This standard specifies the test methods, test parameters and test limits of interturn insulation of form-wound winding for AC electrical machines.
This standard is applicable to the inspection of interturn insulation of form-wound winding for small and medium AC electrical machine with rated voltage of 1140V or below.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, 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. For undated references, the latest edition of the normative document referred to applies.
GB 755-2008 Rotating Electrical Machines - Rating and Performance (IEC 60034-1: 2004, IDT)
GB/T 8170-2008 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values
JB/T 9615.1-2000 Test Methods of the Interturn Insulation on Random Wound Winding for Ac Low-voltage Machines
JB/T 9615.2-2000 Test Limits of the Interturn Insulation on Random Wound Winding for Ac Low-voltage Machines
JB/T 10098-2000 Impulse Voltage Withstand Levels of Rotating A.C. Machines With Form-wound Stator Coils
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
comparison method of impulse waveforms
one test method of interturn insulation of electrical machine winding (or coil) with impulse voltage
Principle: directly apply the impulse voltage wave with specified peak and wave front time on a tested piece and reference winding (or coil) with same design alternately (or simultaneously), and then detect whether the interturn insulation of electrical machine winding (or coil) is in good condition by their damped oscillating waveform difference caused by impulse voltage
