IEC 60172:2015 specifies, in accordance with the provisions of IEC 60216-1, a method for evaluating the temperature index of enamelled wire, varnished or unvarnished with an impregnating agent, and of tape wrapped round and rectangular wire, in air at atmospheric pressure by periodically monitoring changes in response to AC proof voltage tests. This procedure does not apply to fibre-insulated wire or wire covered with tapes containing inorganic fibres. This fourth edition cancels and replaces the third edition published in 1987, Amendment 1:1997 and Amendment 2:2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: – Revision of Clause 1, Scope, to incorporate appropriate text from former Clause 2, Object; – Deletion of Clause 2, Object, by placement of its text into existing clauses; – New Clause 2, Normative references; – Revision of 5.1.1, 5.3 and 5.4 with corrections to Amendment 2 to the third edition; – Revision of Clause 7 as to clarify which specimens comply with Table 3 and Table 4; – Revision of figures with high-resolution photos and graphs. Keywords: enamelled wire, tape wrapped round and rectangular wire, AC proof voltage tests<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 50<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 52<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 54<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 55<\/td>\n | 4 Summary of procedure 5 Test specimens 5.1 Preparation 5.1.1 Enamelled round wire with a nominal conductor diameter of 0,224 mm up to and including 2,65 mm <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Figures Figure 1 \u2013 Device used to form enamelled round wire test specimen Figure 2 \u2013 Spacer Tables Table 1 \u2013 Force and number of twists for specimens <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Figure 3 \u2013 Twist forming jig Figure 4 \u2013 Test specimen set up in forming jig <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | 5.1.2 Tape wrapped round wire and enamelled or tape wrapped rectangular wire Figure 5 \u2013 Test specimen formed with loop cut Table\u00a02 \u2013 Proof voltage for round enamelled wire <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | Figure 6 \u2013 Jig for bending large magnet wire, dielectric test specimen <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | 5.2 Varnish impregnation Figure 7 \u2013 Forming jig and test specimen <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | 5.3 Notes on number of test specimens 5.4 Specimen holder 5.4.1 For specimens according to 5.1.1 Figure 8 \u2013 Specimen holder <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | 5.4.2 For specimens according to 5.1.2 6 Temperature exposure Figure 9 \u2013 Specimen holder and electrical connection fixture <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Table 3 \u2013 Recommended exposure times in days per cycle <\/td>\n<\/tr>\n | ||||||
| 64<\/td>\n | 7 Test voltage and its application 8 Calculations 8.1 Specimen failure time Table\u00a04 \u2013 Proof voltage for tape-wrapped round and for enamelled or tape-wrapped rectangular wire <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | 8.2 Time to failure 8.3 Linearity of data 8.4 Calculating and plotting thermal endurance and temperature index <\/td>\n<\/tr>\n | ||||||
| 66<\/td>\n | 9 Report Figure\u00a010 \u2013 Thermal endurance graph \u2013 Temperature index <\/td>\n<\/tr>\n | ||||||
| 67<\/td>\n | Annex A (normative) Method for calculation of the regression line <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | Table\u00a0A.1 \u2013 Commonly used test temperatures in degrees Celsius and the corresponding kelvins with its reciprocal and reciprocal squared values <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | Table\u00a0A.2 \u2013 Sample calculation <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | Figure A.1 \u2013 Plot of regression line based on sample calculation (Table\u00a0A.2) <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | Annex B (normative) Correlation coefficient <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Tracked Changes. Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires<\/b><\/p>\n |