1 Scope
This standard specifies the test parameters, test limits and allowable values of test waveform differences during automatic test discrimination for interturn insulation on random wound winding for AC low-voltage machines.
This part is applicable to the test of interturn insulation on random wound winding for small and medium-sized three-phase or single-phase AC machines with rated voltage of 1140V.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.
GB/T 755-2000 Rotating electrical machines - Rating and performance
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 Definitions
For the purposes of this standard, the following definitions apply.
3.1 comparison parameters
parameters used to compare the test waveform differences in impact waveform comparison method (as defined in JB/T 9615.1).
3.2 (test) waveform area difference
the difference of the enclosed areas (see Figure 1) between either test waveform curve of the tested winding (or coil) and the reference winding (or coil) and the horizontal coordinate (time t) within any designated comparison and discrimination interval
Foreword i
1 Scope
2 Normative references
3 Definitions
4 Test parameters
5 Comparison parameters
Annex A (Normative) Allowable value and its setting of test waveform difference
