IEC 60034-15:1995 pdf download.Rotating electrical machines
1 Scope
This part of IEC 34 specifies the rated phase-to-earth impulse voltage withstand levels of rotating a.c. machines having rated voltages from 3 kV to 15 kV inclusive and incorporating form-wound stator coils, together with the test procedures and voltages to be applied to the main and interturn insulation of sample coils to prove the compliance of the machine.
2，Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 34. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 34 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 34-1: 1994, Rotating electrical machines - Part 1: Rating and performance
IEC 60-1: 1989，High-voltage test techniques 一Part 1: General definitions and test requirements
IEC 71-1: 1993, Insulation co-ordination - Part 1: Definitions, principles and rules
4 Impulse voltage withstand levels
Rated impulse voltage withstand levels for rated voltages from 3 kV to 15 kV shall be obtained by application of the formulae given in notes 2 and 4 of table 1, the values obtained being rounded off to the nearest whole number. Table 1 gives the rated impulse voltage withstand levels for some common rated voltages, together with the corresponding rated power-frequency withstand voltage (r.m.s.) according to IEC 34-1.
5.1.1 General
These tests are carried out as an indirect proof as explained in A.3.2 of annex A. The test coils shall be fully processed, including corona protection, if provided, and shall be either embedded in slots or fitted with the slot portion wrapped in earthed conducting tape or foil. The number of sample coils shall be two, unless agreed otherwise between the manu-facturer and the purchaser.
5.1.2.2 The interturn test voltage shall be generated by the damped oscillatory discharge of a capacitor. The number of capacitor discharges shall be five, unless agreed otherwise between the manufacturer and the purchaser. The front time of the first voltage peak shall be 0,2 μs with a tolerance of + 0,3 μs/ - 0,1 μs.
5.1.2.3 The voltage peak between the terminals of the sample coil shall have the values given in table 1, column 3, as appropriate, or the values obtained by application of the formula in note 4 of table 1 and rounded of to the nearest whole number.IEC 60034-15 pdf download.