distinguish the waveform,
waveform scanning frequency is adjustable.
4.6 The instrument can operate continuously and reliably.
4.7 The instrument shall be equipped with special test wire, reliable earth terminal, and
necessary safety warning measure; the test conversion connection shall be convenient
and reliable.
4.8 The instrument can be equipped with microcomputer interface, and with functions
such as test waveform storage, comparison parameter setting, test waveform difference
display, automatic identification and alarm. Instrument can be equipped with testing
voltage conversion test device.
5 Test method
motor wiring with larger volume.
6.3 Δ (angle) connection
It is applicable to test motor windings that have already been connected as Δ-connection.
7 Test identification
The standard takes test waveform as the main identification evidence.
The automatic test waveform identification instrument which can compare and calculate
the test waveform difference can be the supplementary method for automatic
identification.
Display of fault waveform often accompanies with discharge sound, even with discharge
spark and smell of O3; those signals can assist to identify fault type and location.
7.1 Normal waveform
If damped oscillation waveform displayed in two tests overlaps basically without
significance difference (abbreviation as overlap), it is normal waveform, namely no fault
for test-object winding turn-to-turn insulation, see annex A (normative annex).
7.2 Fault waveform
If abnormal waveform happens, there is fault for winding turn-to-turn insulation, see annex
A (normative annex).
7.3 Identification of 3-phase motor fault
Fault of 3-phase motor shall be identified separately by different wiring methods.
If one of two test waveforms displays differently, then single-phase winding has fault; if
both test waveforms display differently, then it is necessary to conduct the 3rd test.
If the 3rd test waveform displays overlap, then single-phase winding has fault; if difference
still exists, then fault exists in windings of 2 and above phases.
For 2nd and 3rd test, identification can be made by selecting any one wiring method.
7.3.1 See Table 1 for (phase) connection fault identification example (see Figure 1
for wiring); others use the same analogy.
Table 1 (phase) connection fault identification example
S/N. Test times Instrument terminal wiring Waveform display Fault identification H1 H2 L
1 U2 V2 U1 and V1 √
2 U2 W2 U1 and W1 × W phase fault V2 W2 V1 and W1 ×
1 U2 V2 U1 and V1 ×
2 U2 W2 U1 and W1 √ V phase fault V2 W2 V1 and W1 √ U phase fault
1 U2 V2 U1 and V1 ×
2 U2 W2 U1 and W1 × Conduct 3rd test V2 W2 V1 and W1 ×
V2 W2 V1 and W1 √ U phase fault × Fault of 2-phase and above
U2 W2 U1 and W1 √ V phase fault × Fault of 2-phase and above
Notes. √ — waveform displays overlap; × — waveform displays differently.
7.3.2 See Table 2 for Y (wiring) connection fault identification example (see Figure 2
for wiring); others use the same analogy.
Table 2 Y (wiring) connection fault identification example
S/N Test times Instrument terminal wiring Waveform display Fault identification H1 H2 L
1 U V W √
2 V W U × W phase fault U W V ×
1 U V W ×
2 V W U √ U phase fault
U W V √ V phase fault
1 U V W ×
2 V W U × Conduct 3rd test U W V ×
U W V √ V phase fault × Fault of 2-phase and above
V W U √ U phase fault × Fault of 2-phase and above
Notes. √ — waveform displays overlap; × — waveform displays differently.
7. 3.3 See Table 3 ...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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