BS EN 61857-21:2009
$102.76
Electrical insulation systems. Procedures for thermal evaluation – Specific requirements for general-purpose models. Wire-wound applications
| Published By | Publication Date | Number of Pages |
| BSI | 2009 | 22 |
IEC 61857-21:2009 describes a general-purpose model (GPM) and a tall channel alternative model (GPM-TC) which can be used for the evaluation of wire-wound electrical insulation systems (EIS) where specific electrotechnical products are not available or required. The third edition cancels and replaces the second edition published in 2004, and constitutes editorial revisions to make this standard compatible with Parts 1 and 22.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 7 | FOREWORD |
| 9 | INTRODUCTION |
| 10 | 1 Scope 2 Normative references 3 Terms and definitions |
| 11 | 4 Construction 4.1 General information Figure 1 – GPM test object |
| 12 | 4.2 Model components |
| 13 | Figure 2 – Schematic drawing of a GPM frame |
| 14 | Figure 3 – Manufacturing drawing of a GPM-TC frame |
| 15 | 4.3 Assembly of the model |
| 16 | 5 Number of test objects 6 Test procedure 6.1 General 6.2 Initial screening test |
| 17 | 6.3 Thermal endurance test Table 1 – Initial dielectric test |
| 18 | 7 End-of-life criterion Table 2 – Dielectric diagnostic test |
| 19 | 8 Analysing, reporting and classification |
| 20 | Bibliography |
