Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 2: Test limits
1 Scope
This part of GB/T 22719 specifies the test parameters, test limits and allowable values of test waveform differences during automatic test discrimination for interturn insulation of random-wound winding for AC low-voltage machines.
This part is applicable to the inspection for interturn insulation of random-wound winding for three-phase or single-phase AC electrical machine with rated voltage of 1,140V and below.
2 Normative references
The following normative documents contain provisions which, through reference of GB/T 22719, constitute provisions of this part. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply to this part. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest editions apply to this part.
GB 755-2008 Rotating electrical machines - Rating and performance (IEC 60034-1:2004, IDT)
GB/T 8170-1987 Rules for rounding off of numerical values
JB/T 9615. 1-2000 Test methods of the interturn insulation on random wound winding for AC low-voltage machines
3 Terms and definitions
For the purposes of this part, the following terms and definitions apply.
3.1
comparison parameter
parameters used to compare the test waveform differences in the impact waveform comparison method
3.2
waveform area difference
the difference of the enclosed areas (see Figure 1) between either test waveform curve of the tested winding (or coil) or the reference winding (or coil) and the horizontal coordinate (time t) within any designated comparison and discrimination interval
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Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Test parameters
5 Comparison parameters
Annex A (Informative) Allowable value of overall test waveform difference and its setting
